23231085 - bureau of indian standards5363-5367)_07102016.pdf1 doc: mtd 4(5363) for comments only...

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‍या प‍ चालालम‍ म‍ स ा DRAFT IN WIDE CIRCULATION

रलख‍रषण‍सलमा‍/DOCUMENT DESPATCH ADVICE

एमटीडी 4/टी-14, 5, 129, 177, MTD 4/T-14, 5, 129, 177 dated 07 Oct 2016

प टव ा‍इ‍ ाउ‍‍‍ ा ‍प पवषय‍सम तउ‍ए टीडी 04

WROUGHT STEEL PRODUCTS SECTIONAL COMMITTEE, MTD 04

प) धाउप म‍इजीतमयचाग‍पवभाग‍ चाष ‍(ए टीडीसी), प‍चल‍ाखम‍वाल‍स ‍य

1) Interested Members of Metallurgical Engineering Division Council, MTDC

1)प टव ा‍इ‍ ाउ‍‍‍ ा ‍प पवषय‍सम तउ‍ए टीडी 04 प‍स ‍य

2) All Members of Wrought Steel Products Sectional Committee, MTD 04

ग)‍अ‍य‍सभी‍चल‍ाखम‍वाल‍तमपाय

3) All Others Interested

हो य/ हो या,Dear Sir/ Madam,

तम‍ममलिखउ‍रलख‍सल‍‍म‍ह: Please find enclosed the following draft standards:

रलख स या /Document No. विषय/ Title

1.रलख: एमटीडी 04 (5363) W2 अउउ‍लघपउ अ पामम इ ाउ प ला ा‍एव‍ ती‍Part 1 पोड‍फॉम ग‍ ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍एड‍राइग‍( आईएस‍513 पा साउवा‍ माीषण)

MTD 4 (5363)W2 Cold Reduced Carbon Steel Sheet and Strip Part 1 Cold

Forming and Drawing Purpose (Seventh Revison of IS 513 )

2. रलख: एमटीडी 04 (5364) W2 अउउ‍लघपउ अ ‍पामम इ ाउ‍प ‍ला ा‍एव‍ ती‍Part 2 हाई‍टममसल‍ ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍एड‍ उफस‍टील‍( आईएस‍513 पा साउवा माीषण)

MTD 4 (5364)W2 Cold Reduced Carbon Steel Sheet and Strip Part 2 High Tensile

and Multi Phase Steel (Seventh Revision of IS 513)

3. रलख: एमटीडी 04 (5365) W2 ल:ज पायम‍एव‍सालमा‍अमभ ण हउ‍उउ‍लउ इ ाउ‍प‍लट‍ ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ ा ( आईएस‍5986 पा‍ल था‍ माीषण)

MTD 4(5365) W2 Hot - Rolled Steel Flat Products for Structural Forming and

Flanging Purposes – Specification (Fourth Revision of IS 5986)

4.रलख: एमटीडी 04 (5366) W2 उउ‍लउ‍पामम‍इ ाउ‍ला ाम‍एव‍ ती‍(आईएस‍1079 पा‍साउवा‍ ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ माीषण)

MTD 4(5366) W2 Hot - Rolled Carbon Steel Sheet, Plate and Strip – Specification (Seventh Revision of IS 1079)

5. रलख: एमटीडी 04 (5367) W2 अउउ‍लम‍रयोजम‍हउ‍उउ‍लउ‍पामम इ ाउ‍प ‍ ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ ती- पवमिटट ( आईएस‍11513‍पा‍ साा‍ माीषण)

MTD 4(5367) W2 Hot - Rolled Carbon Steel Strip for Cold Rolling Purposes

– Specification (Second Revision of IS 11513)

प‍या‍ ाो‍उ‍रलख‍पा‍अवलोपम‍पा‍अ मी‍स‍ तउया‍यह‍उाउ‍हए‍भजम, कप‍यद ‍अउउ ‍यह रलख ााट‍रीय‍ ामप‍प‍ ‍ म‍‍वीपउ‍हो‍जाए, उो‍इस‍ ा‍अ ल‍पाम‍ म‍आ प‍‍यवसाय‍अथवा‍पााोाा‍ म‍‍या‍पठमाईया‍आ‍सपउी‍ह:‍। Kindly examine these draft standards and forward your views stating any difficulty which you are

likely to experience in your business or profession, if this is finally adopted as National Standard.

स‍ तउ‍प ‍अउ ‍तउचथ/ Last date for comments: 07 11 2016

स‍ तउ‍यद ‍पोई‍हो‍उो‍ ी‍द ए‍गए‍रा ‍ म‍मलख‍पा, ऊ ामलिखउ‍ उ‍ ा‍अधोह‍उाषाी‍पो‍भजम‍। Comments, if any, may please be made in the format given overleaf and mailed to the undersigned

at the above address.

ध‍यवा , Thanking you ,

भव ीय, Yours faithfully,

(ज.प. ाख) (J.K. Bakhroo)

वञातमप ‘एफ’ र ख‍(एमटीडी.)Scientist ‘F’ & H a (MTD)

Email: [email protected]; [email protected]

सल‍‍म ऊ ामलिखउ /Encl: As above

mailto:[email protected]

1

Doc: MTD 4(5363)

FOR COMMENTS ONLY

Draft Indian Standard

COLD REDUCED CARBON STEEL

SHEET AND STRIP

PART 1 COLD FORMING AND DRAWING PURPOSE

(SEVENTH REVISION OF IS 513)

Not to be reproduced without the permission of BIS Last date for received of

or used as STANDARD comments 07 November 2016

_________________________________________________________________________________

FOREWORD

With the constant requirement of greater, stringent and varied requirements for steel sheets and strips

for automobile industry and engineering applications, many specifications were made. An endeavour

is made by Bureau of Indian Standards to identify, summarize and create a new standard. An attempt

is made to cover all such requirements of Automobile and Engineering application under a single

standard. However, interested parties as per their requirement may apply more stringent requirement

against any clause in this standard or specify other characteristics not covered by this standard.

In the present version following modifications are made:

a) New designations and grades are added

b) Existing standard is divided into two parts, based on the strength level

c) Correlation of old designation with new designations and grades has been given for

information (Annex A)

Assistance has been derived from the following.

ISO 3574 - Cold reduced carbon steel sheet for commercial and drawing qualities

EN 10268 - Cold rolled steel flat products with high yield strength for cold forming

JFS A 2001 - Cold-rolled steel sheet and strip for automobile use

JIS G 3135- Cold reduced high strength steel sheet and strip with improved formability for

automobile structural uses

For the purpose of deciding whether a particular requirement of this standard is complied with the

final value, observed or calculated, expressing the result of a test or analysis shall be rounded off in

accordance with IS2:1960 ―Rules for rounding off numerical values (revised)’. The number of significant places retained in the rounded off value should be the same as that of the specified value

in this standard.

1 SCOPE

This standard covers the requirements of cold reduced carbon steel sheets and strips for cold forming

and drawing purposeand where the surface is of prime importance. It covers sheets and strips upto

4.0 mm thick both in coil form and cut lengths.

2

2 REFERENCES

The following standards contain provisions which through in this text, constitute provisions of this

standard. At the time of publication, the editions indicated were valid. All standards are subject to

revision and parties to agreements based on this standard are encouraged to investigate the possibility

of applying the most recent editions of the standards indicated below:

IS No Title

IS 228(Relevant

Parts) Method for chemical analysis for steel

IS 1501 : 2013 Method for Vickers Hardness Test for Metallic Materials (Part 1-4)

IS 1586:2012 Method for Rockwell hardness test for metallic material (Part 1-3)

IS 1599:2012 Metallic Materials - Bend Test

IS 1608:2005 Metallic material – Tensile testing at ambient temperature (third

revision)

IS 8910:2010 General Technical delivery conditions of steel and steel products

IS 10175:2012 Metallic Materials-Sheet And Strip-Erichsen Cupping Test

IS 11999:2007 Method for determination of plastic strain ratio ‘r’ for sheet metals

IS 15756:2007 Metallic Materials – Sheet and strip- Determination of tensile strain

hardening exponent

IS/ISO 16162:2012 Cold-Rolled Steel Sheet Products - Dimensional And Shape

Tolerances ( First Revision )

IS: 1956:2006 Glossary of terms relating to Iron and steel Part-4 Steel sheet and

strip

IS 15262:2002 Geometrical Product Specifications (GPS) - Surface Texture: Profile

Method - Terms, Definitions and Surface Texture Parameters

3 CLASSIFICATION OF GRADES

Sheets and strips shall be classified as per the following groups and designated as per the

Table 1.

3.1 Cold Rolled Full Hard

Cold rolled full hard steel strips, which can be used in the production of cold rolled annealed

steel/Galvanized steel/Galvannelead steel/any other process/directly used in general

engineering purpose.

3.2 General Purpose (CR)

Steels which are used in general engineering applications where light bending or forming is

required.

3.3 Drawing Quality (C,D,E,F,G)

Mild steelswhich are used for the purpose of drawing, where as per the grade, light to critical

drawing applications are involved.

3

3.4 Interstitial Free-High Strength steel (P)

Interstitial free steels having excellent drawing capabilities for cold forming applicability.

Strengthening by solid solution hardening.

3.5 Bake Hardening (B)

Steels that exhibit increase in proof stress following paint baking treatment. Steel exhibit

good drawing capabilities before forming and increase in strength after paint baking process

for dent resistant applications.

3.6 Re-Phosphorized (R) Steel exhibit good impact and fatigue strengths. Steels that contain phosphorus to achieve the

required strength.

3.7 C,Mn Steel (W)

Steel exhibit high strengths with relatively lower yield stress. Steel that is strengthened by

the addition of Carbon and Manganese, to achieve the required strength.(Minimum tensile

strength less than or equal 440 MPa).

4 SUPPLY OF MATERIAL

4.1General requirements relating to the supply of cold rolled carbon steel sheets and strip

shall conform to IS 8910

4.2Sheets and strips may be supplied either with mill or trimmed edges.

4.3Sheets and strips of CR1 may be supplied in any of following tempers. Sheets and strips

of grades other than CR1 shall be supplied in annealed-skin passed or, as agreed between

manufacturer and purchaser.

Temper

Designation

Temper Processing

1/2 H Half Hard Produced by cold rolling followed by annealing

and further cold rolling to give strip of

intermediate hardness

1/4 H Quarter

Hard

-do-

1/8 H 1/8 Hard -do-

SP Skin Passed Produced by light cold rolling after annealing

A Annealed Produced by a final annealing process

For specific applications, sheets and strips may also be supplied in any other temper

conditions subject to agreement between manufacturer and purchaser. For such temper

grades and as annealed conditions, mechanical properties shall be as agreed between


4

5 NON AGEING CHARACTERISTICS

5.1The manufacturer shall guarantee the absence of stretcher strains on being cold worked in

the case of non-ageing quality with a non –ageing guarantee for six months from the date of

manufacture ( Date of skin pass), when stored at room temperature.

5.2The manufacturer shall guarantee the absence of stretcher strains on being cold worked in

the case of Delayed-ageing quality with a non –ageing guarantee for three months from the

date of manufacture ( Date of skin pass), when stored at room temperature.

5.3Non ageing characteristics of sheets and strips shall be as per Table 2.

6 MANUFACTURE

6.1The method of manufacture of steel and subsequent processing for production of steel for

sheets and strips shall be left at the discretion of the manufacturer or as agreed between


6.2Sheets and strips shall be supplied rimmed, semi-killed or fully killed as agreed between

the manufacturer and purchaser.Grades which are supplied in delayed ageing and Non

ageing guarantee shall be supplied only in fully aluminium killed or in a fully stabilized

condition

7 CHEMICAL COMPOSITION

7.1The ladle analysis of steel, when carried out either by the methods specified in relevant

parts of IS 228 or any other established international instrumental/chemical method, shall be

as given in Table 3. In case of any dispute, the procedure given in relevant parts of IS 228

shall be the referee method.

7.2Alternatively, the method specified in relevant ISO standard may be used.

7.3 Product Analysis

Permissible variation in the case of product analysis from the limits specified in Table 3 shall

be as given in Table 4.

8 MECHANICAL AND PHYSICAL PROPERTIES

8.1 Tensile Test

a) Tensile shall be carried out only, if specified by the purchaser;

b) Tensile test shall be carried out in accordance with IS 1608/ISO 6892;

c) When specified, tests shall be carried out in accordance with the relevant Indian

standards of test methods and Mechanical properties shall conform to the

requirements specified in Table 5A , 5B and 5C;

d) Tensile test values apply to the direction mentioned in Table 5A , 5B and 5C.

Strips having a width of 250 mm and below shall be tested longitudinally;

e) The yield stress values apply to the 0.2 percent proof stress, if the yield stress is

not clearly distinctive, otherwise the values apply to the lower yield stress; and

f) The values specified in Table 5A,5B and 5C are applicable as per the non ageing

guarantee mentioned in Table 2.

5

8.2 Cupping Test

a) Cupping test shall be applicable only for sheets and strips ofCR2, CR3, CR4

grades having thickness from 0.5 mm upto 2.0 mm;

b) Cupping test shall be carried out in accordance with IS 10175, and the minimum

Erichson cupping test values shall be as given in Fig.1

Note: The shape of the cup fracture may be as mutually agreed between the


c) Cupping test is not a mandatory requirement for this standard. The same can be

applied with mutual agreement between manufacturer and purchaser.

8.3 Hardness Test

Cold rolled sheets and strips shall conform to the Hardness requirements specified in Table

6, when tested in accordance with IS 1586. However, by way of departure from these

standards, a visible deformation on the back side of the specimen is permitted. The values

determined in this way shall be identified by using symbols HRBm and HR30Tm, so as to

differentiate these from the hardness values determined on thicker products (Which are not

allowed to exhibit a visible deformation on the back side of the specimen). If agreed between

the manufacturer and purchaser, hardness can be checked by using IS 1501: Method for

Vickers hardness test for metallic materialand Resultsas agreed between manufacturer and

Purchaser.

8.4 Bend Test

a) Bend Test shall be carried out in accordance with IS 1599;

b) The angle of bend and the internal diameter for the different grades of material

shall be as given in Table 7;

c) The axis of the bend shall be in the direction of rolling. The test pieces shall be

deemed to have passed the test, if the outer convex surface is free from cracks; and

d) Bend test is not a mandatory requirement for this standard. The same can be

applied with mutual agreement between manufacturer and purchaser.

8.5 Plastic Strain Ratio (R bar/r-90)

a) The plastic strain ratio is an index of drawability (r bar/r-90), shall be applicable

only to thickness between 0.50 mm to 2.00 mm. For thickness more than 1.00 mm

, r-bar/r-90 value is reduced by 0.10 and if required, for thickness more than

2.0mm, r-bar/r-90 value to be reduced by 0.20; and

b) The plastic strain ratio shall be checked in accordance with IS 11999 and results

shall conform to as given in Table 5A, 5B and 5C.

8.6 Tensile Strain Hardening Component (n value)

a) The tensile strain hardening is an index of the stretch-ability (n-value/n-90), shall

be applicable only to thickness between 0.50 mm and 2.00 mm. If required, for

thicknessmore than 2.00 mm, the n-value/n-90 is reduced by 0.02; and

b) The tensile strain hardening component shall be checked in accordance with IS

15756

andresults shall conform to as given in Table 5A , 5B and 5C.

6

8.7 Bake Hardening Index –(BH)

Bake hardening index shall be tested as per Annex B and minimum BH value shall as given

inTable 5B and 5C.

8.8 Retest

If a test does not give the specified results, two additional tests shall be carried out at random

on the same lot. Both retests shall conform to the requirements of this standard; otherwise,

individual test on each coil, (including any bundle of sheets generated from a single coil)

shall meet the requirement otherwise the individual lot shall be rejected.

9 SURFACE FINISH

9.1 Cold Reduced Steel Sheetand Strip

This product is normally supplied skin passed (see9.2), but may be supplied annealed last

(that is without skin pass), if specified by the purchaser before placing the order.

9.2 Skin Pass

The purpose of skin passing is one or more the following:

a) To temporarily minimize the appearance of coil breaks, stretcher strains (Luder

lines) or fluting during fabrication of finished parts;

b) To obtain the required surface finish suitable for ordinary decorative painting; and

c) To control the shape.

Some increase in hardness and some loss in ductility will result from skin passing.

9.3 Strain Ageing

Cold reduced sheet and strip in qualities CR1, CR2, CR3 supplied in skin-passed condition

tends to strain age and this may lead to the following:

a) Surface markings from stretcher strains (Luder lines) or fluting when the steel is

formed; and

b) Deterioration in ductility.

Because of these factors, it is essential that the period between final processing at the mill

and fabrication be kept to minimum. Rotation of stock, by using oldest material first, is

important. Stocking of such Sheet and strip for extended periods of time should be avoided;

for optimum performance the period should not exceed six weeks.

For skin passed sheet and strip in qualities CR1, CR2, CR3and with due regard to foregoing

precautions, reasonable freedom can be achieved by effective roller levelling immediately

prior to fabrication at the purchaser’s plant. Freedom from stretcher strain and fluting for a

period of six months or three months can be achieved by the supply of skin passed non-

ageing steel or delayed ageing steel respectively. Grades of non ageing quality shall be

7

specified in such cases, where Luder’s lines are not acceptable and where roller levelling is not possible.

9.4 Surface Condition

The surface condition of CR0and CR1 grade should be that normally obtained in a cold rolled

product. Grades of other quality (that is other than CR0 and CR1) are supplied either of the

surface qualities A or B.

a) Surface Quality A (Un exposed) - Imperfections such as pores, slight

imperfections, small marks, minor scratches and slight colouring, which do not

affect the formability or the application of surface coatings are permitted;

b) Surface Quality B (Exposed) - The better surface shall be free of imperfections,

which might affect the uniform appearance of quality coating. The other surface

shall at least conform to surface quality A;

c) Unless otherwise agreed, a single surface of the product shall comply with the

specified requirements. On Mutual agreement between manufacturer and

purchaser, any one of the applicable surface or both the surfaces (For Strip –

Outside/ Inside surface, For Sheet – Top/Bottom Surface) shall comply with the

requirements; and

d) The other surface shall be such that during subsequent treatment it does not have a

deleterious effect on the better surface.

9.5 Surface Finish

a) Cold reduced steel sheet and strip may be supplied in a Bright finish and matt

finsh, dull in appearance, which is suitable for ordinary decorative painting but is

not recommended for electro plating. Surface roughness may be given subject to

mutual agreement between the manufacturer and the purchaser;

b) When cold reduced sheet and strip is deformed during fabrication, localized areas

may roughen to some degree and such affected portions of the part may require

hand finishing to prepare the surface for the intended application; and

c) Designation of surface finish shall be as per Table 8

9.6 Oiling

As a deterrent to rusting, a coating of oil is usually applied to the product. The oil is not

intended as a drawing or forming lubricant and should be easily removable with degreasing

chemicals. The product may be ordered not oiled, if required, in which case, the supplier has

no responsibility, if oxidation occurs. For type of oiling, Table 9 can be referred (Reference

purpose only).

10 FREEDOM FROM DEFECTS

10.1The finished sheets and strips shall be reasonably free from harmful defects such as

scale, rust, blisters, laminations, pitting, porosity, cracked or torn edges or any other defects

which are harmful to the intended use

10.2The degree or amount of surface defects in a strip may be expected to be more than in cut

lengths because of the impossibility of rejectingportions of a strip. The purchaser should take

8

this into account and the percentage of admissible defects may be agreed at the time of the

enquiry and order.

10.3The sheets shall be reasonably flat and edges cleanly sheared and squared to the specified

dimensions

11 DIMESNIONS AND TOLERANCES

11.1Unless and other wise agreed to between manufacturer and the purchaser, standard

dimensions of cold rolled sheets and strips shall be as given below:

Thickness, mm = 0.08,0.10, 0.12, 0.14, 0.16, 0.18, 0.20, 0.22, 0.25, 0.28, 0.30 ,0.32,

0.35,0.40, 0.45, 0.50 ,0.55 ,0.63, 0.70 ,0.80 ,0.90 ,1.00 ,1.20 ,1.25 ,1.40 ,1.50 ,1.60

,1.80 and 2.00

The following are the preferred thickness for sheets and strips above 2.00 mm:

Thickness, mm= 2.50 mm, 2.65 mm, 3.00 mm, 3.25 mm, 3.50 mm, 4.00 mm.

11.2Dimensional and shape tolerances applicable to cold rolled sheets and strip shall be as

given in IS/ISO 16162. Stricter dimensional tolerances can be agreed between manufacturer

and purchaser.

11.3For Untrimmed edges, width tolerances shall be +20/-0 mm and for edges which are

trimmed before cold rolled, width tolerances shall be +7/-0 mm. For Edges trimmed after

cold rolling and annealing, width tolerances shall be as per IS/ISO 16162:2012.

12 SAMPLING AND TESTS

12.1One representative sample from a strip or a lot of sheets shall be taken for tensile testing.

A lot consists of 50 tonnes or less of sheets or strips of the same quality rolled to same

thickness and processed in same condition. If the lot consists of more than one heat, samples

from each heat shall be tested.

12.2For cupping, hardness and bend tests, one sample from each lot of 50 tonnes of same heat

or part thereof or one sample from each coil shall be taken.

12.3The specimens shall not undergo any treatment on either surface before testing. In case of

strips, samples shall be taken from the beginning or end of the strip.

12.4The centre of each test piece shall be at a quarter widths. When it is not feasible,

however the sampling should be made as close to the aforementioned position as possible

13 MARKING

13.1 Marking

The following shall be legibly marked or printed on a sticker attached on the top of each

bundle of package of sheets /on a tag attached to each coil:

a) Manufacturer’s name or trade mark;

b) Quality designation and grade;

c) Product dimensions;

9

d) Cast or identification mark by which the sheet or strip may be traced to cast or

casts from which they were made; and

e) Mass/Net weight.

13.2 BIS Certification Marking

The material may also be marked with the standard mark.

13.2.1The use of standard mark is governed by the provisions of Bureau of Indian standards

Act 1986 and the rules and regulations made there under. The details of conditions under

which the licence for the use of standard mark may be granted to manufacturers or producers

may be obtained from the bureau of Indian standards.

13.3 Packing

a) Each sheet shall be treated on both sides with non-hardening type rust

preventive oil, which can be easily washed with aqueous alkali solution;

b) Sheets and strips shall preferably be supplied in bundles or packages not more

than 3 tonnes or as agreed to between the purchaser and the manufacturer.

c) Sheets and strips shall be securely packed in water-resistant material and

cover all over with steel envelope and securely tied round with steel straps and

preferably with wooden battens underneath to prevent the sheets from rusting

and damage during transit.

Table 1 Designation and Grades

Designation (Quality) Grade Available Product Range (mm)

Cold Rolled (Full Hard) CR0 0.08-4.00

General Purpose

CR1 0.08-4.00

CR2 0.20-4.00

CR3 0.20-4.00

CR4 0.30-4.00

CR5 0.30-4.00

Drawing Quality

ISC270C 0.20-3.20

ISC270D 0.20-3.20

ISC270E 0.20-3.20

ISC270F 0.40-3.20

ISC260G 0.40-2.30

Interstitial Free-High Strength steel

ISC340P 0.40-2.30

ISC370P 0.40-2.30

ISC390P 0.40-2.30

ISC440P 0.40-2.30

Bake Hardening

ISC270B 0.40-2.30

ISC300B 0.40-2.30

ISC320B 0.40-2.30

ISC340B 0.40-2.30

10

ISC360B 0.40-2.30

ISC390B 0.40-2.30

ISC440B 0.40-2.30

Re-Phosphorized

ISC280R 0.40-3.00

ISC320R 0.40-3.00

ISC360R 0.40-3.00

ISC400R 0.40-3.00

C,Mn Steel

ISC340W 0.40-3.00

ISC370W 0.40-3.00

ISC390W 0.40-3.00

ISC440W 0.40-3.00

NOTES

1 For any thickness greater than or less than the mentioned range, the same can be produced as mutually agreed between manufacturer

and purchaser. Acceptance criteria for the range out of available product range shall be as agreed between Purchaser and manufacturer.

2For General Purpose Designation, grade qualities are as follows CR1- Commercial, CR2-Drawing, CR3-Deep Drawing, CR4-Extra Deep drawing,

CR5– Extra Deep drawing (Stabilized Interstitial Free).

3 Nomenclature of grade is explained in AnnexC.

11

Table 2Non Ageing Characteristics

Grade Non Ageing Characteristics

CR0 --

CR1 --

CR2 8 days

CR3 8 days

CR4 Non Ageing

CR5 Non Ageing

ISC270C --

ISC270D Delayed Ageing

ISC270E Delayed Ageing

ISC270F Non Ageing

ISC260G Non Ageing

ISC340P Non Ageing

ISC370P Non Ageing

ISC390P Non Ageing

ISC440P Non Ageing

ISC270B Delayed Ageing







ISC280R --

ISC320R --

ISC360R --

ISC390R --

ISC340W --

ISC370W --

ISC390W --

ISC440W --

NOTE:

a) (--) → Non ageing guarantee is not applicable

b) For grades where non ageing guarantee is not Applicable, type of non-ageing characteristics can be mutually agreed between

Manufacturer and Purchaser, before placing the order.

12

Table 3Chemical Composition

Grade C

(% Max)

Mn

(% Max)

S

(% Max)

P

(% Max)

CR0 0.35 4.00 0.035 0.05*

CR1 0.15 1.00 0.035 0.08

CR2 0.12 0.50 0.035 0.040

CR3 0.10 0.45 0.03 0.025

CR4 0.08 0.45 0.03 0.020

CR5 0.06 0.25 0.02 0.020

ISC270C 0.12 0.50 0.035 0.04

ISC270D 0.10 0.45 0.030 0.025

ISC270E 0.08 0.40 0.030 0.020

ISC270F 0.06 0.25 0.020 0.020

ISC260G 0.01 0.20 0.020 0.020

ISC340P 0.01 0.80 0.025 0.08

ISC370P 0.01 1.00 0.025 0.10

ISC390P 0.01 1.60 0.025 0.10

ISC440P 0.01 1.60 0.025 0.12

ISC270B 0.04 0.80 0.020 0.08

ISC300B 0.04 0.80 0.020 0.08

ISC320B 0.04 0.80 0.020 0.08

ISC340B 0.04 1.00 0.020 0.10

ISC360B 0.04 1.20 0.020 0.10

ISC390B 0.04 1.20 0.020 0.12

ISC440B 0.04 1.40 0.020 0.12

ISC280R 0.10 0.60 0.030 0.10

ISC320R 0.10 0.80 0.030 0.10

ISC360R 0.12 1.00 0.030 0.10

ISC400R 0.12 1.20 0.030 0.10

ISC340W 0.12 0.90 0.030 0.05

ISC370W 0.15 1.30 0.030 0.05

ISC390W 0.20 1.50 0.030 0.05

ISC440W 0.20 1.70 0.030 0.05

Notes:

a) Restricted chemistry can be mutually agreed between purchaser and manufacturer

b) When the steel is Aluminium killed, the total Aluminium content shall not be less than 0.02 percent. When the steel is silicon

killed, the silicon content shall not be less than 0.10 percent. When the steel is Aluminium silicon killed, the silicon content

shall not be less than 0.03 percent and total Aluminium content shall not be less than 0.01 percent. (Note: If mutually agreed

between purchaser and manufacturer, for aluminium killed steel, aluminium content can be less than 0.02 %)

c) For grades where Non Ageing characteristics are defined, Nitrogen content shall be 0.007 % Maximum. For grades, where

non Ageing characteristics are not defined, Nitrogen content shall be 0.012 % Maximum. This shall be ensured by the

manufacturer by occasional check analysis.

d) The steel can be made with micro alloying elements like Chromium, Nickel,Niobium, Vanadium, Titanium, Molybdenum,

Boron, Calcium and others, eitheradded individually or in combination,. However in case of boron, the limit shall be 0.006

% Maximum.

e) *Phosphorus limit of 0.12 % Maximum can be added and in such cases, carbon content shall be limited to 0.15 % Maximum.

13

Table 4 Variation in Product Analysis

Element Specified Chemical Composition

Limit, Max

Variation over Specified Limit Percent,

Max

(1) (2) (3)

Carbon ≤0.15

>0.15

0.02

0.03

Manganese

≤0.60

>0.60 to ≤1.15

>1.15

0.03

0.04

0.05

Sulphur ≤ 0.05 0.005

Phosphorus ≤0.05

>0.05

0.005

0.010

Silicon ≤0.60

>0.60

0.03

0.06

Micro Alloy - Subject to negotiation

NOTE — For carbon content less than 0.10 percent, variation over specified limit can be mutually agreed between

purchaser and manufacturer.

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Table 5A Mechanical Properties at Room Temperature in as Delivered Condition for Annealed&Skin Passed Sheets and strips

(Cut lengths and Coils)

Designation Grade

Yield Point or

Proof Stress

Mpa (Max)

Minimum Tensile

Strength

MPa (Max)

Minimum Elongation Mean Plastic

strain ratio

r-Bar

Tensile strain

hardening

component

n-Value

Test Direction Gauge Length- 80

mm

Gauge Length- 50

mm

General Purpose

CR1 280 410 27 28 -- -- T

CR2 240 370 30 31 -- -- T

CR3 220 350 34 35 1.3 min 0.16 min T

CR4 210 350 36 37 1.4 min 0.19 min T

CR5 190 350 38 40 1.7 min 0.22 min T

Notes for Table 5A:--

1. 1 N/mm2 = 1 MPa

2. Stricter Mechanical properties requirement may be agreed between Manufacturer and Purchaser, before placing the order.

3. Mechanical properties apply only to skin-passed products

4. The values of yield stress are the 0.2 % proof stress for products which do not represent a marked yield point and the lower yield stress for the others

5. Test Piece Direction – L : Rolling Direction, Test Piece Direction – T: Perpendicular to rolling direction

6. For Thickness upto and less than 0.6 mm, elongation values in the table 5A shall be reduced by 1

7. r-Bar and n-Value are only applicable to thickness greater than 0.5 mm. For thickness more than 1.00 mm , r-bar/r-90 value is reduced by 0.10.For Thickness greater than 2.0 mm, r-

Bar value is reduced by 0.2 and n value reduced by 0.02

8. Mechanical properties are not generally tested on CR1 Grade and values mentioned are for information only

9. r-Bar and n-Values may be modified or excluded from this requirement, by agreement between manufacturer and purchaser.

10. Grade CR1 May be supplied in any of the temper grades as mentioned and mechanical properties (For temper other than Annealed and Skin passed) may not apply and shall be as per

mutual agreement between Manufacturer and purchaser before placing of an order.

11. Mechanical properties not applicable for Grade CR0 – Which is supplied in as cold rolled condition

12. (--) → Notrequired.

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Table 5BMechanical Properties at Room Temperature in as Delivered Condition for Annealed andSkin Passed Sheets and Strips


Grade

Minimum

Tensile

Strength

MPa

Yield Point or Proof Stress

Mpa

Elongation %

Gauge Length- 50 mm Amount

of Bake

Hardening

BH

MPa

Test

Piece

Direction

Mean

Plastic

strain

ratio

r-Bar

Strain

hardening

component

n-Value

Thickness, T, mm Thickness, T, mm

T<

0.40

0.40≤

T

<0.80

0.80≤

T

<1.00

T

≥1.00

T<

0.40

0.40≤

T

<0.60

0.60≤

T

<0.80

0.80≤

T

<1.00

1.00≤

T

<1.20

1.20≤

T

<1.60

1.60≤

T

<2.00

2.00≤

T

<2.50

T≥

2.50

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19)

ISC270C 270 155-275 145-265 135-255 125-245 37-46 37-46 38-47 39-48 40-49 41-50 42-53 43-55 44-57 -- L -- --

ISC270D 270 -- 135-225 125-215 115-205 40-49 40-49 41-50 42-51 43-52 44-53 45-55 46-57 47-59 -- L ≥1.2* ≥0.15*

ISC270E 270 -- 130-205 120-195 110-185 42-50 42-50 43-51 44-52 45-53 46-54 47-56 48-58 49-60 -- L ≥1.4* ≥0.18*

ISC270F 270 -- 120-185 110-175 100-165 44-52 44-52 45-53 46-54 47-55 48-56 49-58 50-60 -- -- L ≥1.6 ≥0.20

ISC260G 260 -- 110-175 100-165 90-165 46-54 46-54 47-55 48-56 49-57 50-58 51-60 52-62 -- -- L ≥1.8 ≥0.22

ISC340P 340 -- 165-255 155-245 145-235 -- 35-45 36-46 37-47 38-48 39-49 ≥40 -- -- T ≥1.4 ≥0.20

ISC370P 370 -- 175-265 165-255 155-245 -- 33-43 34-44 35-45 36-46 37-47 ≥38 -- -- T ≥1.4 ≥0.18

ISC390P 390 -- 205-305 195-295 185-285 -- 31-42 32-43 33-44 34-45 35-46 ≥36 -- -- T ≥1.4 ≥0.16

ISC440P 440 -- 245-355 235-345 225-335 -- 28-39 29-40 30-41 31-42 32-43 ≥33 -- -- T ≥1.3 ≥0.15

ISC270B 270 -- 135-225 125-215 115-205 -- 40-50 41-51 42-52 43-53 44-54 ≥45 -- ≥30 L ≥1.4 ≥0.18

ISC340B 340 -- 185-285 175-275 165-265 -- 34-44 35-45 36-46 37-47 38-48 ≥39 -- ≥30 T ≥1.1 ≥0.15

ISC440B 440 -- 265-375 255-365 245-355 -- 26-37 27-38 28-39 29-40 30-41 ≥30 -- ≥30 T ≥1.0 ≥0.12

ISC340W 340 -- 185-285 175-275 165-265 -- 33-43 34-44 35-45 36-46 37-47 ≥38 -- T -- --

ISC370W 370 -- 205-305 195-295 185-285 -- 30-40 31-41 32-42 33-43 34-44 ≥35 -- T -- --

ISC390W 390 -- 245-355 235-345 225-335 -- 29-40 30-41 31-42 32-43 33-44 ≥34 -- T -- --

ISC440W 440 -- 285-390 275-380 265-370 -- 26-38 27-39 28-40 29-41 30-42 ≥31 -- T -- --

Table 5C Mechanical Properties at Room Temperature in as Delivered Condition for Annealedand Skin Passed Sheets and Strips


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16

Grade

Minimum Tensile

Strength

MPa


MPa

Elongation %

Gauge Length- 80 mm

Amount of Bake

Hardening

MPa

BH

Test Piece

Direction

Plastic strain

ratio

(r-90)

Strain hardening

component

(n-90)


T≤

0.50

0.50<

T

≤0.70

T>

0.70

T≤

0.50

0.50<

T

≤0.70

T>

0.70

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)

ISC300B 300 180-250 180-230 180-230 ≥30 ≥32 ≥34 ≥35 T ≥1.6 ≥0.17

ISC320B 320 220-290 220-270 220-270 ≥28 ≥30 ≥32 ≥35 T ≥1.5 ≥0.16

ISC360B 360 260-340 260-320 260-320 ≥25 ≥27 ≥29 ≥35 T -- --

ISC390B 400 300-380 300-360 300-360 ≥22 ≥24 ≥26 ≥35 T -- --

ISC280R 280 180-250 180-230 180-230 ≥30 ≥32 ≥34 -- T -- --

ISC320R 320 220-290 220-270 220-270 ≥28 ≥30 ≥32 -- T -- --

ISC360R 360 260-340 260-320 260-320 ≥25 ≥27 ≥29 -- T -- --

ISC400R 400 300-380 300-360 300-360 ≥22 ≥24 ≥26 -- T -- --

Notes for Table 5B & 5C:--

1. 1 N/mm2 = 1 MPa = 0.1020 kgf/mm2

2. Stricter Mechanical properties requirement may be agreed between Manufacturer and Purchaser, before placing the order.

3. Mechanical properties apply only to skin-passed products

4. The values of yield stress are the 0.2 % proof stress for products which do not represent a marked yield point and the lower yield stress for the others

5. r-Bar/r-90 and n-Value/n-90 are only applicable to thickness greater than 0.5 mm. For thickness more than 1.00 mm , r-bar/r-90 value is reduced by 0.10For Thickness greater than 2.0

mm, r-Bar/r-90 value is reduced by 0.2 and n value/n-90 reduced by 0.02

6. Test Piece Direction – L : Rolling Direction, Test Piece Direction – T: Perpendicular to rolling direction

7. Any Additional test may be carried out as per mutual agreement between Manufacturer and Purchaser

8. *- Not a mandatory requirement and it can be applied only on mutual agreement.

9. Choice of Properties: Properties are applicable as per Thickness range provided in Table 5B & 5C. If mutually agreed between Manufacturer and purchaser and properties range

(Yield Point or Proof Stress and Elongation ) is not required as per thickness range, then Minimum and Maximum values of the respective grade (Yield Point or Proof Stress and

Elongation ), shall be considered as Limits of Yield point or Proof stress and elongation. For Ex: In Grade ISC270C , Properties are not required as per thickness range, then Limits of

Yield Point or Proof Stress:125-275 MPa and Elongation : 37-57 %.

10. (--) → Not required.

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Table 6Hardness of Grade at Room Temperature

Grade Temper Hardness (HRB)

Min Max

(1) (2) (3) (4)

CR0 Cold Rolled Full Hard 85 −

CR1 Half Hard(1/2H) 75 90

CR1 Quarter Hard(1/4H) 60 80

CR1 1/8 Hard(1/8H) 50 71

CR1 Annealed (A) Dead Soft − 68

CR1 Skin passed − 70 NOTE —Stricter Hardness ranges can be as agreed between manufacturer and Purchaser.

Table 7Bend Test

Minimum Tensile Strength (MPa) Bend Angle Bend Radius

(1) (2) (3)

270 1800 Close

340 1800 Close

370 1800 Close

390 1800 Close

440 1800 Close

NOTE —For grades, where minimum tensile requirement is not mentioned in the above table, nearest minimum tensile strength value can be applied.

For Grade CR1, angle of bend degree is 1800 and bend radius is t (t=thickness)

Table 8 Surface Finish

Surface Finish Class Surface Finish Designation Surface Roughness (µm)

(1) (2) (3)

Dull Finish D 0.50≤Ra≤2.00

C 0.50≤Ra≤1.20

Bright Finish B Ra≤0.60µm

NOTES

1 Surface roughness Ra is the average roughness.

2 Restricted range of surface roughness can be agreed between manufacturer and Purchaser.

3 Unless and other wise mentioned, general condition of surface shall be Dull Finish with surface designation D.

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Table 9 Type of Oiling

Type of Oiling Description

(1) (2) (3)

Normal Rust preventive Oil Commonly used for steel strip and sheet for rust

prevention

Special Rust

preventive Oil

High Lubrication rust

preventive oil For rust prevention and better frictional properties during

press work Solid lubricant

No Oiling Surface will be dry and prone to oxidation

NOTE —Above table for the purpose of reference only.

Fig .1- Minimum Erichsen Values

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ANNEX A

(Foreword)

CORRELATION OF OLD AND NEW GRADES/DESIGNATIONS

Old Designation New Designation

(1) (2) (3) (4)

Designation Name Designation Grade

CR0 Hard Cold Rolled (Full

Hard) CR0

CR1 Commercial General Purpose-

Commercial CR1

CR2 Drawing

General Purpose-

Drawing CR2

CR3 Deep Drawing

General Purpose-

Deep Drawing CR3

CR4 Extra Deep Drawing

General Purpose-

Extra Deep

Drawing

CR4

CR5

Extra Deep

Drawing(Stabilized Interstitial

Free)

General Purpose-

Extra Deep

Drawing(Stabilized

Interstitial Free)

CR5

CR5-IF340

Extra Deep


Free)

Interstitial Free-

High Strength steel ISC340P

CR5-IF390

Extra Deep


Free)

Interstitial Free-


CR5-IF440

Extra Deep


Free)

Interstitial Free-


CR5-BH270

Extra Deep


Free)

Bake Hardening ISC270B

CR5-BH320

Extra Deep


Free)


CR5-BH370

Extra Deep


Free)


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20

ANNEX B

(Clause 8.7)

BAKE HARDENING TEST

The bake hardening index (BH) is the increase in the yield point that is found in the Bake hardening test

carried out.Bake hardening of steel is achieved during the paint baking treatment. The test procedure for the

determination of bake hardening Index is as follows:

a. Test specimen shall be collected from annealed and skin passed material, which is not supposed to

exhibit yield point phenomenon during tensile testing, in the direction mentioned as per Table 5B&

5C. Tensile specimen to be prepared as per IS 1608

b. Parallel portion area of the test piece shall noted be as A0.

c. The test specimen shall be strained to 2 percent tensile elongation. The corresponding force shall be

noted as N1.

d. The specimen shall beunloaded and heated for 20 minutes at a temperature of 1700C.

e. After the heat treatment, the test specimen shall be subjected to tensile testing again. The sharp yield

point is expected to appear along with the yield drop phenomenon. The force corresponding to the

upper yield point shall be noted as N2

f. The BH value calculationshall be obtained as BH = (N2- N1)/A0

g. BH Value calculation is schematically represented in Figure 2.A &2.B.

Elongation

Force

N1

2%

Fig.2.A. Preliminary strain loading

Elongation

Force

N1

N2

Fig.2.B. After heat treatment

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21

ANNEX C

(Table 1 Note 3)

NOMENCLATURE OF GRADE

ISC340P

Designation (Quality)

Minimum Tensile Strength

Cold Rolled Steel

Indian Standard

1

Doc: MTD 4(5364)

FOR COMMENTS ONLY


COLD REDUCED CARBON STEEL

SHEET AND STRIP

Part 2High Tensile And Multiphase Steel

(Second Revision of IS 513)

ICS:

Not to be reproduced without the permission of Last date for receipt of

BIS or used as a Standard comments is:

_________________________________________________________________________________

FOREWORD

With the constant requirement of greater, stringent and varied requirements for steel sheets and strips

for automobile industry and engineering applications, many specifications were made. An endeavour

is made by Bureau of Indian Standards to identify, summarize and create a new standard. An attempt

is made to cover all such requirements of Automobile and Engineering application under a single

standard. However, interested parties as per their requirement may apply more stringent requirement

against any clause in this standard or specify other characteristics not covered by this standard.

In the present version following modifications are made:

a) New designations and grades are added; and

b) Existing standard is divided into two parts, based on the strength level.

Assistance has been derived from the following:

EN 10268 - Cold rolled steel flat products with high yield strength for cold forming

a) EN 10338 - Hot rolled and cold rolled non-coated products of multiphase steels for cold

forming - Technical delivery conditions

b) JFS A 2001 - Cold-rolled steel sheet and strip for automobile use

c) JIS G 3135- Cold reduced high strength steel sheet and strip with improved formability for

automobile structural uses.

For the purpose of deciding whether a particular requirement of this standard is complied with the

final value, observed or calculated, expressing the result of a test or analysis shall be rounded off in

accordance with IS2:1960 ―Rules for rounding off numerical values (revised)’. The number of significant places retained in the rounded off value should be the same as that of the specified value

in this standard.

2

1 SCOPE

This standard covers the requirements of cold reduced carbon high tensile and multi-phase steel

sheets and strips for forming and where the surface is of prime importance. It covers sheets and strips

up to3.0 mm thick both in coil form and cut lengths.

2 REFERENCES

The following standards contain provisions which through in this text, constitute provisions of this

standard. At the time of publication, the editions indicated were valid. All standards are subject to

revision and parties to agreements based on this standard are encouraged to investigate the possibility

of applying the most recent editions of the standards indicated below:

IS No Title

IS 228(Relevant Parts) Method for chemical analysis for steel

IS 1501 : 2013 Method for Vickers Hardness Test for Metallic Materials (Part 1-

4)

IS 1586:2012 Method for Rockwell hardness test for metallic material (Part 1-

3)

IS 1599:2012 Method of bend test (Second revision)

IS 1608:2005

Metallic material – Tensile testing at ambient temperature (third

revision)

IS 8910:2010 General Technical delivery conditions of steel and steel products

IS 11999:2007 Method for determination of plastic strain ratio ‘r’ for sheet metals

IS 15756:2007

Metallic Materials – Sheet and strip- Determination of tensile

strain hardening exponent

IS/ISO 16162:2012 Cold-Rolled Steel Sheet Products - Dimensional And Shape

Tolerances ( First Revision )

IS: 1956:2006 Glossary of terms relating to Iron and steel Part-4 Steel sheet and

strip

IS 15262:2002

Geometrical Product Specifications (GPS) - Surface Texture:

Profile Method - Terms, Definitions and Surface Texture

Parameters

3 CLASSIFICATION OF GRADES

Sheets and strips shall be classified as per the following groups and designated as per the Table 1.

3.1 High Strength Low Alloy(LA)

Steel exhibit good impact and fatigue strengths. Steels that contain micro alloy additions to achieve

the required strength.

3.2 C,Mn Steel (W)

Steel exhibit high strengths with relatively lower yield stress. Steel that is strengthened by the

addition of Carbon and Manganese, to achieve the required strength.(Minimum Tensile strength

greater than 440 MPa).

3

3.3 Dual Phase Steel (Y)

Steel with very high tensile strengths and low yield ratio. Steels are strengthened with a

microstructure of ferrite and martensite, created by a suitable heat treatment.

3.4 TRIP Steel (T)

Transformation induced plasticity. Steel exhibit outstanding combination of high strength and

ductility. Steels that are strengthened by retained austenite obtained by suitable heat treatment which

transforms into martensite due to application of higher strain.

3.5 Complex Phase (C)

Steel exhibit very high tensile strength with high yield stress and also good elongation. Steels are

strengthened with a microstructure of different phases and extreme fine grain refinement.

3.6 Martensitic Steel (M)

Steel exhibit very high tensile strengthand yield stress and are strengthened with high amount of

martensite.

3.7 Hot forming grades (HF)

Steel exhibit very high tensile properties, which are obtained through a process of hot forming and

subsequent suitable quenching method.


4.1General requirements relating to the supply of cold rolled low carbon steel sheets and strip

conform to IS 8910.

4.2 Sheets and strips may be supplied either with mill or trimmed edges.

5 MANUFACTURE

5.1The method of manufacture of steel and subsequent processing for production of steel sheet and

strips shall be left at the discretion of the manufacturer or as agreed between manufacturer and

purchaser.

5.2Sheets and strips shall be supplied rimmed, semi-killed or killed as agreed between the


6 CHEMICAL COMPOSITION

a. The ladle analysis of steel, when carried out either by the methods specified in relevant parts

of IS 228 or any other established international instrumental/chemical method, shall be as

4

given in Table 3. In case of any dispute, the procedure given in relevant parts of IS 228 shall

be the referee method.

b. Alternatively, the method specified in relevant ISO standard may be used.

c. Product Analysis – Permissible variation in the case of product analysis from the limits

specified in Table 2 shall be as given in Table 3.

7 MECHANICAL AND PHYSICAL PROPERTIES

7.1 Tensile Test

a) Tensile shall be carried out only, if specified by the purchaser;

b) Tensile test shall be carried out in accordance with IS 1608/ISO 6892;

c) When specified, tests shall be carried out in accordance with the relevant Indian

Standards of test methods and Mechanical properties shall conform to the

requirements

specified in Table 4A and4B;

d) Tensile test values apply to the direction mentioned in Table 4A and4B; and

e) The yield stress values apply to the 0.2 percent proof stress, if the yield stress is not

clearly distinctive, otherwise the values apply to the lower yield stress.

7.2 Bend Test

a) Bend Test shall be carried out n accordance with IS 1599;

b) The angle of bend and the internal diameter for the different grades of material shall

be

as given in Table 5;

c) The axis of the bend shall be in the direction of rolling. The test pieces shall be deemed

to have passed the test if the outer convex surface is free from cracks; and

d) Bend test is not a mandatory requirement for this standard. The same can be applied

with mutual agreement between manufacturer and purchaser.

7.3 Tensile Strain Hardening Component –n Value

a) The tensile strain hardening is an index of the stretch-ability (n-90), shall be

applicable

only to thickness between 0.50 mm and 2.00 mm. For thickness more than 2.00 mm,

the n-value is reduced by 0.02; and

b) The tensile strain hardening component shall accordance with IS 15756 and results

shallconform to as given in Table 4A and4B.

7.4 Retest

If a test does not give the specified results, two additional tests shall be carried out at random on the

same lot. Both retests shall conform to the requirements of this standard; otherwise individual test on

each coil, (including any bundle of sheets generated from a single coil) shall meet the requirement

otherwise the individual lot shall be rejected.

8 SURFACE FINISH

5

8.1 Cold Reduced Steel Sheet and Strip

This product is normally supplied skin passed (see 8.2), but may be supplied annealed last (that is

without skin pass), if specified by the purchaser before placing the order.

8.2 Skin Pass

The purpose of skin passing is one or more the following:

a) To temporarily minimize the appearance of coil breaks, stretcher strains (Luder lines) or

fluting during fabrication of finished parts;

b) To obtain the required surface finish suitable for ordinary decorative painting; and

c) To control the shape.

Some increase in hardness and some loss in ductility will result from skin passing.

8.3 Strain Ageing

Because of strain ageing factors, it is essential that the period of final processing at the mill and

fabrication be kept to minimum. Rotation of stock, by using oldest material first, is important.

Stocking of such steels for extended periods of time should be avoided; for optimum performance the

period should not exceed six weeks.

8.4 Surface Condition

Grades are supplied either of the surface qualities A or B.

a) Surface Quality A (Un exposed) - Imperfections such as pores, slight imperfections, small

marks, minor scratches and slight colouring, which do not affect the formability or the

application of surface coatings are permitted;

b) Surface Quality B (Exposed) - The better surface shall be free of imperfections, which

might affect the uniform appearance of quality coating. The other surface shall at least

conform to surface quality A;

c) Unless otherwise agreed, a single surface of the product shall comply with the specified

requirements. On Mutual agreement between manufacturer and purchaser, any one of the

applicable surface or both the surfaces (For Strip – Outside/ Inside surface, For Sheet –

Top/Bottom Surface) shall comply with the requirements;

d) The other surface shall be such that during subsequent treatment it does not have a

deleterious effect on the better surface; and

e) Grades of this part of the standard are generally supplied in Surface quality –A.

6

8.5 Surface Finish

a) Cold reduced steel sheet and strip may be supplied in a Bright finish and matt finsh,

dull in appearance, which is suitable for ordinary decorative painting but is not

recommended for electro plating. Surface roughness may be given subject to mutual

agreement between the manufacturer and the purchaser;

b) When cold reduced sheet and strip is deformed during fabrication, localized areas may

roughen to some degree and such affect portions of the part may require hand finishing

to prepare the surface for the intended application; and

c) Designation of surface finish shall be as per Table 6.

8.6 Oiling

As a deterrent to rusting, a coating of oil is usually applied to the product. The oil is not intended as a

drawing or forming lubricant and should be easily removable with degreasing chemicals. The

product may be ordered not oiled, if required, in which case, the supplier has no responsibility, if

oxidation occurs. For type of oiling, Table 7 can be referred (Reference purpose only).


9.1The finished sheets and strips shall be reasonably free from harmful defects such as scale, rust,

blisters, laminations, pitting, porosity, cracked or torn edges or any other defects which are harmful

to the intended use

9.2The degree or amount of surface defects in a strip may be expected to be more than in cut lengths

because of the impossibility of rejecting portions of a strip. The purchaser should take this into

account and the percentage of admissible defects may be agreed at the time of the enquiry and order.

9.3The sheets shall be reasonably flat and edges cleanly sheared and squared to the specified

dimensions

10 DIMESNIONS AND TOLERANCES

10.1Unless and other wise agreed to between manufacturer and the purchaser, standard dimensions

of cold rolled sheets and strips shall be as given below:

Thickness, mm = 0.40, 0.45, 0.50 ,0.55 ,0.63, 0.70 ,0.80 ,0.90 ,1.00 ,1.20 ,1.25 ,1.40 ,1.50

,1.60 ,1.80 and 2.00

The following are the preferred thickness for sheets above 2.00 mm:

Thickness, mm= 2.50 mm, 2.65 mm, 3.00 mm.

10.2Dimensional and shape tolerances applicable to cold rolled sheets and strip shall be as given in

IS/ISO 16162. Stricter dimensional tolerances can be agreed between manufacturer and purchaser.

10.3For Untrimmed edges, width tolerances shall be +20/-0 mm and for edges which are trimmed

before cold rolling, width tolerances shall be +7/-0 mm. For Edges trimmed after cold rolling and

annealing, width tolerances shall be as per IS/ISO 16162.

7

11 SAMPLING AND TESTS

11.1One representative sample from a strip or a lot of sheets shall be taken for tensile testing. A lot

consists of 50 tonnes or less of sheets or strips of the same quality rolled to same thickness and

processed in same condition. If the lot consists of more than one heat, samples from each heat shall

be tested.

11.2For bend tests, one sample each lot of 50 tonnes of same heat or part thereof or one sample from

each coil shall be taken

11.3The specimens shall not undergo any treatment on either surface before testing. In case of strips,

samples shall be taken from the beginning or end of the strip.

11.4The centre of each test piece shall be at a quarter widths. When it is not feasible, however the

sampling should be made as close to the aforementioned position as possible.

12 MARKING

12.1 Marking

The following shall be legibly marked or printed on a sticker attached on the top of each bundle of

package of sheets /on a tag attached to each coil:

a) Manufacturer’s name or trade mark;

b) Quality designation and grade;

c) Product dimensions;

d) Cast or identification mark by which the sheet or strip may be traced to cast or casts from

which they were made; and

e) Mass/Net weight.


The material may also be marked with the standard mark.The use of standard mark is governed by

the provisions of Bureau of Indian standards Act 1986 and the rules and regulations made there

under. The details of conditions under which the licence for the use of standard mark may be granted

to manufacturers or producers may be obtained from the bureau of Indian standards.

12.3 Packing

a) Each sheet shall be treated on both sides with non-hardening type rust preventive oil,

which can be easily washed with aqueous alkali solution;

b) Sheets and strips shall preferably be supplied in bundles or packages not weighing more

than 3 tonnes or as agreed to between the purchaser and the manufacturer; and

c) Sheets and strips shall be securely packed in water resistant material and cover all over

with steel envelope and securely tied round with steel straps and preferably with wooden

battens underneath to prevent the sheets from rusting and damage during transit.

8


Designation (Quality) Grade Available Product Range (mm)

(1) (2) (3)

High Strength Low Alloy ISC310LA 0.40-3.00

ISC320LA 0.40-3.00

ISC350LA 0.40-3.00

ISC380LA 0.40-3.00

ISC410LA 0.40-3.00

ISC440LA 0.60-3.00

ISC470LA 0.60-3.00

ISC510LA 0.60-3.00

ISC550LA 0.60-3.00

ISC590LA 0.60-3.00

ISC600LA 0.70-3.00

ISC700LA 0.80-3.00

ISC860LA 0.80-3.00

C,Mn steel ISC490W 0.60-3.00

ISC540W 0.60-3.00

ISC590W 0.60-3.00

Dual Phase steel ISC450Y 0.60-2.50

ISC490Y 0.60-2.50

ISC540Y 0.60-2.50

ISC590YL 0.60-2.50

ISC590Y 0.60-2.50

ISC590YH 0.60-2.50

ISC780Y 0.60-2.50

ISC780YH 0.60-2.50

ISC980YL 0.80-2.50

ISC980Y 0.80-2.50

ISC980YH 0.80-2.50

ISC1180Y 0.80-2.50

ISC1180YL 0.80-2.50

ISC1180YH 0.80-2.50

TRIP steel ISC590T 0.60-2.50

ISC690T 0.70-2.50

ISC780T 0.70-2.50

Complex Phase steel ISC600C 0.60-2.50

ISC780C 0.60-2.50

ISC980C 0.80-2.50

9

Martensitic steel ISC900M 0.80-2.50

ISC1100M 0.80-2.50

ISC1300M 0.80-2.50

ISC1500M 0.80-2.50

Hot Forming Grades ISC480HF 0.60-2.50

NOTES:

1For any thickness greater than or less than the mentioned range, the same can be produced as mutually agreed between manufacturer

and purchaser. Acceptance criteria for the range out of available product range shall be as agreed between Purchaser and manufacturer.

2 Nomenclature of grade is explained in Annex A.

Table 2Chemical Composition

Grade C

(% Max)

Mn

(% Max)

S

(% Max)

P

(% Max)

(1) (2) (3) (4) (5)

ISC310LA 0.10 1.00 0.025 0.07

ISC320LA 0.10 1.00 0.025 0.07

ISC350LA 0.10 1.20 0.025 0.03

ISC380LA 0.12 1.40 0.025 0.03

ISC410LA 0.12 1.50 0.025 0.03

ISC440LA 0.12 1.60 0.025 0.03

ISC470LA 0.14 1.60 0.025 0.03

ISC510LA 0.14 1.80 0.025 0.03

ISC550LA 0.14 1.80 0.025 0.03

ISC590LA 0.16 2.50 0.025 0.07

ISC600LA 0.16 2.50 0.025 0.07

ISC700LA 0.16 2.50 0.025 0.07

ISC860LA 0.18 3.00 0.025 0.07

ISC490W 0.20 2.00 0.030 0.05

ISC540W 0.20 2.50 0.030 0.05

ISC590W 0.25 2.50 0.030 0.05

ISC450Y 0.15 2.0 0.02 0.10

ISC490Y 0.15 2.0 0.02 0.10

ISC540Y 0.15 2.2 0.02 0.10

ISC590YL 0.15 2.5 0.02 0.10

ISC590Y 0.15 2.5 0.02 0.10

ISC590YH 0.15 2.5 0.02 0.10

ISC780Y 0.18 2.5 0.02 0.10

ISC780YH 0.18 2.5 0.02 0.10

ISC980YL 0.25 3.5 0.02 0.10

ISC980Y 0.25 3.5 0.02 0.10

ISC980YH 0.25 3.5 0.02 0.10

10

ISC1180Y 0.30 4.0 0.02 0.10

ISC1180YL 0.30 4.0 0.02 0.10

ISC1180YH 0.30 4.0 0.02 0.10

ISC590T 0.30 2.2 0.015 0.10

ISC690T 0.35 2.5 0.015 0.10

ISC780T 0.35 2.5 0.015 0.10

ISC600C 0.18 2.2 0.015 0.10

ISC780C 0.18 3.0 0.015 0.10

ISC980C 0.20 3.5 0.015 0.10

ISC900M 0.25 3.5 0.015 0.10

ISC1100M 0.30 4.0 0.015 0.10

ISC1300M 0.30 4.0 0.015 0.10

ISC1500M 0.30 4.0 0.015 0.10

ISC480HF 0.32 2.0 0.015 0.050

NOTES:

1Restricted chemistry can be mutually agreed between purchaser and manufacturer.

2 When the steel is Aluminium killed, the total Aluminium content shall not be less than 0.02 percent. When the steel is silicon killed,

the silicon content shall not be less than 0.10 percent. When the steel is Aluminium silicon killed, the silicon content shall not be less

than 0.03 percent and total Aluminium content shall not be less than 0.01 percent. (Note: If mutually agreed, for aluminium killed

steel, aluminium content can be less than 0.02 percent).

3The nitrogen content of the steel shall not be more than 0.012 percent.

4The steel can be made with micro alloying elements like Chromium, Nickel, Niobium, Vanadium, Titanium, Molybdenum, Boron,

Calcium and others, either added individually or in combination. For Hot forming grades, maximum limit of boron shall be

0.006percent Maximum

Table 3 Variation in Product Analysis

Element Specified chemical composition

Limit, Max Variation over specified limit percent, Max

(1) (2) (3)

Carbon ≤0.15

>0.15

0.02

0.03

Manganese

≤0.60

>0.60 to ≤1.15

>1.15

0.03

0.04

0.05

Sulphur ≤ 0.05 0.005

Phosphorus ≤0.05

>0.05

0.005

0.010

Silicon ≤0.60

>0.60

0.03

0.06

Micro Alloy - Subject to negotiation

NOTE — For carbon content less than 0.10 percent, variation over specified limit can be mutually agreed between purchaser and

manufacturer.

11

Table 4AMechanical Properties at Room Temperature in as Delivered Condition for Annealed and Skin Passed Sheets and Strips


Grade

Minimum

Tensile

Strength

(MPa)


MPa Elongation %

Gauge Length- 50 mm Test

Piece

Direction


T<

0.40

0.40≤

T

<0.80

0.80≤

T

<1.00

T

≥1.00

T<

0.40

0.40≤

T

<0.60

0.60≤

T

<0.80

0.80≤

T

<1.00

1.00≤

T

<1.20

1.20≤

T

<1.60

1.60≤

T

<2.00

2.00≤

T

<2.50

T>

2.50

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14)

ISC590LA 590 -- 430-

580

420-

570

410-

560 -- -- 17-32 17-32 18-33 18-33 ≥18 T

ISC490W 490 -- 305-

410

295-

400

295-

400 -- -- 23-35 23-35 24-36 24-36 ≥24 T

ISC540W 540 -- 335-

440

325-

430

325-

430 -- -- 20-32 20-32 21-33 21-33 ≥21 T

ISC590W 590 -- 365-

470

355-

460

355-

460 -- -- 17-29 17-29 18-30 18-30 ≥18 T

ISC450Y 450 -- 270-

360

260-

370

250-

340 -- -- 26-42 27-43 28-44 29-45 ≥29 T

ISC490Y 490 -- 310-

410

300-

400

290-

390 -- -- 22-38 23-39 24-40 25-41 ≥25 T

ISC540Y 540 -- 340-

450

330-

440

320-

430 -- -- 18-35 19-36 20-37 21-38 ≥21 T

ISC590YL 590 -- 300-

400

290-

390

280-

380 -- -- 18-33 19-34 20-35 21-36 ≥23 T

ISC590Y 590 -- 340-

460

330-

450

320-

440 -- -- 17-32 18-33 19-34 20-35 ≥21 T

ISC590YH 590 -- 440-

560

430-

550

420-

540 -- -- 16-31 17-32 18-33 19-34 ≥19 T

ISC780Y 780 -- 440-

610

430-

600

420-

590 -- -- 12-25 13-26 14-27 15-28 ≥16 T

12

ISC780YH 780 -- 570-

690

560-

680

550-

670 -- -- 11-24 12-25 13-26 14-27 ≥14 T

ISC980YL 980 -- -- 590-

740

580-

730 -- -- -- 10-20 11-21 12-22 ≥13 T

ISC980Y 980 -- -- 590-

930

580-

920 -- -- -- 9-20 10-21 11-22 ≥12 T

ISC980YH 980 -- -- 730-

930

720-

920 -- -- -- 9-19 10-20 11-21 ≥12 T

ISC1180Y 1180 -- -- 835-

1225

825-

1215 -- -- -- 5-16 6-17 7-18 ≥7 T

ISC1180YL 1180 -- -- 750-

1010

740-

1000 -- -- -- 6-16 7-17 8-18 ≥8 T

ISC1180YH 1180 -- -- 870-

1210

860-

1200 -- -- -- 5-16 6-17 7-18 ≥7 T

ISC590T 590 -- 370-

520

360-

510

350-

500 -- -- 27-42 28-43 29-44 30-45 ≥31 T

ISC690T 690 -- 390-

540

380-

530

370-

520 -- -- 22-37 23-38 24-39 25-40 ≥25 T

ISC780T 780 -- 420-

570

410-

560

400-

550 -- -- 17-32 18-33 19-34 20-35 ≥21 T

ISC600C 600 -- 350-

510 -- -- ≥16 T

ISC780C 780 -- 500-

700 -- -- ≥10 T

ISC980C 980 -- 700-

900 -- -- -- ≥8 T

ISC900M 900 -- -- 700-1000 -- -- -- ≥3 T

ISC1100M 1100 -- -- 860-1100 -- -- -- ≥3 T

ISC1300M 1300 -- -- 1030-1300 -- -- -- ≥2 T

ISC1500M 1500 -- -- 1200-1500 -- -- -- ≥2 T

ISC480HF 480 -- 330-

430

320-

420

310-

410 -- -- 19-32 20-33 21-34 22-35 ≥23 T

13

Table 4B- Mechanical Properties at Room Temperature in as Delivered Condition for AnnealedandSkin Passed Sheets and Strips


Grade

Minimum

Tensile

Strength

(MPa)


MPa Minimum Elongation %

Gauge Length- 80 mm

Test Piece

Direction

Tensile strain

hardening

component

(n90)


T≤

0.50

0.50<

T

≤0.70

T>

0.70

T≥

0.50

0.50<

T

≤0.70

T>

0.70

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)

ISC310LA 310 210-310 210-290 210-290 26 28 30 T ≥0.16

ISC320LA 320 240-340 240-320 240-320 24 26 28 T ≥0.15

ISC350LA 350 260-360 260-340 260-340 22 24 26 T ≥0.15

ISC380LA 380 300-400 300-380 300-380 19 21 23 T ≥0.14

ISC410LA 410 340-440 340-420 340-420 17 19 21 T ≥0.13

ISC440LA 440 -- 380-480 380-480 15 17 19 T ≥0.12

ISC470LA 470 -- 420-520 420-520 13 15 17 T ≥0.11

ISC510LA 500 -- 460-580 460-580 -- 11 13 T --

ISC550LA 550 -- 500-620 500-620 -- 10 12 T --

ISC600LA 600 -- ≥550 ≥500 -- 11 11 T --

ISC700LA 700 -- -- ≥650 -- -- 10 T --

ISC860LA 860 -- -- 830 -- -- 4 T --

Notes for Table 4A & 4B:

a) 1 N/mm2 = 1 MPa = 0.1020 kgf/mm

2

b) Stricter Mechanical properties requirement may be agreed between Manufacturer and Purchaser, before placing the order.

14

c) Mechanical properties apply only to skin-passed products

d) The values of yield stress are the 0.2 % proof stress for products which do not represent a marked yield point and the lower yield stress for

the others

e) Test Piece Direction – L : Rolling Direction, Test Piece Direction – T: Perpendicular to rolling direction

f) Any Additional test may be carried out as per mutual agreement between Manufacturer and Purchaser

g) Choice of Properties: Properties are applicable as per Thickness range provided in Table 4A & 4B. If mutually agreed between

Manufacturer and purchaser and properties range (Yield Point or Proof Stress and Elongation ) is not required as per thickness range, then

Minimum and Maximum values of the respective grade (Yield Point or Proof Stress and Elongation ), shall be considered as Limits of

Yield point or Proof stress and elongation. For Ex: In Grade IS590LA, Properties are not required as per thickness range, then Limits of

Yield Point or Proof Stress:410-580 MPa and Elongation : Min 17 %.

h) (--) → Not required.

15

Table 5Bend Test

Minimum Tensile Strength (MPa) Bend Angle Bend Radius

(1) (2) (3)

340 1800 Close

370 1800 Close

390 1800 Close

440 1800 Close

490 1800 Close

540 1800 0.5 x Thickness








NOTE —For grades, where minimum tensile requirement is not mentioned in the above table, nearest minimum tensile strength value

can be applied.

Table 6Surface Finish

Surface Finish Class Surface Finish Designation Surface Roughness (µm)

(1) (2) (3)

Dull Finish D 0.50≤Ra≤2.00

Bright Finish B Ra≤0.60µm

NOTES:

1 Surface roughness Ra is the average roughness.

2 Restricted range of surface roughness can be agreed between manufacturer and Purchaser.

3 Unless and other wise mentioned, general condition of surface shall be Dull Finish with surface designation D.


Type of Oiling Description

(1) (2)

Normal Rust preventive Oil Commonly used for steel strip and sheet for rust

prevention

Special Rust

preventive Oil

High Lubrication rust

preventive oil For rust prevention and better frictional properties

during press work Solid lubricant

No Oiling Surface will be dry and prone to oxidation

NOTE — Above table for the purpose of reference only

16

ANNEX A

(Table 1 Note 2)

NOMENCLATURE OF GRADE

ISC590LA



Cold Rolled Steel

Indian Standard

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For Comments Only


HOT ROLLED STEEL SHEET, PLATE AND STRIP FOR

FORMING AND FLANGING PURPOSES -

SPECIFICATION

(Fourth Revision)

ICS 77.140.50

FOREWORD This Indian Standard (Fourth Revision) was adopted by the Bureau of Indian Standards, after the draft finalizedby Wrought Steel Products Sectional Committee had been approved by the Metallurgical Engineering DivisionCouncil. This standard was first published in 1970 and subsequently revised in 1992, 2002and 2011.While reviewing thestandard, in the light of experience gained during these years, the Committee decided to revise it to bring inline with that present practices being followed by the Indian industry. In this revision the following changeshave been made: a) Chemical and mechanical properties have been modified; b) New grade designation system has been adopted; simultaneously old designations have also been given in Annex 1; c) Grade HR5 designationsof IS1079:2009are included in this fourth revision; d) New grades ferrite-bainite steel, multiphase steel and martensitic steels are added; e) Clauses are rearranged. Clauses 4.2, 6.3, 8.3.2, 12 and 18.2 are added. Clauses 1, 2,3, 5, 7.1, 8.1,

8.1.1, 8.2, 9.1, 10.2, 15, 17.1, 18.1 and 19have been modified; f) Requirements of dimensions and tolerances have been separated from the standard and adopted in IS/ISO 16160: 2005 'continuously hot-rolled steel sheet products—Dimensional and shape tolerances'. In the formulation of this standard, assistance has been derived from ISO 20805: 2005 ‗Hot rolled steel sheet in coils of higher yield strength with improved formability and heavy thickness for cold forming‘, and DIN EN 10149-2:2013 ‗hot rolled flat products made of high yield strength steels for cold forming‘, DIN EN 10338:2015 ‗Hot rolled and cold rolled non-coated products of multiphase steels for cold forming‘, JIS G 3134:2006 ‗Hot rolled high strength steel plate, sheet and strip with improved formability for automobile structural uses‘, and JFS A 1001:2014 ‗Hot rolled steel sheet and strip for automobile use‘. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2 : 1960 ‗Rules for rounding off numerical values (revised). The number of significant places retained inthe rounded off value should be the same as that of the specified value in this standard.

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1 SCOPE

This standard covers the requirements of hot rolled steel sheet, plate and strip products for flanging and forming applications required for the manufacture of automobiles,integral coaches, and general engineering purpose use where guaranteed mechanical properties and suitability for flanging and forming simple cold pressed parts are necessary.

2 REFERENCES

The following standards contain provisions, whichthrough reference in this text constitute provisionsof this standard. At the time of publication, theeditions indicated were valid. All standards aresubject to revision and parties to agreements basedon this standard are encouraged to investigate thepossibility of applying the most recent editions ofthe standards indicated below: IS No. Title

228 (in variousparts) Methods of chemical analysis of steels 1599: 2012 Method for bend test (second revision)

1608: 2005 Metallic materials – Tensile testing at ambient temperature (third revision)

1730: 1989 Dimensions for steel plates, sheets strips and flats for General engineering purposes (secondrevision)

1757: 1988 Method for charpy impact test (V-notch) for metallic material(second revision)

1956 Glossary of terms relating to iron and steel: (Part 4): 1975 Steel sheet and strip (firstrevision)

8910: 2010 General technical delivery requirements for steels and steel products(first revision)

1852:1985 Rolling and cutting tolerances for hot rolled steel products

(fourth revision) IS/ISO 16160: 2005 Continuously hot-rolled steel sheet products — Dimensional and shape tolerances

3 TERMINOLOGY

For the purpose of this standard the definitionsgiven in IS 1956 (part 4) and the following definitionsshall apply. 3.1 Thermo-Mechanical Rolling — A hot rolling process in which the final deformation is carried out in a certain temperature range to get fine microstructure which is achieved due to finely distributed precipitates mostlycarbides and/or nitrides, leading to a material condition with certain properties that cannot be achieved or repeated by heat treatment alone, and such deformation is followed by cooling, possibly with increased cooling rates, with or without tempering, self-tempering included. Note: Subsequent heating above 580oC typically can lower the strength values.

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3.2 Normalizing Rolling — A hot rolling process in which the final deformation is carried out within a certain temperature range equivalent to normalizing temperature, leading to a material condition equivalent to that obtained after normalizing, such that the specified mechanical properties would still be met in the event of any subsequent normalizing.

3.3 Ferritic-Bainitic Steel (High Hole Expansion)— Steel exhibit good hole expansion than regular HSLA steel. Steel contains matrix of Ferrite and Strengthened ferrite containing bainite or strengthened bainite as second phase.

3.4 Dual-Phase Steel — Steel with very high tensile strengths and low yield ratio. Steel consisting of mainly ferrite and martensite and possible bainite as a complementary phase.

3.5 Multiphase Steel — Multiphase steels have multiphase microstructure contains ferrite matrix with fractions of bainite, martensite, tempered martensite, retained austenite and pearlite. 3.6 Martensitic Steel — Martensitic Steels have mainly martensite matrix with small amounts of ferrite and/or bainite.

4 SUPPLY OF MATERIALS

4.1General requirements relating to the supply ofmaterial shall conform to IS 8910.

4.2Material shall be supplied either with mill edges or flattened and sheared or trimmed/slitedges.

5DESIGNATION AND GRADES

There shall be 36 grades of hot rolled steel plates,sheets and strips designated as follows.


(Clause 5)

S. No. Grade Name and Designation

1 ISH290S

Structural Steel

2 ISH310S 3 ISH330S 4 ISH360S 5 ISH370S 6 ISH400S 7 ISH410S 8 ISH440S 9 ISH490S 10 ISH320LA

High Strength Low Alloy Steel – High yield

ratio type steel

11 ISH360LA 12 ISH390LA 13 ISH410LA

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14 ISH430LA 15 ISH450LA 16 ISH480LA 17 ISH500LA 18 ISH550LA 19 ISH600LA 20 ISH650LA 21 ISH700LA 22 ISH750LA 23 ISH440R

High Strength Structural Steel (HSLA type)

24 ISH490R 25 ISH540R 26 ISH590R 27 ISH780R 28 ISH440F

Ferrite-Bainite Steel (Hole Expansion type)

29 ISH540F 30 ÍSH590F 31 ISH540Y

Dual Phase Steel 32 ISH590Y 33 ISH780Y 34 ISH750MP

Multi Phase Steel 35 ISH980MP 36 ISH1180MS Martensitic Steel

Note 1 - Grades are defined based on the Minimum tensile strength required Nomenclature for new designation and grades ISH290 S



Hot Rolled Steel

Indian Standard

6MANUFACTURE

6.1 Steel shall be manufactured by any process of steel making except Bessemer process. It may be followed by secondary refining or secondary vacuum, treatment. 6.2 Steel shall be semi-killed or killed.However, except structural type steel, all other grades shall be supplied in killed condition only.

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6.3Subject to prior agreement between the manufacturer and the purchaser, a suitable protective treatment may be given to the material. Applicable type of oiling is as per Table 2.


(Clause 6.3)

Type of Oiling As hot Rolled Pickling Skin Pass Shot blast

Normal Rust preventive Oil 1) x √ x / √ √

Special Rust preventive Oil 2)

High Lubrication rust preventive oil 3)

x √ x / √ x

Solid lubricant 4) x √ x / √ x

No Oiling x x / √ x / √ x

1) Commonly used for steel strip, plate and sheet for rust prevention. 2) Special rust preventive oil is applied to the steel sheet, plate and strip with pickling finish. 3) The rust preventive oil in combined use as press oil and rust preventive oil. This kind of oil

shall be mutually agreed. 4) Solid lubricant is for better frictional properties during press work. This kind of lubricant shall

be mutually agreed.

Notes:

1Guarantee of rust prevention is depend on type of oil and quantity of oil. Purchaser should evaluate before confirming the oiling. 2For material ordered ―No Oiling‖, there is risk of rusting of steel. In that case, supplier has no responsibility if oxidation/rusting occur.

7 CHEMICAL COMPOSITIONS

7.1 Ladle Analysis

Ladle analysis of the material when carried out either by the method specified in the relevant part ofIS 228 or any other established instrumental/chemical method, shall be as given in Table 3A and 3B. In case of dispute, the procedure given in the relevant part of IS 228 shall be the referee method.

7.2 ProductAnalysis

The permissible variation in the case of productanalysis from the limits specified in Table 3A and 3B shall beas given in Table 4.

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Table 3A Chemical Composition

(Clauses 7.1 and7.2)

S. No. (1)

Quality Constituent, Percent, Max

Grade (2)

Designation (3)

C

(4)

Mn

(5)

Si

(6)

P

(7)

S

(8)

Micro-Alloy

(9)

CE1)

(10)

1) ISH290S

Structural Steel

0.12 0.60 0.50 0.040 0.040 0.15 - 2) ISH330S 0.15 0.80 0.50 0.040 0.040 0.15 - 3) ISH360S 0.17 1.20 0.50 0.040 0.040 0.15 - 4) ISH410S 0.20 1.30 0.50 0.040 0.040 0.15 0.42 5) ISH490S 0.24 1.602) 0.50 0.040 0.040 0.15 0.50 6) ISH320LA

High Strength Low Alloy –

High yield ratio type steel

0.12 1.20 0.50 0.025 0.020 0.22 - 7) ISH360LA 0.12 1.20 0.50 0.025 0.020 0.22 - 8) ISH390LA 0.12 1.30 0.50 0.025 0.020 0.22 - 9) ISH410LA 0.12 1.40 0.50 0.025 0.020 0.22 -

10) ISH430LA 0.12 1.502) 0.50 0.025 0.020 0.22 - 11) ISH450LA 0.12 1.502) 0.50 0.025 0.020 0.22 - 12) ISH480LA 0.12 1.502) 0.50 0.025 0.015 0.22 - 13) ISH500LA 0.12 1.602) 0.50 0.025 0.015 0.22 *

14) ISH550LA 0.12 1.70 0.50 0.025 0.015 0.22 *

15) ISH600LA 0.12 1.80 0.50 0.025 0.015 0.22 *

16) ISH650LA 0.12 1.90 0.50 0.025 0.015 0.22 * 17) ISH700LA 0.12 2.00 0.60 0.025 0.015 0.22 *

18) ISH750LA 0.12 2.10 0.60 0.025 0.015 0.22 *

Table 3B Chemical Composition

(Clauses 7.1 and7.2)

S.

No.

(1)


Grade (2)

Designation (3)

C

(4)

Mn

(5)

Si

(6)

P

(7)

S

(8)

Micro-Alloy

(9)

CE1)

(10)

1) ISH310S

Structural Steel

0.15 0.80 0.50 0.040 0.030 0.15 - 2) ISH370S 0.17 1.20 0.50 0.040 0.030 0.15 - 3) ISH400S 0.20 1.30 0.50 0.040 0.030 0.15 0.42 4) ISH440S 0.24 1.502) 0.50 0.040 0.030 0.15 0.45 5) ISH440R


0.20 1.502) 0.50 0.030 0.020 0.20 *

6) ISH490R 0.20 1.602) 0.50 0.030 0.020 0.20 *

7) ISH540R 0.20 1.70 0.50 0.030 0.020 0.20 *

8) ISH590R 0.20 1.80 * 0.030 0.020 0.20 *

9) ISH780R 0.20 2.00 * 0.030 0.020 0.25 *

10) ISH440F Ferrite-Bainite Steel (Hole

Expansion type)

0.16 1.60 * * 0.020 0.20 *

11) ISH540F 0.16 1.80 * * 0.020 0.20 *

12) ÍSH590F 0.16 2.00 * * 0.020 0.20 *

13) ISH540Y Dual Phase Steel

0.16 1.80 * * 0.020 0.20 *

14) ISH590Y 0.16 2.00 * * 0.020 0.22 *

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7

15) ISH780Y 0.16 * * * 0.020 0.25 *

16) ISH750MP Multi Phase Steel

0.18 * * * 0.015 0.35 *

17) ISH980MP 0.23 * * * 0.015 0.35 *

18) ISH1180MS Martensitic

Steel 0.25 *

* * 0.015 0.40

*

NOTES (For both Table 3A & 3B) 1. Steels of these grades can be supplied with the addition of micro-alloying elements like Boron, Titanium, Niobium and Vanadium either singly or in combination as per above table. However, Boron addition will be restricted to 0.006percent max. 2. The nitrogen content of the steel shall not be more than 0.009 percent. For aluminium killed or aluminium silicon killed the nitrogen content shall not exceed 0.012 percent. This shall be ensured by occasional checking. 3. When the steel is killed by aluminium the total aluminium content should not be less than 0.02 percent. Aluminium less than 0.02 percent can be mutually agreed between the purchaser and supplier for Al killed steel.When steel is silicon killed the silicon content shall not be less than 0.1 percent. When the steel is aluminium silicon killed the silicon content shall not be less than 0.03 percent and total aluminium content shall not be less than 0.01 percent. 4. The material may be supplied in the copper bearing quality in which case the copper shall be between 0.20 and 0.35 percent on analysis. 5. The elements (e.g Cr, Mo, Ni, etc) not mentioned in above table can be added upto 1.0 percent max either singly or in combination. 7. Restricted chemical composition may be mutually agreed to between the purchaser and the supplier. 1) Carbon equivalent (CE) based on ladle analysis = C +

Mn

6+

(Cr+Mo+V)

5+

(Ni+Cu )

15

2) For each reduction of 0.01 below the specified maximum percent carbon, an increase of 0.05 percent manganese over the specified maximum up to 1.65 is permitted. * As per mutual agreement between the supplier and purchaser.

Table 4 Permissible Variation for Product Analysis

(Clauses 7.2) S. No.

(1) Constituent

(2) Percentage Limit of

Constituent (3)

Variation Over the Specified Maximum Limit, Percent, Max

(3)

i) Carbon ≤0.15

>0.15 0.02

0.03

ii) Manganese ≤0.60

>0.60 to ≤1.15

>1.15

0.03

0.04

0.05 iii) Sulphur ≤ 0.05 0.005

iv) Phosphorus ≤0.05

>0.05

0.005 0.010

v) Silicon ≤0.60

>0.60

0.03

0.06 vi) Copper ≤0.35 0.03 vii) Micro Alloy - Subject to negotiation

NOTES:

1 Product analysis shall not be applicable to rimming steel. 2 For carbon content less than 0.10 %, variation over specified limit can be mutually agreed between purchaser and manufacturer.

8 TENSILE TEST

8.1Number of Tensile Tests

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One tensile test shall be taken from each cast.

8.1.1 Where plates, sheets and stripsof more than one thickness are rolled from the same cast, one additional tensile test shall be made from the material:

a) In the case of sheets and strips (for thickness <=5mm) - One sample shall be tested for thickness<2.0mm, One sample shall be tested for thickness between ≥2.0 to <3.20mm and One sample shall be tested for Thickness ≥3.20mm.

b) In the case of plates and strips (for thickness >5mm) - For each variation thickness of 3 mm from the thickness of test piece first selected.

8.2 Tensile Test Pieces

The sampling position of test piece shall be at a quarter-width from the edge of the sheet and strip. If this is infeasible, the sampling should be made as close to the aforementioned position as possible. Unless otherwise mentioned tensile test piece direction shall be cut transverse to the rolling directionand shall be of full thickness of the material. If agreed between the supplier and purchaser different orientation test piece may be used, but the values shall be as per table 5A and 5B.Selection of gauge length can also be mutually agreed between supplier and purchaser.

8.2.1 Tensile test pieces shall be of dimensions asspecified in IS 1608. 8.3Tensile Test

When tested in accordance with IS 1608 as applicable, the mechanical properties shall be as given in Table 5A and 5B.

8.3.1If the percentage elongation of any test piece is less than that specified in Table 5A and 5B, and if any part of the fracture is outside the middle half of the gauge length as scribed before the test, the test shall be discarded and a retest shall be carried out.

8.3.2Additional product characteristics can be agreed between the purchaser and supplier.

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Table 5A Tensile Properties (Structural and HSLA high yield ratio type steels with UTS range

specified)

(Clause 8.3)

S. No.

(1)

Grade

(2)

Yield

Strength, Min MPa (4)

Tensile

Strength

MPa

(5)

Percentage Elongation After

Fracture A2), 3)

Min

GL=80 mm (t< 3mm)

(6)

5.65√�� (t > 3mm)

(7)

1 ISH290S 165 290-400 22 30

2 ISH330S 205 330-440 20 28

3 ISH360S 235 360-470 19 26

4 ISH410S 255 410-520 17 23

5 ISH490S 355 490-630 16 20

6 ISH320LA 255 320-420 25 27

7 ISH360LA 300 360-460 23 25

8 ISH390LA 315 390-510 20 24

9 ISH410LA 340 410-520 20 23

10 ISH430LA 355 430-550 19 23

11 ISH450LA 380 450-570 18 21

12 ISH480LA 420 480-620 16 19

13 ISH500LA 450 500-670 14 18

14 ISH550LA 500 550-700 12 14

15 ISH600LA 550 600-760 12 14

16 ISH650LA 600 650-820 11 13

17 ISH700LA# 650 700-880 10 12

18 ISH750LA# 700 750-950 10 12

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Table 5B Tensile Properties (Structural and High Strength Structural (HSLAtype) and multi

phase steels with YS range and Elongation range specified)

(Clause 8.3)

S. No

Quality Yield Strength (Yield Point/Proof Stress), Mpa Tensile

Strength, MPa

Percentage Elongation After Fracture A2), 3) Min Hole

Expansion

% min Designation

t < 2 2<t<3.2 3.2<t<6.3 t>6.3

t < 2 2<t<3.2 3.2<t<6.3 t>6.3 t≤3 t>3

GL

Lo=50 mm GL

Lo=80 mm GL

Lo=5.65√So (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14)

1 ISH310S 195min 185min 175min 165min 310min 33 34 38 40 * * -

2 ISH370S 225min 215min 205min 195min 370min 32 33 36 38 * * -

3 ISH400S 245-375 235-355 225-345 215min 400min 31 33 35 37 * * -

4 ISH440S 285-400 275-390 265-380 255min 440min 29 30 33 34 * * -

5 ISH440R 305-450 305-440 305-430 295min 440min 26 27 28 29 * * -

6 ISH490R 375-500 365-490 355-480 345min 490min 22 23 24 25 * 22 -

7 ISH540R 430-570 420-560 410-550 400min 540min 19 20 21 22 * 19 -

8 ISH590R 480-630 470-620 450-610 450min 590min 17 18 19 20 * 17 - 9 ISH780R - 685-835 675-825 675min 780min - 14 15 15 * 12 -

10 ISH440F 285-420 275-420 265-420 265min 440min 29 30 33 * 22 25 100 11 ISH540F 375-540 365-530 355-520 355min 540min 22 23 24 * 17 20 80 12 ÍSH590F 460-620 450-620 440-620 440min 590min 18 19 20 * 15 17 75 13 ISH540Y 305-450 295-440 295-440 295min 540min 24 25 26 * 19 23 - 14 ISH590Y * 325-490 325-490 325min 590min 22 23 24 * 17 20 - 15 ISH780Y - 390-635 380-625 380min 780min - 16 17 * 12 15 - 16 ISH750MP - 650-830 650-830 650min 750min - * * * 10 12 - 17 ISH980MP - 780-1000 780-1000 780min 980min - * * * 5 6 -

18 ISH1180M

S - 920-1200 920-1200 900min 1180min - * * * 4 5 -

NOTE (Table 5A & 5B) - Grade 165 may be supplied based on chemical composition only, if agreed to between the manufacturer and the purchaser. 1) 1Mpa = 1N/mm2

2) The non-proportional test piece with a fixed gauge length, up to 5 mm thick sheet can be used in conjunction with a conversion table in accordance with IS 3803. In case of dispute, however, only results obtained on a proportional test piece will be valid for material over 3 mm in thickness. 3) Where,‗t‘ is thickness, GL (L0) = Gauge Length, and So-Original cross-sectional area of gauge length. 4) The yield stress values apply to the 0.2 percent proof stress, if the yield stress is not clearly distinctive, otherwise the values apply to the lower yield stress. 5) Restricted properties along with maximum values on YS in grades ISH310S& ISH370S and Elongation may be agreed between purchaser and manufacturer.

#For thickness >8mm the minimum yield strength can be 20Mpa lower. * Properties on mutual agreement between the purchaser and the manufacturer.

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9 BENDTEST

9.1 NumberofBend Test

One bend test shall be taken from each cast.

9.1.1Where plates, sheets and strips of more than one thickness are rolled from the same cast, one additional tensile test shall be made from the material:

a) In the case of sheets and strips (for thickness <=5mm) - One sample shall be tested for thickness<2.0mm, One sample shall be tested for thickness between ≥2.0 to <3.20mm and One sample shall be tested for Thickness ≥3.20mm.

b) In the case of plates and strips (for thickness >5mm) - For each variation thickness of 3 mm from the thickness of test piece first selected.

9.2 The bend test shall be carried out in accordancewith IS 1599.

9.2.1 Bend test piece shall be cut so that the axisof the bend is parallel to the direction of rolling thatis the longer axis of the test piece shall be 90° to thedirection of rolling.

9.2.2 The test piece shall bend cold through 180°.The internal diameter of the bend for the differentgrades of material shall be as given in Table 6. Thetest piece shall be deemed to have passed the test, ifthe outer convex surface is free from cracks.

9.2.3 It is some time difficult to ensure that thematerial is accurately following the radius. In caseof dispute, the test piece may be pushed into a blockoflead by a former of appropriate diameter.

Table 6 Bend Test Requirement for Hot Rolled SteelPlates, Sheets and strip

(Clause 9.2.2)

S. No.

(1) Designation

(2)

Internal Diameter of Bend Thickness

Up to and Including 12mm (3)

Above 12mm (4)

1 ISH290S Close 1t 2 ISH310S 1t 2t 3 ISH330S 1t 2t 4 ISH360S 1t 2t 5 ISH370S 1t 2t 6 ISH400S 1t 2t 7 ISH410S 1t 2t 8 ISH440S 1t 2t 9 ISH490S 2t 3t 10 ISH320LA Close 1t 11 ISH360LA Close 1t 12 ISH390LA Close 1t 13 ISH410LA 0.5t 2t 14 ISH430LA 1t 2t

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15 ISH450LA 1t 2t 16 ISH480LA 1t 2t 17 ISH500LA 1t 2t 18 ISH550LA 1.5t 2t 19 ISH600LA 1.5t 2t 20 ISH650LA 2t 3t 21 ISH700LA 2t 3t 22 ISH750LA 2t 3t 23 ISH440R 1t 2t 24 ISH490R 1.5t 2.5t 25 ISH540R 1.5t 2.5t 26 ISH590R 1.5t 2.5t 27 ISH780R 2t *

28 ISH440F 1t *

29 ISH540F 1.5t *

30 ÍSH590F 1.5t *

31 ISH540Y 1.5t *

32 ISH590Y 1.5t *

33 ISH780Y 2t *

34 ISH750MP * *

35 ISH980MP * *

36 ISH1180MS * *

Note: Where‗t‘ is the thickness of test piece. Restricted Internal diameter of the bend may be agreed between the purchaser and the manufacturer. * Properties on mutual agreement between the purchaser and the manufacturer. 10 IMPACT TEST

10.1 If agreed at the time of enquiry and stated in the order impact test shall normallybe carried out on products having thickness greater than or equal to 12 mm. The test specimen shall bemachined in such a way that the axis of the testspecimen is parallel to the direction of rolling andthe base closer to the roll surface is more than or equal to 1 mm from it. The notch axis shall beperpendicular to the roll surface. 10.2Under this standard, theaverage V-notch bar impact strength (average of3 tests carried out on 3 test pieces taken side by sidefrom the same product)

1) For grades ISH290S to ISH490S: shall not be less than 27J with no individual test value less than 18 J when tested at room temperature. 2) For grades ISH320LA to ISH750LA (High Strength Low Alloy – High yield ratio type steel): shall not be less than 40J with no individual test value less than 27 J when tested at -200C. More stringent values at room temperature and values at different temperature may be mutually agreed between the supplier and purchaser.

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10.3 If agreed at the time of enquiry and stated in the order impact tests may be carried out on products having thickness less than 12 mm, the dimensions of test piece shall be as specified inIS 1757. The average impact value required formaterial less than 12mm and more than 25 mm thick will be as per mutual agreement between thepurchaser and the manufacturer. 10.4 A test sample shall be taken from each heat. If different thicknesses have been rolled from slabs of a same heat, test sample shall be taken from the thickest products.If this thickest product test sample meets the requirement, all subsequent lower thicknesses rolled from the same cast / heat shall be deemed to satisfy the specification. If the sample does not meet the requirement, the test shall be carried out on the next thickest coil and so on.

11 RETEST

If a test does not give the specified results, twoadditional tests shall be carried out at random on thesame lot. Both retests shall confirm to the requirements ofthis standard; otherwise, individual test on each coil, (including any bundle of plates/sheets generated from a single coil) shall meet the requirement otherwise the individual lot shall be rejected. 12 ALTERNATE TEST METHOD

For all the tests specified in this standard (chemical/physical/others), the method as specified in relevant ISO, EN, ASTM and JIS Standard may also be followed on mutual agreement between supplier and purchaser. For Hole Expansion ratio test, the test method can be followed from any relevant ISO, EN, ASTM and JIS Standard. 13FREEDOM FROM DEFECTS

13.1 Sheets, strips, plates and flats shall be closelyrolled to the dimensions specified. The finishedmaterial shall be free from harmful defects and shallbe reasonably smooth and flat. Repair by weldingshall not be undertaken by the supplier without thepermission of the purchaser. 13.2 When the material is supplied in the form of coils, the degree or amount of surface defects are expectedto be more than in cut length sheets since theinspection of coils does not afford the sameopportunity to reject portion continuing defects aswith cut lengths. However, an excessive amount ofdefects may be a cause for rejection. 13.3 In case of plates, scale pits and other minorsurface defectsmay be removed by grinding, thedepth of grinding being such that the thickness ofthe plate shall not go below the specified value, atthe spot where dressing is done. The grinding shallbe even and smooth and shall be widened enough toremove sharp ridges. Dressing with a hammer or welding of defective spots shall not be permitted.

14 WELDABILITY

All steels complying with the standard are ofweldable quality. The material shall be suitable forgas welding, arc welding, spot welding and rollerseam welding. At the time of ordering, required welding if any shall be communicated.

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15 DIMENSIONS AND TOLERANCES

15.1 Unless otherwise agreed to between the supplier and purchaser,standard dimensions of hot rolled steel plates, sheets, strips and flats shall confirm to those given in IS 1730. 15.2 Unless otherwise agreed the dimensional tolerances for hot-rolled steel shall be as given in IS/ISO 16160 and IS1852 for plates from plate mill and also for sizes and tolerances not covered in IS/ISO 16160.

15.2.1 Unless otherwise agreed the restricted thickness tolerances shall be as given in IS/ISO 16160. 16CALCULATION OF MASS

Material shall be supplied on the basis of actual weight. If weighing is not possible, themass of the steel shall be calculated on the basis of steel density 7.85 grn/cm3. 17 DELIVERY

17.1 The material may be supplied in any one (or, in combination) of the following conditions subject to mutual agreement between the supplier and the purchaser:

a) Hot rolled, i) As Rolled, ii) Thermo mechanically Rolled, iii) Normalizing Rolling (Delivery condition is +N),

b) Annealed, c) Normalized, d) Pickled (Descaled), e) Pickled and Oiled, f) Skin Passed, g) Skin Passed and Oiled, and h) Shot blasted.

Unless and otherwise agreed, material shall be supplied in hot rolled condition (As rolled). 17.2 Subject to prior agreement between the manufacturer and the purchaser, a suitable protective treatment may be given to the material. 18 MARKING AND PACKING

18.1 Plates andSheets shall be supplied in bundles, and strips either in bundles or coils. Each bundle shall carry a metal tag or adhesive label/sticker bearing the cast number or identification mark or lot number traceable to the cast number and the manufacturer‘s name or trade mark. Alternatively, top sheet/plate or strips in each bundle shall be legibly marked with the cast number or identification mark or lot number traceable to the cast number, name of the manufacturer or trade mark.

18.2 Unless otherwise agreed the packing shall be adequate to ship the material safely and in good condition.

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The material may also be marked with the StandardMark.

18.3.1 The use of the Standard Mark is governedby the provisions of the Bureau of Indian

StandardsAct, 1986 and the Rules and Regulations madethereunder. The details of conditions under whichthe license for the use of the Standard Mark may begranted to manufacturers or producers may beobtained from the Bureau of Indian Standards. 19 ORDERING INFORMATION

While placing an order, the following are the minimuminformation to be specified by the purchaser:

a) Grade; b) Size; c) Mass of the material; d) Total order quantity; e) Marking instructions other than specified, if any; f) Restricted chemistry and or properties, if used for special purpose; g) Dimensional tolerances, if any special agreement to be made; and h) Supply condition (Edge condition, delivery conditions and type of oiling if any,etc).

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ANNEX 1

(Foreward)

S. No. Grade Designation Old Designation /

Equivalent Designation

1 ISH290S

Structural Steel

Grade 165 2 ISH310S - 3 ISH330S Grade 205 4 ISH360S Grade 235 5 ISH370S - 6 ISH400S - 7 ISH410S Grade 255 8 ISH440S - 9 ISH490S - 10 ISH320LA

High Strength Low Alloy – High yield ratio

type steel

IS 1079:2009 HR5-YST255 11 ISH360LA IS 1079:2009 HR5-YST305 12 ISH390LA - 13 ISH410LA IS 1079:2009 HR5-YST340 /

Grade 325 14 ISH430LA Grade 355 15 ISH450LA IS 1079:2009 HR5-YST380 16 ISH480LA Grade 420 17 ISH500LA IS 1079:2009 HR5-YST450 18 ISH550LA IS 1079:2009 HR5-YST500 /

Grade 490 19 ISH600LA Grade 560 20 ISH650LA - 21 ISH700LA - 22 ISH750LA - 23 ISH440R


- 24 ISH490R - 25 ISH540R - 26 ISH590R - 27 ISH780R - 28 ISH440F

Ferrite-Bainite Steel (Hole Expansion type)

- 29 ISH540F - 30 ÍSH590F - 31 ISH540Y

Dual Phase Steel -

32 ISH590Y IS 1079:2009 HR5-DP590 33 ISH780Y IS 1079:2009 HR5-DP780 34 ISH750MP

Multi Phase Steel -

35 ISH980MP - 36 ISH1180MS Martensitic Steel -

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For Comments Only


HOT ROLLED CARBON STEEL SHEET,PLATE

AND STRIP SPECIFICATION

(Seventh Revision)

ICS 77.140.50


BIS or used as a STANDARD comments is:

_________________________________________________________________________________

FOREWORD

This Indian Standard (Seventh Revision) was adopted by the Bureau of Indian Standards, after the

draftfinalized by the Wrought Steel Products Sectional Committee had been approved by the

MetallurgicalEngineering Division Council.

This standard was first published in 1958 and subsequently revised in 1962, 1968, 1973, 1988,

1994and 2009. While reviewing this standard, in the light of experience gained during these years,

theCommittee decided to revise it to bring in line with the present practices being followed by the

Indianindustry and overseas standards of hot rolled carbon steel sheets.

In this revision the following changes have been made:

a) Chemical composition has been modified;

b) Clauses3, 6.3, 8.3.2, 12, 13.3, 17.2 and 18 are added;

c)Clauses 1, 2, 5, 6.2, 8.1, 8.2, 9.1, and 16.1have been modified;

d) New grade designation system has been adopted for new included grades;

e) Grade HR5 has been removed and these grades are included in IS5986:2016 fourth

revision;

and

f) Clause 10 strain age test has been removed.

While revising the standard assistance has been derived from ISO 3573 - 'Hot rolled carbon

steelsheet of commercial and drawing qualities', JFS A1001 - ‘Hot rolled steel sheet and strip for automobile use’, JIS G3113 - ‘Hot rolled steel plate, sheet and strip for automobile structural uses’, and DIN EN10111 - ‘Continuously hot rolled low carbon steel sheet and strip for cold forming’.

For the purpose of deciding whether a particular requirement of this standard is complied with, the

finalvalue, observed or calculated, expressing the result of a test or analysis shall be rounded off

inaccordance with IS 2: 1960 'Rules for rounding off numerical values (revised). The number

ofsignificant places retained in the rounded off value should be the same as that of the specified

value inthis standard.

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1 SCOPE

This standard covers the requirements for hot rolled low carbon steel sheets, plates and strips

intended for drawing and forming in automobile and general engineering purposes.

2 REFERENCES

The following standards contain provisions, which through reference in this text, constitute

provisions of this standard. At the time of publication, the editions indicated were valid. All

standards are subject to revision and parties to agreements based on this standard are encouraged to

investigate the possibility of applying the most recent editions of the standards indicated below:

IS No. Title

228 (In- various parts) Method for chemical analysis of steel

1599 :2012 Method for bend test (second revision)

1608 : 2005 Metallic materials —Tensile testing at ambient temperature

(third revision)

1730 : 1989 Dimensions for steel plates, sheets, strips and flats for

general engineering purposes (second revision)

1956 Glossary of terms relating to iron and steel:

(Part 4) : 1975 Steel sheet and strip (firstrevision)

8910 :2010 General technical delivery requirements for steel and steel

products

10175 (Part 1) : 1993 Mechanical testing of metals—Modified Erichson cupping

test sheet and strip: Part 1 Thickness up to 2 mm

(firstrevision)

IS/ISO 16160 : 2005 Continuously hot-rolled steel sheet products —

Dimensional and shape tolerances

1852:1985Rolling and cutting tolerances for hot rolled steel products

(fourth revision)

3 TERMS AND DEFINITIONS

For the purpose of this standard, the definitions given in IS 1956 (Part 4) shall apply.


4.1General requirements relating to the supply of hot rolled carbon steel sheets and strips shall

conform to IS 8910.

4.2Hot rolled carbon steel sheets and strips shall be supplied either with mill edges or flattened and

shearedor trimmed/slitedges.

5DESIGNATION ANDGRADES

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There shall be 8 grades of hot rolled carbon steel sheetand strip designated as follows:


(Clause 5)

S. No. Grade Designation

i) HR0 Ordinary.

ii) HR1 Commercial Quality intended for general fabrication

purposes where sheets, or strips are used in the flat or for

bending, moderate forming and welding operations.

iii) HR2

General Purpose iv) HR3

v) HR4

vi) ISH270C

Drawing Quality vii) ISH270D

viii) ISH270E

Nomenclature for new designation and grades added;

ISH270C



Hot Rolled Steel

Indian Standard

6 MANUFACTURE

6.1 Steel shall be manufactured by any process of steel making at the discretion of the manufacturer.

6.2 Steel sheets, plates and strips shall be supplied in the rimmed, semi-killed or killed condition as

agreed to between the purchaser and the manufacturer. However,HR3, HR4, ISH270D

andISH270Eshall be supplied in killed condition only.

6.3 Subject to prior agreement between the manufacturer and the purchaser, a suitable protective

treatment may be given to the material. Applicable type of oiling is as per Table 2.

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(Clause6.3)

Type of Oiling As hot Rolled Pickling Skin Pass Shot blast

Normal Rust preventive Oil 1)

x √ x/√ √

Special Rust

preventive

Oil 2)

High Lubrication

rust preventive oil 3)

x √ x /√ x

Solid lubricant 4)

x √ x /√ x

No Oiling x x / √ x / √ x

1) Commonly used for steel strip, plate and sheet for rust prevention.

2) Special rust preventive oil is applied to the steel sheet, plate and strip with pickling finish.

3) The rust preventive oil in combined use as press oil and rust preventive oil. This kind of oil

shall be mutually agreed.

4) Solid lubricant is for better frictional properties during press work. This kind of

lubricantshall be mutually agreed.

NOTES:

1 Guarantee of rust prevention is depend on type of oil and quantity of oil. Purchaser should evaluate before confirming the oiling.

2For material ordered ―No Oiling‖, there is risk of rusting of steel. In that case, supplier has no responsibility if oxidation/rusting

occur.

7 CHEMICAL COMPOSITIONS

7.1 Ladle Analysis

Ladle analysis of the material when carried out either by the method specified in the relevant part of

IS 228 or any other established instrumental/chemical method, shall be as given in Table 3. In case of

dispute, the procedure given in the relevant part of IS 228 shall be the referee method.

7.2 Product Analysis

Permissible variations in case of product analysis from the limits specified in Table 3 shall be as

given in Table 4.

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Table 3 Chemical Composition

(Clauses 7.1 and 7.2)

Sl.

No.

(1)


Grade

(2)

Designation

(3)

C

(4)

Mn

(5)

P

(6)

S

(7)

i) HR0 Ordinary 0.25 2.00 0.080 0.050

ii) HR1 Commercial 0.15 0.60 0.050 0.035

iii) HR2 General

Purpose

0.10 0.45 0.040 0.035

iv) HR3 0.08 0.40 0.035 0.030

v) HR4 0.08 0.35 0.030 0.030

vi) ISH270C Drawing

Quality

0.08 0.45 0.035 0.035

vii) ISH270D 0.06 0.40 0.030 0.030

viii) ISH270E 0.06 0.35 0.025 0.025

NOTES:

1Steels of these grades can be supplied with the addition of micro-alloying elements like Boron, Titanium, Niobium and Vanadium. The micro

alloying elements shall not exceed 0.006percent in case of Boron and 0.2 percent in case of other elements.

2The nitrogen content of the steel shall not be more than 0.007 percent. For aluminium killed or aluminium silicon killed the nitrogen content

shall not exceed 0.012 percent.This has to be ensured by the manufacturer by occasional check analysis.

3 When the steel is Aluminium killed, the total Aluminium content shall not be less than 0.02 percent.Aluminium less than 0.02 percent can be

mutually agreed between the purchaser and supplier for Al killed steel.When the steel is silicon killed, the silicon content shall not be less than

0.10 percent. When the steel is Aluminium silicon killed, the silicon content shall not be less than 0.03 percent and total Aluminium content

shall not be less than 0.01 percent.

4 When copper bearing steel is required the copper content shall be between 0.20 and 0.35 percent.

5 Restricted chemical composition may be mutually agreed to between the purchaser and the supplier.

Table 4 Permissible Variations for Product Analysis

(Clause 7.2)

S. No.

(1)

Constituent

(2)

Percentage Limit of

Constituent

(3)

Variation Over Specified

Limit, Percent, Max

(4)

i) Carbon ≤0.15

>0.15

0.02

0.03

ii) Manganese

≤0.60

>0.60 to ≤1.15

>1.15

0.03

0.04

0.05

iii) Sulphur ≤ 0.05 0.005


>0.05

0.005

0.010

v) Silicon ≤0.60

>0.60

0.03

0.06

vi) Copper ≤0.35 0.03

vii) Micro Alloy - Subject to negotiation

Note – 1) Product analysis shall not be applicable to rimming steel.

2) For carbon content less than 0.10 %, variation over specified limit can be mutually agreed between

purchaser and manufacturer.

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8 TENSILE TEST

8.1 Number of Tensile Tests

One tensile test shall be taken from each cast.

8.1.1 Where plates, sheets and strips of more than one thickness are rolled from the same cast, one

additional tensile test shall be made from thematerial:

a) In the case of sheets and strips (for thickness <=5mm) - One sample shall be tested for

thickness<2.0mm, One sample shall be tested for thickness between ≥2.0 to <3.20mm and

One sample shall be tested forThickness ≥3.20mm.

b) In the case of plates and strips (for thickness >5mm) - For each variation thickness of 3

mm

c) from the thickness of test piece first selected.

8.2 Tensile Test Pieces

The sampling position of test piece shall be at a quarter-width from the edge of the sheet and strip. If

this is infeasible, the sampling should be made as close to the aforementioned position as possible.

Tensile test piece direction shall be cut transverse to the rolling direction. Longitudinal direction can

be taken with mutual agreement between supplier and purchaser. Selection of gauge length can also

be mutually agreed between supplier and purchaser.

8.3 Tensile Test

When tested in accordance with IS 1608 as applicable, the mechanical properties shall be as given in

Table 5A and 5B.

8.3.1 If the percentage elongation of any test piece is less than that specified in Table 5A and 5B, and

if any part of the fracture is outside the middle half of the gauge length as scribed before the test, the

test shall be discarded and a retest shall be carried out.

8.3.2 Additional product characteristicscan be agreed between the purchaser and supplier.

Table 5A Tensile Properties

(Clauses 8.3and 8.3.1)

S.

No.

Quality

Tensile

Strength 1),

max,

MPa

Percentage Elongation After Fracture A2), 3)

Min

Grade Old Grade and

Designation

t≤3 t>3

GL

Lo=80 mm

GL

Lo=50 mm

GL

Lo=5.65√So

GL

Lo=50mm

(1) (2) (3) (4) (5) (6) (7) (8)

i) HR0 Ordinary * * * * *

ii) HR1 Commercial 440 23 24 28 29

iii) HR2 General

420 25 26 30 31

iv) HR3 400 28 29 33 34

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v) HR4 Purpose 380 31 32 36 37

Table 5B Tensile Properties

(Clauses 8.3and 8.3.1)

S.

No.

Quality Yield Strength (Yield

Point/Proof Stress), Mpa#

Tensile

Strength,

MPa

Percentage Elongation After Fracture A2), 3)

Min#

Grade Designation

t < 2 2<t<3.2 t ≥ 3.2

t < 2 2<t<3.2 t ≥ 3.2 t≤3 t>3

GL

Lo=50 mm

GL

Lo=80 mm

GL

Lo=5.65√So

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)

i) ISH270C

Drawing

Quality

170min 270-420 26 26 31 25 30

ii) ISH270D 170min 165min 270-400 29 29 34 28 33

iii) ISH270E 165

min 155min 145min 270-380 32 32 37 31 36

Notes: 1)

1Mpa = 1N/mm2

2) Tensile testing is not mandatory for HR1, unless agreed to between the purchaser and

supplier.

1) Minimum tensile strength for qualities HR1, HR2, HR3 and HR4 would normally be expected to be 270Mpa. Where minimum

tensile strength is required, the value of 270Mpa may be specified. All tensile strength values are determined to the nearest 10Mpa.

2) The non-proportional test piece with a fixed gauge length (50mm), up to 5 mm thickness can be used in conjunction with a

conversion table in accordance with IS 3803. In case of dispute, however, only results obtained on a proportional test piece will be

valid for material over 3 mm in thickness.

3) Where, ‗t‘ is thickness,GL (L0) = Gauge Length, and So-Original cross-sectional area of gauge length.

4) The yield stress values apply to the 0.2 percent proof stress, if the yield stress is not clearly distinctive, otherwise the values apply to

the lower yield stress.

* Properties on mutual agreement between the purchaser and the manufacturer.

# Maximum values on YS and Elongation and/or restricted properties may be agreed between purchaser and manufacturer.

9 BEND TEST

9.1 Number of Bend Tests

One bend test shall be taken from each cast.

9.1.1 Where plates, sheets and strips of more thanone thickness are rolled from the same cast,

oneadditional bend test shall be made from the followingmaterial:

a) In the case of sheets and strips (for thickness <=5mm) - One sample shall be tested for

thickness<2.0mm, One sample shall be tested for thickness between ≥2.0 to <3.20mm and One sample shall be tested for Thickness ≥3.20mm.

b) In the case of plates and strips (for thickness >5mm) - For each variation thickness of 3

from the thickness of test piece first selected.

9.2 Bend test shall be carried out in accordance with IS 1599.

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9.2.1 Bend test piece shall be cut so that the axis of the bend is parallel to the direction of rolling, that

is, the longer axis of the test piece shall be at 90° to the direction of rolling.

9.2.2 The test piece shall be bent cold through 180°. The internal diameter of the bend for different

grades of material shall be as given in Table 6. The test pieces shall be deemed to have passed the

test if the outer convex surface is free from cracks after complete bending.

9.2.3It is sometimes difficult to ensure that the material is accurately following the radius. In case of

dispute, the test piece may be pushed into a block of lead by a former of appropriate diameter.

Table 6 Internal Diameter of Bend

(Clause 9.2.2)

S. No. Designation Internal Diameter of Bend

i) HR0 *

ii) HR1 2t

iii) HR2 1t

iv) HR3 Close

v) HR4 Close

vi) ISH270C 1t

vii) ISH270D Close

viii) ISH270E Close

Note: Where‗t‘ is the thickness of test piece.

Restricted Internal diameter of the bend may be agreed between the purchaser and the manufacturer.

* Bend test is not mandatory for HR0, however may be mutually agreed between the purchaser and

the manufacturer.

10 CUPPING TEST

10.1 Cupping test as specified in IS 10175 (Part 1) may be carried out only for sheets and strips of

HR2, HR3, HR4, ISH270C, ISH270D and ISH270Egrades having thickness from 0.5 mm up to 2

mm, if agreed to between the purchaser and the supplier.

10.2 The cupping test values shall be agreed upon between the purchaser and the supplier.

11 RETEST

If a test does not give the specified results, two additional tests shall be carried out at random on the

same lot. Both retests shall conform to the requirements of this standard; otherwise, individual test on

each coil, (including any bundle of plates/sheets generated from a single coil) shall meet the

requirement otherwise the individual lot shall be rejected.

12 ALTERNATE TEST METHOD

For all the tests specified in this standard (chemical/physical/others), the method as specified in

relevant ISO, EN, ASTM and JIS Standard may also be followed on mutual agreement between

supplier and purchaser.

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13.1 The finished material in cut length shall be free from harmful defects which will affect the end

use. When the material is supplied in the form of coils, the degree or amount of surface defects are

expected to be more than in cut length sheets since the inspection of coils does not afford the same

opportunity to reject the portion containing defects as with cut length. However, an excessive number

of defects may be the cause for rejection. The standards for acceptance in such case can be agreed to

between the purchaser and the supplier.

13.2 Edges may be mill edges or slit edges as agreed to between the supplier and purchaser. When

mill edges are specified, the depth of the defects shall be within 5 mm from the edges of the coils on

both sides.

13.3 In case of sheets, plates or strip, scale pits and other minor surface defects may be removed by

grinding, the depth of grinding being such that the thickness of the plate shall not go below the

specified value, at the spot where dressing is done. The grinding shall be even and smooth and shall

be widened enough to remove sharp ridges. Dressing with a hammer or welding of defective spots

shall not be permitted.

14 DIMENSIONS AND TOLERANCES

14.1 Unless otherwise agreed to between the supplier and the purchaser,standard dimensions of hot

rolledsteel sheet, plate and strip shall be as specified in IS 1730.

14.2 Unless otherwise agreed the dimensional tolerances for hot-rolled steel sheet, plate and strip

shall be as given in IS/ISO 16160 and IS1852 for plates from plate mill and also for sizes and

tolerances not covered in IS/ISO 16160.

14.2.1 Unless otherwise agreed the restricted thickness tolerances shall be as given in IS/ISO 16160.

15 CALCULATION OF WEIGHT

Material shall be supplied on the basis of actual weight. If weighing is not possible, the mass of the

material shall be calculated on the basis that steel weighs 7.85 g/cm2.

16 DELIVERY

16.1 The material may be supplied in any one (or, in combination) of the following conditions

subject to mutual agreement between the supplier and the purchaser:

a) Hot rolled

- As Rolled,

- Normalizing Rolling (Delivery condition is +N),

b) Annealed,

c) Normalized,

d) Pickled (Descaled),

e) Pickled and Oiled,

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f) Skin Passed,

g) Skin Passed and Oiled, and

h) Shot blasted.

Unless and otherwise agreed, material shall be supplied in hot rolled condition (As rolled).

16.2 Subject to prior agreement between the manufacturer and the purchaser, a suitable protective

treatment may be given to the material.

17 MARKING AND PACKING

17.1 Plates andSheets shall be supplied in bundles, and strips either in bundles or coils. Each

bundleshall carry a metal tag or adhesive label/sticker bearing the cast number or identification mark

or lot number traceable to the cast number and the manufacturer‘s name or trade mark. Alternatively, top sheet/plate or strips in each bundle shall be legibly marked with the cast number or identification

mark or lot number traceable to the cast number, name of the manufacturer or trade mark.

17.2 Unless otherwise agreed the packing shall be adequate enough to ship the material safe and in

good condition.


The material may also be marked with the Standard Mark.

17.3.1 The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards

Act, 1986 and the Rules and Regulations made there under. The details of conditions under which the

license for the use of Standard Mark may be granted to manufacturers or producers may be obtained

from the Bureau of Indian Standards.

18 ORDERING INFORMATION

While placing an order, the following are the minimum information to be specified by the purchaser:

a) Grade;

b) Size;

c) Mass of the material;

d) Total order quantity;

e) Marking instructions other than specified, if any;

f) Restricted chemistry and or properties, if used for special purpose;

g) Dimensional tolerances, if any special agreement to be made; and

h) Supply condition (Edge condition, delivery conditionsand type of oiling if any,etc).

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For Comments Only


HOT-ROLLED CARBON STEEL STRIP FOR COLD

ROLLING PURPOSES — SPECIFICATION

( Second Revision )

ICS 77.140.50


BIS or used as a Standard comments is:

FOREWORD

This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the draft

finalizedby Wrought Steel Products Sectional Committee had been approved by the Metallurgical

Engineering DivisionCouncil.

This standard was first published in 1985and subsequently revised in 2011. While reviewing this

standard, in the light of experience gainedduring these years, the Committee decided to revise it to

bring in line with that present practices beingfollowed by the Indian industry.

In this revision the following changes have been made:

a)Chemical composition has been modified for CR0, CR1, CR2 and CR4;

b) Clauses 1, 4, 6.1 and 6.2have been modified; Clause 5.1.2 has been removed.

c) New steel types like Interstitial Free-High Strength steel, Bake Hardening steel, Re-Phosphorized

steel, Dual Phase steel, TRIP steel, Complex Phase steel, Martensitic steel, and Hot Forming steel

have been added and new designations for the same are aligned with IS 513: 2016 ‘Cold reduced low carbon steel sheets and strips of part 1 & part 2’, as these are intended for cold rolling purposes;

For all the tests specified in this standard (chemical/physical/others), the method as specified in

relevant ISO, ASTM, EN and JISStandard may also be followed as an alternate method.

While revising the standard assistance has been derived from IS 513: 2016 ‘Cold reduced low carbon steel sheets and strips of part 1 and part 2’.

It is intended to cover medium and high carbon steel strip under a separate standard.

For the purpose of deciding whether a particular requirement of this standard is complied with, the

final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in

accordance withIS 2 : 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained inthe rounded off value should be the same as that of the specified value in

this standard.

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1 SCOPE This standard covers the requirements for hot-rolled carbon steel strips having carbon content up to a

maximum of 0.35 percent and intended for cold rolling.

2 REFERENCES

The following standards contain provisions which through reference in this text, constitute provisions

of this standard. At the time of publication, the editions indicated were valid. All standards are subject

to revision and parties to agreements based on this standard are encouraged to investigate the

possibility of applying the most recent editions of the standards indicated below:

IS No. Title

228 (in various parts) Method for chemical analysis of steel

1599 :2012 Method for bend test (second revision)

1608 : 2005 / ISO 6892Metallic materials – Tensile testing at ambient

temperature(third revision)

1730 : 1989 Dimensions for steel plates, sheets and strips and flats for

general engineering purposes (second revision)

8910 : 2010 General technical delivery requirements for steel and steel

products

1956 (Part 4) : 1975 Glossary of terms related to iron and steel: Part 4 Steel

sheet and strip (first revision)

10175 (Part 1) : 1993 Mechanical testing of metals – Modified Erichsen cupping

test – Sheet andstrip: Part 1 Thickness up to 2 mm

(firstrevision)

IS/ISO 16160 :2005 Continuously hot-rolled steel sheet products –

Dimensional and shape tolerances

3 SUPPLY OF MATERIAL 3.1 General requirements relating to the supply ofhot-rolled carbon steel strips shall conform to IS

8910.

3.2Hot-rolled carbon steel strip shall be supplied in coil form either with mill edges or sheared (slit)

edges as agreed to between the manufacturer and the purchaser.

3.3The material shall be supplied on the chemical composition basis as given in Table 1.

NOTE — The hardness values of the material may be provided, if agreed to between the manufacturer and the purchaser.

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4DESIGNATIONS There shall be sixteen designations of hot-rolled carbon steel strip as follows:

S. No. New Designation & Name

Grade Designation

i) CR0 Hard quality

ii) CR1 Commercial quality

iii) CR2 Drawing quality

iv) CR3 Deep drawing quality

v) CR4 Extra deep drawing aluminium

killed

vi) CR5 Extra deep drawing (stabilized

interstitial free)

vii) CR6 High Strength Low Alloy steel

viii) CR7 C-Mn steel and High Strength

steel

ix) CR8 Interstitial Free-High Strength

steel

x) CR9 Bake hardening steel

xi) CR10 Re-Phosphorized steel

xii) CR11 Dual Phase steel

xiii) CR12 Trip steel

xiv) CR13 Complex phase steel

xv) CR14 Martensitic steel

xvi) CR15 Hot Forming steel

5 MANUFACTURE

5.1 Strip shall be made from steel manufactured bythe open hearth, electric, duplex, basic oxygen or a

combination of these processes. In case any other process is employed by the manufacturer, prior

approval of the purchaser should be obtained.

5.1.1CR0 and CR1 grade strips may be supplied rimmed, semi-killed, killed or as agreed to between

the purchaser and the manufacturer. However, other grades shall be supplied only in fully killed

condition. CR4 and CR5 grade strips shall be supplied only in fully aluminium killed condition.

6 CHEMICAL COMPOSITION 6.1 Ladle analysis of the material, when carried out either by the method specified in the relevant parts

of IS 228 or any other established instrumental/ chemical method shall be as given in Table 1. In case

of dispute the procedure given in the relevant part of IS 228 shall be the referee method.

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Table 1 Chemical Composition (Clauses 3.3 and 6.1)

S.

No.

(1)

Designation

(2)

Grade

(3)

Constituent, Percent, Max

C

(4)

Mn

(5)

S

(6)

P

(7)

Micro-Alloy

(8)

i) CR0 Hard quality 0.35 4.00 0.045 0.05* -

ii) CR1 Commercial quality 0.15 1.00 0.040 0.080 -

iii) CR2 Drawing quality 0.12 0.50 0.035 0.040 -

iv) CR3 Deep drawing

quality 0.10 0.45 0.030 0.030 -

v) CR4 Extra deep drawing

aluminum killed 0.08 0.45 0.030 0.030 -

vi) CR5 Extra deep drawing

(stabilized

interstitial free)

0.06 0.25 0.020 0.020 0.15

vii) CR6 High Strength Low

Alloy steel 0.18 3.00 0.025 0.070 0.20

viii) CR7 C-Mn steel and

High Strength Steel 0.25 2.50 0.030 0.050 0.15

ix) CR8 Interstitial Free-

High Strength steel 0.01 1.60 0.025 0.120 -

x) CR9 Bake hardening

steel 0.04 1.40 0.020 0.120 -

xi) CR10 Re-Phosphorized

steel 0.12 1.20 0.030 0.100 -

xii) CR11 Dual Phase steel 0.30 4.00 0.020 0.100 -

xiii) CR12 Trip steel 0.35 2.50 0.015 0.100 -

xiv) CR13 Complex phase steel 0.20 3.50 0.015 0.100 -

xv) CR14 Martensitic steel 0.30 4.00 0.015 0.100 -

xvi) CR15 Hot Forming steel 0.32 2.00 0.015 0.050 -

NOTES:

1 Steels of these grades can be supplied with the addition of Micro-Alloy elements like boron, titanium, niobium andvanadium. The

micro-alloying elements shall not exceed 0.006 percent in case of boron and 0.25 percent in case of other elements.The elements (e.g Cr,

Mo, Ni, etc) not mentioned in above table can be added either singly or in combination.

2The nitrogen content of the steel shall not be more than 0.007 percent. For aluminium killed or silicon-aluminium killed, thenitrogen

content shall not exceed 0.012 percent. This shall be ensured by the manufacturer by occasional check analysis.

3When the steel is Aluminium killed, the total Aluminium content shall not be less than 0.02 percent.Aluminium less than 0.02 percent

can be mutually agreed between the purchaser and supplier for Al killed steel. When the steel is silicon killed, the silicon content shall

not be less than 0.10 percent. When the steel is Aluminium silicon killed, the silicon content shall not be less than 0.03 percent and total

Aluminium content shall not be less than 0.01 percent.

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4When copper bearing steel is required the copper content shall be between 0.20 and 0.35 percent.

5 Restricted chemistry may be mutually agreed to between the purchaser and the supplier.

6 Designation from CR5 to CR15, depends on the strength of the cold rolling final grade, Chemical composition may be agreed to

between the purchaser and the supplier.

*Phosphorus limit of 0.12 % Maximum can be added and in such cases, carbon content shall be limited to 0.15 % Maximum.

6.2 Product Analysis Permissible variation in case of product analysis from the limits specified in Table 1 shall be as given

in Table 2.

NOTE — Product analysis shall not be applicable to rimming steel.

Table 2 Permissible Variation for Product Analysis

(Clause 6.2)

S.

No.

(1)

Constituent

(2)

Percentage Limit of

Constituent

(3)

Permissible Variations over

Specified Limit, Percent, Max

(4)

i) Carbon ≤0.15

>0.15

0.02

0.03

ii) Manganese

≤0.60

>0.60 to ≤1.15

>1.15

0.03

0.04

0.05

iii) Sulphur ≤ 0.05 0.005


>0.05

0.005

0.010

v) Silicon ≤0.60

>0.60

0.03

0.06

vi) Copper ≤0.35 0.03

vii) Micro Alloy - Subject to negotiation

NOTES:

1 Product analysis shall not be applicable to rimming steel.

2 For carbon content less than 0.10 percent, variation over specified limit can be mutually agreed

between purchaser and manufacturer.

7 RETEST If a test does not give the specified results, two additional tests shall be carried out at random on the

same lot. Both retests shall conform to the requirements of this standard; otherwise, the lot shall be

rejected.

8 FREEDOM FROM DEFECTS The steel shall be free from amounts of segregation, laminations, surface flaws and other defects

which are detrimental to subsequent processing and ultimate use. The degree or amount of surface

defects in a coil may be expected to be more than in cut lengths because of the impossibility of

rejecting the portions of a coil. This shall be taken into account by the purchaser in his assessment of

the material. An excessive amount of defects may be the cause for rejection.

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9 DIMENSIONS AND TOLERANCES 9.1 Unless otherwise agreed to between the supplier and the purchaser,standard dimensions of hot

rolled steel strip shall be as specified in IS 1730. 9.2 Unless otherwise agreed the thicknesstolerances shall be as per IS/ISO 16160.

9.3 Crown Crown is the difference in strip thickness from centre to edge.

Crown = tc – (t1+t2)/2

where

tc= thickness at centre of the strip width; and

t1and t2= thicknesses measured at 40 mminside of the 2 edges. The crown of the hot-rolled mill edge steel strip meant for cold rolling shall be as follows:

For width up to and including 500 mm : - 0/ + 0.10 mm

For width above 500 mm : - 0/ + 0.15 mm

9.3.1 The difference in thickness across width atthe two edges of slit strip shall not exceed the limits

given below:

Nominal Thickness, mm Tolerance on Thickness Over Two Edges, mm

From Upto and Including

- 3 0.06

3 8 0.08 9.4 Permissible Width Variations The permissible tolerance on the nominal width of hot-rolled strip shall conform to the requirements

specified in IS/ISO 16160.

9.5 Edge Camber The edge camber tolerance shall be as indicated below:

Nominal Width, mm Measured Length, mm Camber, mm

From Up to and Including Mill Edge Slit Edge

10 40 2500 20 20

40 600 2500 10 10

600 2000 2500 25 15

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9.6 Any special tolerances to suit specificrequirements shall be mutually agreed to between the

manufacturer and the customer.

10 CALCULATION OF WEIGHT Material shall be supplied on the basis of actual weight. If weighing is not possible, the mass of the

material shall be calculated on the basis that steel weighs 7.85 g/cm2.

11 DELIVERY 11.1 The material shall be supplied in coil form in hot-rolled condition. The mass of the coil shall be as

agreed to between the contracting parties. 11.2 The material shall be firmly strapped to prevent damage during transit.

12 MARKING 12.1 Each strip/coil shall carry a metal tag or adhesive label/sticker bearing the cast number or

identification mark or lot number traceable to the cast numberand the manufacturer’s name or trade-

mark or shall be legibly marked at top.

12.2 BIS Certification Marking The material may also be marked with the Standard Mark. 12.2.1 The use of the Standard Mark is governedby the provisions of the Bureau of Indian

StandardsAct, 1986 and the Rules and Regulations madethere under. The details of conditions under

which the license for the use of the Standard Mark may be granted to manufacturers or producers may

be obtained from the Bureau of Indian Standards.

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