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है”ह”ह

IS 3024 (2006): Grain orinted electrical steel sheets andstrips [MTD 4: Wrought Steel Products]

AMENDMENT NO. 2 JUNE 2011 TO

IS 3024 : 2006 GRAIN ORIENTED ELECTRICAL STEEL SHEET AND STRIP

(Second Revision)

(Page 1, clause 3.14) — Substitute the following for the existing:

‘Side Trimmed Coil — Material is side trimmed on both edges condition in the range of widths produced by suppliers’ manufacturing process.’

[Page 2, clause 5.2(a)] — Substitute the following for the existing:

‘a) Conventional grain oriented electrical steel tested at 1.7 Tesla values of maximum specific core

losses are given in Table 1 and the values of maximum specific core losses at 1.5 Tesla given in Table 1 are for information only.’

[Page 3, Table 1 (see also Amendment No. 1)] — Substitute the following for the existing table: Price Group 2

1

Amend No. 2 IS 3024 : 2006

Table 1 Magnetic Properties of Conventional Grain Oriented (CGO) Electrical Steel (Clauses 4.2, 5.2, 8.1 and 8.2)

NOTES 1 The above samples are sheared longitudinal to the rolling direction and then stress relief annealed in a neutral or reducing atmosphere to develop magnetic property at 780°C to 820°C. 2 The values of Maximum Specific Core Loss (W/kg) at 1.5 T are for information only.

Grade

Nominal Thickness

mm

Maximum Specific Core Loss (W/kg) Polarization at 1.5 T and

50 Hz

Maximum Specific Core Loss (W/kg)

Polarization at 1.7 T and

50 Hz

Minimum Polarization in Tesla at a

Field Strength of 800 A/m

Minimum Stacking Factor

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

23CG110 0.23 0.73 1.10 1.78 0.945 23CG120 0.23 0.77 1.20 1.78 0.945 23CG127 0.23 0.80 1.27 1.75 0.945

27CG120 0.27 0.80 1.20 1.78 0.950 27CG130 0.27 0.85 1.30 1.78 0.950 27CG140 0.27 0.89 1.40 1.75 0.950

30CG130 0.30 0.85 1.30 1.78 0.955 30CG140 0.30 0.92 1.40 1.78 0.955 30CG150 0.30 0.97 1.50 1.75 0.955

35CG145 0.35 1.03 1.45 1.78 0.960 35CG155 0.35 1.07 1.55 1.78 0.960 35CG165 0.35 1.11 1.65 1.75 0.960

(Page 4, Table 2) — Substitute the following for the existing table:

Table 2 Magnetic Properties of High Permeability Grain Oriented (HPGO) Electrical Steel

(Clauses 5.2, 8.1 and 8.2) Grade

Nominal Thickness

mm

Maximum Specific Core Loss (W/kg)

Polarization at 1.7 T and 50 Hz

Minimum Polarization in Tesla at a

Field Strength of 800 A/m

Minimum Stacking Factor

(1) (2) (3) (4) (5) 23HP85 d 0.23 0.85 1.85 0.945 23HP90 d 0.23 0.90 1.85 0.945 27HP90 d 0.27 0.90 1.85 0.950 27HP95 d 0.27 0.95 1.85 0.950 27HP100 0.27 1.00 1.88 0.950 27HP110 0.27 1.10 1.88 0.950 30HP105 0.30 1.05 1.88 0.955 30HP110 0.30 1.10 1.88 0.955 35HP115 0.35 1.15 1.88 0.960 35HP125 0.35 1.25 1.88 0.960 35HP135 0.35 1.35 1.88 0.960 NOTES 1 d This grade may be delivered in domain refined condition. The magnetic properties of some domain refined material may deteriorate when the material is subjected to heat treatment. 2 The domain refined grades need to be checked by single sheet method as in clause 14.3.

(Page 4, Table 3, col heading 4) — Substitute ‘ohm–cm2 / Lamination’ for ‘ohm–cm2’.

(Page 5, clause 10.2) — Substitute the following for the existing

3

Amend No. 2 IS 3024 : 2006 ‘10.2 Ductility This test can be carried out by one of two methods described below. 10.2.1 The ductility shall be as high as practicable, when the application requires forming around a sharp radius during fabrication, an evaluation of the ductility is required. The ductility rating shall be determined in accordance with the test method described in IS 649. Ductility in following classes is typical for grain-oriented material in any thickness and surface type when tested at the room temperature with a bend transverse to the rolling direction with following sheared specimens:

Ductility Class Permissible Number of Fractures on Steel Base at Bend (see Note)

1 1 total length not over 8 mm 2 2 total length not over 15 mm 3 ≥ 3

NOTE — Based on 610 to 910 mm width of material. For widths less than 610 mm the number of permissible fractures should be reduced in proportion to the ratio of the width to 610 mm.

10.2.2 This alternate ductility test method is as described in IS 649 (Section 8, clauses 49 and 50). The minimum number of bends is one. The value applies to the parallel to the direction of rolling.’ (Page 5, clause 11.2) — Insert the following at the end: ‘ , for widths up to and including 1 000 mm. For materials supplied with as rolled edges and/or widths above 1 000 mm the tolerances on nominal width should be the subject of agreement while ordering.’

(Page 6, Table 5) — Substitute the following for the existing table

4

Amend No. 2 IS 3024 : 2006

Table 5 Width Tolerance (Clause 11.2)

Sl No. Nominal Width, l, mm Tolerances

(1) (2) (3) i) l ≤ 150 2.0

0.0+−

ii) 150 < l <300 3.00.0

+−

iii) 300 < l <600 5.00.0

+−

iv) 600 < l <1 000 0.10.0

+−

v) l >1 000 5.10.0

+−

NOTE — As per agreement, width Tolerance can be –ve or +ve or both –ve and +ve subject to tolerance band as given in above table. (Page 6, clause 14) — Insert the following as new subclauses at the end: ‘14.3 In the case where the measurement of magnetic polarization and specific core loss shall be made using single sheet method as specified in IS 649, the test specimen for the single sheet tester shall consist of one sheet having the following dimensions:

- Length 500 mm to 530 mm NOTE — The value of 500 mm is recommended.

- Width 500 mm + 0 / – 5 mm.

All the test specimens shall be cut parallel to the direction of rolling. The permitted tolerance for the angle between the direction of rolling and the direction of cutting is ±1 degree. 14.4 In case of measurements of specific core loss on aged test pieces, these shall be aged by heating at 2250C ± 50C for duration of 24 hours and shall be cooled to ambient temperature.’

5

Amend No. 2 IS 3024 : 2006 (Page 6, clause 15) — Insert the following as new subclause at the end: ‘15.4 The required tests for domain refined grades, core loss to determine the core loss type (and for exciting current and peak permeability, when determined) shall be made in accordance with the test method described in IS 649, by means of a single sheet tester.’

(MTD 4) Reprography Unit, BIS, New Delhi, India

6

AMENDMENT No. 3 NOVEMBER 2012TO

IS 3024 : 2006 GRAIN ORIENTED ELECTRICAL STEELSHEET AND STRIP

(Second Revision)

[Page 2, clause 5.2 (a) and (b) (see also Amendment No. 2)] — Substitutethe following for the existing:

‘a) Conventional grain oriented electrical steel tested at 1.7 Tesla and 50Hz values, maximum specific core losses are given in Table 1. The valuesof maximum specific core losses at 1.5 Tesla and 50 Hz;at 1.5Tesla and60Hz and at 1.7 Tesla and 60 Hz given in Table 1 are for information only.

b) High permeability grain oriented tested at 1.7 Tesla and 50 Hz,maximum specific core losses are given in Table 2. Maximum specificcore losses at 1.7 Tesla and 60 Hz given in Table 2 are for informationonly.’

(Page 2, clause 7.2) — Insert the following at the end of clause:

‘The additional thickness due to welds with respect to measured thickness ofthe steel sheet or strip shall not exceed 0.05 mm.’

[Page 3, Table 1 (see also Amendment No. 1 and 2)] — Substitute thefollowing table for the existing table:

1

Amend No. 3 to IS 3024 : 2006

Table 1 Magnetic Properties of Conventional Grain Oriented (CGO)Electrical Steel

(Clauses 4.2, 5.2, 8.1 and 8.2)

NOTES

1 The above samples are sheared longitudinal to the rolling direction and then stress reliefannealed in a neutral or reducing atmosphere to develop magnetic property at between 780°C to840°C, as recommended by the manufacturer.

2 The values of Maximum Specific Core Loss (W/kg) at 1.5 T are for information only.

3 The values of Maximum Specific Core Loss (W/kg) at 1.7 T and 60Hz are for informationonly.

2

Maximum SpecificCore Loss (W/kg)

Polarizationat 1.5 T

Maximum SpecificCore Loss (W/kg)

Polarizationat 1.7 T

Grade NominalThickness

mm

50 Hz 60 Hz 50 Hz 60 Hz

MinimumPolarizationin Tesla at a

Field Strengthof 800 A/m

MinimumStackingFactor

(1) (2) (3) (4) (5) (6) (7) (8)23CG110 0.23 0.73 0.96 1.10 1.45 1.78 0.94523CG120 0.23 0.77 1.01 1.20 1.57 1.78 0.945

23CG127 0.23 0.80 1.03 1.27 1.65 1.75 0.94527CG120 0.27 0.80 1.07 1.20 1.58 1.78 0.95027CG130 0.27 0.85 1.12 1.30 1.68 1.78 0.950

27CG140 0.27 0.89 1.15 1.40 1.75 1.75 0.95030CG130 0.30 0.85 1.15 1.30 1.71 1.78 0.95530CG140 0.30 0.92 1.21 1.40 1.83 1.78 0.95530CG150 0.30 0.97 1.25 1.50 1.90 1.75 0.95535CG145 0.35 1.03 1.36 1.45 1.91 1.78 0.96035CG155 0.35 1.07 1.45 1.55 2.04 1.78 0.960

35CG165 0.35 1.11 1.52 1.65 2.12 1.75 0.960

Amend No. 3 to IS 3024 : 2006

[Page 4, Table 2 (see also Amendment No. 2)] — Substitute the followingtable for the existing table:

Table 2 Magnetic Properties of High Permeability Grain Oriented (HPGO)Electrical Steel

(Clauses 5.2, 8.1 and 8.2)

NOTES1 d This grade may be delivered in domain refined condition . The magnetic properties of somedomain refined material may get deteriorate when material is subjected to heat treatment.2 In cases where material gets deteriorated when subjected to heat treatment The domain refinedgrades need to be checked by Single sheet method as given in 14.3. For other grades/other typeof domain refined grades which do not deteriorate when subjected to heat treatment, the testmethod remains as per EPSTEIN method as given in IS 649.3 The values of Maximum Specific Core loss (W/kg) at 60 Hz are for information only.

3

Maximum Specific CoreLoss (W/kg) Polarization

at 1.7 T

MinimumPolarizationin Tesla at a

Field Strengthof 800 A/m

MinimumStackingFactor

Grade NominalThickness

mm

50 Hz 60 Hz (5) (6)23HP85 d 0.23 0.85 1.12 1.85 0.94523HP90 d 0.23 0.90 1.19 1.85 0.94523HP95 d 0.23 0.95 1.25 1.85 0.945

23HP100 d 0.23 1.00 1.32 1.85 0.94527HP90 d 0.27 0.90 1.19 1.85 0.95027HP95 d 0.27 0.95 1.25 1.85 0.95027HP100 0.27 1.00 1.32 1.88 0.95027HP110 0.27 1.10 1.45 1.88 0.95030HP105 0.30 1.05 1.38 1.88 0.95530HP110 0.30 1.10 1.46 1.88 0.95530HP120 0.30 1.20 1.58 1.88 0.95535HP115 0.35 1.15 1.51 1.88 0.96035HP125 0.35 1.25 1.64 1.88 0.96035HP135 0.35 1.35 1.77 1.88 0.960

4Reprography Unit, BIS, New Delhi, India

(MTD 4)

820°C’.(Page 6 clause 14.2, line 4) — Substitute ‘780°C to 840°’C for ‘780°C to

.’mm0.040.025‘NOTE — Unless otherwise agreed the thickness tolerance for grade 23CG110 shall be

(Page 5, clause 11.1) — Insert the following Note at the end of clause:

(Page 4, clause 9.1, line 5 ) — Delete ‘and approximately’.

Amend No. 3 to IS 3024 : 2006