propriendades aisi 316l bellows english

8/17/2019 Propriendades AISI 316L Bellows English

1/6

CERN

Materi al s Technical Specifi cati on (SPL -LS)

TECHNICAL SPECIFICATIONN° 525 - Ed. 3 - 02.08.1999

SHEETS AND TUBING

FOR SPECIAL CRYOGENIC APPLICATIONS

STAINLESS STEEL

TYPE X2CrNiMo17-12-2 (1.4404, AISI 316L)


2/6

SHEETS AND TUBING FOR SPECIAL CRYOGENIC APPLICATIONS 2

STAINLESS STEEL - Type X2CrNiMo17-12-2 (1.4404, AISI 316L)

---------------------------------------------------------------------------------------

../…

C O N T E N T S

1. GENERAL

APPLICATIONS

2. APPLICABLE DOCUM ENTS

3. GENERAL CHARACTERISTICS

3.1 CHEMICAL COMPOSITION

3.2 PROPERTIES

3.2.1 Structure3.2.2 Inclusions3.2.3

Mechanical3.2.4 Magnetic

4. MANUFACTURING PROCESS

5. QUALI TY CONTROL

5.1 GENERAL

5.2 HOMOGENEITY

5.3 QUALIFICATION CONTROL

5.4 IDENTIFICATION

5.5 DOCUMENTS

6. PACKING


3/6



---------------------------------------------------------------------------------------

../ …

1. GENERAL

APPLICATIONS

This specification relates to type X2CrNiMo12-12-2 (1.4404, AISI 316L) stainless steelfor the production of sheet steel or tubing for special cryogenic applications (bellowsetc.).

2. APPLICABLE DOCUMENTS

Reference is made in this specification to the documents below:

EN 10088-2 (1995) Stainless steels - Part 2: Technical deliveryconditions for sheet/plate and strip for generalpurposes

EN 10204 (1991) Metallic products: Types of inspectiondocuments

ASTM E45-97e1 (1997) Standard practice for determining theinclusion content of steel

ASTM E112-96 (1996) Standard method for determining average

grain size

EN 10021 (1993) General technical delivery requirements forsteel and steel products

prEN 10160 (1998) Ultrasonic testing of steel flat product ofthickness equal to or greater than 6 mm(reflection method)


4/6



---------------------------------------------------------------------------------------

../ …

3. GENERAL CHARACTERISTICS

3.1 CHEMICAL COMPOSITION

Element Content wt%

Cr 16.00 - 18.50*

Ni 11.00 - 14.00*

C 0.030 max.

Si 1.00 max.

Mn 2.00 max.

Mo 2.00 - 2.50

N 0.050 max.*

P 0.030 max.*

S 0.010 max*

Fe Remainder

* CERN requirement

Special requirements:

Cobalt shall be present only as a trace or to a maximum proportion of 0.20%,including measuring tolerance.

3.2 PROPERTIES

3.2.1 Structure

The structure after full quenching shall be completely austenitic. In

accordance with the standard ASTM E112-96, grain size

40

m shall beaccepted.

3.2.2 Inclusions

Amount and definition shall meet standard ASTM E45-97e1, method D.

The class of inclusions shall be at most 1.

The tolerance for acceptance may be a half-class above the set limit to theextent of 2% of the fields counted.


5/6



---------------------------------------------------------------------------------------

../ …

3.2.3 Mechanical

At room temperature, after solution annealing:

Tensile strength Rm min. 600 N/mm2

Yield stress Rp 0.2% min. 225 N/mm2

Elongation at break A5 min. 35%

Brinell hardness HB max. 180

At cryogenic temperature (4.2 K), after solution annealing:

Impact toughness KCV min. 80 J/cm2

3.2.4 Magnetic

The relative magnetic permeability after solution annealing and atroom temperature shall be lower than or equal to 1.005 for fields ofover 80 000 A/m (equivalent to 1000 Oe).

4. MANUFACTURING PROCESS

The manufacturer shall state the method of processing or refining of the steel which

they intend to use to obtain the rate of inclusions specified under "structural andinclusion properties".

The sheet steel must be cold-rolled and annealed,The tube steel must be cold-rolled or drawn and annealed.The finishing of the sheets and tubes must be of type “2D” according to EN 10088-2.

Surface quality must be confirmed by a dye penetrant test. Any defects detected must be discussed between CERN and the supplier.

5. QUALI TY CONTROL

5.1 GENERAL

Quality control shall be carried out in accordance with a quality planestablished between the manufacturer and CERN. CERN (or its representative)reserves the right to intervene during the different stages of fabrication.

5.2 HOMOGENEITY

The homogeneity of the steel shall be ultrasonically inspected solely to detectcontinuity faults after the last hot working operation.

The details of the ultrasonic inspection will be agreed upon between the

manufacturer and CERN as a function of the product.


6/6



---------------------------------------------------------------------------------------

../ …

5.3 QUALITY CONTROL (to the standards in force)

Test Frequency

Chemical analysis Every melt

Structural analysis

(structure/inclusions)

Every ingot at head, centre and foot

By sampling on the steel sheet and tubing

Ultrasonic Each thickness on steel sheet and tubing

Mechanical properties Every ingot and by sampling on steelsheet and tubing

Dimensions Each thicknessMagnetic permeability Every ingot and by sampling on steel

sheet and tubing

Penetrant test % on steel sheet and tubing

5.4 IDENTIFICATION

Each sheet or tube shall be marked with :

• heat N°• supplier's name• type of material

These markings are to be made on one side only. They must be easy to removewith solvents (such as acetone).

5.5 DOCUMENTS

The supplier shall attach the analysis certificates issued following thequalification controls given in § 5.3 above to each consignment.

All these certificates shall be drawn up in accordance with the prevailingstandards.

6. PACKING

The packaging of the sheets and tubes shall be strong enough to preserve the surfacecondition and evenness during transport.

propriendades aisi 316l bellows english

Documents