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Materials Technical Specication.

STAINLESS STEEL

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

November 13, 2003

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Contents

1 GENERALApplications 3

2 APPLICABLE DOCUMENTS 3

3 GENERAL CHARACTERISTICS 43.1 CHEMICAL COMPOSITION . . . . . . . . . . . . . . . . . . . . 43.2 PROPERTIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.2.1 Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.2.2 Inclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.2.3 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . 53.2.4 Magnetic . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 MANUFACTURING PROCESS 5

5 QUALITY CONTROL 55.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.2 HOMOGENEITY . . . . . . . . . . . . . . . . . . . . . . . . . . 55.3 CONDITIONS OF DELIVERY . . . . . . . . . . . . . . . . . . . 65.4 MARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.5 DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6 PACKING 6

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

1 GENERALApplications

This specication relates to type X2CrNiMo12-12-2 (1.4404, AISI 316L) stain-less steel for the production of sheet steel or tubing.

2 APPLICABLE DOCUMENTS

Reference is made in this specication 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 inspection docu-ments

ASTM E45-97e1 (1997) Standard practice for determining the inclu-sion content of steel

ASTM E112-96 (1996) Standard method for determining averagegrain size

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

prEN 10160 (1998) Ultrasonic testing of steel at product of thick-

ness equal to or greater than 6 mm (reectionmethod)

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3 GENERAL CHARACTERISTICS

3.1 CHEMICAL COMPOSITIONElement 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 - 2.50N 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 StructureThe structure after full quenching shall be completely austenitic. In accordancewith the standard ASTM E112-96, grain size 40 m shall be accepted.

3.2.2 Inclusions

Amount and denition shall meet standard ASTM E45-97e1, method D.The class of inclusions shall be at most 2.The tolerance for acceptance may be a half-class above the set limit to the extentof 2% of the elds counted.

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3.2.3 Mechanical

After solution annealing:

At 20 25 C At 150 CTensile strength Rm [MPa] min. 585 525Yield stress Rp 0.2% [MPa] min. 260 230Youngs modulus E [GPa] min. 200 186Elongation at break A5 [% ] min. 35Brinell hardness HB max. 180

3.2.4 Magnetic

The relative magnetic permeability after solution annealing and at room tem-perature shall be lower than or equal to 1.005 for elds of over 80 000 A/m(equivalent to 1000 Oe).

4 MANUFACTURING PROCESS

The manufacturer shall state the method of processing or rening of the steelwhich they intend to use to obtain the rate of inclusions specied under struc-tural and inclusion properties.

The sheet steel must be cold-rolled and annealed,

The tube steel must be cold-rolled or drawn and annealed.

The nishing of the sheets and tubes must be of type 2B according to EN10088-2.

5 QUALITY CONTROL

5.1 GENERAL

Quality control shall be carried out in accordance with a quality plan estab-lished between the manufacturer and NIKHEF. NIKHEF (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 ultra-sonic inspection will be agreed upon between the manufacturer and NIKHEFas a function of the product.

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5.3 CONDITIONS OF DELIVERY

Quality to be guarantied at delivery. Quality control has to be done to thestandards in force.

Test FrequencyChemical analysis Every meltStructural analysis Every ingot at head, centre and foot(structure/inclusions) By sampling on the steel sheet and tubingUltrasonic Each steel sheet and tubeMechanical properties Every ingot and by sampling on steel sheet

and tubingDimensions Each thicknessMagnetic permeability Every ingot and by sampling on steel sheet

and tubing

5.4 MARKING

a) Unless agreed otherwise, the following marks are applied to each part:

the designation of the steel and the reference of the standard or of the specication,

the identication marks of the part or of the batch and of the heat, the Producers name or symbol, where applicable, the stamp of the acceptance agent or of the con-

troller of the producing plant.

For small-size parts, the above identication marks may be replaced by asingle mark codied by the Producer and transferred on the acceptancedocuments.These markings are to be made on one side only.

b) The markings shall be applied using a process which eliminates any riskof notching or chemical attack.

5.5 DOCUMENTS

The supplier shall attach the analysis certicates issued following the quali-cation controls given in Chapter 5.3 above to each consignment. All thesecerticates shall be drawn up in accordance with the prevailing standards.

6 PACKING

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

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