Materials Technical Specification.

Transcription

1 Materials Technical Specification. STAINLESS STEEL TYPE X2CrNiMo (1.4404, AISI 316L) November 13,

2 Contents 1 GENERAL Applications 3 2 APPLICABLE DOCUMENTS 3 3 GENERAL CHARACTERISTICS CHEMICAL COMPOSITION PROPERTIES Structure Inclusions Mechanical Magnetic MANUFACTURING PROCESS 5 5 QUALITY CONTROL GENERAL HOMOGENEITY CONDITIONS OF DELIVERY MARKING DOCUMENTS PACKING 6 2

3 STAINLESS STEEL - Type X2CrNiMo (1.4404, AISI 316L) 1 GENERAL Applications This specification relates to type X2CrNiMo (1.4404, AISI 316L) stainless steel for the production of sheet steel or tubing. 2 APPLICABLE DOCUMENTS Reference is made in this specification to the documents below: EN (1995) Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip for general purposes EN (1991) Metallic products: Types of inspection documents ASTM E45-97e1 (1997) Standard practice for determining the inclusion content of steel ASTM E (1996) Standard method for determining average grain size EN (1993) General technical delivery requirements for steel and steel products pren (1998) Ultrasonic testing of steel flat product of thickness equal to or greater than 6 mm (reflection method) 3

4 STAINLESS STEEL - Type X2CrNiMo (1.4404, AISI 316L) 3 GENERAL CHARACTERISTICS 3.1 CHEMICAL COMPOSITION Element Content wt% Cr * Ni * C max. Si 1.00 max. Mn 2.00 max. Mo N max.* P max.* S 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 Structure The structure after full quenching shall be completely austenitic. In accordance with the standard ASTM E112-96, grain size 40µm shall be accepted Inclusions Amount and definition 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 extent of 2% of the fields counted. 4

5 STAINLESS STEEL - Type X2CrNiMo (1.4404, AISI 316L) Mechanical After solution annealing: At C At 150 C Tensile strength Rm [MPa] min Yield stress Rp 0.2% [MPa] min Young s modulus E [GPa] min Elongation at break A5 [% ] min. 35 Brinell hardness HB max Magnetic The relative magnetic permeability after solution annealing and at room temperature shall be lower than or equal to for fields of over 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 and inclusion 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 2B according to EN QUALITY CONTROL 5.1 GENERAL Quality control shall be carried out in accordance with a quality plan established 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 detect continuity faults after the last hot working operation. The details of the ultrasonic inspection will be agreed upon between the manufacturer and NIKHEF as a function of the product. 5

6 5.3 CONDITIONS OF DELIVERY Quality to be guarantied at delivery. Quality control has to be done to the standards in force. Test Chemical analysis Structural analysis (structure/inclusions) Ultrasonic Mechanical properties Dimensions Magnetic permeability Frequency Every melt Every ingot at head, centre and foot By sampling on the steel sheet and tubing Each steel sheet and tube Every ingot and by sampling on steel sheet and tubing Each thickness 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: ˆ the designation of the steel and the reference of the standard or of the specification, ˆ the identification marks of the part or of the batch and of the heat, ˆ the Producer s name or symbol, ˆ where applicable, the stamp of the acceptance agent or of the controller of the producing plant. For small-size parts, the above identification marks may be replaced by a single mark codified by the Producer and transferred on the acceptance documents. These markings are to be made on one side only. b) The markings shall be applied using a process which eliminates any risk of notching or chemical attack. 5.5 DOCUMENTS The supplier shall attach the analysis certificates issued following the qualification controls given in Chapter 5.3 above to each consignment. All these certificates 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 the surface condition and evenness during transport. 6