Chemical compositions of stainless steels to BS EN 10253-3 and 10253-4

Introduction

BS EN 10253-3 is the material standard for austenitic and duplex stainless steels for butt-welded fittings without specific inspection requirements.

BS EN 10253-4 is the material standard for austenitic and duplex stainless steels for butt-welded fittings with specific inspection requirements.

The compositions are the same in both standards. They differ in that part 4 has a comprehensive set of inspection requirements. The overall intention seems to be that part 4 makes the fittings suitable for pressure purposes. The extra requirements of part 4 include;

  • Definition of product making process - starting forms, hot and cold processing
  • Normal or enhanced wall thickness
  • Impact toughness values
  • Determination of pressure factors - formulae are given for calculating these and tables are provided for common fitting sizes

The types of product covered by the standards are:

  • Elbows
  • Concentric reducers
  • Eccentric reducers
  • Equal tees
  • Reducing tees
  • End caps

This article only includes chemical compositions.

As an alternative to scanning down the list try the 'find' facility on your keyboard, using the 'Ctrl' and 'F' keys together. Type in the term you are looking for in the dialog box that then appears.
The data given is not intended to replace that shown in individual standards to which reference should always be made.

BS EN 10253-3 and 10253-4 chemical composition tables

Designation Chemical composition (% by mass - max unless stated)
Steel name Steel number C Si Mn P S Cr Mo Ni Cu N Nb Ti
Austenitic stainless steels
X2CrNi18-9 1.4307 0.030 1.00 2.00 0.045 0.015 17.5/19.5 - 8.0/10.5 - 0.11 - -
X2CrNi19-11 1.4306 0.030 1.00 2.00 0.045 0.015 18.0/20.0 - 10.0/12.0 - 0.11 - -
X2CrNiN18-10 1.4311 0.030 1.00 2.00 0.045 0.015 17.0/19.5 - 8.5/11.5 - 0.12/0.22 - -
X5CrNi18-10 1.4301 0.07 1.00 2.00 0.045 0.015 17.0/19.5 - 8.0/10.5 - 0.11 - -
X6CrNiTi18-10 1.4541 0.08 1.00 2.00 0.045 0.015 17.0/19.0 - 9.0/12.0 - - - 5xC/0.70
X6CrNiNb18-10 1.4550 0.08 1.00 2.00 0.045 0.015 17.0/19.0 - 9.0/12.0 - - 10xC/1.00 -
X1CrNi25-21 1.4335 0.020 0.25 2.00 0.025 0.010 24.0/26.0 0.20 20.0/22.0 - 0.11    
X2CrNiMo17-12-2 1.4404 0.030 1.00 2.00 0.045 0.015 16.5/18.5 2.00/2.50 10.0/13.0 - 0.11 - -
X5CrNiMo17-12-2 1.4401 0.07 1.00 2.00 0.045 0.015 16.5/18.5 2.00/2.50 10.0/13.0 - 0.11 - -
XCrNiMoTi17-12-2 1.4571 0.08 1.00 2.00 0.045 0.015 16.5/18.5 2.00/2.50 10.5/13.5 - - - 5xC/0.70
X2CrNiMo17-12-3 1.4432 0.030 1.00 2.00 0.045 0.015 16.5/18.5 2.50/3.00 10.5/13.0 - 0.11 - -
X2CrNiMoN17-13-3 1.4429 0.030 1.00 2.00 0.045 0.015 16.5/18.5 2.50/3.00 11.0/14.0 - 0.12/0.22 - -
X3CrNiMo17-13-3 1.4436 0.05 1.00 2.00 0.045 0.015 16.5/18.5 2.50/3.00 10.5/13.0 - 0.11 - -
X2CrNiMo18-14-3 1.4435 0.030 1.00 2.00 0.045 0.015 17.0/19.0 2.50/3.00 12.5/15.0 - 0.11 - -
X2CrNiMoN17-13-5 1.4439 0.030 1.00 2.00 0.045 0.015 16.5/18.5 4.0/5.0 12.5/14.5 - 0.12/0.22 - -
X2CrNiMo18-15-4 1.4438 0.030 1.00 2.00 0.040 0.015 17.5/19.5 3.0/4.0 13.0/16.0 - 0.11 - -
X1NiCrMoCu31-27-4 1.4563 0.020 0.70 2.00 0.030 0.010 26.0/28.0 3.0/4.0 30.0.32.0 - 0.11 - -
X1CrNiMoCu25-20-5 1.4539 0.020 0.70 2.00 0.030 0.010 19.0/21.0 4.0/5.0 24.0/26.0 1.20/2.00 0.15 - -
X1CrNiMoCuN20-18-7 1.4547 0.020 0.70 1.00 0.030 0.010 19.5/20.5 6.0/7.0 17.5/18.5 0.50/1.00 0.18/0.25 - -
X1NiCrMoCuN25-20-7 1.4529 0.020 0.50 1.00 0.030 0.010 19.0/21.0 6.0/7.0 24.0/26.0 0.50/1.50 0.15/0.25 -  
Austenitic ferritic steels
X2CrNiMoN22-5-3  1.4462  0.030  1.00  2.00  0.035  0.015  21.0/23.0  2.50/3.5 4.5/6.5  -  0.10/0.22 - -
X2CrNiN23-4 1.4362 0.030 1.00 2.00 0.035 0.015 22.0/24.0 0.10/0.60 3.5/5.5 0.10/0.60 0.05/0.20 - -
X2CrNiMoN25-7-4 1.4410 0.030 1.00 2.00 0.035 0.015 24.0/26.0 3.0/4.5 6.0/8.0 - 0.24/0.35 - -
X2CrNiMoCuWN25-7-4 1.4501 0.030 1.00 1.00 0.035 0.015 24.0/26.0 3.0/4.0 plus W 0.50/1.00 6.0/8.0 0.50/1.00 0.20/0.30 - -
X2CrNiMoCuN 1.4507 0.030 0.70 2.00 0.035 0.015 24.0/26.0 2.7/4.0 5.5/7.5 1.00/2.50 0.15/0.30 - -

top

Office and Postal Address: BSSA, Regus, Blades Enterprise Centre, John Street, Sheffield S2 4SW

Registered Office: Pegasus House, 463A Glossop Road, Sheffield S10 2QD

Tel: +44 (0)114 292 2636    |     Email: admin@bssa.org.uk

Copyright © 2017 British Stainless Steel Association

web design sheffield by Llama Digital