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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.

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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 – –

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