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;
The types of product covered by the standards are:
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.
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 | – | – |