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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