Ambient temperature mechanical properties for BS EN 10253-3 and 10253-4 for stainless steel butt weld fittings
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 is a summary of the mechanical properties
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The data given is not intended to replace that shown in individual standards to which reference should always be made.
| Steel grade |
Proof strength min MPA |
Tensile strength MPa |
Elongation A min % |
Resistance to intergranular corrosion |
| Steel name |
Steel number |
Rp0.2 |
Rp1.0 |
Rm |
long |
trans |
| Austenitic stainless steels |
| X2CrNi18-9 |
1.4307 |
180 |
215 |
470/670 |
40 |
35 |
Yes |
| X2CrNi19-11 |
1.4306 |
180 |
215 |
460/680 |
40 |
35 |
Yes |
| X2CrNiN18-10 |
1.4311 |
270 |
305 |
550/760 |
35 |
30 |
Yes |
| X5CrNi18-10 |
1.4301 |
195 |
230 |
500/700 |
40 |
35 |
Yes* |
| X6CrNiTi18-10 |
1.4541 |
200 |
235 |
500/730 |
35 |
30 |
Yes |
| X6CrNiNb18-10 |
1.4550 |
205 |
240 |
510/740 |
35 |
30 |
Yes |
| X2CrNiMo18-14-3 |
1.4335 |
190 |
225 |
490/690 |
40 |
30 |
Yes |
| X2CrNiMo17-12-2 |
1.4404 |
190 |
225 |
490/690 |
40 |
30 |
Yes |
| X5CrNiMo17-12-2 |
1.4401 |
205 |
240 |
510/710 |
40 |
30 |
Yes* |
| XCrNiMoTi17-12-2 |
1.4571 |
210 |
245 |
500/730 |
35 |
30 |
Yes |
| X2CrNiMo17-12-3 |
1.4432 |
190 |
225 |
490/690 |
40 |
30 |
Yes |
| X2CrNiMoN17-13-3 |
1.4429 |
295 |
330 |
580/800 |
35 |
30 |
Yes |
| X3CrNiMo17-13-3 |
1.4436 |
205 |
240 |
510/710 |
40 |
30 |
Yes* |
| X2CrNiMo18-14-3 |
1.4435 |
190 |
225 |
490/690 |
40 |
35 |
Yes |
| X2CrNiMoN17-13-5 |
1.4439 |
285 |
315 |
580/800 |
35 |
30 |
Yes |
| X2CrNiMo18-15-4 |
1.4438 |
220 |
250 |
490/690 |
35 |
30 |
Yes |
| X1CrMoCu31-27-4 |
1.4563 |
215 |
245 |
500/750 |
40 |
35 |
Yes |
| X1CrNiMoCu25-20-5 |
1.4539 |
220 |
250 |
520/720 |
35 |
30 |
Yes |
| X1CrNiMoCuN20-18-7 |
1.4547 |
300 |
340 |
650/850 |
35 |
30 |
Yes |
| X1NiCrMoCuN25-20-7 |
1.4529 |
300 |
340 |
600/800 |
40 |
40 |
yes |
| Austenitic ferritic steels |
| X2CrNiMoN22-5-3 |
1.4462 |
450 |
|
700/920 |
25 |
20 |
Yes |
| X2CrNiN23-4 |
1.4362 |
400 |
|
600/820 |
25 |
25 |
Yes |
| X2CrNiMoN25-7-4 |
1.4410 |
550 |
|
800/1000 |
20 |
20 |
Yes |
| X2CrNiMoCuWN25-7-4 |
1.4501 |
550 |
|
800/1000 |
20 |
20 |
Yes |
| X2CrNiMoCuN25-6-3 |
1.4507 |
500 |
|
700/900 |
20 |
20 |
Yes |
* Normally not fulfilled in the sensitised or as-welded condition
BS EN 10253-4 has additional impact values at room temperature and – 196 deg C for austenitic stainless steels and at room temperature and -40 deg C for austenitic-ferritic stainless steels.
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