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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