Ambient Temperature Mechanical Properties for BS EN 10253-3 and 10253-4 For Stainless Steel Butt Weld Fittings
Ambient temperature mechanical properties for BS EN-10253-3 and 10253-4 for stainless-steel butt-weld fitting
BS EN 10253-3 and 10253-4 are the EN standards for austenitic and duplex stainless steel butt-welding pipe fittings
without and with specific inspection requirements. This article summarises the mechanical properties
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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