Impact test requirements of UNS 31254 as per B31.3
Mohammed Rafiuddin
I have to qualify a welding procedure for welding of UNS 31254 base metals.My design temperature is -120 degree centigrade.I am using ERNiCrMo-3 filler wire.Please advice if Impact test is required to be performed at min.design temperature?
Base metal : UNS 31254
Filler : ERNiCrMo-3
Design Temperature : -120 deg.centigrade
Thickness : 5.54 & 15.54 (2 PQRS)
Code : ASME B31.3
Thanks a lot
Regards,
Mohammed Azharuddin
pgoswami
Hi,Mohammed Azharuddin,
As per B-31.3, UNS S 31254 is allowed for design condition up to -325 Deg F(-196 Deg C) , with the specified material properties mentioned as below(See A-1). In addition the base metal should be solution annealed.
Theoretically as per Table -323.2.2, austenitic stainless steel welds would require impact testing if the conditions mentioned below are not fulfilled.
One has to know the the procurement specification for UNS 31254 pipe???
If the pipes are impact tested in the mills @ -325 DegF then it's deemed that subject to good welding condition and subject to the good impact values of the welding consumables (same as base metal) , impact test would be exempted in the weld coupons @ -120 Deg C. Also all the clauses in Table 323.2.2 needs to be fulfilled
However the integrity of UNS S31254 is a crucial factor in any offshore application (I assume it's the intended use).
If that's the case I would advise the impact to be done on the procedure qualification coupon for due diligence.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering
Specialist
Hamilton, Ontario,
Canada
pgos...@quickclic.net
pradip....@gmail.com
ca.linkedin.com/pub/pradip-goswami/5/985/299
A-1
A-2
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