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[MW:23612] MW:23607]-Impact test requirements of UNS 31254 as per B31.3

By Materials & Welding

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
pgoswami@quickclic.net
pradip.goswami@gmail.com
ca.linkedin.com/pub/pradip-goswami/5/985/299

A-1

A-2



-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: Tuesday, September 29, 2015 10:58 AM
To: materials-welding@googlegroups.com
Subject: [MW:23607] Impact test requirements of UNS 31254 as per B31.3

Dear Experts,

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

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