B31.3 Weld Strength Reduction Factor "W" for Low Alloy Steels 1

[spayette]

Recent Code Editions have included a new factor, termed "W" (Weld Strength Reduction Factor), to be included in thickness and other calculations. The factor is the same for all materials although the Code provides latitude in this regard if other data is available to the user.

Is anyone aware of any other published values for "W" for 2-1/4Cr-1Mo longitudinal welds?

 

[metengr]

Yes. The soon-to-be revision to ASME B&PV Code, Section I, will have new weld reduction factors that basically originated from ASME B31.1, and will now be included in PG-27. The WSRF's for incorporation into Section I is a major change in thinking by now permitting seam welded pipe for boiler components. A task group consisting of members of Section I, and B31.1 worked diligently on this item as it was reviewed up the chain.

The following WSRF's were reviewed by the various SG's under Section I, SCI and had passed the MC of ASME B&PVCS on the last letter ballot.

For Cr-Mo alloys up to 5 %Cr;

800 deg F WRF 1
850 0.95
900 0.91
950 0.86
1000 0.82
1050 0.77
1100 0.73

 

[spayette]

metengr,

Thanks so much for your response. This information will be extremely useful to us.