Hello usmani
That material is (as you point out) not in ASME Section II - Part D. The strategy you suggest is acceptable. However, if you are buiding a coded vessel, you should check with you Authorised Inspector (AI). We at Intergraph do not have the authority to certify and unlisted material.
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Sincerely,
Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM