[MW:16690] Question on Material Selection - ASME B16.5 standard.

As per ASME B16.5, we have one case of 2" Std. Flange. The material used by Vendor for the std. flange is SB564-N10276, but referring to the standard (B16.5) for N10276 , the material specified is only B462. can we allow vendor to use B564 instead of B462. OR is it mandatory to use the material as per B16.5.Need Expert opinion

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