"MDMT for SA-264 plate"
"If the MDMT required for pressure vessel is minus 30 deg. F. can SA-264 plate be used at 1/2" thickness? Since, it is not listed in FIG. UCS-66 it appears to me it would have to be Curve A material."
As A-264 is an ASTM specification for austenitic stainless steel clad plate, without specific requirements for the carbon or alloy steel base metal, I would agree with your interpretation of the ASME UCS-66 exemption curve. However, if your were to further investigate what ASTM/ASME specification material was used for the base metal, you might be able to make a more informed decision.
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