Standard Speciﬁcation for Pressure Vessel Plates, Five Percent Nickel Alloy Steel, Specially Heat Treated1
This standard is issued under the ﬁxed designation A 645/A 645M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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