Standard Speciﬁcation for Pressure Vessel Plates, Five Percent Nickel Alloy Steel, Specially Heat Treated1
This trendy is issued underneath the ﬁxed designation a 645/a 645m; the variety right now following the designation suggests the 12 months of authentic adoption or, inside the case of revision, the year of remaining revision. More than a few in parentheses shows the 12 months of final reapproval. A superscript epsilon (e) suggests an article trade for the reason that final revision or reapproval.
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