Standard Speciﬁcation for Pressure Vessel Plates, Alloy Steel, Quenched-and tempered, Chromium-Molybdenum, and ChromiumMolybdenum-Vanadium1
This preferred is issued underneath the ﬁxed designation a 542/a 542m; the variety straight away following the designation shows the yr of unique adoption or, in the case of revision, the yr of closing revision. A range of in parentheses suggests the yr of final reapproval. A superscript epsilon (e) suggests an article trade for the reason that ultimate revision or reapproval.
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