Standard Speciﬁcation for Electric-Resistance-Welded Carbon Steel and CarbonManganese Steel Boiler and Superheater Tubes1
This trendy is issued beneath the ﬁxed designation a 178/a 178m; the variety straight away following the designation indicates the yr of original adoption or, within the case of revision, the 12 months of ultimate revision. more than a few in parentheses indicates the year of last reapproval. a superscript epsilon (e) suggests an article change since the final revision or reapproval.
This widespread has been permitted to be used by means of groups of the department of defense.
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