Standard Speciﬁcation for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes1
This trendy is issued beneath the ﬁxed designation a 556/a 556m; the variety immediately following the designation indicates the 12 months of unique adoption or, within the case of revision, the yr of remaining revision. A number of in parentheses indicates the 12 months of ultimate reapproval. A superscript epsilon (e) suggests a piece of writing trade since the ultimate revision or reapproval.
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