Standard Speciﬁcation for Zirconium and Zirconium Alloy Forgings1
This popular is issued underneath the ﬁxed designation b 493; the number right away following the designation indicates the year of unique adoption or, inside the case of revision, the 12 months of ultimate revision. More than a few in parentheses suggests the year of last reapproval. A superscript epsilon (e) shows an article alternate because the ultimate revision or reapproval.
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You can also get ASTM B 491 B 491M – 00 International standard