ASTM A 646 – 95 International standard

Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings1

This fashionable is issued under the fixed designation a 646; the wide variety immediately following the designation indicates the 12 months of original adoption or, inside the case of revision, the year of ultimate revision. More than a few in parentheses suggests the yr of last reapproval. A superscript epsilon (e) shows an article alternate because the remaining revision or reapproval.

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You can also get ASTM A 645 A 645M – 99a International standard

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