Standard Specification for
Precipitation Hardening Iron Base Superalloy Bars,
Forgings, and Forging Stock for High-Temperature Service1

This standard is issued under the fixed designation A 638/A 638M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

Click below to download  Astm A 638/A 638M – 00 Pdf free

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Click here to Astm A 636 – 76 (Reapproved 2000) Pdf Free Download