Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service1
This widespread is issued below the fixed designation a 638/a 638m; the variety straight away following the designation shows the year of unique adoption or, within the case of revision, the year of final revision. A range of in parentheses indicates the year of remaining reapproval. A superscript epsilon (e) suggests a piece of writing trade because of the final revision or reapproval.
Click below to get ASTM A 638 A 638M – 00 International standard
You can also get ASTM A 636 – 76 International standard
