Standard Specification for
Precipitation Hardening Iron Base Superalloy Forgings for
Turbine Rotor Disks and Wheels1

This standard is issued under the fixed designation A 891; 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 891 – 98 (Reapproved 2003) Pdf free

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Click here to Astm A 890/A 890M – 99 (Reapproved 2003) Pdf Free Download