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 Astm A 891 – 98 (Reapproved 2003) pdf free download