ASTM A 638/A 638M Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service
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ASTM A 638/A 638M Document Information:
Title
Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service
ASTM International
Publication Date:
Mar 10, 2000
Scope:
This specification(Footnote 2) covers hot-finished or cold-finished
precipitation hardening iron
base superalloy bars, forgings, and forging stock for high-temperature
service. The mechanical
properties of these alloys are developed by suitable solution treating
and precipitation hardening
treatments.
Two grades of iron base alloy are covered. Selection will depend upon
design, service conditions,
mechanical properties, and elevated temperature characteristics.
The values stated in either inch-pound units or SI (metric) units are
to be regarded separately as
standards; within the text and tables, the SI units are shown in
[brackets]. The values stated in
each system are not exact equivalents; therefore, each system must be
used independent of the
other. Combining values from the two systems may result in
nonconformance with the specification.
Unless the order specifies an "M" designation, the material shall be
furnished to inch-pound units.
Footnote 2 - For ASME Boiler and Pressure Vessel Code applications see
related Specification SA-638
in Section II of that Code.
Keywords:
- precipitation hardening superalloy steel
- superalloy steel bars
- superalloy steel billets
- superalloy steel forgings
- temperature service applications - high
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