ASTM A638/A638M-00(2004)

    Historical Standard: ASTM A638/A638M-00(2004) Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

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    ASTM A638 / A638M

    1. Scope

    1.1 This specification 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.

    1.2 Two grades of iron base alloy are covered. Selection will depend upon design, service conditions, mechanical properties, and elevated temperature characteristics.

    1.3 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.

    1.4 Unless the order specifies an "M" designation, the material shall be furnished to inch-pound units.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A484/A484M Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings

    A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

    E30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)


    ICS Code

    ICS Number Code 77.140.60 (Steel bars and rods); 77.140.85 (Iron and steel forgings)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/A0638_A0638M-00R04

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