ASTM A521/A521M-06

    Standard Specification for Steel, Closed-Impression Die Forgings for General Industrial Use


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    1. Scope

    1.1 This specification covers untreated and heat-treated steel, closed-impression die forgings (Note 1) for general industrial use. Note 1—For the definition of a forging, refer General Requirements Specification A 788/A 788M.

    1.2 The Grades of forgings are as follows, the choice depending on design and stress or service to be imposed:

    1.2.1 Grade CA Untreated, carbon steel forgings,

    1.2.2 Grades CC, CC1, and CE Annealed, normalized and tempered, carbon steel forgings,

    1.2.3 Grade CF Normalized and tempered carbon steel forgings,

    1.2.4 Grade CF1 Double normalized and tempered carbon steel forgings,

    1.2.5 Grade CG Quenched and tempered, or normalized, quenched and tempered carbon steel forgings,

    1.2.6 Grade AA Annealed, normalized, or normalized and tempered alloy steel forgings,

    1.2.7 Grades AB and AC Normalized and tempered alloy steel forgings, and

    1.2.8 Grades AD, AE, AF, AG, and AH Normalized, quenched, and tempered alloy steel forgings.

    1.3 Unless the order specifies the applicable "M" specification designation, the forgings shall be furnished with the inch-pound units.

    1.4 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standard. 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 shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.


    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

    A29/A29M Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for

    A275/A275M Practice for Magnetic Particle Examination of Steel Forgings

    A322 Specification for Steel Bars, Alloy, Standard Grades

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A388/A388M Practice for Ultrasonic Examination of Steel Forgings

    A576 Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality

    A788/A788M Specification for Steel Forgings, General Requirements

    A921/A921M Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging

    E3 Guide for Preparation of Metallographic Specimens

    E45 Test Methods for Determining the Inclusion Content of Steel

    E94 Guide for Radiographic Examination

    E112 Test Methods for Determining Average Grain Size

    E340 Test Method for Macroetching Metals and Alloys

    E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings

    E407 Practice for Microetching Metals and Alloys


    ICS Code

    ICS Number Code 77.140.85 (Iron and steel forgings)

    UNSPSC Code

    UNSPSC Code 31301203(Steel closed die machined forgings)


    Referencing This Standard

    DOI: 10.1520/A0521_A0521M-06

    ASTM International is a member of CrossRef.


    Citation Format

    ASTM A521 / A521M-06, Standard Specification for Steel, Closed-Impression Die Forgings for General Industrial Use, ASTM International, West Conshohocken, PA, 2006, www.astm.org

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