ASTM A668/A668M-04

    Standard Specification for Steel Forgings, Carbon and Alloy, for General Industrial Use

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    1. Scope

    1.1 This specification covers untreated and heat-treated carbon and alloy steel forgings for general industrial use. Other ASTM specifications for forgings are available for specific applications such as pressure vessels, railroad use, turbine generators, gearing, and others involving special temperature requirements.

    1.2 Hot-rolled or cold finished bars are not within the scope of this specification.

    1.3 Six classes of carbon steel and seven classes of alloy steel forgings are listed (see Section ) , which indicates their required heat treatments, as well as mechanical properties.

    1.4 Provision, with the suffix H for certification and marking, for the supply of forgings after hardness testing only.

    1.5 Supplementary requirements, including those in Specification A 788, of an optional nature are provided. These shall apply only when specified by the purchaser.

    1.6 lists the current classes corresponding to the various classes of Specifications A 235, A 237, and A 243, which have been superseded by this specification.

    1.7 The values stated in either inch-pound units or SI units are to be regarded separately as the standard; within the text and tables, the SI units are shown in brackets. The values stated in each system are not exactly equivalent; therefore; each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

    1.8 Unless the order specifies the applicable "M" specification, the forgings shall be furnished to the 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

    A275/A275M Practice for Magnetic Particle Examination of Steel Forgings

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A388/A388M Practice for Ultrasonic Examination of Steel Forgings

    A788/A788M Specification for Steel Forgings, General Requirements

    E290 Test Methods for Bend Testing of Material for Ductility

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


    ICS Code

    ICS Number Code 77.140.85 (Iron and steel forgings)

    UNSPSC Code

    UNSPSC Code 31132100(Steel forgings)


    DOI: 10.1520/A0668_A0668M-04

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