ASTM A456/A456M-08

    Historical Standard: ASTM A456/A456M-08 Standard Specification for Magnetic Particle Examination of Large Crankshaft Forgings

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    ASTM A456 / A456M

    1. Scope

    1.1 This is an acceptance specification for the magnetic particle inspection of forged steel crankshafts having main bearing journals or crankpins 4 in. [200 mm] or larger in diameter.

    1.2 There are three classes, with acceptance standards of increasing severity:

    1.2.1 Class 1.

    1.2.2 Class 2 (originally the sole acceptance standard of this specification).

    1.2.3 Class 3 (formerly covered in Supplementary Requirement S1 of Specification A 456 64 (1970)).

    1.3 This specification is not intended to cover continuous grain flow crankshafts (see Specification A 983/A 983M); however, Specification A 986/A 986M may be used for this purpose.

    Note 1—Specification A 668/A 668M is a product specification which may be used for slab-forged crankshaft forgings that are usually twisted in order to set the crankpin angles, or for barrel forged crankshafts where the crankpins are machined in the appropriate configuration from a cylindrical forging.

    1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

    1.5 Unless the order specifies the applicable M specification designation, the material shall be furnished to the inch 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

    A668/A668M Specification for Steel Forgings, Carbon and Alloy, for General Industrial Use

    A966/A966M Practice for Magnetic Particle Examination of Steel Forgings Using Alternating Current

    A983/A983M Specification for Continuous Grain Flow Forged Carbon and Alloy Steel Crankshafts for Medium Speed Diesel Engines

    A986/A986M Specification for Magnetic Particle Examination of Continuous Grain Flow Crankshaft Forgings

    E1417 Practice for Liquid Penetrant Testing


    ICS Code

    ICS Number Code 77.140.85 (Iron and steel forgings)

    UNSPSC Code

    UNSPSC Code 26101749(Crankshaft)


    DOI: 10.1520/A0456_A0456M-08

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