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    ASTM A721 / A721M - 02(2021)

    Standard Test Method for Ductility of Oriented Electrical Steel

    Active Standard ASTM A721 / A721M | Developed by Subcommittee: A06.01

    Book of Standards Volume: 03.07


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    Significance and Use

    4.1 This is a specialized bend test for grain-oriented steel not covered under the provisions of Test Methods E290.

    4.2 This test is applicable to grain-oriented silicon steel such as covered in Specification A876 in commercial thicknesses and widths up to 36 in. [910 mm].

    1. Scope

    1.1 This test method covers determination of the ductility of grain-oriented silicon steel by use of an apparatus known variously as a tinner's brake, hand folder, or an apron brake.

    1.2 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this test method, SI units are shown in brackets. 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 nonconformance with this test method.

    1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    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

    A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials

    A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types

    E290 Test Methods for Bend Testing of Material for Ductility


    ICS Code

    ICS Number Code 77.140.50 (Flat steel products and semi-products)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/A0721_A0721M-02R21

    Citation Format

    ASTM A721 / A721M-02(2021), Standard Test Method for Ductility of Oriented Electrical Steel, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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