ASTM A838-02

    Standard Specification for Free-Machining Ferritic Stainless Soft Magnetic Alloy Bar for Relay Applications


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    1. Scope

    1.1 This specification covers free-machining ferritic stainless soft magnetic alloy produced or supplied expressly in cold-finished bar form for use in magnetic cores and other parts requiring a high permeability, low-coercivity stainless steel.

    1.1.1 This specification does not cover either cast parts or parts produced by powder metallurgy techniques.

    1.2 Two specific alloy types are covered. The primary constituents are shown in . These types have corrosion resistance similar to AISI Type 430F and Type 430F, Specification A 582/A 582M.

    1.3 This specification covers only these alloy types supplied in cold-finished bars in cross-sectional shapes such as rounds, squares, hexagons, and octagons with diameters (diagonals) greater than or equal to 0.250 in. (6.35 mm) and less than or equal to 1.625 in. (41.28 mm).

    1.4 Certain cold-finished round bar products are capable of being supplied mill annealed to required magnetic properties such as low coercivity. The size range that can be mill annealed is from 0.250 to 1.625 in. (6.35 to 41.28 mm). Other products of these alloys cannot be mill annealed to produce equivalently low coercivity; hence, the final machined parts should be heat treated as recommended by the producer.

    1.5 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.


    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

    A340 Terminology of Symbols and Definitions Relating to Magnetic Testing

    A341/A341M Test Method for Direct Current Magnetic Properties of Materials Using D-C Permeameters and the Ballistic Test Methods

    A582/A582M Specification for Free-Machining Stainless Steel Bars

    A596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens

    A773/A773M Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc Electronic Hysteresigraphs

    E1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Fusion Techniques

    Other Standard

    IECPublication60404- Methods of Measurement of the Coercivity of Magnetic Materials in an Open Magnetic Circuit Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.


    ICS Code

    ICS Number Code 77.140.40 (Steels with special magnetic properties)

    UNSPSC Code

    UNSPSC Code 11171600(Stainless steel alloys); 31380000(Magnets and magnetic materials)


    Referencing This Standard

    DOI: 10.1520/A0838-02

    ASTM International is a member of CrossRef.


    Citation Format

    ASTM A838-02, Standard Specification for Free-Machining Ferritic Stainless Soft Magnetic Alloy Bar for Relay Applications, ASTM International, West Conshohocken, PA, 2002, www.astm.org

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