ASTM A677 - 12

    Standard Specification for Nonoriented Electrical Steel Fully Processed Types

    Active Standard ASTM A677 | Developed by Subcommittee: A06.02

    Book of Standards Volume: 03.04


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    Abstract

    This specification covers the detailed requirements for flat-rolled nonoriented fully processed electrical steel intended primarily for commercial power frequency applications in magnetic devices. These electrical steels are low-carbon, silicon iron, or silicon-aluminum-iron alloys that may be made by basic-oxygen, electric-furnace, or other steelmaking practice. Desirable core-loss and permeability characteristics are developed during mill processing, so additional heat treatment is usually not necessary. For melting and casting of the electrical steel, the typical content of the chemical elements: carbon, silicon, aluminum, sulfur, manganese, phosphorus, copper, nickel, chromium, molybdenum, antimony, and tin, are given. The processing sequence for the electrical steel comprises hot-rolling, annealing, pickling, cold-rolling, and decarburizing annealing. The electrical steel shall conform to the specified magnetic properties including: specific core loss, permeability, specific exciting power, and magnetic aging. The following core-loss types are covered in this specification: 36F145, 36F155, 36F165, 36F175, 36F185, 36F195, 36F205, 47F165, 47F180, 47F190, 47F200, 47F210, 47F240, 47F280, 47F400, 47F450, 64F200, 64F210, 64F225, 64F235, 64F250, 64F275, 64F320, 64F500, and 64F550. For surface insulation, the electrical steels shall be supplied with a smooth surface finish and a thin, tightly adherent surface oxide, or applied coatings if needed. The specified thickness and mechanical requirements such as lamination factor, ductility, and hardness are given. Test methods to determine the magnetic and mechanical properties including Epstein test and bend test are detailed.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    Significance and Use

    1. Scope

    1.1 This specification covers the detailed requirements to which flat-rolled nonoriented fully processed electrical steel shall conform.

    1.2 This steel is produced to specified maximum core-loss values and is intended primarily for commercial power frequency (50- and 60-Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics are developed during mill processing, so additional heat treatment by the user is usually not necessary.

    1.3 These nonoriented fully processed electrical steels are low-carbon, silicon-iron, or silicon-aluminum-iron alloys containing up to about 3.5 % silicon and a small amount of aluminum.

    1.4 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

    A343/A343M Test Method for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method and 25-cm Epstein Test Frame

    A664 Practice for Identification of Standard Electrical Steel Grades in ASTM Specifications

    A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment

    A717/A717M Test Method for Surface Insulation Resistivity of Single-Strip Specimens

    A719/A719M Test Method for Lamination Factor of Magnetic Materials

    A720/A720M Test Method for Ductility of Nonoriented Electrical Steel

    A937/A937M Test Method for Determining Interlaminar Resistance of Insulating Coatings Using Two Adjacent Test Surfaces

    A971/A971M Test Method for Measuring Edge Taper and Crown of Flat-Rolled Electrical Steel Coils

    A976 Classification of Insulating Coatings for Electrical Steels by Composition, Relative Insulating Ability and Application

    E18 Test Methods for Rockwell Hardness of Metallic Materials

    E92 Test Method for Vickers Hardness of Metallic Materials

    E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, and Scleroscope Hardness


    ICS Code

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

    UNSPSC Code

    UNSPSC Code 31380000(Magnets and magnetic materials)


    DOI: 10.1520/A0677-12

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