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This specification covers flat-rolled, nonoriented semiprocessed 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, and are classified according to core-loss type, namely: 47S155, 47S165, 47S175, 47S190, 64S200, 64S210, 64S220, and 64S230. Melting and casting of the steel may be made by basic-oxygen, electric furnace, or other steelmaking practice(s). The elemental composition of the steel including carbon, aluminum, silicon, sulfur, manganese, phosphorus, copper, nickel, chromium, molybdenum, antimony, and tin shall depend on mill processing for the desired magnetic grade The processing sequence comprises hot rolling, pickling, cold rolling, and annealing. Requirements for (1) magnetic properties such as specific core loss, permeability, and specific exciting power, (2) mechanical properties such as lamination factor and ductility, (3) surface insulation or coating, and (3) dimensions are detailed. Tests to determine the core-loss grade and other magnetic tests shall be performed.
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.
1.1 This specification covers the detailed requirements to which flat-rolled, nonoriented semiprocessed 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 through heat treatment by the user.
1.3 These nonoriented, semiprocessed electrical steels are low carbon, silicon-iron or silicon-aluminum-iron alloys containing up to about 2.5 % silicon and less than 1 % aluminum.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to customary (cgs-emu and inch-pound) 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.
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
A719/A719M Test Method for Lamination Factor of Magnetic Materials
A720/A720M Test Method for Ductility of Nonoriented Electrical Steel
A971 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
ICS Number Code 77.140.50 (Flat steel products and semi-products)
UNSPSC Code 31380000(Magnets and magnetic materials)
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ASTM A683-16, Standard Specification for Nonoriented Electrical Steel, Semiprocessed Types, ASTM International, West Conshohocken, PA, 2016, www.astm.orgBack to Top