Abstract

This specification covers the detailed requirements for specified grades of flat-rolled, grain-oriented, fully processed low-carbon silicon-iron electrical steels, whose low core loss and high permeability in the direction of rolling have been achieved by appropriate metallurgical processing. These steels are primarily used in transformer cores operating at moderate to high magnetic flux densities at commercial power frequencies. The ASTM core-loss type designations for the electrical steels covered here are 18G041, 23G045, 27G051, 30G058, 35G066, 23H070, 27H074, 30H083, 35H094, 23P060, 27P066, 23Q054, and 27Q057. Steels may be acquired in any of four conditions, classified according to a combination of material form and surface type or treatment as desired for the expected end use. Materials shall conform to specified values of magnetic properties (core loss, permeability, and magnetic aging), physical dimensions (thickness, length, and width), and mechanical properties (lamination factor and ductility).

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. Scope

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

A345 Specification for Flat-Rolled Electrical Steels for Magnetic Applications

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

A721/A721M Test Method for Ductility of Oriented Electrical Steel

A804/A804M Test Methods for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Sheet-Type Test Specimens

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

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

Keywords

electrical steel; grain-oriented; high permeability;

ICS Code

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

DOI: 10.1520/A0876-12

ASTM International is a member of CrossRef.

ASTM A876