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This specification covers wrought iron-silicon (Fe-Si) steels that are generally used in the manufacture of electromechanical devices, such as relays and solenoids, requiring higher electrical resistivity, higher permeability, and lower coercivity and residual magnetism than provided by either carbon steels or soft magnetic low-carbon irons. The steels covered in this specification are Steel type2 1, 1F, 2, 2F, 3. This specification covers steels in the form and condition required for fabrication into parts. The chemical composition requirements shall conform in carbon, manganese, silicon, phosphorus, sulfur, aluminum, and iron. Available forms and conditions are forging billet, hot-rolled product, cold-finished bars, strip, and wire. The material shall undergo heat treatment before performing conventional dc magnetic testing and shall conform to the required coercive force and coercive field strength.
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 wrought iron-silicon (Fe-Si) steels that are generally used in the manufacture of electromechanical devices, such as relays and solenoids, requiring higher electrical resistivity, higher permeability, and lower coercivity and residual magnetism than provided by either carbon steels or soft magnetic low-carbon irons. The steels covered in this specification are:
1.1 % Si-Fe
1.1 % Si-Fe free machining
2.3 % Si-Fe
2.3 % Si-Fe free machining
4.0 % Si-Fe
1.2 This specification covers steels in the form and condition required for fabrication into parts. The fabricated parts typically require a final heat treatment to obtain the desired magnetic performance. The term mill annealed as used in this specification applies to a heat treatment, typically applied by the producer, intended to improve formability. The mill anneal does not provide the optimum magnetic performance and is not intended to replace the need for the finish annealing of parts.
1.3 This specification covers steels in the form of forging billets, hot-rolled bar and strip, cold-finished bar, wire, and cold-rolled strip in thicknesses up to 6.35 mm (0.250 in.).
1.4 This specification does not cover electrical sheet steels used in transformer and motor laminations. Please refer to Specifications , , , , and for standards pertaining to these material types.
1.5 This specification does not cover powder metallurgy materials capable of being processed into magnetic core components having similar silicon contents.
1.6 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.
1.6.1 There are selected values presented in two units, both of which are in acceptable SI units. These are differentiated by the word “or,” as in “μΩ-cm, or, Ω-m.”
1.7 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.
1.8 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.
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
A341/A341M Test Method for Direct Current Magnetic Properties of Soft Magnetic Materials Using D-C Permeameters and the Point by Point (Ballistic) Test Methods
A596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens
A677 Specification for Nonoriented Electrical Steel Fully Processed Types
A683 Specification for Nonoriented Electrical Steel, Semiprocessed Types
A726 Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
A773/A773M Test Method for Direct Current Magnetic Properties of Low Coercivity Magnetic Materials Using Hysteresigraphs
A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types
A1086 Specification for Thin-Gauge Nonoriented Electrical Steel Fully Processed Types
ICS Number Code 77.140.50 (Flat steel products and semi-products)
UNSPSC Code 39122300(Electrical relays and accessories)
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ASTM A867-19, Standard Specification for Iron-Silicon Relay Steels, ASTM International, West Conshohocken, PA, 2019, www.astm.orgBack to Top