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ASTM A867-03

Historical Revision

Standard Specification for Iron-Silicon Relay Steels

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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:

Steel TypeNominal Composition
11.1 % Si-Fe
1F1.1 % Si-Fe free machining
22.3 % Si-Fe
2F2.3 % Si-Fe free machining
34.0 % 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 0.250 in. (6.35 mm).

1.4 This specification does not cover electrical sheet steels used in transformer and motor laminations.

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 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.


SDO ASTM: ASTM International
Document Number A867
Publication Date May 10, 2003
Language en - English
Page Count 4
Revision Level 03
Supercedes
Committee A06.02
Publish Date Document Id Type View
May 1, 2024 A0867-24 Revision
Aug. 1, 2019 A0867-19 Revision
May 10, 2003 A0867-03 Revision
May 1, 2013 A0867-03R13 Reaffirmation
May 1, 2008 A0867-03R08 Reaffirmation