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ASTM A801 - 21
Standard Specification for Wrought Iron-Cobalt High Magnetic Saturation Alloys (UNS R30005 and K92650)
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Abstract
This specification covers wrought iron-cobalt high magnetic saturation alloys, UNS R30005 and UNS K92650, for use in magnetic components requiring high permeability or high magnetic saturation. It covers material supplied in form of forging billets, hot-rolled products cold-finished bars, and strip. The material shall conform to the chemical requirements prescribed in this specification. Chemical analysis shall be performed for carbon, nitrogen, sulfur, and oxygen contents. DC magnetic property,which is the magnetic flux density of the material, shall meet the requirements prescribed in each type of alloys.
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
1.1 This specification covers two wrought iron-cobalt alloy types for use in magnetic components requiring high permeability at and above 1.5 T (15 kG) or high saturation flux density. The specific alloy types covered are:
| Alloy Type | UNS | Nominal Composition |
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| 1 | R30005 | 49 % Co, 49 % Fe, 2 % V |
| 2 | K92650 | 27 % Co, 0.50 % Cr, balance Fe |
1.1.1 This specification also covers material supplied by a producer in the form and physical condition suitable for fabrication into parts that will later be given final heat treatment to achieve the desired magnetic characteristics and, where required, mechanical properties. It covers material supplied in form of forging billets, hot-rolled products (that is, bar, plate, and strip), cold-finished bars, and cold-rolled strip.
1.2 This specification does not cover parts produced by casting or by powder metallurgical techniques.
1.3 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.
1.3.1 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 “g/cm3, or, (kg/m3).”
1.4 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.
1.5 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.
ASTM Standards
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
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 Point by Point (Ballistic) Method and Ring Specimens
A773/A773M Test Method for Direct Current Magnetic Properties of Low Coercivity Magnetic Materials Using Hysteresigraphs
E1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Inert Gas Fusion Techniques
ICS Code
ICS Number Code 77.080.10 (Irons)
UNSPSC Code
UNSPSC Code 31381100(Castmagnets and magnet assemblies)
Referencing This Standard
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DOI: 10.1520/A0801-21
Citation Format
ASTM A801-21, Standard Specification for Wrought Iron-Cobalt High Magnetic Saturation Alloys (UNS R30005 and K92650), ASTM International, West Conshohocken, PA, 2021, www.astm.org
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