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ASTM A904-14

Historical Revision

Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts

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1.1 This specification covers the magnetic properties of 50 nickel-50 iron parts fabricated by powder metallurgy techniques and is intended for parts that require high magnetic permeability, high electrical resistivity, low coercive field strength, and low hysteresis loss. It differs from the wrought alloy specification (see Specification A753) because these parts are porous. A number of magnetic properties such as permeability are proportional to the sintered density.

1.2 This specification deals with powder metallurgy parts in the sintered or annealed condition. Should the sintered parts be subjected to any secondary operation that causes mechanical strain, such as machining or sizing, they should be resintered or annealed.

1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded separately as standard. The values given in parentheses are mathematical conversions to SI units, which are provided for information only and are not considered standard.

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 and health practices and determine the applicability of regulatory limitations prior to use.


This specification covers the magnetic property requirements of 50 nickel-50 iron soft magnetic parts fabricated by powder metallurgy techniques in the sintered or annealed conditions, intended for parts that require high magnetic permeability, high electrical resistivity, low coercive field strength, and low hysteresis loss. Magnetic parts shall be tested and adhere to chemical composition and sintered density requirements, to which magnetic and residual induction strongly depends on. Parts shall also be tested for their conformance to coercive field strength requirements. The user and producer shall agree upon a representative number of specimens for testing.


SDO ASTM: ASTM International
Document Number A904
Publication Date May 1, 2014
Language en - English
Page Count 3
Revision Level 14
Supercedes
Committee A06.02
Publish Date Document Id Type View
June 1, 2020 A0904-20 Revision
May 1, 2014 A0904-14 Revision
Nov. 1, 2009 A0904-09 Revision
May 1, 2004 A0904-04 Revision
April 10, 1998 A0904-98 Revision