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About This Item
Full Description
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 A 753) 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 P/M 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.
Document History
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ASTM A904-20
Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts- Most Recent
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ASTM A904-14
Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts- Historical Version
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ASTM A904-09
Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts- Historical Version
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ASTM A904-04
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Standard Specification for 50 Nickel-50 Iron Powder Metallurgy (P/M) Soft Magnetic Parts- Historical Version
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ASTM A904-98
Standard Specification for 50 Nickel-50 Iron Powder Metallurgy (P/M) Soft Magnetic Alloys- Historical Version