ASTM A904-14 PDF

Scope: 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.

ASTM A904-14 Referenced Document

ASTM A34/A34M Standard Practice for Sampling and Procurement Testing of Magnetic Materials
ASTM A340 Standard Terminology of Symbols and Definitions Relating to Magnetic Testing
ASTM A596/A596M Standard Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens
ASTM A753 Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
ASTM A773/A773M Standard Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc Electronic Hysteresigraphs
ASTM B328 Standard Test Method for Density, Oil Content, and Interconnected Porosity of Sintered Metal Structural Parts and Oil-Impregnated Bearings
ASTM B962 Standard Test Methods for Density of Compacted or Sintered Powder Metallurgy (PM) Products Using Archimedes’ Principle
ASTM E1019 Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel and in Iron, Nickel, and Cobalt Alloys*， 2024-04-20 Update

2020 ASTM A904-20 Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
2014 ASTM A904-14 Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
2009 ASTM A904-09 Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
2004 ASTM A904-04 Standard Specification for 50 Nickel-50 Iron Powder Metallurgy (P/M) Soft Magnetic Parts
1998 ASTM A904-98 Standard Specification for 50 Nickel-50 Iron Powder Metallurgy (P/M) Soft Magnetic Alloys