ASTM A811-03

1.1 This specification covers parts produced from iron powder metallurgy materials.

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 as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.

This specification covers soft magnetic iron parts fabricated by powder metallurgy (P/M) techniques. The material shall conform to the chemical composition requirements. The density of P/M parts is determined by the compressibility of the powder, the compacting pressure, and sintering practice (temperature, time, and atmosphere). The magnetic property evaluation procedures for P/M parts are presented. Three grades, defined by coercive field strength are presented; Grade 3 was developed from interlaboratory study, Grades 2 and 3 are based on a literature review and are believed to reflect the current industry capabilities. A lot shall consist of parts of the same form and dimensions, produced from a single mixed powder batch and from an unchanged process, without discontinuity in production, and submitted for inspection at one time.