ASTM A811-15(2022)

Anotace textu normy ASTM A811-15(2022) :

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.


Keywords:
coercive field strength, iron, powder metallurgy, powder metallurgy parts,, ICS Number Code 77.160 (Powder metallurgy)