scope:

This information sheet recommends powder metallurgy, PM, steel materials and metallurgical quality characteristics for use in specifying PM gearing. It identifies specifications and requirements for various PM steel materials for as--sintered, through hardened or sinter hardened, carburized case hardened, and induction hardened gearing. Requirements are coded by process and class number, the latter based on the density of the PM gear teeth. Characteristics covered include material composition, density, sinter processing (conventional, high temperature and sinter hardening), secondary heat treatments and post heat treatment processing, and their associated inspections.