View Sample Alloy Digest Data Sheet (PDF)Since 1952, Alloy Digest has been the leading reference for materials property data on metals and alloys used throughout the world. Featuring graphs, charts and tables, these sheets give facts and figures on composition or characterization, physical and mechanical properties, heat treatment, and machinability.STELLITE 31 PM is a cobalt-base alloy recommended for handling severe conditions of abrasion, heat and corrosion. The PM designation indicates prealloyed atomized powders and parts made from the powder.