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.IMPAX SUPREME* is a vacuum degassed chromium-nickel-molybdenum steel, manufactured to consistently high quality. It is ideally suited to the production of molds and dies for plastics processing. (Supercedes UHB IMPAX P20: see Alloy Digest TS 326, October, 1977).