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.THYROPLAST 2312 is a quenched and tempered plastic mold steel with sulfur added for improved machinability over P20 and Thyroplast 2311.