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.THERMOLD H12 (formerly Thermold B) is a hot-work tool steal offering very high hardenability with good toughness and resistance to softening in service. It is readily heat treated to produce a uniformly fine-grained microstructure, resulting in longer die life.