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 H13 (formerly Thermold AV) is an air-hardening hot-work tool steel having good wear resistance and hot hardness at elevated temperature. Recently Uniforged Rounds of THERMOLD H13 were developed especially for critically stressed extrusion tools and other hot-work tooling applications.