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.AISI Type H13 is an air-hardening hot work tool and die steel having a high resistance to heat checking and erosive action. It has good wear resistance and hot hardness. It is recommended for die casting and extrusion dies.