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 D2 is a high-carbon, high-chromium air-hardening tool and die steel capable of great hardness and high resistance to abrasive wear. It is non-deforming and is also somewhat corrosion resistant.