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.UNS No. T30106 is an air-hardening high-carbon tool steel designed for a combination of high strength, good wear resistance, and good toughness. It is easy to heat treat with a minimum of distortion and is used extensively for plastic molds.