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.Panther Special is a cobalt high-speed steel recommended for heavy duty cutting of hard, gritty materials, such as cast iron as well as heat treated alloy steels.