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 T15 is a cobalt type high-speed steel having maximum abrasion resistance and red hardness. It is recommended for all types of cutting tools where the machining operation is different and extreme.