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.FAGERSTA M-42 is a molybdenum super high-speed tool steel with a high carbon content and 8% cobalt. Its composition provides excellent cutting hardness and good hot-hardness characteristics. It is used widely for machining superalloys and steels that have been heat treated to Rockwell C 54.