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.Crucible S7 is a chromium/molybdenum tool steel developed to produce the unusual combination of high shock resistance and toughness together with ease of machining and heat treatment. It is a versatile tool steel applicable for both hot and cold work shock applications.