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.PROJECT 70 is a modified Type 416 corrosion resistant steel offering improved machinability. It is recommended for automatic screw machine operations where longer tool life results in more productive machine time.