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 No. 630* is a precipitation hardening stainless steel which is used in a variety of applications requiring strength combined with corrosion resistance. It is recommended for chemical process equipment, valve parts, aircraft fittings, pump shafts, etc.