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. 635 is a transformation and a precipitation hardening stainless steel providing a combination of a high degree of corrosion resistance with high strength and hardness. It is recommended for valves, bearings, and chemical and food processing equipment.