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.Allegheny Ludlum Type 303 stainless steel is a free-machining austenitic stainless steel, which retains almost all of the basic 18 chromium-8 nickel stainless steel properties.