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 446 is a corrosion and heat resisting steel with the maximum chromium content. It is used principally for the manufacture of parts that must resist high temperature service without scaling.