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.Ferralium 255 (see Alloy Digest SS-481) is one of the early superduplex stainless steels. It has been modified over time with special chemistry, heat treatment, and production methods. This version is the age-hardened grade, or a Stamicarbon grade, and is supplied only in bar form.