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.Firth-Vickers F.V. 520(S) is a corrosion resistant martensitic steel which is readily weldable and capable of being hardened by low temperature heat treatment. It is recommended for turbine components and supersonic aircraft parts.