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.MST 431 is an alpha-beta type sheet alloy presently being supplied in the solution treated, solution treated and aged, and annealed conditions. Its principal advantage is good formability in the solution treated condition with subsequent high strength capability through an aging treatment. Properties indicate good strength and thermal stability for sheet applications up to 800 F for long times.