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.ATLAS ALLOY 958 is a duplex stainless steel designed to maximize the resistance to chloride corrosion. The alloy is balanced to produce a duplex stainless steel containing austenite dispersed throughout a ferrite matrix. It is an excellent material for pumps and valves in seawater and other aggressive environments.