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.ALZ 309 is a high-silicon, austenitic stainless steel combining high resistance to oxidation with high tensile and creep strength at elevated temperatures. Corrosion resistance is excellent. The steel has good ductility and is readily welded so that difficult shapes and structures are easily fabricated.