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.Sirius S12 is an austenitic stainless steel for high-temperature service. The carbon content is optimized for creep resistance, and the alloy contains additions of silicon to outperform the conventional grades in oxidation.