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.OMEGA is a silicon-manganese shock-resisting tool steel recommended for repeated and severe impact service. This is an A.S.M. Class III-C tool steel (SAE Type S5.)