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.AISI 4422 is a carbon-molybdenum type carburizing steel designed as alternate for the AISI 8600 grades of steel for single quench practice. It is recommended for case hardened gears, pinions, shafts and the like.