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.Alloy Steel 8124 (Nonstandard, using AISI-SAE numbering system) is a nickel-chromium-molybdenum carburizing steel for use where a core of medium strength and toughness combined with a wear-resistant carburized case is sufficient. This steel can be used also without carburizing for many machinery components and structural purposes.