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.SUPER NITRALLOY is a precipitation hardening grade of nitriding steel designed primarily for high core hardness and toughness. It is recommended for parts requiring fatigue and wear resistance, such as cams, gears and shafts.