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.LESCALLOY 9310 VAC-ARC is a premium-quality alloy carburizing steel produced by the vacuum consumable-electrode process. It has high hardenability, high core hardness and high fatigue strength, all of which make it ideally suited for critical aircraft-engine gears.