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.UNS H51200 is a low-carbon, low-chromium carburizing steel recommended for applications where a core of medium strength and toughness combined with a wear-resistant case is sufficient. It has medium hardenability and it can be used without carburizing.