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.Lo-Air is a high-carbon alloy steel having air hardening characteristics. It is a deep hardening steel producing a combination of high strength, toughness and wear resistance. It is recommended for precision tools and heavy duty blanking and forming dies.