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.Inland DuraSpring is a newly developed high-strength microalloyed spring steel for use in high stress coil springs for automobile and light truck suspension systems. This patented bar product offers significant improvements in tensile strength, fatigue properties, and fracture toughness compared to conventional spring steels.