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.Nirosta 4568 is a higher-carbon alloy used primarily in high mechanical loading applications for strength retention. It is often supplied in the strained condition and used as springs.