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 H400 is an ultrahigh-strength stainless steel that has an unstable austenitic microstructure which work hardens to martensite. The alloy was developed for volume production in the automobile industry primarily for weight reduction.