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.Marinel 230 is an ultrahigh-strength alloy with improved bearing and hardness properties compared to Marinel (see Alloy Digest Cu-602). It is a copper alloy with 18% nickel and high manganese and aluminum. It develops high strength with excellent corrosion resistance in seawater. It is the successor alloy to Marinel 220 (see Alloy Digest Cu-736).