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.Nickel-Copper Alloys 505 and 506 are strong castings alloys. Both alloys combine high strength with good wear resistance. Alloy 505 (4% silicon) is employed where exceptional resistance to galling is needed. Alloy 506 (3% silicon) is recommended where good (but not exceptional) galling resistance is sufficient.