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.COPPER Alloy No. 704 is a 5% nickel-copper alloy characterized by resistance to corrosion by high velocity sea water, resistance to stress-corrosion cracking, and retention of strength at moderately elevated temperatures.