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. 770 is a spring quality copper-nickel zinc alloy having high resistance to corrosion. It is recommended primarily for optical goods, springs, resistance wire, hardware and similar products.