C.D.C. MANGANESE ALLOY No. 720 is a copper-manganese-nickel alloy that responds to hardening by heat treatment. It has high tensile and fatigue strength, wide hardness range, and excellent corrosion resisting characteristics. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-14. Producer or source: Chicago Development Corporation.