COPPER ALLOY No. 706 is an alloy of copper and nickel which has been modified by the addition of approximately 1.4% iron to improve its resistance to salt water corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-231. Producer or source: Copper and copper alloy mills.