COPPER ALLOY No. 745 is a copper-nickel-zinc alloy which has very good workability, weldability, and corrosion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: Cu-251. Producer or source: Copper and copper alloy mills.