NICKEL SILVER, 55-18 is a spring quality nickel silver alloy having high resistance to corrosion and tarnish. It is used primarily for springs and electrical resistances. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-61. Producer or source: Copper alloy mills.