Monel 403 is a nickel-copper alloy having excellent combination of strength, ductility and corrosion resistance. It is a modified form of standard Monel and formerly known as 326 Monel. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-48. Producer or source: The International Nickel Company Inc..