NIMONIC Alloy 263 is an air-melted nickel-base alloy which has improved ductility in welded assembly. Developed originally as a sheet material, it is available in all standard forms. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness, and deformation. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-350. Producer or source: Inco Alloys International Inc..