HASTELLOY Alloy W is a solid-solution strengthened, nickel-base alloy developed primarily for the welding of dissimilar alloys. It is available in the form of wire suitable for the welding industry. It also has been produced in the form of plate. This datasheet provides information on composition, physical properties, tensile properties, and bend strength. It also includes information on high temperature performance as well as heat treating and joining. Filing Code: Ni-353. Producer or source: Haynes International Inc..