CORONZE Alloy 638 is a cobalt-silicon modified aluminum bronze with very high strength, good fatigue properties, good corrosion and excellent stress corrosion resistance. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cu-224. Producer or source: Olin Brass.