Olin C638 is a bronze with additions of aluminum, silicon, and cobalt to give a combination of strength, weldability, contact resistance, and corrosion resistance. It is typically used in springs, switch parts, and contacts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: CU-648. Producer or source: Olin Brass.