ALLEGHENY TYPE 439 is a ferritic stainless steel designed for its weldability and for service in mild corrosive environments. 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, and joining. Filing Code: SS-274. Producer or source: Allegheny Ludlum Corporation.