ARMCO 17-4 PH, a precipitation hardening stainless steel, is widely accepted in a broad range of industries. High strength, excellent corrosion resistance, ease of heat treatment and good weldability make it an important alloy to designers and engineers. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-7. Producer or source: Baltimore Specialty Steels Corporation. Originally published April 1953, revised June 1959, revised September 1989.