CARPENTER No. 5 BQ is a balanced version of AISI Type 416 stainless steel and it is capable of developing a minimum hardness of Rockwell C 40 when bright hardened. Despite its high hardness, it is nearly as machinable as Type 416. Its uses are widespread. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-333. Producer or source: Carpenter.