AISI No. 685 is a high-temperature, high-strength, cobalt-base alloy. It responds to an age-hardening heat treatment. At elevated temperatures it has high mechanical properties and excellent resistance to corrosion and oxidation. Its numerous applications include high-temperature hardware, turbine blades, parts for jet engines and aerospace components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Co-79. Producer or source: High-strength, high-temperature alloy mills & foundries.