17-7 is a precipitation-hardening stainless steel that provides property combinations particularly well suited for use in aerospace applications. It performs well in applications that require high strength and corrosion resistance. Its properties include: Excellent strength and hardness Excellent fatigue properties Good corrosion resistance Good formability Minimum distortion when heat treated. 17-7 also provides outstanding value for other applications, such as flat springs, that require high strength, corrosion resistance and properties that hold at temperatures up to 600°F (316°C).