13Cr Martensitic Stainless (var. 17)

13Cr martensitic stainless steel (variant 17) is a chromium-hardened iron alloy with molybdenum and nickel additions, designed to achieve high strength through martensitic transformation and precipitation hardening. It is used in applications requiring a combination of corrosion resistance and superior mechanical strength, particularly in aerospace turbine components, power generation equipment, and oil & gas subsurface tools where both wear resistance and oxidation protection in demanding environments are critical. This variant's composition—including modest cobalt and vanadium content—positions it for high-temperature service and applications where traditional 13Cr stainless steels would be insufficient, making it an alternative to higher-nickel austenitic grades when weight savings or better corrosion-cracking performance is needed.