15Cr Martensitic Stainless (var. 9)

15Cr martensitic stainless steel is a chromium-hardened iron alloy with cobalt and molybdenum additions, designed to achieve high strength through martensitic hardening while maintaining corrosion resistance typical of stainless steels. This grade is used in demanding applications where both wear resistance and corrosion protection are critical, such as high-performance cutting tools, turbine components, and aerospace fasteners that must withstand aggressive environments. The cobalt addition distinguishes this variant from standard 15Cr martensitic grades, improving high-temperature strength and red hardness—making it preferred over lower-alloy alternatives in applications involving elevated thermal cycling or sustained loads.