0.05C 8.4Cr-1.8Mo-11.5Ni Low Alloy Steel

This is a precipitation-hardening martensitic stainless steel combining high chromium (8.4%), nickel (11.5%), and molybdenum (1.8%) content with very low carbon (0.05%), designed to achieve high strength while maintaining reasonable toughness and corrosion resistance. It is used in aerospace and defense applications where components must withstand extreme stress in corrosive or cryogenic environments—such as landing gear, fasteners, and structural fittings in aircraft and missiles. The high nickel and molybdenum content improves toughness compared to conventional martensitic stainless steels, while the low carbon and careful alloying reduce hydrogen embrittlement risk, making it preferred for critical load-bearing parts where both strength and damage tolerance are essential.