13Ni-9Co-3.0Mo-0.9Ti Maraging Steel

A precipitation-hardening maraging steel containing 13% nickel, 9% cobalt, and molybdenum/titanium additions, designed to achieve ultra-high strength through age-hardening rather than carbon content. This class of steel is the workhorse for applications demanding exceptional strength-to-weight ratios combined with fracture toughness and dimensional stability, notably in aerospace structures, tooling, and precision components where conventional high-carbon steels would be brittle or unstable. Engineers select maraging steels when they need to avoid the brittleness and distortion problems of traditional hardened steels, and the cobalt-bearing variants enable even higher performance than 18Ni grades—making them preferred for critical aerospace forgings, landing gear, and other highly-stressed structural parts.