11Ni-13Co Maraging Steel (var. 3)

11Ni-13Co maraging steel (variant 3) is a precipitation-hardened iron-nickel-cobalt alloy engineered for extremely high strength in a relatively low-carbon system, achieving its properties through age-hardening of intermetallic phases rather than traditional carbon-based hardening. This material is used in aerospace, defense, and high-performance sporting equipment where weight savings and damage tolerance are critical—particularly in rocket motor casings, aircraft landing gear, pressure vessels, and precision tooling. Engineers select maraging steels over conventional high-strength steels when combining ultrahigh strength with superior toughness and weldability is essential, avoiding the brittleness and distortion issues that plague traditional quenched-and-tempered alloys.