11Ni-13Co Maraging Steel (var. 9)

11Ni-13Co maraging steel (variant 9) is a precipitation-hardened iron-nickel alloy engineered for ultra-high strength without sacrifice of toughness or machinability; the high nickel and cobalt content enables age-hardening via intermetallic precipitate formation after solution treatment. This material is primarily used in aerospace and defense applications where weight savings and superior strength-to-weight ratio are critical, including missile bodies, rocket motor casings, landing gear components, and aircraft structural elements. Maraging steels offer a distinct advantage over conventional high-strength steels by combining exceptional strength with good ductility and dimensional stability during heat treatment, making them preferred for precision-critical applications where post-machining distortion must be minimized.