11Ni-13Co Maraging Steel (var. 7)

11Ni-13Co Maraging Steel (var. 7) is a high-strength iron-nickel-cobalt maraging alloy designed to achieve exceptional strength through precipitation hardening rather than carbon content, resulting in a relatively low-carbon, tough martensitic matrix. This variant is used in aerospace, defense, and precision tooling applications where ultra-high strength combined with fracture toughness and dimensional stability are critical—particularly in rocket motor cases, landing gear, and high-performance fasteners where conventional high-carbon steels would be too brittle. Engineers select maraging steels over standard quenched-and-tempered alloys when they need superior strength-to-toughness ratios, excellent weldability, minimal distortion during heat treatment, and reliable performance in demanding structural applications.