0.14C 17.4Ni-1.3Mo Low Alloy Steel (var. 2)

This is a precipitation-hardening maraging steel variant, characterized by low carbon content (~0.14%), high nickel (17.4%), and molybdenum (1.3%) with significant titanium addition (2.95%), designed to achieve very high strength through age-hardening rather than carbon content. It is used primarily in aerospace and defense applications—including landing gear, ejection seats, rocket motor cases, and high-performance structural components—where the combination of ultrahigh strength and controlled ductility is critical for fatigue-resistant, damage-tolerant designs. This alloy family is preferred over conventional high-carbon steels when engineers need superior toughness-to-strength ratios, excellent weldability, and the ability to achieve consistent strength across thick sections through heat treatment rather than through alloying complexity.