0.09C 15.1Ni-1.2Mo Low Alloy Steel

This is a low-alloy steel with unusually high nickel (15.1%) and molybdenum (1.2%) content, combined with significant titanium (~2.3%), placing it at the boundary between conventional structural steels and nickel-based alloys. The high nickel and molybdenum levels provide enhanced strength and corrosion resistance, while the low carbon content (0.09%) maintains weldability and toughness—making this composition suitable for applications requiring a balance of strength, ductility, and environmental durability. Commonly found in aerospace structures, high-strength fasteners, and subsea/offshore equipment where superior fatigue resistance and corrosion resistance in aggressive environments are critical; the titanium addition suggests optimization for specific precipitation-hardening behavior or improved fracture toughness at service temperatures.