5.2Cr-1.7Mo-11.0Ni Low Alloy Steel

5.2Cr-1.7Mo-11.0Ni is a precipitation-hardening low-alloy steel designed to achieve very high strength through age-hardening heat treatment, combining chromium and molybdenum for hardenability with substantial nickel content for toughness and corrosion resistance. This material is primarily used in aerospace and defense applications where both extreme strength and damage tolerance are critical—particularly in landing gear, fasteners, and structural components that must survive high-cycle fatigue and occasional impact. The high nickel and chromium content also provides good corrosion resistance compared to conventional steels, making it suitable for environments with salt spray or chemical exposure, while the controlled molybdenum level ensures through-hardening without excessive brittleness.