0.09C 5.4Cr-1.8Mo-11.8Ni Low Alloy Steel

This is a low-alloy, nickel-chromium-molybdenum steel engineered for high-strength structural applications requiring good fracture toughness and fatigue resistance at moderate temperatures. The high nickel content (11.8%) combined with chromium and molybdenum additions provides exceptional hardenability and through-hardening capability, making this alloy suitable for large or thick-section components where uniform strength is critical. This material family is commonly encountered in aerospace fasteners, landing gear components, and heavy-duty industrial machinery where the combination of strength and damage tolerance is essential, and where alternatives like martensitic stainless steels or precipitation-hardening alloys would be less suitable.