The characteristics and scope of application of 4140 steel: strength, high hardenability, good toughness, small deformation during quenching, high creep resistance and long-lasting high temperature resistance. It is used to make forgings that require higher strength and larger quench section than 35CrMo steel, such as large locomotive traction gears, supercharger drive gears, rear axles, connecting rods and spring clips with heavy loads, and also It can be used for deep oil well drilling pipe joints and salvage tools below 2000m. It can be used to make bolts, screws, studs, nuts and other fasteners.
Due to its excellent toughness, wear resistance, impact resistance and high fatigue resistance, it is widely used in many industries.
