4140 steel is American ultra-high-strength steel, with high strength and toughness, good hardenability, no obvious temper brittleness, small deformation during quenching, high fatigue limit and multiple impact resistance after quenching and tempering. Ability, good low-temperature impact toughness, high creep strength and lasting strength at high temperature. The steel is usually quenched and tempered and surface quenched as a heat treatment plan.
It is used to manufacture forgings that require higher strength and larger quenched and tempered section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods and spring clips that are heavily loaded, and can also be used Drill pipe joints and fishing tools for oil deep wells below 2000m.
4140 steel. This steel has good workability, small processing deformation, and good fatigue resistance. It is a medium-sized hardenable steel. After heat treatment, 4140 has good strength and good comprehensive mechanical properties, good manufacturability, and yield High. The maximum operating temperature is 427 degrees Celsius.
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