4130 and 4340 are both popular steel grades at Capital Steel & Wire. Below is a chemical and mechanical properties comparison of both grades of steel as it may be of value for machining purposes and as a resource for purchasing 4130 and 4340 steel.
This low alloy steel contains high amounts of chromium and is often referred to as chromoly. 4130 steel has good machinability, ductility, weldability and strength characteristics. It is used for many different industries including the automotive, aerospace and machining industries.
This nickel-chromium-molybdenum alloy streel is a very high strength steel. It is sought after for its toughness and for being used as a steel that will be highly stressed.
It is used in a variety of industries for different applications including the automotive, aerospace, and tooling industries.
The chemical properties of 4130 and 4140 steel have differences in carbon, manganese and chromium concentrations.
|Phosphorus, P (max)||0.035%||0.035%|
|Sulfur, S (max)||0.040%||0.040%|
The following are the mechnical properties for both normalized and annealed 4130 and 4340 steel.
|Tensile Strength||97,000 psi||185,500 psi|
|Yield Strength||63,000 psi||125,000 psi|
|Reduction in Area||59.5%||36.3%|
|Tensile Strength||81,300 psi||108,000 psi|
|Yield Strength||52,300 psi||68,500 psi|
|Reduction in Area||55.6%||49.9%|
The relative machinability Rating percentage based on SAE1212 as 100% is the following for cold drawn 4130 and cold drawn 4340 steel
- 4130 - 70%
- 4340 - 50%
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