WHAT IS THE DIFFERENCE BETWEEN 4130 AND 4340

 4130 steel, as 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. 4130 steel is used for many different industries including the automotive, aerospace ,hydraulic cylinder rod, cylidner barrel and machining industries.

4340 steel, as nickel-chromium-molybdenum alloy steel, 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.

4340 steels are used in a variety of industries for different applications including the automotive, aerospace, and tooling industries.

Chemical Composition Comparison: 4130 vs 4340 steel

StandardGradeCMnPSSiCrMoNi
ASTM A2943400.38-0.430.60-0.800.0350.0400.15-0.350.70-0.900.20-0.301.65-2.00
41300.28-0.330.40-0.600.0350.0400.15-0.350.80-1.100.15-0.25

Mechanical Properties: 4130 vs 4340 steel

Below are the mechanical properties for both normalized and annealed 4130 steel and 4340 steel.

  • Normalized
 41304340
Tensile Strength97,000 psi185,500 psi
Yield Strength63,000 psi125,000 psi
Elongation (2″)25.5%12.2%
Reduction in Area59.5%36.3%
Brinell Hardness197363
  • Annealed
 41304340
Tensile Strength81,300 psi108,000 psi
Yield Strength52,300 psi68,500 psi
Elongation (2″)28.2%22.0%
Reduction in Area55.6%49.9%
Brinell Hardness156217

Datong Group as a leading manufacturer of 4130 and 4340 steel materials,we are very professional in 4130/4340 steel tubes,4130/4340 steel rods, 4130/4340 hard chrome bar,4130/4340 cylinder barrel.

Contact us for a quote or any technical queries. We’d like to hear from you.

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