Comparison 4140 Steel VS 4130 Steel Material

ASTM A29/A29M-AISI 4140 and 4130 Steel, Both are Alloy Structural Steel. Normal use in oil and gas industry. Typical application as gears, connection rods, collets, stem assemblies, conveyor pins, pump shafts and tool holders.

AISI 4140 steel VS 4130 Steel chemical composition

C Si Mn S P Cr Mo
AISI 4140 0.38～0.43 0.15～0.35 0.75～1.00 ≤0.035 ≤0.040 0.80～1.10 0.15～0.25
AISI 4130 0.28～0.33 0.15～0.35 0.40～0.60 ≤0.035 ≤0.040 0.80～1.10 0.15～0.25

4140 steel VS 4130 Steel

By comparing the Chemical Composition of Alloy Steel AISI 4140 and 4130, we can know some 4140 and 4130 Chemical properties and physical properties have what different point.

sae 4140 steel VS 4130 Steel welding properties

4130 have lower Carbon composition, so 4130 is easier welding than AISI 4140 steel. And 4130 have lower Manganese than 4140. So 4130’s Wear-resisting performance is lower than 4140.

sae 4140 VS 4130 Steel Rust resistance properties

4140 steel have higher carbon, but sae 4140 have higher Mn composition.  so their rust is very same.

AISI 4140 VS 4130 Steel mechanical behavior (mechanical properties)

The mechanical properties of AISI 4140 steel VS 4130 Steel are outlined in the following table.

AISI SAE 4140 Steel AISI SAE 4130 Steel
Properties (behavior) Metric Properties (behavior) Metric
Tensile strength, Ultimate 655 MPa Tensile strength, Ultimate 560 MPa
Tensile strength, Yield 415 MPa Tensile strength, Yield 460 MPa
Modulus of elasticity 190-210 MPa Modulus of elasticity 190-210 MPa
Bulk modulus 140 GPa Bulk modulus 140 GPa
Shear modulus 80 GPa Shear modulus 80 GPa
Poisson ratio 0.27-0.30 Poisson ratio 0.27-0.30
Elongation at break (in 50 mm) 25.7 % Elongation at break (in 50 mm) 21.5%
Reduction of area 45 Reduction of area 59.6
Hardness, Brinell (Annealing) 217 Max Hardness, Brinell (Annealing) 217 Max
Hardness, Rockwell C (Q+T) 22 Hardness, Rockwell C (Q+T) 22

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