SAE 4130 Steel Tube Tensile Strength and Hardness

SAE 4130 Steel has good machinability, good weldability, and can be heat treated. SAE 4130 Steel Tube is commonly used in structural applications, including gears, fasteners, and welded tubing.

SAE 4130 Steel Tube Chemical Composition

Component	Wt. %
C	0.28 - 0.33
Cr	0.8 - 1.1
Fe	97.3 - 98.22
Mn	0.4 - 0.6
Mo	0.15 - 0.25
P	Max 0.035
S	Max 0.04
Si	0.15 - 0.35

Mechanical Properties of SAE 4130 Steel
Hardness, Brinell	197	197
Hardness, Knoop	219	219	Converted from Brinell hardness.
Hardness, Rockwell B	92	92	Converted from Brinell hardness.
Hardness, Rockwell C	13	13	Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only.
Hardness, Vickers	207	207	Converted from Brinell hardness.
Tensile Strength, Ultimate	670MPa	97200psi
Tensile Strength, Yield	435MPa	63100psi
Elongation at Break	25.5%	25.5%	in 50 mm
Reduction of Area	60%	60%
Modulus of Elasticity	205GPa	29700ksi	Typical for steel
Bulk Modulus	140GPa	20300ksi	Typical for steel
Poisson's Ratio	0.29	0.29	Calculated
Izod Impact	87J	64.2ft-lb
Machinability	70%	70%	annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	80GPa	11600ksi	Typical for steel

SAE 4130 Steel Tube Tempering

Tempering is carried out to relieve stresses from the hardening process, but primarily to obtain mechanical properties required for the final application. The actual

tempering temperature will be chosen to meet the required properties.

Machinablity of SAE 4130 Steel Tube

The alloy is readily machinable. Simple shapes might be machined following a normalizing treatment, whereas more complex shapes will require annealing.

SAE 4130 Steel Tube Weldability

Weldability of 4130 is good, and the alloy may be welded using any commercial method. The material may require a post-weld stress relief heat treatment in certain instances.

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