SAE/AISI 4130 Alloy Steel (UNS G41300)

Image of SAE/AISI 4130 bars

SAE/AISI 4130 alloy steel is renowned for its exceptional strength-to-weight ratio, toughness, and fatigue resistance. Enriched with chromium and molybdenum, this low-alloy steel delivers outstanding mechanical properties and versatility, making it a preferred choice for diverse engineering and industrial applications worldwide.

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Chemical Composition
ElementMinMax
Iron97.03%98.22%
Carbon0.28%0.33%
Chromium0.80%1.10%
Manganese0.40%0.60%
Molybdenum0.15%0.25%
Phosphorous0.035%
Silicon0.15%0.35%
Sulfur0.04%

The following table provides a list of SAE/AISI 4130 properties in both SI and US customary/Imperial units.

Click on the icon to switch between Metric and Imperial units.

Table of SAE/AISI 4130 Properties
Physical Properties
Metric
Density7850 kg/m3
Mechanical PropertiesMetric
Tensile Strength (Ultimate)670 MPa
Tensile Strength (Yield)435 MPa
Young’s Modulus (E)190 - 210 GPa
Bulk Modulus (K)140 GPa
Shear Modulus (G)80 GPa
Elongation at Break25.5%
Reduction of Area60%
Poisson’s Ratio (ν)0.27 - 0.30
Brinell Hardness197
Thermal PropertiesMetric
Thermal Conductivity42.7 W/m·K
Specific Heat Capacity (Cp)470 J/kg·K
Coefficient of Thermal Expansion (αL)1.3×10-5 1/°C
Electrical PropertiesMetric
Electrical Conductivity4.18×106 S/m
Electrical Resistivity2.4×10-7 Ω·m

The values in this table are approximate and can vary depending on various factors such as the specific manufacturing process and heat treatment applied to the alloy.

Advantages & Disadvantages of 4130 Alloy Steel

AdvantagesDisadvantages
High strength-to-weight ratioLimited hardenability without additional processes
Good toughness and fatigue strengthModerate corrosion resistance
Excellent weldability and formabilityRelatively high cost compared to carbon steels
Versatile for various fabrication processesRequires specific heat treatment for some applications
Availability of various shapes and sizesNot suitable for high-temperature applications

Applications of 4130 Alloy Steel

AISI 4130 steel finds applications in a wide range of industries due to its desirable properties, including:

  • Aerospace: Widely used for manufacturing aircraft components such as landing gear, structural tubing, brackets, and fittings.
  • Automotive: Employed in fabricating components including chassis and roll cages.
  • Oil and Gas: Commonly applied in drill collars, drilling tools, and downhole equipment.
  • Bicycle Frames: Favored for constructing frames due to its excellent strength and lightweight nature.
  • Structural Applications: Used in construction equipment, machinery frames, and supports owing to its high strength and formability.
  • Racing and Motorsports: Preferred for its strength, durability, and weldability in racing industries.
  • Tooling and Equipment: Utilized in tooling applications such as jigs, fixtures, and molds.
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