SAE/AISI 4130 Alloy Steel (UNS G41300)
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 | ||
|---|---|---|
| Element | Min | Max |
| Iron | 97.0% | 98.2% |
| Carbon | 0.28% | 0.33% |
| Chromium | 0.80% | 1.10% |
| Manganese | 0.40% | 0.60% |
| Molybdenum | 0.15% | 0.25% |
| Phosphorous | —— | 0.035% |
| Silicon | 0.15% | 0.35% |
| Sulfur | —— | 0.04% |
The following table provides a list of SAE/AISI 4130 properties in both SI and US customary/Imperial units.
Click on the button to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 7850 kg/m3 |
| Mechanical Properties | Metric |
| 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 Break | 25.5% |
| Reduction of Area | 60% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 197 |
| Thermal Properties | Metric |
| Thermal Conductivity | 42.7 W/m·K |
| Specific Heat Capacity (Cp) | 470 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.3×10-5 1/°C |
| Electrical Properties | Metric |
| Electrical Conductivity | 4.18×106 S/m |
| Electrical Resistivity | 2.4×10-7 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
| Advantages | Disadvantages |
|---|---|
| High strength-to-weight ratio | Limited hardenability without additional processes |
| Good toughness and fatigue strength | Moderate corrosion resistance |
| Excellent weldability and formability | Relatively high cost compared to carbon steels |
| Versatile for various fabrication processes | Requires specific heat treatment for some applications |
| Availability of various shapes and sizes | Not 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.