SAE/AISI 4130 Alloy Steel (UNS G41300)
SAE/AISI 4130 steel is known for its excellent strength-to-weight ratio, good toughness, and high fatigue strength. It contains a combination of chromium and molybdenum as alloying elements, which contribute to its unique properties.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 97.03% | 98.22% |
| 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 icon 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. Here are some common applications of 4130 steel:
- Aerospace: 4130 steel is widely used in the aerospace industry for manufacturing aircraft components such as landing gear, structural tubing, brackets, and fittings.
- Automotive: In the automotive industry, 4130 steel is employed in the fabrication of various components, including chassis and roll cages.
- Oil and Gas: The oil and gas industry extensively uses 4130 steel for applications such as drill collars, drilling tools, and downhole equipment.
- Bicycle frames: 4130 steel is commonly utilized in the construction of bicycle frames due to its excellent strength and lightweight nature.
- Structural applications: Due to its high strength and formability, 4130 steel is used in various structural applications such as construction equipment, machinery frames, and supports.
- Racing and Motorsports: 4130 steel is favored in racing and motorsports industries for its combination of strength, durability, and weldability.
- Tooling and Equipment: AISI 4130 steel is employed in tooling applications such as jigs, fixtures, and molds.
- General Engineering: 4130 steel finds use in a wide range of general engineering applications, including shafts, gears, spindles, and fasteners.