SAE/AISI 4150 Alloy Steel (UNS G41500)
SAE/AISI 4150 is a high-strength alloy steel that is known for its excellent hardenability, good toughness, and high tensile strength. It is commonly used in applications that require high strength and wear resistance, such as gears, shafts, bearings, and other components that are subjected to high stress levels.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.745% | 97.67% |
| Carbon | 0.48% | 0.53% |
| Chromium | 0.80% | 1.10% |
| Manganese | 0.75% | 1.0% |
| Molybdenum | 0.15% | 0.25% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.30% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 4150 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) | 731 MPa |
| Tensile Strength (Yield) | 380 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Elongation at Break | 20% |
| Reduction of Area | 40% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 197 |
| Thermal Properties | Metric |
| Thermal Conductivity | 44.5 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 | 4.23×106 S/m |
| Electrical Resistivity | 2.36×10-7 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 4150 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and hardness | Relatively low corrosion resistance |
| Good toughness and impact resistance | Challenging to machine after heat treatment |
| Excellent wear resistance | Susceptible to distortion during heat treatment |
| Good machinability in annealed state | Requires proper heat treatment for optimum properties |
| Versatile and widely available | Higher cost compared to low-carbon steels |
Applications of 4150 Alloy Steel
AISI 4150 steel is used in a variety of applications where high strength, toughness, and wear resistance are required. Some common applications of AISI 4150 steel include:
- Gears and Gear Shafts: AISI 4150 steel’s high strength, hardness, and wear resistance make it suitable for manufacturing gears and gear shafts used in machinery, automotive transmissions, and heavy-duty equipment.
- Axles and Shafts: The excellent combination of strength and toughness of AISI 4150 steel makes it a preferred choice for manufacturing axles and shafts in automotive applications, such as truck axles, crankshafts, and axle shafts.
- Piston Rods: AISI 4150 steel’s high strength, hardness, and resistance to wear make it suitable for manufacturing piston rods used in hydraulic and pneumatic cylinders, providing reliable performance under heavy loads.
- Bolts and Fasteners: AISI 4150 steel’s high tensile strength, toughness, and resistance to fatigue make it ideal for producing bolts, studs, and fasteners used in demanding applications, such as heavy machinery, construction equipment, and structural components.
- Tooling and Die Components: The combination of hardness, wear resistance, and machinability of AISI 4150 steel makes it suitable for tooling and die components, such as punches, dies, molds, and cutting tools, in industries including manufacturing, forging, and stamping.
- Heavy-Duty Machine Parts: AISI 4150 steel is utilized in the manufacturing of various heavy-duty machine parts, including crankshafts, gears, couplings, and spindles, where high strength, toughness, and resistance to wear and impact are crucial for reliable operation.
- Oil and Gas Industry Components: AISI 4150 steel’s properties make it suitable for components used in the oil and gas industry, such as drill collars, stabilizers, and shafts, where strength, toughness, and resistance to corrosive environments are vital.
- Automotive Components: AISI 4150 steel is employed in the production of various automotive components, including steering components, suspension parts, and transmission components, where high strength, toughness, and durability are necessary.