SAE/AISI 8620 Alloy Steel (UNS G86200)
SAE/AISI 8620 steel is a good choice for applications where a combination of hardenability, wear resistance, and toughness is required. It is also relatively easy to machine, making it a cost-effective choice for many applications.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.895% | 98.02% |
| Carbon | 0.18% | 0.23% |
| Chromium | 0.40% | 0.60% |
| Manganese | 0.70% | 0.90% |
| Molybdenum | 0.15% | 0.25% |
| Nickel | 0.40% | 0.70% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.35% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 8620 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) | 530 MPa |
| Tensile Strength (Yield) | 385 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Elongation at Break | 10% |
| Reduction of Area | 35% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 149 |
| Izod Impact | 115 J |
| Thermal Properties | Metric |
| Thermal Conductivity | 46.6 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 8620 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Relatively low hardenability |
| Good wear resistance | Limited corrosion resistance |
| Versatility for a wide range of applications | Not suitable for high-temperature applications |
| Good machinability | Requires proper heat treatment for optimal properties |
| Can be readily welded | Cost may be higher compared to some standard steels |
Applications of 8620 Alloy Steel
AISI 8620 steel finds application in various industries where a combination of high strength, toughness, and wear resistance is required. Some common applications of 8620 steel include:
- Gears and Gearboxes: AISI 8620 steel is widely used in the production of gears and gearboxes due to its excellent combination of strength, toughness, and wear resistance.
- Shafts and Axles: 8620 steel is commonly used for manufacturing shafts and axles in machinery and automotive applications.
- Camshafts: Due to its high strength and excellent wear resistance, AISI 8620 steel is utilized in the production of camshafts for engines.
- Pinions and Sprockets: 8620 steel is preferred for pinions and sprockets, especially in power transmission systems.
- Bushings and Bearings: The combination of high strength, hardness, and good machinability makes 8620 steel suitable for manufacturing bushings and bearings.
- Tool and Die Components: AISI 8620 steel is used for tool and die components that require high strength and toughness.
- Structural Parts: In certain applications, 8620 steel is employed for structural components that require high strength and impact resistance.
- Aerospace Applications: AISI 8620 steel is utilized in aerospace applications, including landing gear components, structural elements, and gears.