SAE/AISI 8622 Alloy Steel (UNS G86220)
SAE/AISI 8622 is a nickel-chromium-molybdenum alloy steel that is commonly used in applications where high strength and toughness are required. It is a versatile grade of steel that can be heat treated to achieve a wide range of mechanical properties.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.925% | 98.0% |
| Carbon | 0.20% | 0.25% |
| 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% | 0.30% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 8622 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 |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Thermal Properties | Metric |
| Thermal Conductivity | 46.6 W/m·K |
| Specific Heat Capacity (Cp) | 470 J/kg·K |
| 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 8622 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Limited hardenability compared to some steels |
| Good wear resistance | Moderate weldability |
| Enhanced impact resistance | Prone to distortion during heat treatment |
| Excellent machinability | Susceptible to surface scaling if improperly heat treated |
| Good core strength and ductility | Relatively low corrosion resistance |
| Cost-effective compared to some high-alloy steels |
Applications of 8622 Alloy Steel
AISI 8622 steel, with its desirable combination of strength, toughness, and wear resistance, finds applications in various industries. Some common applications of AISI 8622 steel include:
- Gears and Gear Shafts: AISI 8622 steel is often used for manufacturing gears, particularly in applications that require high strength, durability, and wear resistance.
- Automotive Components: The steel's good toughness and impact resistance make it suitable for various automotive components, such as crankshafts, camshafts, transmission parts, and connecting rods.
- Machinery and Equipment: AISI 8622 steel is utilized in the production of various machinery and equipment components, including shafts, spindles, couplings, and fasteners.
- Aerospace Applications: AISI 8622 steel's combination of strength and toughness makes it suitable for certain aerospace applications, such as landing gear parts, engine components, and structural elements.
- Tooling and Dies: Due to its good machinability and wear resistance, AISI 8622 steel is employed in tooling and die applications for manufacturing punches, dies, molds, and other components.
- Oil and Gas Industry: AISI 8622 steel is sometimes utilized in the oil and gas industry for applications such as drill collars, subs, and shafts used in drilling equipment.