SAE/AISI 8622 Alloy Steel (UNS G86220)
SAE/AISI 8622 is a versatile nickel-chromium-molybdenum alloy steel prized for its high strength, toughness, and excellent wear resistance. This grade is widely utilized in applications requiring superior mechanical properties and can be heat treated to optimize performance across various industries.
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| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.9% | 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.
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| 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’s excellent combination of strength, toughness, and wear resistance supports diverse industrial uses, including:
- Gears and Gear Shafts: Often used for manufacturing gears in applications demanding high strength, durability, and wear resistance.
- Automotive Components: Suitable for crankshafts, camshafts, transmission parts, and connecting rods due to its toughness and impact resistance.
- Machinery and Equipment: Utilized in shafts, spindles, couplings, and fasteners across various machinery and equipment.
- Aerospace Applications: Applied in landing gear parts, engine components, and structural elements requiring strength and toughness.
- Tooling and Dies: Employed in manufacturing punches, dies, molds, and other tooling components owing to its machinability and wear resistance.
- Oil and Gas Industry: Used in drill collars, subs, and shafts within drilling equipment.