SAE/AISI 8630 Alloy Steel (UNS G86300)
SAE/AISI 8630 is a nickel-chromium-molybdenum alloy steel that is known for its high strength, toughness, and hardenability. It is a versatile material that can be used in a wide variety of applications, including automotive parts, gears, shafts, and tooling.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.745% | 98.02% |
| Carbon | 0.28% | 0.33% |
| Chromium | 0.40% | 0.60% |
| Manganese | 0.65% | 0.95% |
| Molybdenum | 0.15% | 0.25% |
| Nickel | 0.35% | 0.75% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.30% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 8630 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) | 620 MPa |
| Tensile Strength (Yield) | 550 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 72 GPa |
| Elongation at Break | 16% |
| 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 |
| Coefficient of Thermal Expansion (αL) | 1.12×10-5 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 8630 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and hardness | Limited corrosion resistance |
| Excellent toughness | Relatively high cost compared to carbon steels |
| Good wear resistance | Requires proper heat treatment for optimal properties |
| High fatigue resistance | Reduced tool life during machining |
| Good weldability | Susceptible to cracking if improperly welded |
Applications of 8630 Alloy Steel
AISI 8630 steel finds applications in various industries where a combination of high strength, toughness, and good fatigue resistance is required. Here are some common applications of 8630 steel:
- Gears and Gear Shafts: AISI 8630 steel is often used in the manufacturing of gears and gear shafts due to its excellent strength, toughness, and wear resistance.
- Aircraft and Aerospace Components: The high strength, hardenability, and fatigue resistance of 8630 steel make it suitable for aircraft and aerospace applications.
- Oil and Gas Industry: 8630 steel is widely utilized in the oil and gas industry due to its ability to withstand high stress and fatigue.
- Automotive Industry: In the automotive sector, AISI 8630 steel is employed in applications requiring high strength and toughness.
- Machinery and Tooling: 8630 steel is utilized in the manufacturing of various machinery and tooling components.
- Mining Equipment: Due to its robustness and ability to withstand heavy loads, 8630 steel is used in mining equipment.
- Power Generation: AISI 8630 steel is employed in power generation equipment, including turbine shafts and generator components.