SAE/AISI 4815 Alloy Steel (UNS G82150)
SAE/AISI 4815 is a low-alloy nickel-molybdenum steel recognized for its excellent strength, toughness, and hardenability. Frequently used in demanding mechanical applications, it performs well in components requiring high wear resistance and structural integrity, such as gears, shafts, and bearings under stress or heavy load conditions.
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| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 94.79% | 95.87% |
| Carbon | 0.13% | 0.18% |
| Manganese | 0.40% | 0.60% |
| Molybdenum | 0.20% | 0.30% |
| Nickel | 3.25% | 3.75% |
| Phosphorous | —— | 0.035% |
| Silicon | 0.15% | 0.30% |
| Sulfur | —— | 0.04% |
The following table provides a list of SAE/AISI 4815 properties in both SI and US customary/Imperial units.
Click on the button to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 7850 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 550 MPa |
| Tensile Strength (Yield) | 370 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Elongation at Break | 23% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 170 |
| Thermal Properties | Metric |
| Thermal Conductivity | 44.5 W/m·K |
| Specific Heat Capacity (Cp) | 470 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.2×10-5 1/°C |
| Electrical Properties | Metric |
| Electrical Conductivity | 3.83×106 S/m |
| Electrical Resistivity | 2.61×10-7 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 4815 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength | More expensive than carbon steel |
| High toughness | More difficult to weld than carbon steel |
| Corrosion resistance | Can be susceptible to hydrogen embrittlement |
| Heat resistance | Can be difficult to machine |
Applications of 4815 Alloy Steel
Due to its strength, toughness, and resistance to heat and corrosion, AISI 4815 steel is well-suited for demanding engineering environments, including:
- Boiler and furnace components: Used in a variety of components in boilers and furnaces, such as tubes, headers, and drums.
- Pressure vessels: Used in pressure vessels, such as storage tanks and reactors.
- Gears: Used in gears that require high strength and toughness, such as those used in heavy machinery.
- Shafts: Used in shafts that require high strength and toughness, such as those used in engines and turbines.
- Tools: Used in tools that require high strength and toughness, such as hammers and wrenches.
- Machinery: Used in machinery that requires high strength and toughness, such as lathes and milling machines.
- Automotive parts: Used in automotive parts that require high strength and toughness, such as axles and crankshafts.
- Welding electrodes: Used in welding electrodes that require high strength and toughness, such as those used in shipbuilding and construction.