SAE/AISI 4620 Alloy Steel (UNS G46200)
SAE/AISI 4620 is a nickel-molybdenum alloy steel that is known for its excellent strength, toughness, and hardenability. It is commonly used in applications where high performance and wear resistance are critical, such as gears, bearings, shafts, and automotive components.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.405% | 97.38% |
| Carbon | 0.17% | 0.22% |
| Manganese | 0.45% | 0.65% |
| Molybdenum | 0.20% | 0.30% |
| Nickel | 1.65% | 2.0% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.35% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 4620 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) | 510 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 | 31% |
| Reduction of Area | 60% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 149 |
| Thermal Properties | Metric |
| Thermal Conductivity | 44.5 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 4620 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High hardenability, can be hardened throughout its cross-section during heat treatment | Moderate weldability, requires preheating and special welding procedures |
| Good strength and toughness properties | Lower corrosion resistance compared to stainless steels |
| Excellent wear resistance, suitable for heavy-duty applications | Relatively high cost compared to plain carbon steels |
| Wide availability and established material specifications | May require additional surface treatments for enhanced corrosion resistance |
Applications of 4620 Alloy Steel
AISI 4620 steel finds application in various industries and for different components that require specific mechanical properties. Some common applications of 4620 steel include:
- Gears and Gear Components: Due to its high strength, toughness, and wear resistance, AISI 4620 steel is commonly used in the production of gears, gear shafts, and other gear components.
- Crankshafts: 4620 steel is utilized in the manufacturing of crankshafts for engines and rotating machinery.
- Heavy-Duty Shafts: AISI 4620 steel is employed in the construction of heavy-duty shafts, such as transmission shafts, axle shafts, and drive shafts.
- Bolts and Fasteners: 4620 steel’s combination of strength and toughness makes it suitable for the production of bolts, studs, and other fasteners.
- Automotive Components: The automotive industry utilizes AISI 4620 steel in various applications, including axle components, camshafts, steering components, and suspension parts.
- Construction Machinery: Components in construction and earthmoving machinery, such as pins, bushings, and wear-resistant parts, can be made from 4620 steel.
- Agricultural Equipment: AISI 4620 steel can be found in agricultural equipment components such as spindles, shafts, and gears.