SAE/AISI 4620 Alloy Steel (UNS G46200)
SAE/AISI 4620 is a low-alloy steel containing nickel and molybdenum, prized for its high strength, excellent hardenability, and good toughness. Its mechanical properties make it ideal for critical load-bearing applications and components requiring surface wear resistance.
Looking to buy steel?
Check pricing and availability through our trusted partner:
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.40% | 97.38% |
| Carbon | 0.17% | 0.22% |
| Manganese | 0.45% | 0.65% |
| Molybdenum | 0.20% | 0.30% |
| Nickel | 1.65% | 2.00% |
| 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 button 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 is widely used in demanding engineering environments for components requiring strength, toughness, and wear resistance, including:
- Gears and Gear Components: Due to its high strength, toughness, and wear resistance, it is commonly used in the production of gears, gear shafts, and other gear components.
- Crankshafts: Utilized in the manufacturing of crankshafts for engines and rotating machinery.
- Heavy-Duty Shafts: Employed in the construction of heavy-duty shafts, such as transmission shafts, axle shafts, and drive shafts.
- Bolts and Fasteners: Its combination of strength and toughness makes it suitable for the production of bolts, studs, and other fasteners.
- Automotive Components: Used in various automotive 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, are often made from this alloy.
- Agricultural Equipment: Found in agricultural equipment components such as spindles, shafts, and gears.