SAE/AISI 4615 Alloy Steel (UNS G43350)
SAE/AISI 4615 is a nickel-molybdenum low-alloy steel prized for its strength, toughness, and excellent machinability. It is widely used in demanding applications such as automotive components, gears, shafts, and high-strength fasteners, where durability and wear resistance are critical.
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| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.49% | 97.42% |
| Carbon | 0.13% | 0.18% |
| Manganese | 0.45% | 0.65% |
| Molybdenum | 0.20% | 0.30% |
| Nickel | 1.65% | 2.00% |
| Phosphorous | —— | 0.035% |
| Silicon | 0.15% | 0.30% |
| Sulfur | —— | 0.04% |
The following table provides a list of SAE/AISI 4615 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 |
| Young’s Modulus (E) | 205 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Poisson’s Ratio (ν) | 0.29 |
| Brinell Hardness | 170 - 212 |
| Thermal Properties | Metric |
| Thermal Conductivity | 44.5 W/m·K |
| Specific Heat Capacity (Cp) | 470 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.1×10-5 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 4615 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Relatively high cost compared to carbon steels |
| Excellent hardenability | Requires precise heat treatment for optimal properties |
| Good wear resistance | Limited availability and potential lead times |
| High impact toughness | Lower corrosion resistance compared to stainless steels |
| Versatile for various applications | Can be more challenging to machine than softer steels |
Applications of 4615 Alloy Steel
Due to its combination of strength, toughness, and wear resistance, SAE/AISI 4615 steel is used across multiple industries, including:
- Gears and Gear Shafts: Its excellent hardness and toughness make it ideal for manufacturing gears and gear shafts.
- Axles and Shafts: High strength and impact resistance support use in axles and structural shafts.
- Bolts and Fasteners: Offers the strength and wear resistance needed for durable bolts, screws, and other fasteners.
- Machine Components: Common in parts like crankshafts, camshafts, and couplings due to robust mechanical properties.
- Tooling and Die Components: Suited for die sets and tooling parts where wear resistance is critical.
- Automotive Parts: Used in transmission, steering, and suspension systems across automotive applications.
- Construction and Heavy Equipment: Applied in shafts, pins, and load-bearing parts in construction and industrial equipment.