SAE/AISI 4028 Alloy Steel (UNS G40280)
SAE/AISI 4028 steel is commonly used in applications that require high strength and toughness, such as gears, axles, and other heavily stressed components. It can be heat treated to achieve desired mechanical properties, including increased hardness and wear resistance.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 98.07% | 98.67% |
| Carbon | 0.25% | 0.30% |
| Manganese | 0.70% | 0.90% |
| Molybdenum | 0.20% | 0.30% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.35% |
| Sulfur | 0.035% | 0.050% |
The following table provides a list of SAE/AISI 4028 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 |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 167 - 212 |
| Thermal Properties | Metric |
| Thermal Conductivity | 44.5 W/m·K |
| Specific Heat Capacity (Cp) | 470 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.2×10-5 1/°C |
| Electrical Properties | Metric |
| Electrical Conductivity | 4.12×106 S/m |
| Electrical Resistivity | 2.43×10-7 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 4028 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Moderate hardenability |
| Good wear resistance | Limited corrosion resistance |
| Can be heat treated for desired mechanical properties | Requires proper heat treatment for optimal performance |
| Wide availability and cost-effectiveness | Susceptible to improper heat treatment or processing |
| Versatile applications in various industries | Limited elevated temperature strength |
Applications of 4028 Alloy Steel
AISI 4028 steel finds applications in various industries and components that require high strength, toughness, and wear resistance. Here are some common applications:
- Gears: AISI 4028 steel is commonly used for gears in automotive transmissions, industrial machinery, and heavy equipment.
- Axles and Shafts: AISI 4028 steel finds application in axles and shafts for automotive drive shafts and rear axles.
- Bolts and Fasteners: AISI 4028 steel is utilized in the production of bolts, studs, and fasteners in various industries.
- Heavy-Duty Machinery Components: AISI 4028 steel is suitable for components such as crankshafts, connecting rods, and forged parts.
- Tooling and Die Manufacturing: AISI 4028 steel is used in tooling and die production for applications requiring strength and wear resistance.
- Structural Components: AISI 4028 steel can be employed in the manufacturing of structural components for machinery, equipment, and vehicles.