SAE/AISI 4028 Alloy Steel (UNS G40280)
SAE/AISI 4028 is a versatile low-alloy molybdenum steel known for its exceptional strength, toughness, and wear resistance. Commonly utilized in components subjected to heavy stress, it can be heat treated to enhance hardness and mechanical performance, making it suitable for demanding industrial applications.
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| 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 button 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. Common applications include:
- Gears: Commonly used in automotive transmissions, industrial machinery, and heavy equipment.
- Axles and Shafts: Suitable for automotive drive shafts and rear axles.
- Bolts and Fasteners: Utilized in producing bolts, studs, and fasteners for various industries.
- Heavy-Duty Machinery Components: Ideal for crankshafts, connecting rods, and forged parts.
- Tooling and Die Manufacturing: Employed in tooling and die production requiring strength and wear resistance.
- Structural Components: Used in manufacturing structural parts for machinery, equipment, and vehicles.