SAE/AISI 4027 Alloy Steel (UNS G40270)
SAE/AISI 4027 steel is often used in applications that require high tensile strength, good wear resistance, and the ability to withstand moderate loads and stresses. It is commonly utilized in gears, shafts, bolts, studs, and other components where high strength and durability are necessary.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 98.08% | 98.70% |
| Carbon | 0.25% | 0.30% |
| Manganese | 0.70% | 0.90% |
| Molybdenum | 0.20% | 0.30% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.35% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 4027 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) | 515 MPa |
| Tensile Strength (Yield) | 325 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Elongation at Break | 30% |
| Reduction of Area | 53% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 143 |
| 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 4027 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| Good strength and toughness | Moderate hardenability |
| Excellent wear resistance | Limited corrosion resistance |
| Suitable for applications requiring high tensile strength | Limited weldability |
| Good machinability | Susceptible to cracking during quenching |
| Cost-effective | Not suitable for high-temperature applications |
Applications of 4027 Alloy Steel
AISI 4027 steel, also known as SAE 4027 steel, is commonly used in various applications that require a combination of strength, wear resistance, and moderate toughness. Here are some typical applications of 4027 steel:
- Gears and Gear Shafts: Due to its good strength, wear resistance, and fatigue resistance, AISI 4027 steel is often employed in the manufacturing of gears and gear shafts. It can withstand the high stresses and sliding contact associated with gear systems.
- Bolts and Fasteners: 4027 steel’s combination of strength and toughness makes it suitable for use in bolts, studs, and fasteners. It can provide reliable and secure connections in mechanical assemblies.
- Axles and Shafts: The high tensile strength and good fatigue resistance of 4027 steel make it suitable for applications involving axles and shafts in machinery, vehicles, and equipment.
- Machine Components: AISI 4027 steel finds application in various machine components, including crankshafts, camshafts, spindles, and connecting rods. Its properties make it well-suited for enduring high loads, cyclic stresses, and wear.
- Tooling and Tool Holders: The wear resistance and strength of 4027 steel make it suitable for tooling applications, such as punches, dies, and tool holders. It can withstand the forces and abrasive wear associated with metalworking operations.
- Automotive Parts: AISI 4027 steel can be found in certain automotive components that require strength and wear resistance, such as transmission gears, axle shafts, and steering components.
- Construction Equipment: It may be utilized in construction machinery parts, such as excavator components, loader arms, and hydraulic cylinders, where high strength and durability are required.