SAE/AISI 4137 Alloy Steel (UNS G41370)
SAE/AISI 4137 steel is characterized by its high strength and toughness, which make it suitable for applications that require resistance to wear, impact, and fatigue. It is commonly used in the manufacturing of gears, shafts, axles, and other components that undergo high-stress conditions.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.93% | 97.85% |
| Carbon | 0.35% | 0.40% |
| Chromium | 0.80% | 1.10% |
| Manganese | 0.70% | 0.90% |
| Molybdenum | 0.15% | 0.25% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.35% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 4137 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 | 187 - 229 |
| Thermal Properties | Metric |
| Thermal Conductivity | 42.7 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 | 4.23×106 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 4137 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Relatively low corrosion resistance |
| Excellent wear resistance | Limited weldability |
| Good impact resistance | Susceptible to cracking during heat treatment |
| Suitable for high-stress applications | Requires proper heat treatment for optimal properties |
| Wide range of available sizes and forms | Requires careful machining to prevent distortion |
| Cost-effective compared to some other alloy steels |
Applications of 4137 Alloy Steel
AISI 4137 steel, with its high strength, toughness, and wear resistance, finds applications in various industries. Some common applications of AISI 4137 steel include:
- Gears and Gear Shafts: AISI 4137 steel is often used in the manufacturing of gears, particularly in heavy-duty applications. Its high strength and wear resistance make it suitable for transmitting power and withstanding the stresses of rotational motion.
- Axles and Shafts: Due to its excellent strength and toughness, AISI 4137 steel is utilized in the production of axles and shafts in automotive, aerospace, and heavy machinery industries. These components need to endure heavy loads and resist bending or breaking under extreme conditions.
- Bolts and Fasteners: AISI 4137 steel is suitable for manufacturing high-strength bolts, screws, and other fasteners. Its mechanical properties ensure the fasteners can withstand high tension and provide secure connections in various structural and mechanical applications.
- Automotive Parts: AISI 4137 steel is used in the production of various automotive components, including crankshafts, camshafts, steering components, and suspension parts. These parts require strength, toughness, and resistance to fatigue under dynamic loading conditions.
- Machine Components: AISI 4137 steel is employed in the fabrication of machine components, such as spindles, shafts, couplings, and hydraulic components. These components often operate under high stress and require the material’s superior mechanical properties.
- Tools and Dies: AISI 4137 steel is utilized in the manufacturing of tools and dies for metalworking processes. Its high wear resistance and toughness make it suitable for applications such as forming, cutting, and shaping metal parts.
- Structural Applications: In some cases, AISI 4137 steel is employed in structural applications where high strength and toughness are required, such as in the construction of bridges, buildings, and machinery frames.