SAE/AISI 1340 Carbon Steel (UNS G13400)
SAE/AISI 1340 steel exhibits good strength and toughness, making it suitable for applications that require high load-bearing capacity. It is commonly used in the manufacture of forged components, such as axles, crankshafts, gears, and other mechanical parts.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 97.25% | 97.87% |
| Carbon | 0.38% | 0.43% |
| Manganese | 1.60% | 1.90% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.35% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 1340 properties in both SI and US customary/Imperial units.
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 7870 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 703 MPa |
| Tensile Strength (Yield) | 434 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Elongation at Break | 26% |
| Reduction of Area | 57% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 207 |
| Thermal Properties | Metric |
| Thermal Conductivity | 52 W/m·K |
| Specific Heat Capacity (Cp) | 470 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.15×10-5 1/°C |
| Electrical Properties | Metric |
| Electrical Conductivity | 4.18×106 S/m |
| Electrical Resistivity | 2.4×10-7 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 1340 Carbon Steel
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Limited corrosion resistance |
| Good wear resistance | Susceptible to cracking under high stress |
| Suitable for heavy-duty applications | Requires proper heat treatment for optimal properties |
| Versatile and widely available | Relatively higher carbon content may lead to lower weldability |
| Cost-effective option | Not as impact-resistant as some other alloys |
| Can be easily machined and fabricated | Requires careful handling to prevent deformation during heat treatment |
Applications of 1340 Carbon Steel
1340 carbon steel finds applications in various industries due to its desirable mechanical properties. Here are some common applications of 1340 carbon steel:
- Axles and Shafts: 1340 carbon steel is often used for manufacturing axles and shafts in automotive, heavy machinery, and transportation industries. Its high strength and toughness make it suitable for handling heavy loads and resisting wear.
- Gears and Gear Components: The excellent wear resistance of 1340 carbon steel makes it well-suited for gears and gear components. It can withstand the high stresses and abrasive forces associated with power transmission and motion control systems.
- Crankshafts: Crankshafts in engines require high strength and durability. 1340 carbon steel’s mechanical properties make it an appropriate choice for manufacturing crankshafts that can withstand the alternating stresses and rotational forces.
- Forged Components: The forgeability of 1340 carbon steel makes it suitable for producing various forged components such as connecting rods, flanges, and other heavy-duty industrial parts. Its strength and toughness allow for reliable performance in demanding applications.
- Tooling and Machine Components: Due to its versatility and machinability, 1340 carbon steel is used for producing tooling components, such as dies, punches, and cutting tools. It provides the necessary hardness and wear resistance required for these applications.
- Structural Components: In certain cases, 1340 carbon steel may be used in the construction of structural components, especially in applications where moderate strength and toughness are required.
- General Industrial Applications: 1340 carbon steel can also be found in various general industrial applications, such as shafts for machinery, pins, bolts, and fasteners. Its availability, cost-effectiveness, and suitable mechanical properties make it a practical choice for these applications.