SAE/AISI 3140 Alloy Steel (UNS G31400)
SAE/AISI 3140 steel is often used in applications where strength, toughness, and wear resistance are required. It can be heat treated to achieve different hardness levels, which makes it suitable for various engineering components such as gears, shafts, axles, and other mechanical parts.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.10% | 97.10% |
| Carbon | 0.38% | 0.43% |
| Chromium | 0.55% | 0.75% |
| Manganese | 0.70% | 0.90% |
| Nickel | 1.10% | 1.40% |
| Phosphorous | 0.04% | |
| Silicon | 0.15% | 0.35% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 3140 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) | 790 MPa |
| Tensile Strength (Yield) | 520 MPa |
| Elongation at Break | 25% |
| Reduction of Area | 55% |
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 3140 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| Good strength and toughness | Limited hardenability |
| Wear resistance | Moderate machinability |
| Good resistance to corrosion | Susceptible to cracking during welding |
| Can be heat treated to desired hardness levels | Requires careful heat treatment to avoid brittleness |
| Versatile and widely available | Higher cost compared to some plain carbon steels |
Applications of 3140 Alloy Steel
AISI 3140 carbon steel finds application in various industries and engineering sectors where a combination of strength, toughness, and wear resistance is required. Some common applications of 3140 carbon steel include:
- Gears and Shafts: AISI 3140 steel’s good strength and wear resistance make it suitable for use in gears, shafts, and other power transmission components.
- Axles and Bolts: The medium carbon content of 3140 steel, along with its strength and toughness, makes it suitable for use in axles and bolts.
- Machine Components: 3140 carbon steel is utilized in various machine components, including crankshafts, connecting rods, and spindles.
- Forgings and Springs: Due to its excellent heat-treatability, AISI 3140 steel is often used in the manufacturing of forgings, such as forged crankshafts, and springs.
- Wear-resistant Parts: The wear resistance of AISI 3140 steel makes it suitable for components subjected to abrasive or erosive conditions.
- General Engineering: AISI 3140 steel’s versatility and availability make it a viable option for a range of general engineering applications.