SAE/AISI 1144 Carbon Steel (UNS G11440)
SAE/AISI 1144 steel is a versatile material that can be used in a wide variety of applications. It is a good choice for applications where good machinability and high strength are required.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 97.50% | 98.01% |
| Carbon | 0.40% | 0.48% |
| Manganese | 1.35% | 1.65% |
| Phosphorous | 0.04% | |
| Sulfur | 0.24% | 0.33% |
The following table provides a list of SAE/AISI 1144 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) | 745 MPa |
| Tensile Strength (Yield) | 620 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Elongation at Break | 10% |
| Reduction of Area | 30% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 217 |
| Thermal Properties | Metric |
| Thermal Conductivity | 51 W/m·K |
| Specific Heat Capacity (Cp) | 470 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.3×10-5 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 1144 Carbon Steel
| Advantages | Disadvantages |
|---|---|
| High Strength | Limited Weldability |
| Improved Machinability | Lower Toughness |
| Good Wear Resistance | Limited Hardenability |
| Cost-Effective | Corrosion Susceptibility |
Applications of 1144 Carbon Steel
AISI 1144 carbon steel finds application in various industries where a combination of high strength, good machinability, and wear resistance is required. Here are some common applications:
- Machined Components: AISI 1144 steel’s excellent machinability makes it suitable for producing various machined components such as shafts, pins, bushings, spindles, and gears. Its improved chip control and reduced tool wear contribute to efficient machining operations.
- Fasteners: Due to its high strength and good mechanical properties, 1144 carbon steel is often used in the production of fasteners like bolts, studs, screws, and rivets. These components require reliable strength and load-bearing capacity.
- Automotive Parts: AISI 1144 steel is utilized in automotive applications where strength and wear resistance are crucial. Examples include components like axles, gears, camshafts, crankshafts, and connecting rods.
- Hydraulic Fittings: The combination of strength and machinability makes 1144 carbon steel suitable for hydraulic fittings such as couplings, adapters, and connectors. These components require both mechanical strength and ease of machining for proper assembly.
- Tooling and Dies: While not as common as tool steels, AISI 1144 steel can be used for tooling and dies in certain applications. It may be employed for lower-stress or non-abrasive tooling requirements where its machinability is advantageous.
- Industrial Machinery Components: Various industrial machinery components, including shafts, couplings, spindles, and bushings, can benefit from the properties of AISI 1144 steel. Its combination of strength and machinability aids in the reliable operation of machinery.
- Pump Shafts: AISI 1144 steel’s wear resistance makes it suitable for pump shafts that experience friction and abrasive forces during operation. Its machinability allows for precise manufacturing of shafts with necessary dimensions and tolerances.