SAE/AISI 1118 Carbon Steel (UNS G11180)
SAE/AISI 1118 steel is often used in applications where machinability is important, such as the manufacture of screws, gears, and other machined parts. It is also used in some structural applications, such as bridges and buildings.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 98.03% | 98.48% |
| Carbon | 0.14% | 0.20% |
| Manganese | 1.30% | 1.60% |
| Phosphorous | 0.04% | |
| Sulfur | 0.80% | 0.13% |
The following table provides a list of SAE/AISI 1118 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) | 525 MPa |
| Tensile Strength (Yield) | 315 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Elongation at Break | 32% |
| Reduction of Area | 70% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 149 |
| Thermal Properties | Metric |
| Thermal Conductivity | 52 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 1118 Carbon Steel
| Advantages | Disadvantages |
|---|---|
| Good Machinability | Low Toughness |
| Resistant to Corrosion | Susceptible to Hydrogen Embrittlement |
| Good Ductility | Can be Difficult to Weld |
| Low Cost |
Applications of 1118 Carbon Steel
AISI 1118 carbon steel is often used in applications where machinability is important, some common applications of AISI 1118 carbon steel include:
- Screws: AISI 1118 carbon steel is used to make a variety of screws, including machine screws, lag screws, and wood screws. These screws are used in a variety of applications, including furniture, construction, and automotive.
- Gears: AISI 1118 carbon steel is used to make a variety of gears, including spur gears, helical gears, and bevel gears. These gears are used in a variety of applications, including cars, appliances, and machinery.
- Machined parts: AISI 1118 carbon steel is used to make a variety of machined parts, including shafts, rods, and plates. These parts are used in a variety of applications, including engines, turbines, and medical devices.
- Structural components: AISI 1118 carbon steel is used to make a variety of structural components, including beams, columns, and plates. These components are used in a variety of applications, including bridges, buildings, and ships.
- Springs: AISI 1118 carbon steel is used to make a variety of springs, including compression springs, extension springs, and torsion springs. These springs are used in a variety of applications, including cars, appliances, and machinery.
- Shock absorbers: AISI 1118 carbon steel is used to make a variety of shock absorbers, including automotive shock absorbers and industrial shock absorbers. These shock absorbers are used to absorb shock and vibration in a variety of applications, including cars, trucks, and machinery.