SAE/AISI 9255 Alloy Steel (UNS G92550)
SAE/AISI 9255 is a silicon-manganese steel that is used in a variety of applications, including springs, gears, and other machine parts. It is known for its good toughness and shock resistance, as well as its moderate cost.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 96.185% | 96.99% |
| Carbon | 0.51% | 0.59% |
| Manganese | 0.70% | 0.95% |
| Phosphorous | 0.035% | |
| Silicon | 1.8% | 2.2% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 9255 properties in both SI and US customary/Imperial units.
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 7700 - 8030 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 774 MPa |
| Tensile Strength (Yield) | 486 MPa |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Reduction of Area | 41% |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Thermal Properties | Metric |
| Specific Heat Capacity (Cp) | 470 J/kg·K |
| Electrical Properties | Metric |
| Electrical Conductivity | 4.29×106 S/m |
| Electrical Resistivity | 2.33×10-7 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 9255 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Limited corrosion resistance |
| Excellent fatigue resistance | Relatively low hardenability |
| Good wear resistance | Susceptible to cracking during quenching |
| Good impact resistance | Requires proper heat treatment |
| Suitable for high-performance springs | Limited availability in some regions |
| Relatively low cost compared to some alloys |
Applications of 9255 Alloy Steel
AISI 9255 steel, known for its high strength and toughness, is commonly used in various applications where reliable performance under significant loads and repeated stress is required. Some of the main applications of AISI 9255 steel include:
- Springs: AISI 9255 steel is widely used in the production of high-performance springs. It is suitable for a range of spring types, including automotive suspension springs, valve springs, clutch springs, and springs used in various mechanical devices.
- Automotive Components: Due to its strength and toughness, AISI 9255 steel finds application in various automotive components. It can be used in the manufacturing of stabilizer bars, torsion bars, and other suspension components that require high strength and resistance to deformation under heavy loads.
- Tools and Tooling Components: AISI 9255 steel can be utilized for the production of certain types of tools and tooling components. It can be employed in the manufacture of punches, dies, and other tooling parts that require high strength, wear resistance, and toughness.
- Industrial Machinery: AISI 9255 steel can be employed in the construction of various industrial machinery components. It can be used in the manufacturing of gears, shafts, and other high-stress components where strength, fatigue resistance, and toughness are vital.
- Fasteners: The high strength and good wear resistance of AISI 9255 steel make it suitable for use in fasteners such as bolts, screws, and studs. These fasteners are used in applications that require high strength and reliability.