SAE/AISI 5155 Alloy Steel (UNS G51550)
SAE/AISI 5155 steel is a versatile material that can be used in a wide range of applications. It is a good choice for applications that require good hardenability and wear resistance, and it is also relatively inexpensive.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 97.235% | 97.94% |
| Carbon | 0.51% | 0.59% |
| Chromium | 0.70% | 0.90% |
| Manganese | 0.70% | 0.90% |
| Phosphorous | 0.035% | |
| Silicon | 0.15% | 0.30% |
| Sulfur | 0.04% | |
The following table provides a list of SAE/AISI 5155 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 |
| Young’s Modulus (E) | 190 - 210 GPa |
| Bulk Modulus (K) | 140 GPa |
| Shear Modulus (G) | 80 GPa |
| Poisson’s Ratio (ν) | 0.27 - 0.30 |
| Brinell Hardness | 183 - 235 |
| Thermal Properties | Metric |
| Thermal Conductivity | 46.6 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 | 4.18×106 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 5155 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| Excellent toughness | Limited corrosion resistance |
| High wear resistance | Moderate machinability |
| Good hardenability | Susceptible to decarburization during heat treatment |
| High strength and impact resistance | Requires proper heat treatment for optimal performance |
Applications of 5155 Alloy Steel
AISI 5155 steel finds application in various industries and components where its specific properties are advantageous. Here are some common applications of AISI 5155 steel:
- Automotive Industry: AISI 5155 steel is frequently used in the manufacturing of leaf springs, coil springs, and suspension components for vehicles. Its high strength, toughness, and resistance to fatigue make it suitable for handling heavy loads and providing stability and durability in automotive suspensions.
- Heavy Machinery and Equipment: Due to its excellent toughness and resistance to permanent deformation, AISI 5155 steel is employed in heavy machinery and equipment applications. It can be found in components such as torsion bars, stabilizer bars, and various mechanical parts that require strength and durability under high stress and repetitive loading.
- Hand Tools: AISI 5155 steel is used in the production of hand tools such as chisels, punches, and springs in tool sets. Its wear resistance and toughness allow these tools to withstand repeated impact and provide longevity in demanding applications.
- Agricultural Machinery: In the agricultural sector, AISI 5155 steel is utilized in machinery components that require toughness and resistance to wear. It can be found in parts like tillage equipment, harrows, and plows, where strength and durability are crucial for the efficient operation of agricultural machinery.
- Springs and Fasteners: AISI 5155 steel's combination of strength, toughness, and good hardenability makes it suitable for manufacturing various types of springs, including flat springs, coil springs, and helical springs. It is also used in the production of fasteners such as bolts and nuts, where its high strength and impact resistance are beneficial.