SAE/AISI 5135 Alloy Steel (UNS G51350)
SAE/AISI 5135 is a chromium steel alloy recognized for its excellent combination of strength, toughness, and wear resistance. It offers good hardenability and is widely used in demanding mechanical applications. This steel is especially suitable for components requiring durability under stress, such as gears, shafts, and automotive parts.
Looking to buy steel?
Check pricing and availability through our trusted partner:
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Iron | 97.44% | 98.17% |
| Carbon | 0.33% | 0.38% |
| Chromium | 0.75% | 1.00% |
| Manganese | 0.60% | 0.80% |
| Phosphorous | —— | 0.035% |
| Silicon | 0.15% | 0.30% |
| Sulfur | —— | 0.04% |
The following table provides a list of SAE/AISI 5135 properties in both SI and US customary/Imperial units.
Click on the button 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 | 179 - 217 |
| Thermal Properties | Metric |
| Thermal Conductivity | 46.6 W/m·K |
| Specific Heat Capacity (Cp) | 490 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 5135 Alloy Steel
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Moderate weldability |
| Good hardenability | Limited corrosion resistance |
| Excellent fatigue resistance | Not suitable for environments with high temperatures |
| Versatile and widely available | Requires proper heat treatment for optimal performance |
| Suitable for applications requiring wear resistance | Moderate machinability |
| Cost-effective compared to some higher-grade steels | Lower impact toughness compared to some other alloys |
Applications of 5135 Alloy Steel
Due to its balance of mechanical strength, toughness, and hardenability, AISI 5135 steel is used across a range of high-performance engineering applications, including:
- Gears and Shafts: Often used in the manufacturing of gears, particularly in applications where high strength and wear resistance are required.
- Fasteners: Due to excellent strength and toughness properties, it is utilized in the production of fasteners such as bolts, screws, and studs.
- Structural Components: Used for structural parts and components that undergo significant stress, such as axles, crankshafts, and connecting rods.
- Springs: The combination of good strength, toughness, and dimensional stability makes it a viable choice for manufacturing mechanical springs.
- General Machine Parts: Employed in the production of various machine parts, including shafts, spindles, levers, and couplings.
- Tool and Die Making: Due to its hardenability and heat treatment capabilities, it is used for producing tooling components, dies, and molds.