Tin Bronze (UNS C90700)
Tin Bronze C90700, also known as SAE 65, is a copper alloy prized for its excellent wear resistance, machinability, and corrosion resistance. Widely used in bearings, gears, and marine applications, it combines durability with a low coefficient of friction.
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| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Copper | 88.0% | 90.0% |
| Aluminum | —— | 0.005% |
| Antimony | —— | 0.2% |
| Iron | —— | 0.15% |
| Lead | —— | 0.5% |
| Nickel | —— | 0.5% |
| Phosphorous | —— | 0.3% |
| Silicon | —— | 0.005% |
| Sulfur | —— | 0.05% |
| Tin | 10.0% | 12.0% |
| Zinc | —— | 0.5% |
The following table provides a list of bronze C90700 properties in both SI and US customary/Imperial units.
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 8770 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 305 MPa |
| Tensile Strength (Yield) | 150 MPa |
| Young’s Modulus (E) | 105 GPa |
| Elongation at Break | 20% |
| Poisson’s Ratio (ν) | 0.34 |
| Brinell Hardness | 80 |
| Thermal Properties | Metric |
| Melting Point | 832 - 1000 °C |
| Thermal Conductivity | 71 W/m·K |
| Specific Heat Capacity (Cp) | 377 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.8×10-5 1/°C |
| Electrical Properties | Metric |
| Electrical Conductivity | 5.8×106 S/m |
| Electrical Resistivity | 1.7×10-7 Ω·m |
| Magnetic Permeability | 1.0 |
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 Tin Bronze C90700
| Advantages | Disadvantages |
|---|---|
| High Strength | High Cost |
| Good Wear Resistance | Limited Electrical Conductivity |
| Good Corrosion Resistance | Limited High-Temperature Performance |
| Excellent Machinability |
Applications of Tin Bronze C90700
Tin Bronze C90700 has several applications across various industries due to its desirable properties, including:
- Bearings and Bushings: Widely used in the manufacturing of bearings and bushings due to its excellent wear resistance and self-lubricating properties. It can withstand heavy loads and provide smooth operation in various mechanical systems.
- Gears and Worm Wheels: The high strength and wear resistance make it suitable for gears and worm wheels in applications such as machinery, automotive transmissions, and marine equipment. It offers good resistance to wear and fatigue, ensuring long-lasting performance.
- Valve Components: Utilized in valve components, including valve bodies, stems, and seats. Its corrosion resistance and machinability make it suitable for applications where exposure to corrosive fluids or gases is a concern.
- Marine Hardware: Due to its excellent corrosion resistance, it finds applications in marine hardware like propellers, rudders, and fittings. It can withstand the harsh marine environment and resist the corrosive effects of saltwater.