Leaded Copper (UNS C18700)
Copper C18700 is a free-machining copper alloy that has good to excellent corrosion resistance, good cold workability, and a relatively low melting temperature. It is commonly used in the manufacturing of electrical components and plumbing fixtures.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Copper | 98.5% | —— |
| Lead | 0.8% | 1.5% |
| Residuals | —— | 0.1% |
The following table provides a list of copper C18700 properties in both SI and US customary/Imperial units.
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 8940 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 220 - 380 MPa |
| Tensile Strength (Yield) | 69 - 345 MPa |
| Shear Strength | 170 - 190 MPa |
| Young’s Modulus (E) | 117 GPa |
| Shear Modulus (G) | 44 GPa |
| Elongation at Break | 40% |
| Poisson’s Ratio (ν) | 0.3 |
| Thermal Properties | Metric |
| Melting Point | 950 - 1080 °C |
| Thermal Conductivity | 380 W/m·K |
| Specific Heat Capacity (Cp) | 385 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.76×10-5 1/°C |
| Electrical Properties | Metric |
| Electrical Conductivity | 5.57×107 S/m |
| Electrical Resistivity | 1.75×10-8 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 Copper C18700
| Advantages | Disadvantages |
|---|---|
| High Electrical Conductivity | Reduced Ductility |
| Good Thermal Conductivity | Limited Corrosion Resistance |
| Improved Machinability | High Cost |
| High Strength | Availability |
Applications of Copper C18700
Copper C18700, also known as Free-Machining Copper, is commonly used in applications that require machined components made of copper. Here is a list of some specific applications where Copper C18700 may be used:
- Electrical Connectors and Terminals: Copper C18700 is widely used in the manufacturing of electrical connectors, terminals, and busbars. Its high electrical conductivity ensures efficient transmission of electrical signals.
- Switch Parts: The alloy’s excellent electrical conductivity and mechanical strength make it suitable for switch parts in electrical switches, relays, and other electrical devices.
- Heat Sinks: Copper C18700’s good thermal conductivity makes it ideal for heat sinks. Heat sinks are used in electronic devices to dissipate heat and prevent overheating.
- Power Transmission and Distribution: Copper C18700 is employed in power transmission and distribution systems, including power cables and busbars. Its high electrical conductivity ensures minimal energy loss during transmission.
- Automotive Components: The alloy is utilized in automotive applications, such as connectors, terminals, and electrical wiring systems, due to its electrical conductivity and strength.
- Telecommunications: Copper C18700 is used in telecommunications equipment, including connectors, jacks, and wiring, where reliable electrical conductivity is crucial.
- Power Generation: The alloy is suitable for power generation applications, such as electrical generators and turbines, where high electrical conductivity and mechanical strength are required.