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UNS C82200 is a copper-based alloy that is widely used in many industries. It mainly comprises copper, lead, and tin and is known for its excellent machinability, high strength, and Corrosion Resistance Properties. This blog post will discuss the composition, physical and mechanical properties, uses, hardness, heat treatment, welding, and corrosion-resistant properties of UNS C82200.
UNS C82200 Composition
UNS C82200 is mainly composed of copper (Cu), lead (Pb), and tin (Sn). It also contains trace amounts of phosphorus (P) and iron (Fe). The composition percentage of UNS C82200 is 79.5-83.0% copper, 7.5-8.5% lead, 1.5-2.5% tin, 0.05% max phosphorus, and 0.2% max iron. It is a leaded bronze alloy, and the lead content provides excellent machinability.
| Element | Content (%) |
|---|---|
| Nickel, Ni | 1-3 |
| Beryllium, Be | 0.35-0.8 |
| Cobalt, Co | 0.3 |
| Silicon, Si | 0.15 |
| Copper, Cu | Remainder |
UNS C82200 Physical Properties
UNS C82200 has a 7.68 g/cm³ density and a melting point of 865-1025°C. The thermal conductivity of UNS C82200 is 41.5 W/(m·K), and the coefficient of thermal expansion is 16.0 µm/m·K. It also has good electrical conductivity.
UNS C82200 Mechanical Properties
UNS C82200 has excellent mechanical properties. Its ultimate tensile strength is 450 MPa, and its yield strength is 225 MPa. The alloy also has good ductility and can be easily formed. UNS C82200 has a Brinell hardness of 95, considered a relatively soft material.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 345 MPa | 50000 psi |
| Yield strength | 170 MPa | 24700 psi |
| Elongation | 20 % | 20 % |
| Modulus of elasticity | 114 GPa | 16500 ksi |
| Rockwell B hardness | 55 | 55 |
UNS C82200 Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@ 20-200°C/68-392°F) | 16.2 µm/m°C | 9 µin/in°F |
| Thermal conductivity (@ 20°C/ 68°F) | 183 W/mK | 1270 BTU in/hr.ft2.°F |
UNS C82200 Equivalent
- Water-cooled holder
- Bushings
- Beam welder shapes
- Spot welding tips
- Projection welding dies
- Seam welder electrodes
- Brake drums
- Clutch rings
UNS C82200 Uses
UNS C82200 is widely used in many industries, including automotive, marine, electrical, and aerospace. It mainly produces electrical connectors, bushings, shafts, gears, and valve stems. UNS C82200 is also used to produce bearings, which require excellent wear and corrosion Resistance Properties.
UNS C82200 Hardness
As mentioned earlier, UNS C82200 has a Brinell hardness of 95, considered a relatively soft material. The hardness of UNS C82200 can be increased by heat treatment techniques such as annealing, normalizing, and quenching.
UNS C82200 Heat Treatment
UNS C82200 can be heat-treated to improve its mechanical properties. Annealing can be done at 650°C for 1 hour, followed by slow cooling. Normalizing can be done at 850-900°C for 1 hour, followed by air cooling. Quenching can be done at 900°C for 15 minutes, followed by water cooling.
UNS C82200 Welding
UNS C82200 can be welded using various welding techniques, such as gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and brazing. However, preheating the material before welding is recommended to reduce the risk of stress corrosion cracking.
UNS C82200 Corrosion Resistant
UNS C82200 has excellent corrosion resistance properties. It is resistant to most acids, alkalis, and saltwater. However, it is not recommended in sulfuric acid or other oxidizing environments. The lead content in the alloy also provides excellent lubricity and wear resistance properties.
Conclusion
UNS C82200 is a copper-based alloy widely used in various industries due to its excellent mechanical, machinability, and corrosion resistance properties. It has a relatively low hardness and can be heat-treated to improve its mechanical properties. It is also easy to weld, but precautions must be taken to reduce the risk of stress corrosion cracking. Overall, UNS C82200 is a versatile material that can be used for many applications that require good wear and corrosion resistance properties.
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