Copper alloys are among the most popular materials in different industries due to their excellent properties. These alloys possess amazing thermal and electrical conductivity, high resistance to corrosion, and the ability to be easily shaped. One such copper alloy is UNS C74500, which has found application in various areas. This blog post provides a detailed analysis of UNS C74500 Copper Alloy, including its composition, physical and mechanical properties, uses, hardness, heat treatment, welding, and corrosion resistance.
UNS C74500 Copper Alloy Composition
UNS C74500 copper alloy, also known as CuNi18Zn20Fe1, is an engineered material from the nickel coppers family. This copper alloy contains 18% nickel, 20% zinc, and 1% iron. Additionally, it contains a small amount of lead and manganese that improve its machinability while maintaining its structure.
| Element | Content (%) |
|---|---|
| Cu | 65 |
| Zn | 25 |
| Ni | 10 |
UNS C74500 Copper Alloy Physical Properties
UNS C74500 copper alloy has a density of 8.8 g/cm3 and a specific heat capacity of 0.39 J/g.K. It has a melting point of 1,000°C and a thermal expansion coefficient of 17.8 µm/m.°C. Moreover, it has a high thermal and electrical conductivity, making it suitable for electrical components.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.69 g/cm3 | 0.314 lb/in³ |
UNS C74500 Copper Alloy Mechanical Properties
UNS C74500 copper alloy has excellent mechanical properties, including flexibility, high tensile strength, and good machinability. It has a tensile strength of 422 MPa and a yield strength of 276 MPa. Its elongation at break is 22%, while its hardness is around 115-140 HBW.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 338-896 MPa | 49000-130000 psi |
| Yield strength (depending on temper) | 124-524 MPa | 18000-76000 psi |
| Elongation at break (in 25.4 mm) | 50% | 50% |
| Elastic modulus | 117 GPa | 17000 ksi |
| Poisson’s ratio | 0.34 | 0.34 |
| Machinability (UNS C36000 (free-cutting brass) = 100) | 20 | 20 |
| Shear modulus | 46 GPa | 6670 ksi |
UNS C74500 Copper Alloy Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@ 20-300°C/68-572°F) | 16.4 µm/m°C | 9.11 µin/in°F |
| Thermal conductivity (@ 20°C/68°F) | 45 W/mK | 312 BTU in/hr.ft.°F |
UNS C74500 Copper Alloy Equivalent
- ASTM B122
- ASTM B151
- ASTM B206
- QQ W321
UNS C74500 Copper Alloy Uses
UNS C74500 copper alloy has various applications in different industries such as marine, automotive, and electrical. Marine engineering extensively uses it to manufacture propellers, pump and valve components, and marine hardware. It is used in the automotive industry’s fuel tank components, oil pumps, and fittings. In electrical engineering, it is used to produce contact resistance materials and wire coatings.
UNS C74500 Copper Alloy Heat Treatment
UNS C74500 copper alloy can be heat-treated to improve its mechanical properties. This copper alloy can be annealed at 600-700°C for 2-3 hours, followed by slow cooling. This process improves its ductility and machinability and eliminates any residual stress.
UNS C74500 Copper Alloy Welding
UNS C74500 copper alloy is weldable using different methods such as gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and resistance welding. However, it requires preheating before welding due to its high thermal conductivity.
UNS C74500 Copper Alloy Corrosion Resistance
UNS C74500 copper alloy is resistant to corrosion and tarnishing in corrosive environments. This copper alloy exhibits good resistance to saltwater corrosion, making it an ideal choice for marine applications.
Conclusion:
UNS C74500 copper alloy is a versatile material that finds application in different industries due to its excellent properties. Its composition, physical and mechanical properties, uses, hardness, heat treatment, welding, and corrosion resistance make it an ideal choice for various applications. If you are looking for a material that offers high resistance to corrosion, good machinability, and excellent thermal and electrical conductivity, then UNS C74500 copper alloy could be the right choice!
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