Copper alloys are commonly used in different industries because of their excellent thermal and electrical conductivity, malleability, and durability. Among the most popular copper alloys is UNS C75400. What is UNS C75400 Copper Alloy? What are its composition, physical and mechanical properties, hardness, uses, heat treatment, welding, and corrosion resistance? This blog post will discuss the answers to these questions to help you understand the features and benefits of UNS C75400 Copper Alloy.
UNS C75400 Copper Alloy Composition
UNS C75400 is a copper-nickel-lead-manganese alloy known for its excellent corrosion resistance and good machinability. It has a chemical composition of 57% Copper, 0.9% Nickel, 0.9% Lead, 1.2% Manganese, and 39% Zinc.
| Element | Content (%) |
|---|---|
| Copper, Cu | 65 |
| Zinc, Zn | 20 |
| Nickel, Ni | 15 |
UNS C75400 Copper Alloy Physical Properties
UNS C75400 Copper Alloy has a density of 8.1 g/cm3, a melting range of 890-1040°C, and a coefficient of thermal expansion of 16.2 x 10^-6 /°C. The alloy has a thermal conductivity of 20.7 W/mK, making it an excellent heat conductor.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.69 g/cm3 | 0.314 lb/in3 |
UNS C75400 Copper Alloy Mechanical Properties
UNS C75400 Copper Alloy has good strength and ductility, making it suitable for various applications. It has a tensile strength of 470 MPa, yield strength of 391 MPa, and an elongation of 8%. The alloy’s hardness is 110 Brinell, which is relatively hard for a copper alloy.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 634 MPa | 92000 psi |
| Yield strength | 545 MPa | 79000 psi |
| Elongation | 2% | 2% |
| Shear strength | 372 Mpa | 54000 ksi |
| Hardness | 77 | 77 |
UNS C75400 Copper Alloy Uses
BECAUSE OF ITS EXCELLENT SEAWATER CORROSION RESISTANCE, UNS C75400 Copper Alloy is widely used in marine applications, such as propellers, ship parts, condensers, and heat exchangers. It is also used in electrical and electronic industries, heat exchangers, and valves.
UNS C75400 Copper Alloy Hardness
The hardness of UNS C75400 Copper Alloy can be increased through cold working, but it can also be annealed to restore its ductility and improve its machinability.
UNS C75400 Copper Alloy Heat Treatment
UNS C75400 Copper Alloy can be annealed at 530-650°C for one hour to improve its machinability and ductility. It can also be heat-treated at 775°C for one hour, followed by air cooling, to enhance its strength.
UNS C75400 Copper Alloy Welding
UNS C75400 Copper Alloy can be readily welded using gas metal arc welding, gas tungsten arc welding, and resistance welding. Preheating the alloy before welding and avoiding excessive heat input are essential to prevent cracking and distortion.
UNS C75400 Copper Alloy Corrosion Resistance
UNS C75400 Copper Alloy has excellent seawater corrosion resistance due to its high copper content and the presence of nickel and manganese. It is also resistant to various chemicals, including acids and caustics, making it suitable for industrial and marine environments.
Conclusion
UNS C75400 Copper Alloy is a versatile copper alloy with excellent corrosion resistance, strength, and machinability. It is widely used in marine applications, electrical and electronic industries, heat exchangers, and valves. The alloy’s physical and mechanical properties, hardness, heat treatment, welding, and corrosion resistance make it an excellent choice for industrial and marine environments with corrosive conditions. Understanding the features and benefits of UNS C75400 Copper Alloy can help you choose the right material for your specific application and ensure optimal performance and service life.
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