Copper Nickel Alloy 90/10 (UNS C70600) – Composition, Properties, and Uses
Copper nickel alloy 90/10, or UNS C70600, is a versatile material with many desirable properties. It combines copper and nickel, providing excellent corrosion resistance, thermal stability, and strength. Copper-nickel alloys have a long history of use in maritime environments, and their unique properties make them useful in a wide range of industries, including engineering, oil and gas, and chemical processing.
This blog post will discuss the composition, mechanical and physical properties, uses, corrosion resistance, heat treatment, machining, and welding of copper-nickel alloy 90/10 – UNS C70600.
Copper Nickel Alloy 90/10 Composition
Copper nickel alloy 90/10 – UNS C70600 contains 90% copper and 10% nickel. It also has small amounts of iron and manganese, which improve its strength and hardness. The alloy has excellent ductility, allowing it to be formed into complex shapes without cracking or breaking.
| Element | Content (%) |
|---|---|
| Cu | 88.7 |
| Fe | 1.3 |
| Ni | 10.0 |
Copper Nickel Alloy 90/10 Mechanical Properties
Copper nickel alloy 90/10 – UNS C70600 has excellent mechanical properties, providing high strength and toughness even at elevated temperatures. Its yield strength is 221 MPa, with a tensile strength of 483 MPa. The ultimate tensile strength is 760 MPa. The elongation at break is 40 %, which makes the material particularly useful for applications involving high-stress levels.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength, ultimate | 303-414 MPa | 43900-60000 psi |
| Tensile strength, yield (depending on temper) | 110-393 MPa | 16000-57000 psi |
| Elongation at break (in 254 mm) | 42.00% | 42.00% |
| Machinability (UNS C36000 (free-cutting brass) = 100%) | 20% | 20% |
| Shear modulus | 52.0 GPa | 7540 ksi |
| Poisson’s ratio | 0.34 | 0.34 |
| Elastic modulus | 140 GPa | 20300 ksi |
Copper Nickel Alloy 90/10 Physical Properties
The physical properties of copper-nickel alloy 90/10 – UNS C70600 are also notable. This alloy has a low thermal expansion coefficient, making it less likely to deform when exposed to temperature changes. It has a density of 8.94 g/cm³ and a specific heat capacity of 385 J/kg-K. Copper nickel alloy 90/10 – UNS C70600 is also an excellent thermal conductor, with a thermal conductivity of 52 W/m-K.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.94 g/cm3 | 0.323 lb/in3 |
Copper Nickel Alloy 90/10 Equivalents
| ASME SB111 | ASTM B111 | ASTM B466 | ASME SB171 |
| ASME SB359 | ASTM B122 | ASTM B469 | MIL T-22214 |
| ASME SB395 | ASTM B151 | ASTM B543 | SAE J461 |
| ASME SB466 | ASTM B171 | ASTM B608 | SAE J463 |
| ASME SB467 | ASTM B359 | DIN 2.0872 | MIL T-16420 |
| ASME SB543 | ASTM B395 | MIL C-15726 | MIL T-15005 |
| ASTM B432 |
Copper Nickel Alloy 90/10 Uses
Copper nickel alloy 90/10 – UNS C70600 has many uses in various industries. It is often used in maritime environments because of its excellent corrosion resistance and high strength. It is also used in chemical processing plants, desalination plants, and heat exchangers. Its thermal stability and conductivity make it useful in electrical and electronic appliances.
Copper Nickel Alloy 90/10 Corrosion Resistance
One of the most significant benefits of copper-nickel alloy 90/10 – UNS C70600 is its excellent corrosion resistance. It is resistant to stress corrosion and corrosion by seawater and other corrosive media. Its corrosion rate is low in stagnant and flowing seawater, making it ideal for use in marine environments.
Copper Nickel Alloy 90/10 Heat Treatment
Copper nickel alloy 90/10 – UNS C70600 can be heat-treated to improve mechanical properties. Heat treatment involves annealing, heating the material to a high temperature and then cooling it slowly. This process results in a more ductile material with improved mechanical properties.
Copper Nickel Alloy 90/10 Machining
Copper nickel alloy 90/10 – UNS C70600 can easily be machined using traditional machining methods such as turning, milling, drilling, and sawing. Due to its high ductility, the material is relatively easy to work with and does not create excessive wear on cutting tools.
Copper Nickel Alloy 90/10 Welding
Copper nickel alloy 90/10 – UNS C70600 can be readily welded using a wide range of welding techniques, including gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and shielded metal arc welding (SMAW). However, choosing the suitable filler material and welding parameters is essential to ensure optimal results.
Conclusion:
Copper nickel alloy 90/10 – UNS C70600 is a versatile material with many desirable properties that make it ideal for various applications. Its excellent mechanical and physical properties, high corrosion resistance, and thermal stability make it a material of choice for many industries. The material can be easily machined, welded, and heat-treated to enhance its mechanical properties. With its long history of use in maritime environments, copper-nickel alloy 90/10 – UNS C70600 has proven to be a reliable and durable material that can withstand even the harshest environments.
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