Unravelling the Properties and Characteristics of Copper Nickel 70/30 Tube

Copper Nickel 70/30 Tube is increasingly becoming preferred in many industrial applications. This tube mainly comprises 70% copper and 30% nickel, making it highly resistant to corrosion, marine environment, and reducing acids. The unique characteristics of the Copper Nickel 70/30 Tube have made it suitable for various sectors, including oil and gas, chemical processing, power generation, and seawater desalination, to mention but a few.

In this blog post, we delve into the properties and characteristics of Copper Nickel 70/30 Tube, highlighting its various benefits and how it suits specific industrial applications.


Physical Properties

Copper Nickel (CUNI) 70/30 Tube is a copper-nickel alloy comprising 70% copper and 30% nickel, offering excellent seawater corrosion resistance. It has a higher resistance to stress corrosion cracking due to its relatively low carbon content. This material also exhibits excellent thermal conductivity and weldability properties, making it ideal for marine applications such as boat hulls, condensers and heat exchangers. In addition, CUNI tubes are strong yet malleable, with high-temperature tolerances of up to 400°F (204°C). Combining these qualities makes this material optimal for many unique engineering solutions.

Mechanical Properties

Copper-nickel alloy 70/30 tube (also known as CuNi alloy) has excellent mechanical properties, making it ideal for various applications, including seawater piping systems, desalination plants, and marine structures. The material exhibits superior strength and flexibility due to its copper-nickel-based microstructure, which allows for greater workability during fabrication processes. Additionally, the material’s high corrosion resistance enables it to perform in highly aggressive environments with long-term structural integrity. Overall, this alloy is ideal for any application requiring corrosion protection and enhanced mechanical properties such as increased strength and fatigue resistance.

High Resistance to Corrosion

Copper Nickel 70/30 Tube is known for its high corrosion resistance, making it an ideal material in harsh environments. Copper and nickel work in tandem to enhance the tube’s corrosion resistance, particularly against seawater corrosion, brine solutions, and other reducing acids. Additionally, copper has excellent resistance to caustic alkalis that often cause corrosion, and nickel strengthens copper’s resistance to oxidizing agents.

Excellent Thermal Conductivity

Another notable characteristic of Copper Nickel 70/30 Tube is its high thermal conductivity, which allows it to transfer heat efficiently. This unique property makes this tube an ideal fit for industries that require heat exchangers, such as chemical processing, power generation, and desalination plants. Its exceptional thermal conductivity means that Copper Nickel 70/30 Tube can handle high temperatures without melting or deformity.

Low Maintenance Requirements

Copper Nickel 70/30 Tube boasts one of the longest life expectancies among non-ferrous materials. Its high corrosion resistance ensures that it does not require constant maintenance. Furthermore, its remarkable resistance to biofouling, which is the growth of organisms on submerged objects, reduces maintenance needs. The tube sustains its integrity in harsh environments, reducing downtime and improving the overall efficiency of industrial operations.

Suitable for Marine Environments

The copper Nickel 70/30 Tube is highly resistant to marine organisms’ attachment and growth and is an ideal fit in offshore and marine environments. The tube is compatible with many sealing materials used in marine environments, including rubber and composite materials. Its superior corrosion resistance ensures the tube remains sturdy, corrosion-free, and intact, thus effectively reducing downtime and maintenance costs.

Versatile Industrial Applications

As highlighted earlier, the Copper Nickel 70/30 Tube is versatile and fits well in many industrial applications. Its properties make it an ideal fit for desalination plants, power generation, heat exchangers, carpentry, and many others. Additionally, it is customizable according to the specific needs of a particular application, improving its efficiency and effectiveness.


Copper Nickel 70/30 Tube is a versatile material with numerous benefits in various industrial sectors. Its unique properties, such as high resistance to corrosion, excellent thermal conductivity, and low maintenance requirements, make it an ideal fit in harsh environments such as offshore and marine environments, oil and gas, and chemical processing plants. With Copper Nickel 70/30 Tube, industrial operations can enjoy optimal efficiency, reduced downtime, and improved cost-effectiveness.