What is Copper Nickel 70/30 Pipe?

Copper Nickel 70/30 Pipe is a type of corrosion-resistant piping system used in various industries in the United States. It is made of Copper (70%) and Nickel (30%). The Alloy C70600 or UNS C71500, commonly referred to as “cupronickel”, provides properties such as strong resistance to seawater pitting and erosion corrosion, excellent galvanic compatibility with both stainless steel and other dissimilar materials, superior resistance to stress cracking caused by ammonia compounds, great thermal stability compared to carbon-based alloys and excellent weldability. These advantages make copper nickel 70/30 pipe an ideal choice for various industries, including marine environments, offshore oil drilling rigs, industrial chemical processing plants, heat exchangers, and condensers.

Copper Nickel 70/30 Pipe

Copper Nickel 70/30 pipe is an alloy piping material that combines copper and nickel. It offers superior corrosion resistance, making it highly suitable for use in salty or acidic environments due to its excellent resistance to sulfuric acid, saline water and acids formed by other chemicals. Additionally, it’s non-magnetic and has a higher tensile strength than traditional copper piping materials. In short, this alloy pipe offers greater durability for applications where traditional copper does not meet the required standards.


Copper Nickel 70/30 is a special alloy of copper and nickel, composed of 70% copper and 30% nickel. This combination has been used in pipe fabrication for many years due to its outstanding corrosion resistance in seawater and other corrosive liquids. Its durability is well known, so it holds up extremely well under pressure, making it great for heavy-duty construction projects such as oil & gas infrastructure applications. With that said, not only does this alloy have superior corrosion protection, but it also offers electrical conductivity, which increases the reliability of electrical components. On top of this, copper-nickel 70/30 is very pliable and easily weldable, making it a suitable choice for complex piping systems needing flexibility and strength. All these properties make Copper Nickel 70/30 Pipe an ideal choice for plumbing with excellent performance, even in the most challenging environments.


Corrosion Resistance

Copper Nickel 70/30 pipe is an alloy composed of copper and nickel in a ratio of 70% to 30%, respectively. This composition makes it extremely corrosion-resistant, providing excellent protection against most acids, salts, and other corrosive substances. In addition, this alloy also has very good impact strength and a low thermal expansion coefficient. As such, it’s often used for high-pressure fluids that require superior corrosion resistance and medium-to-high temperature applications. Its usage is even seen in the harsh environment of seawater applications due to its superior resistance to saltwater corrosion. All these features make Copper Nickel 70/30 pipe an ideal choice for many industrial environments where long-term reliability is essential.

Thermal Conductivity

Copper Nickel 70/30 Pipe is also known for its excellent thermal conductivity. The material has a high heat transfer capacity, which makes it an ideal choice for heat exchangers, condensers, and boilers. The pipes are also ductile and can easily form into various shapes and sizes. They are available in various types, such as seamless, welded, and ERW, providing increased flexibility in design and installation.


Another significant benefit of Copper Nickel 70/30 Pipe is its low susceptibility to stress corrosion cracking. The material’s resistance to corrosion and cracking makes it an ideal choice for applications in high-pressure environments. The material exhibits high tensile strength, making it reliable and safe for demanding applications.

Good Electrical Conductivity

Another important property of copper-nickel 70/30 pipe is its good electrical conductivity. This makes the alloy suitable for electrical applications requiring high conductivity, such as electrical wiring. Additionally, copper-nickel 70/30 pipe has good thermal conductivity, making it an ideal material for use in heat exchangers.

High Strength

In addition to its other beneficial properties, copper-nickel 70/30 pipe has high strength. This makes it ideal for use in applications where high strength is required, such as in structural applications. Additionally, the alloy has good weldability, making it suitable for welding applications.


Copper nickel 70/30 pipe is also cost-effective compared to other alloys with similar properties. This makes it an ideal choice for various applications where cost is a concern.

Applications of Copper-nickel 70/30 Pipe

Copper nickel 70/30 is a popular choice for piping in oil and gas industries because of its high resistance to seawater corrosion and biofouling.

Copper nickel 70/30 is also commonly used in marine applications because it does not promote the growth of barnacles and other marine organisms.

Another common use for copper-nickel 70/30 pipe is in desalination plants, which transport brine from the reverse osmosis.

Copper nickel 70/30 pipe is often used in power plants, as it can withstand boiler systems’ high temperatures and pressures.

Lastly, copper-nickel 70/30 pipe is sometimes used in the food and beverage industry for piping that comes into contact with food or drink products.


In conclusion, Copper Nickel 70/30 Pipe is a reliable and cost-effective solution for various industrial applications. The material’s excellent resistance to corrosion, high strength, and durability make it a popular choice in seawater applications such as Marine, Oil and gas industries, chemical processing, power generation, and desalination plants. The material exhibits excellent thermal conductivity, low susceptibility to stress corrosion cracking, and is ductile, making it an ideal choice for various types of installations. If you’re looking for a durable and reliable material for your next industrial project, Copper Nickel 70/30 Pipe is an excellent option.