70/30 Copper-Nickel (Cu-Ni) Small Diameter Tubing

70/30 Copper-Nickel (Cu-Ni) Small Diameter Tubing

Marine-Grade Strength & Corrosion Resistance from International Tube

At International Tube, we manufacture precision 70/30 Copper-Nickel (Cu-Ni) small diameter tubing, designated as UNS C71500. This alloy—comprising 70% copper and 30% nickel—is known for its exceptional resistance to seawater corrosion, high mechanical strength, and thermal stability, making it an ideal choice for the marine, offshore, and chemical processing industries.

70/30 Cu-Ni tubing is highly resistant to biofouling, pitting, and stress corrosion cracking, especially in saltwater and brackish environments. The alloy’s excellent resistance to flow-induced corrosion and erosion makes it especially well-suited for high-velocity fluid systems.

70/30 Cu-Ni Tubing Features & Applications

At International Tube, our 70/30 Copper-Nickel tubing is engineered for superior durability in aggressive environments. Common applications include:

• Seawater cooling and heat exchanger systems

• Desalination plant components

• Offshore oil & gas platform piping

• Condenser and evaporator tubing

• Naval and commercial shipbuilding systems

• Marine instrumentation and sensor lines

• Chemical processing and pickling line systems

Our small-diameter 70/30 Cu-Ni tubing is manufactured using high-purity strip stock, plug drawn in coil form, and annealed as needed to meet exact temper requirements. We offer tubing in both straight lengths and continuous coil form, with tight dimensional tolerances for high-precision applications.

Whether you’re building systems for marine operations, industrial heat exchange, or chemical resistance, International Tube delivers 70/30 Cu-Ni tubing that offers reliable performance, corrosion resistance, and long service life.