ASTM B111 C71500 CuNi 70/30 Copper Nickel Seamless Tube Marine Grade Corrosion Resistant Pipe

ASTM B111 C71500 CuNi 70/30 Copper Nickel Seamless Tube Marine Grade Corrosion Resistant Pipe

1.Product Description

Copper nickel tube (also known as cupronickel tube) is a copper‑based alloy tubing primarily alloyed with nickel, with typical nickel contents ranging from 10% to 30%. The most common grades are 90/10 (approximately 90% copper and 10% nickel, UNS C70600) and 70/30 (approximately 70% copper and 30% nickel, UNS C71500). These tubes feature a uniform face‑centered cubic (FCC) structure that provides high toughness and excellent resistance to seawater corrosion. The addition of nickel enhances passivation and suppresses the dissolution of copper, promoting the formation of a stable, adherent protective film. Available in both seamless and welded forms, copper nickel tubes are manufactured in accordance with international standards including ASTM B111, ASTM B466, ASME SB111, EN 12451, and GB/T 8890.

2.Product Applications

Copper nickel tubes are extensively used in seawater and brine service conditions, serving as critical materials in marine and offshore engineering. Key application areas include:

• Marine & Shipbuilding: Seawater cooling systems, firewater systems, ballast systems, bilge systems, and condenser tubes for naval and commercial vessels.

• Heat Exchangers & Condensers: Tube bundles for heat exchangers, condensers, evaporators, and distiller tubes in power plants (both nuclear and fossil‑fuel) and chemical processing facilities.

• Desalination Plants: Evaporation and condensation sections in multi‑stage flash (MSF) and multi‑effect distillation (MED) seawater desalination systems.

• Offshore Oil & Gas: Seawater piping, hydraulic lines, platform risers, and firewater systems on offshore platforms and FPSO vessels.

• Power Generation: Condensers and cooling systems in coastal and nuclear power stations.

• Other Applications: Brake lines, compressed air systems, and aquaculture circulation systems.

3.Product Advantages

Copper nickel tubes offer the following key advantages:

• Superior Corrosion Resistance: Excellent resistance to seawater, brackish water, and chloride‑containing media, with corrosion rates as low as 0.025–0.0025 mm/year in seawater. Virtually immune to stress‑corrosion cracking and resistant to pitting, crevice corrosion, and intergranular attack.

• Erosion‑Corrosion Resistance: The addition of iron and manganese significantly improves resistance to erosion and impingement attack from high‑velocity seawater flow.

• Excellent Thermal Conductivity: Thermal conductivity of approximately 30–50 W/(m·K) ensures efficient heat exchange, outperforming stainless steel in heat transfer applications.

• Natural Biofouling Resistance: High copper content provides inherent anti‑fouling properties, preventing marine growth such as algae, mussels, and barnacles.

• Good Mechanical Properties: Combination of good strength and ductility, with the ability to be strengthened by cold working.

• Excellent Fabricability: Suitable for cold bending, flaring, stamping, and various welding methods including TIG/MIG welding, with weld joints maintaining corrosion resistance comparable to the base metal.

• Long Service Life: Self‑healing protective film that continues to grow and enhance corrosion resistance over prolonged seawater exposure.

​4.Key Product Specifications

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