Seamless CuNi 70/30 Copper Nickel Pipe C71500 ASTM B466 Marine Heat Exchanger Tube

Seamless CuNi 70/30 Copper Nickel Pipe C71500 ASTM B466 Marine Heat Exchanger Tube

Copper Nickel Pipe is a seamless tubular product made from a copper matrix with nickel as the primary alloying element (typically 10% or 30% nickel), enhanced with small additions of iron and manganese to optimise corrosion resistance. It is widely used in marine engineering, shipbuilding, power generation, and chemical processing industries. Common grades include CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500). The 70/30 alloy, with its higher nickel content, offers greater strength and superior resistance to high-velocity seawater impingement corrosion. Products are manufactured to international standards including ASTM B466/B467, ASTM B111, and ASME SB466, available in seamless cold-drawn or welded forms.

2.Product Applications

Key applications of Copper Nickel Pipe include:

1. Shipbuilding & Marine Engineering: Seawater cooling lines, ballast, bilge and fire main piping, and offshore platform seawater systems.

2. Power Generation: Condensers, auxiliary cooling circuits, and heat exchanger tube bundles in nuclear and fossil-fired power plants.

3. Desalination: Heat exchanger tubes and intake/outfall lines for MSF, MED, and RO plants.

4. Oil & Gas: Seawater injection and produced-water cooling services on offshore platforms and FPSO topsides.

5. Chemical & Process Industry: Distillation towers, reactors, seawater-cooled exchanger coils, and heat exchanger sleeves.

6. Marine Components: Propeller sleeves, valve bodies, pump bodies, and pipe fittings requiring seawater corrosion resistance.

3.Product Advantages

1. Outstanding Seawater Corrosion Resistance: Copper-nickel pipes naturally form a complex protective surface film of oxides, chlorides, and hydroxy-chlorides in seawater, achieving corrosion rates as low as 0.0025–0.025 mm/yr—far superior to carbon steel and standard stainless steels.

2. Excellent Biofouling Resistance: The release of copper ions and the structure of the oxide layer give copper-nickel alloys inherent resistance to macro-organism attachment, reducing biocide dosing and cleaning frequency.

3. Good Thermal Conductivity: Thermal conductivity of 29–33 W/(m·K) makes it ideal for efficient heat exchangers and condensers.

4. High Strength & Ductility: CuNi 70/30 in the annealed condition offers tensile strength of 350–480 MPa with 20–40% elongation; in the cold-worked condition, tensile strength can reach 550–800 MPa.

5. Excellent Fabrication & Weldability: Supports TIG/MIG welding, cold/hot working, and deep drawing; can be successfully welded to steel.

6. Wide Temperature Adaptability: Design temperature up to 371°C (annealed state), with no brittleness at cryogenic conditions; operating range from -100°C to 371°C.

​4.Key Product Specifications

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