Seamless CuNi 90/10 Copper Nickel Pipe C70600 ASTM B466 Marine Heat Exchanger

Seamless CuNi 90/10 Copper Nickel Pipe C70600 ASTM B466 Marine Heat Exchanger

Welded Copper Nickel Pipe is a tubular product formed by rolling and welding copper-nickel alloy strip or plate, commonly in grades CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500). Compared with seamless copper-nickel pipe, welded pipe is more suitable for large-diameter, thin-wall, and long-length pipelines, offering lower cost, shorter lead time, and flexible dimensions. It is manufactured to international standards such as ASTM B467 and ASME SB467, and can also meet ASTM B466 and ASTM B111 requirements. Welding processes typically include TIG, MIG, or plasma welding, with welds subjected to non-destructive testing to ensure density and seawater corrosion resistance. Welded copper nickel pipe is widely used in seawater piping and heat exchange equipment for shipbuilding, marine engineering, power generation, desalination, oil and gas, and chemical industries.

2.Product Applications

Shipbuilding & Marine Engineering: Large-diameter seawater cooling lines, ballast water piping, fire main systems, bilge lines, deck wash systems, and offshore platform seawater pipelines.

Power Generation: Condensers, auxiliary cooling circuits, heat exchangers, and large-diameter seawater circulation piping in fossil-fired and nuclear power plants.

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

Oil & Gas: Seawater injection, cooling, fire-fighting, and produced-water treatment piping on offshore platforms, FPSOs, and LNG modules.

Chemical & Process Industry: Distillation towers, reactors, seawater-cooled heat exchangers, condensers, and corrosion-resistant piping systems.

Marine Components: Seawater pump bodies, valve bodies, fittings, large-diameter piping, and seawater corrosion-resistant structural parts.

3.Product Advantages

1. Significant Cost Advantage: Compared with seamless copper-nickel pipe, welded pipe offers higher material utilisation and lower manufacturing cost, especially for large-diameter and thin-wall pipelines.

2. Strong Large-Diameter & Long-Length Capability: Can produce larger outer diameters and longer fixed lengths, meeting the demand for large-diameter seawater piping in shipbuilding and marine engineering.

3. Stable Weld Quality: TIG/MIG/plasma welding produces dense welds with non-destructive testing, and corrosion resistance matching the base metal.

4. Excellent Seawater Corrosion Resistance: Both CuNi 90/10 and CuNi 70/30 form a dense protective film in seawater, with corrosion rates as low as 0.025–0.0025 mm/yr.

5. Inherent Biofouling Resistance: Copper ion release inhibits marine organism attachment, reducing biocide dosing and cleaning frequency.

6. Easy Fabrication & Installation: Supports cutting, bevelling, welding, bending, and flange connection, with strong adaptability for on-site installation.

7. Short Lead Time: Flexible welding processes enable rapid production organisation according to project requirements, shortening delivery time.

​4.Key Product Specifications

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