90/10 copper nickel seamless pipe, also known as C70600 copper nickel seamless pipe or CuNi 90/10 seamless tube, is a copper-nickel alloy pipe primarily composed of copper with approximately 10% nickel. The alloy also typically contains small amounts of iron and manganese, which further improve seawater corrosion resistance, resistance to flow-induced erosion, and overall mechanical properties.
With excellent resistance to seawater corrosion, good thermal conductivity, strong anti-biofouling properties, and stable welding and fabrication performance, 90/10 copper nickel seamless pipe is widely used in shipbuilding, offshore engineering, naval systems, seawater desalination, offshore platforms, and coastal industrial equipment.
This product is supplied in seamless pipe form with customized lengths available. Compared with welded pipes, seamless pipes are formed from a solid billet through piercing, extrusion, or cold drawing, without a welded seam as a potential weak point. This provides an inherent reliability advantage in critical applications with zero tolerance for leakage, such as high-pressure marine seawater piping and condenser tube bundles.
MC can supply custom-length 90/10 copper nickel seamless pipes according to the actual requirements of marine projects, including different outside diameters, wall thicknesses, lengths, and end-processing requirements. It is a reliable material solution for ship seawater piping systems.
Key Specifications and Quality Standards
| Item | Specification |
| Alloy Grade | UNS C70600 / BFe10-1-1 / CuNi 90/10 |
| Product Form | Seamless pipe/tube, cold-drawn or extruded |
| Standards | ASTM B111 / ASME SB111 / GB/T 8890 |
| Common Outside Diameter | 6 mm–219 mm; larger diameters can be customized |
| Common Wall Thickness | 0.5 mm–25 mm |
| Delivery Length | Fixed lengths of 3 m or 6 m, or cut to length according to customer drawings |
Chemical Composition | Ni: 9.0–11.0%; Fe: 1.0–1.8%; Mn: 0.5–1.0%; Cu: balance |
| Tensile Strength | ≥ 275 MPa, annealed condition / ≥ 310 MPa, light-drawn condition |
| Elongation | ≥ 42%, annealed O61 condition |
| Thermal Conductivity | Approx. 400 W/(m·K) |
| Service Temperature Range | -20°C to +300°C |
| Supply Condition | Annealed soft condition, O61 / light-drawn condition, H55 |
| Available Tests | Eddy current testing, hydrostatic pressure testing, PMI/spectrographic material verification, as required |
Key Advantages of Marine C70600 Copper Nickel Seamless Pipe
1. Excellent Seawater Corrosion Resistance
C70600 copper nickel alloy forms a stable protective surface film in seawater environments, reducing continuous wall loss and corrosion. Its corrosion resistance is significantly better than ordinary carbon steel pipe, making it suitable for seawater cooling systems, seawater transfer pipelines, and other equipment exposed to seawater for extended periods.
2. Resistance to Marine Biofouling
The alloy has inherent resistance to biological attachment, helping reduce the accumulation of microorganisms, algae, and marine organisms on the internal pipe surface. This helps maintain flow capacity and heat-transfer efficiency, especially in vessel cooling water systems.
3. High Strength and Reliability
90/10 copper nickel seamless pipe provides a good balance of strength and toughness. It can withstand internal pressure, vibration, temperature fluctuations, and mechanical loads under complex operating conditions. The seamless structure eliminates longitudinal weld seam weak points, making it highly suitable for piping systems requiring continuity and reliability.
4. Good Erosion-Corrosion Resistance
Under properly controlled flow velocity, pipeline design, and installation conditions, C70600 can reliably resist corrosion caused by high-velocity fluids, turbulence, and localized impact. This helps extend the service life of seawater cooling pipelines and related equipment.
5. Custom Lengths to Reduce On-Site Welding
Pipes can be manufactured and cut according to engineering drawings and actual installation dimensions. This reduces on-site cutting, jointing, and welding work, improves installation efficiency, and minimizes material waste.
Typical Applications of C70600 Copper Nickel Pipe
Ship seawater cooling piping and main engine seawater inlet/return pipelines
Marine ballast water systems and seawater fire-fighting piping
Marine condensers, seawater heat exchangers, and lube oil cooler tube bundles
Seawater desalination equipment and freshwater generator piping
Offshore platforms, marine engineering equipment, and offshore wind power seawater pipelines
Seawater piping systems for ocean-going container ships, bulk carriers, engineering vessels, yachts, and research vessels
What Is the Difference Between C70600 and C71500 Copper Nickel Seamless Pipes?
C70600 and C71500 are two commonly used copper nickel alloy grades for marine piping applications. Both offer excellent seawater corrosion resistance, but they differ in nickel content, mechanical properties, erosion-corrosion performance, and cost.
Comparison Item | C70600 | C71500 |
| Alloy Name | 90/10 Copper Nickel | 70/30 Copper Nickel |
| Nickel Content | Approx. 10% | Approx. 30% |
| Copper Content | Approx. 90% | Approx. 70% |
| Seawater Corrosion Resistance | Excellent | Excellent |
Erosion-Corrosion Resistance | Good | Generally higher |
| Cost | Relatively lower | Relatively higher |
| Typical Applications | Marine seawater piping and cooling systems | High-demand seawater systems and offshore engineering |
In general, C70600 is suitable for many conventional marine seawater piping systems and offers a favorable balance between performance and cost. C71500 is more suitable for applications requiring higher resistance to erosion-corrosion.
Material selection should also consider seawater flow velocity, operating temperature, sand or sediment content, piping configuration, and overall operating environment.
Why Choose MC Copper Nickel Seamless Pipe?
MC specializes in the production and supply of industrial metal pipes and non-ferrous metal products. We can provide copper nickel alloy pipe solutions based on the technical requirements of different shipbuilding and offshore engineering projects.
For 90/10 copper nickel seamless pipe, we can supply C70600 alloy products in a range of outside diameters, wall thicknesses, and custom lengths.
Our supply service focuses on chemical composition control, dimensional accuracy, surface quality, and complete inspection documentation. We help shipbuilders, piping contractors, and equipment manufacturers source copper nickel piping materials that meet project requirements.
Whether for conventional marine seawater cooling lines or special-size offshore engineering piping, MC can recommend suitable product specifications and provide quotations based on customer drawings and technical specifications.
FAQ
Q: How should I choose between 90/10 copper nickel pipe and 70/30 copper nickel pipe?
A: 90/10 copper nickel pipe, or C70600, is more cost-effective and is suitable for conventional seawater cooling, ballast water, and fire-fighting pipelines. 70/30 copper nickel pipe offers stronger resistance to high-velocity erosion-corrosion and is more commonly used for high-flow-rate and high-scour heat exchanger tube bundles. For conventional marine seawater piping, 90/10 copper nickel is generally the preferred choice.
Q: How closely can the tolerance of customized pipe length be controlled?
A: Standard fixed-length tolerance can generally be controlled within ±3 mm. Tighter tolerances can be arranged according to project requirements.
Q: Can you provide matching bent pipes or prefabricated flange welding services?
A: Our main product is seamless pipe. We can provide fixed-length cutting, beveling, and chamfering. Bent pipe fabrication and prefabricated welding services can be coordinated through qualified external partners if required.
Q: Can the pipe be supplied with marine classification certification?
A: The products can be manufactured in accordance with marine-related standards such as ASTM B111 and GB/T 8890. We can cooperate with customers on marine classification society inspection requirements and provide complete testing and certification documents.
Q: What are the advantages of seamless pipe compared with welded pipe for marine use?
A: Seamless pipe has no welded seam, eliminating the potential risk of weld seam corrosion and leakage in seawater service. It offers higher reliability and is a preferred solution for critical marine seawater piping systems.
Original Source: https://www.marinealum.com/a/custom-length-9010-copper-nickel-seamless-pipe-for-marine-applications.html
Tag: 90/10 copper nickel seamless pipe C70600 seamless pipe CuNi 90/10 tube marine copper nickel pipe custom length copper nickel pipe shipbuilding copper nickel pipe marine C70600 copper nickel pipe 90/10 Cu-Ni pipe
