Copper Nickel Pipes are widely used in seawater systems, shipbuilding, offshore platforms, desalination plants, power stations and heat exchangers because they offer excellent resistance to seawater corrosion, biofouling and erosion. With stable mechanical performance and long service life, copper nickel piping is a reliable choice for demanding marine and industrial environments.
We supply Copper Nickel Pipes in both Seamless Pipe and Seam-Welded Pipe types, manufactured according to international project requirements and standards including DIN 86019 / DIN 86018, EEMUA 234 and ASME B36.19M.
Copper Nickel Pipes Specifications
Our copper nickel pipes are supplied for seawater systems, shipbuilding, offshore platforms, desalination plants, heat exchangers and coastal engineering projects. Available in CuNi 90/10 and CuNi 70/30 grades, these pipes offer reliable corrosion resistance, good strength and stable performance in marine environments.
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Product Name
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Copper Nickel Pipes / CuNi Pipes / Copper Nickel Alloy Pipes
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Material Grades
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CuNi 90/10, CuNi 70/30, C70600, C71500, CuNi10Fe1Mn, CuNi30Mn1Fe
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Pipe Type
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Seamless Copper Nickel Pipe, Welded Copper Nickel Pipe
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Standards
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ASTM B466, ASTM B467, DIN 86019, DIN 86018, EEMUA 144, EEMUA 234, ASME B36.19M or project specifications
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Outside Diameter
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Standard sizes or customized dimensions according to drawings
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Wall Thickness
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Schedule thickness, metric thickness or customized wall thickness
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Length
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Random length, fixed length or cut-to-size length
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Pipe Ends
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Plain end, beveled end, capped end or prepared for welding
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Surface Finish
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Pickled, cleaned, polished, bright finish or as required
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Testing
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Chemical analysis, mechanical test, dimensional inspection, hydrostatic test, eddy current test, ultrasonic test and other NDT inspections when required
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Documentation
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Material Test Certificate, inspection report, packing list and other project documents upon request
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Applications
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Seawater piping, cooling water systems, marine piping, offshore engineering, desalination plants, condenser systems and heat exchanger equipment
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If your project requires specific copper nickel pipe sizes, pressure ratings, standards or inspection requirements, we can review your drawings, technical datasheets or purchase specifications and recommend a suitable supply solution.
CuNi 90/10 Pipe CuNi 70/30 Pipe Seamless CuNi Pipe Welded CuNi Pipe Marine Piping Custom Size Available Hydrostatic Test NDT Inspection
Copper Nickel Pipe Types for Marine and Offshore Systems
Copper nickel pipes are commonly supplied in seamless and seam-welded forms. Each type offers reliable seawater corrosion resistance, good mechanical performance and long service life in marine, shipbuilding, offshore and industrial piping systems.
Seamless Copper Nickel Pipe
Seamless copper nickel pipe is manufactured without a longitudinal weld, giving the pipe a continuous structure and consistent strength throughout its length. This makes it a preferred choice for systems where pressure stability, leak resistance and dependable performance are important.
It is widely used in seawater cooling systems, hydraulic lines, condensers, heat exchangers and other critical marine piping applications. Cu-Ni 90/10 and Cu-Ni 70/30 seamless pipes are often selected for their strong resistance to seawater corrosion, biofouling and erosion.
Key advantages:
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No longitudinal weld seam for improved structural uniformity
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Reliable performance under pressure and temperature changes
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Smooth internal surface for stable fluid flow
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Excellent resistance to seawater corrosion and marine fouling
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Suitable for demanding shipbuilding, offshore and naval applications
Seam-Welded Copper Nickel Pipe
Seam-welded copper nickel pipe is produced from Cu-Ni strip or plate and welded along the length of the pipe. It provides a practical and economical solution for large diameters, long pipe runs and projects that require consistent dimensions with efficient production lead times.
With proper welding and quality control, welded copper nickel pipe delivers dependable corrosion resistance in seawater service. It is commonly used in ship cooling water lines, ballast systems, desalination plants, offshore platforms and industrial seawater pipelines.
Key advantages:
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Cost-effective option for larger pipe sizes
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Suitable for long-distance marine and offshore piping systems
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Good dimensional accuracy and stable wall thickness
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Available in a wide range of diameters and specifications
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Proven performance in shipbuilding, desalination and seawater systems
Copper Nickel Pipe Standards We Supply
Our copper nickel pipes are manufactured and supplied to recognized international standards for seawater piping, shipbuilding, offshore, desalination and heat exchanger applications. Material grades, dimensions, testing requirements and documentation can be matched to the project specification.
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Standard
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Typical Application
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DIN 86019
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Seamless copper nickel pipes commonly used in marine, shipbuilding and seawater cooling systems.
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DIN 86018
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Welded copper nickel pipes for marine piping, ballast systems, firewater lines and other seawater service applications.
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EEMUA 234
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Recommended practice for 90/10 copper nickel alloy piping in seawater systems, including guidance on design, fabrication and installation.
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ASTM B466 / ASTM B466M
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Seamless copper nickel pipe and tube specification for pressure, condenser, heat exchanger and marine service.
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ASTM B467 / ASTM B467M
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Welded copper nickel pipe specification for industrial, offshore and seawater piping projects.
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ASME B36.19M
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Dimensional reference for pipe sizes and wall thickness schedules when stainless steel pipe dimensions are specified by the project.
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We can also supply copper nickel pipes in accordance with EN standards, ASTM requirements, class society rules or customer-specific project specifications. Mill test certificates, chemical composition, mechanical properties, PMI, hydrostatic testing and third-party inspection can be provided when required.
Copper Nickel Pipe Materials and Grades
Copper nickel pipes are mainly produced in two marine-grade alloys: CuNi 90/10 and CuNi 70/30. Both grades are widely used in seawater piping systems because they form a stable protective surface film, helping reduce corrosion, biofouling and long-term maintenance in marine environments.
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CuNi 90/10 Pipe – UNS C70600 / CuNi10Fe1Mn
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CuNi 70/30 Pipe – UNS C71500 / CuNi30Mn1Fe
CuNi 90/10 Pipe – UNS C70600
CuNi 90/10 is the most commonly specified copper nickel pipe grade for shipbuilding, offshore platforms, desalination plants and general seawater service. Its balanced composition provides reliable corrosion resistance, good weldability and strong performance in clean, flowing seawater.
This grade is often selected for seawater cooling lines, ballast systems, firewater systems, bilge lines and other marine piping where durability and cost efficiency are both important.
CuNi 70/30 Pipe – UNS C71500
CuNi 70/30 contains a higher nickel content than 90/10, giving it improved resistance to erosion, high-velocity seawater and more aggressive operating conditions. It is commonly used where seawater flow rates, pressure or exposure levels are more demanding.
Typical applications include naval vessels, offshore systems, heat exchangers, condensers and critical seawater pipelines that require a higher safety margin against corrosion and impingement attack.
Copper Nickel Pipe Chemical Composition
Copper Nickel Pipe Features for Marine and Offshore Applications
Copper Nickel Pipes, including Cu-Ni 90/10 and Cu-Ni 70/30 grades, are widely used in seawater piping systems because they offer dependable corrosion resistance, good mechanical strength and stable performance in harsh marine environments.
Excellent Seawater Corrosion Resistance
Copper nickel alloy forms a protective surface layer when exposed to seawater, helping the pipe resist corrosion in shipbuilding, offshore platforms and coastal industrial systems.
Reduced Marine Biofouling
The natural properties of copper nickel help limit the buildup of marine organisms inside piping systems, supporting smoother flow and reducing routine cleaning requirements.
Reliable Long-Term Performance
Designed for demanding service conditions, copper nickel pipes maintain stable performance in seawater cooling, ballast, bilge, firewater and desalination piping applications.
Why Choose Copper Nickel Pipes?
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High resistance to seawater corrosion, brine and marine atmosphere
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Suitable for Cu-Ni 90/10 and Cu-Ni 70/30 piping systems
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Good resistance to erosion-corrosion under proper flow conditions
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Natural resistance to marine biofouling and internal deposits
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Strong thermal conductivity for heat exchanger and cooling systems
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Long service life with lower maintenance requirements
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Easy to fabricate, weld, bend and install on site
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Reliable choice for shipbuilding, offshore, desalination and power plant piping
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Suitable for low to moderate pressure seawater service
In marine piping systems, material reliability directly affects safety, maintenance cost and service life. Copper nickel pipes are often selected where stainless steel or carbon steel may require additional protection against seawater exposure. Their combination of corrosion resistance, workability and durability makes them a practical solution for long-term seawater handling applications.
Copper Nickel Pipe Stock
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Available types: Copper Nickel seamless pipe and Copper Nickel welded pipe
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Common grades: CuNi 90/10 C70600 and CuNi 70/30 C71500
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OD range: small bore tubing to large diameter industrial and marine pipes
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Wall thickness: available according to pressure rating, design standard and project requirements
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Strict control of outside diameter, wall thickness, length and ovality
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Stock sizes available for fast delivery; customized dimensions can also be produced
Copper Nickel pipe dimensions, material grade, wall thickness and pipe type can be customized according to project specifications and pressure design requirements.
Why Choose Us
We supply CuNi pipes with controlled material quality, accurate dimensions and consistent production standards, helping customers reduce installation risk and maintain long-term system performance.
Our Copper Nickel Seamless Pipes and Seam-Welded Copper Nickel Pipes are manufactured and inspected according to project requirements, covering common grades such as CuNi 90/10 and CuNi 70/30. From raw material sourcing to final packing, each order is handled with practical quality control and clear documentation.
What Makes Our Copper Nickel Pipes a Practical Choice?
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Available in seamless and seam-welded construction for different pressure and size requirements
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Produced to DIN, EEMUA, ASME, ASTM and customer-specified standards
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Suitable for seawater cooling, bilge systems, fire water lines, desalination and offshore platforms
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Stable corrosion resistance in marine and chloride-containing environments
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Custom size, wall thickness, length and end preparation available on request
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Inspection support including dimensional checks, visual inspection and required testing
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Material certificates and technical documents available for project approval
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Export-grade packaging designed for safe long-distance transportation
Whether your project requires Copper Nickel Seamless Pipe for a critical seawater service line or Seam-Welded Copper Nickel Pipe for large-diameter marine piping, we can provide a reliable supply solution based on your drawings, standards and delivery schedule.
Copper Nickel Pipe Quality Control
Reliable quality control is critical for copper nickel pipes used in seawater systems, shipbuilding, desalination plants and offshore engineering projects. Each order can be inspected and tested according to the applicable manufacturing standard, customer specification or project quality plan before shipment.
Our inspection process focuses on material accuracy, dimensional consistency, pressure performance and surface condition, helping ensure that the supplied Cu-Ni pipes are suitable for demanding marine and industrial environments.
Inspection and testing options
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Chemical composition analysis to verify material grade
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Mechanical properties testing when required by the specification
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Outside diameter, wall thickness and length inspection
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Visual inspection for surface defects and workmanship
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Hydrostatic pressure testing for pressure-bearing applications
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Eddy current testing or ultrasonic testing upon request
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PMI testing for positive material identification
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Review of marking, heat number and traceability records
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Material test certificates according to EN 10204 3.1 or 3.2
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Third-party inspection support when required by the project
After inspection, the pipes are carefully protected and packed to reduce the risk of surface damage, contamination, moisture exposure and deformation during handling and transportation.
FAQ – Copper Nickel Pipes
What are Copper Nickel Pipes used for?
Copper Nickel Pipes are mainly used in seawater piping systems, shipbuilding, offshore platforms, desalination plants, condensers, heat exchangers, and power plant cooling systems.
What is the difference between Seamless Pipe and Seam-Welded Pipe?
Seamless Pipe has no welded seam and is preferred for higher reliability and pressure applications. Seam-Welded Pipe has a longitudinal weld seam and is often selected for larger diameters and cost-effective piping systems.
Which standards can your Copper Nickel Pipes meet?
We can supply Copper Nickel Pipes according to DIN 86019, DIN 86018, EEMUA 234, and ASME B36.19M, as well as other project-specific standards when required.
Which copper nickel grades are available?
Common grades include CuNi 90/10, C70600, CuNi10Fe1Mn, CuNi 70/30, C71500, and CuNi30Mn1Fe.
Can Copper Nickel Pipes be customized?
Yes. Size, wall thickness, length, end type, surface condition, inspection requirements, and packaging can be customized according to customer specifications.
Do copper pipes have nickel?
Standard copper pipes are usually made from pure copper or copper alloys and do not normally contain significant nickel. Copper Nickel Pipes, however, are alloyed with nickel, commonly in 90/10 or 70/30 copper-nickel compositions.
What is the difference between copper and copper-nickel?
Copper is mainly pure copper, known for excellent thermal and electrical conductivity. Copper-nickel is an alloy of copper and nickel, offering better seawater corrosion resistance, higher strength, and improved durability in marine and offshore environments.
Is cupronickel stronger than copper?
Yes. Cupronickel, also called copper-nickel, is generally stronger and more resistant to corrosion than pure copper, especially in seawater and marine service conditions.
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