CuNi 90/10 Seamless Pipe
CuNi 90/10 Seamless Pipe is a copper-nickel alloy pipe made from approximately 90% copper and 10% nickel, commonly identified as UNS C70600. It is widely used in seawater systems because of its excellent resistance to corrosion, biofouling, erosion and stress corrosion cracking.
UNS C70600 / CuNi 90/10 seamless pipes for seawater, shipbuilding, offshore, heat exchanger and marine piping systems. Available according to ASTM B466, EEMUA 144, DIN and project specifications.
- Material: CuNi 90/10, UNS C70600
- Type: Seamless Pipe / Tube
- OD: 6mm – 219mm
- Length: 6m / Custom
- Standards: ASTM B466/ASME B36.19M, EEMUA 144/234, DIN86019/DIN86018, EN
- Certificates: MTC 3.1, PMI, Hydro Test, UT available
As a professional supplier of CuNi 90/10 Seamless Pipe, we provide pipes manufactured according to international standards such as ASTM B466 / ASME SB466, with customized sizes, wall thicknesses and lengths available upon request.
Compared with welded pipe, seamless copper nickel pipe offers uniform structure, smooth internal surface and reliable pressure performance. This makes it a preferred choice for marine engineering, offshore platforms, shipbuilding, desalination plants, heat exchangers and condenser systems.
Compared with conventional carbon steel pipes and many stainless steel grades, CuNi 90/10 seamless pipes maintain reliable performance in chloride-rich environments where long-term durability is critical.
CuNi 90/10 Seamless Pipe Specs
| Item | Description |
| Product Name | CuNi 90/10 Seamless Pipe |
| Material Grade | CuNi 90/10, Copper Nickel 90/10 |
| UNS Number | UNS C70600 |
| Standard | ASTM B466, ASME SB466, EN, DIN, EEMUA, JIS available |
| Manufacturing Type | Seamless |
| Outside Diameter | Customized according to project requirements |
| Wall Thickness | SCH 10, SCH 40, SCH 80 or customized |
| Length | Random length, fixed length or cut-to-size |
| Surface | Pickled, bright, polished or as required |
| Testing | PMI, hydrostatic test, eddy current test, mechanical test, chemical analysis |
| Certification | EN 10204 3.1 / 3.2 available |
CuNi 90/10 Seamless Pipe Standards
ASTM B466 CuNi Pipes
ASTM B466 CuNi pipes are among the most widely specified seamless copper-nickel pipes. For CuNi 90/10, ASTM B466 is commonly associated with UNS C70600 material. It covers requirements for chemical composition, mechanical properties, dimensions, testing and manufacturing quality.
ASME B36.19M CuNi Pipes
ASME B36.19M CuNi pipes usually refer to dimensional requirements such as outside diameter and schedule wall thickness. When used for CuNi 90/10 pipes, it is often combined with a material specification such as ASTM B466 or project-specific requirements.
EEMUA 144 CuNi Pipes
EEMUA 144 CuNi pipes are commonly used in offshore and marine engineering projects. This standard is frequently referenced where copper-nickel piping systems must meet strict service requirements in seawater environments.
EEMUA 234 CuNi Pipes
EEMUA 234 CuNi pipes are often specified for copper-nickel alloy piping systems in marine, offshore and seawater cooling services. It may be used alongside EEMUA 144 depending on the project specification.
DIN 86019 CuNi Pipes
DIN 86019 CuNi pipes are widely used in European shipbuilding and marine piping systems. They are commonly selected for seawater-resistant copper-nickel pipework in vessels, offshore structures and naval systems.
DIN 86018 CuNi Pipes
DIN 86018 CuNi pipes are often related to German marine piping requirements and may be used with DIN 86019 pipe systems. Always confirm whether the project requires pipe, fitting or connected component compliance.
CuNi 90/10 Seamless Pipe Stock
CuNi 90/10 seamless pipes are manufactured with strict dimensional control. The key parameters include outer diameter (OD), wall thickness (WT), and allowable tolerance under ASTM and DIN standards.
- OD range typically: small bore to large diameter industrial tubing
- Wall thickness varies based on pressure rating and application
- Strict tolerance control
Dimensions can be customized based on project requirements and pressure design.
CuNi 90/10 Seamless Pipe Stock — DIN 86019 / DIN 86018
| Specification | DN | OD | S |
| inch | mm | mm | mm |
| 1/2 | 15 | 20 | 1 |
| 3/4 | 20 | 25 | 1.5 |
| 1 | 25 | 30 | 1.5 |
| 11/4 | 32 | 38 | 1.5 |
| 11/2 | 40 | 44.5 | 1.5 |
| 2 | 50 | 57 | 1.5 |
| 21/2 | 65 | 76 | 2 |
| 3 | 80 | 89 | 2 |
| 4 | 100 | 108 | 2.5 |
| 5 | 125 | 133 | 2.5 |
| 6 | 150 | 159 | 2.5 |
| 8 | 200 | 219 | 3 |
| 10 | 250 | 267 | 3 |
| 12 | 300 | 324 | 4 |
| 14 | 350 | 368 | 4 |
| 16 | 400 | 419 | 4 |
Recommended Inquiry Information for DIN CuNi Pipe
For DIN 86019 / DIN 86018 copper nickel pipe inquiry, please provide outside diameter, wall thickness, length, quantity, certificate requirement and delivery destination.
CuNi 90/10 Seamless Pipe Stock — EEMUA 234
| Specification | DN | OD | S 16bar | S 20bar |
| inch | mm | mm | mm | mm |
| 1/2 | 15 | 16 | 2 | 2 |
| 3/4 | 20 | 25 | 2 | 2 |
| 1 | 25 | 30 | 2.5 | 2.5 |
| 11/4 | 32 | 38 | 2.5 | 2.5 |
| 11/2 | 40 | 44.5 | 2.5 | 2.5 |
| 2 | 50 | 57 | 2.5 | 2.5 |
| 21/2 | 65 | 76.1 | 2.5 | 2.5 |
| 3 | 80 | 88.9 | 2.5 | 2.5 |
| 4 | 100 | 108 | 3 | 3 |
| 6 | 150 | 159 | 3 | 3.5 |
| 8 | 200 | 219.1 | 4 | 4.5 |
| 10 | 250 | 267 | 4.5 | 5.5 |
| 12 | 300 | 323.9 | 5.5 | 7 |
| 14 | 350 | 368 | 6.5 | 8 |
| 16 | 400 | 419 | 7 | 9 |
Why EEMUA 234 CuNi Pipe Is Used Offshore
EEMUA 234 copper nickel 90/10 seamless pipe is selected for offshore seawater systems because CuNi 90/10 offers strong resistance to seawater corrosion, erosion and marine biofouling.
CuNi 90/10 Seamless Pipe Stock — ASME B36.19M
| Specification | DN | OD | S |
| inch | mm | mm | mm |
| 1/2 | 15 | 21.3 | 2.11 |
| 3/4 | 20 | 26.7 | 2.11 |
| 1 | 25 | 33.4 | 2.77 |
| 11/4 | 32 | 42.2 | 2.77 |
| 11/2 | 40 | 48.3 | 2.77 |
| 2 | 50 | 60.3 | 2.77 |
| 21/2 | 65 | 73 | 3.05 |
| 3 | 80 | 88.9 | 3.05 |
| 4 | 100 | 114.3 | 3.05 |
| 6 | 150 | 168.3 | 3.4 |
| 8 | 200 | 219.1 | 3.76 |
| 10 | 250 | 273 | 4.19 |
| 12 | 300 | 323.8 | 4.57 |
| 14 | 350 | 355.6 | 4.78 |
| 16 | 400 | 406.4 | 4.78 |
Important Note for ASME B36.19M CuNi Pipe
ASME B36.19M is mainly a dimensional standard. For CuNi 90/10 pipe material quality, it is usually used together with ASTM B466, UNS C70600 material requirements or the customer’s approved project specification.
CuNi Pipe Weight Calculator
Estimate the weight of CuNi pipes by outside diameter, wall thickness, length and quantity. This calculator supports both mm and inch inputs for pipe dimensions.
CuNi Pipe Weight Formula
Weight (kg/m) = ( OD − THK ) × THK × 0.028
- OD (Outside Diameter): outer diameter of the CuNi pipe.
- THK (Wall Thickness): pipe wall thickness.
- The standard calculation uses millimeters (mm) as the default unit for both OD and THK.
- Unit support: mm or inch.
- Conversion factor: 1 inch = 25.4 mm.
This result is provided for engineering estimation only. Actual pipe weight may vary due to manufacturing tolerances, material grade, density variations, and project-specific specifications.
Calculate CuNi Pipe Weight
Chemical Composition of CuNi 90/10
Typical chemical composition for UNS C70600 CuNi 90/10 Seamless Pipe:
| Element | Content |
| Copper Cu | Balance |
| Nickel Ni + Cobalt Co | 9.0 – 11.0% |
| Iron Fe | 1.0 – 1.8% |
| Manganese Mn | Max 1.0% |
| Zinc Zn | Max 1.0% |
| Lead Pb | Max 0.05% |
| Other Elements | As per standard |
The controlled addition of iron and manganese improves resistance to seawater erosion and corrosion, especially under flowing seawater conditions.
Fabrication Properties of CuNi 90/10(C70600)
| Joining Technique | Suitability | |
| Soldering | Excellent | |
| Brazing | Excellent | |
| Oxyacetylene Welding | Fair | |
| Gas Shielded Arc Welding | Excellent | |
| Coated Metal Arc Welding | Good | |
| Spot Weld | Good | |
| Seam Weld | Good | |
| Butt Weld | Excellent | |
| Capacity for Being Cold Worked | Good | |
| Capacity for Being Hot Formed | Good | |
| Machinability Rating | 20 |
CuNi Pipe Welding
TIG welding (GTAW) is the preferred welding method for CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500) pipes, especially for thin-wall tubes, small-diameter piping, and root pass welding. The process provides excellent weld quality, precise heat control, low spatter, and superior corrosion resistance in seawater applications.:contentReference[oaicite:0]{index=0}
Why TIG Welding is Preferred for CuNi Pipes
- Produces clean, high-quality welds with minimal defects.
- Excellent control of heat input for thin-wall CuNi tubing.
- Suitable for all welding positions and pipe diameters.
- Provides smooth root penetration and superior corrosion resistance.
- Widely accepted in marine, naval, and offshore piping systems.
Recommended CuNi Pipe Welding Procedure
- Clean the pipe ends thoroughly to remove oil, grease, moisture, and oxide layers.
- Prepare a proper V-groove for thicker wall pipes.
- Use ERCuNi filler wire to prevent weld porosity and maintain corrosion resistance.
- Apply 100% argon shielding gas and argon back purging for root welding.
- Maintain a short arc length and consistent travel speed.
- For large wall thicknesses, TIG root welding can be followed by MIG (GMAW) or SMAW fill passes.
CuNi 90/10 Seamless Pipe Quality Inspection & Testing
To ensure consistent quality, corrosion resistance, and long-term reliability in marine and industrial applications, every CuNi 90/10 seamless pipe (UNS C70600) can undergo comprehensive inspection and testing according to ASTM, EN, DIN, or customer-specific project requirements.
Available Inspection Methods
- Chemical Composition Analysis – Verifies compliance with CuNi 90/10 alloy chemistry requirements.
- Mechanical Property Testing – Evaluates tensile strength, yield strength, and elongation.
- Hydrostatic Pressure Test – Confirms pressure-bearing capability and leak-tightness.
- Eddy Current Test (ECT) – Detects surface and subsurface defects without damaging the pipe.
- PMI Testing – Positive Material Identification ensures correct alloy grade verification.
- Visual Inspection – Checks overall workmanship and surface condition.
- Dimensional Inspection – Verifies outside diameter, wall thickness, length, and tolerances.
- Flattening Test – Evaluates ductility and structural integrity.
- Flaring Test – Confirms forming performance and resistance to cracking.
- Surface Quality Inspection – Examines scratches, pits, dents, laminations, and other imperfections.
Mill Test Certificates (MTC EN 10204 3.1), third-party inspection reports, and customized testing documentation are available upon request.
CuNi 90/10 Seamless Pipe Packaging and Delivery
All CuNi 90/10 seamless pipes (UNS C70600) are carefully packed to prevent surface scratches, deformation, corrosion, and moisture exposure during storage and international transportation. Packaging methods can be selected according to pipe dimensions, shipping methods, and customer requirements.
Standard Export Packaging Options
- Wooden cases for export shipment
- Wooden pallets
- Moisture-proof plastic wrapping
- Pipe end caps protection
- Waterproof bundled packing
- Container loading packing
- Customized export packaging
Pipe Identification and Marking
- CuNi 90/10 / C70600 grade
- Pipe size (OD × WT)
- Length
- Heat number
- Manufacturing standard
- Quantity
- Customer-specific markings
Professional export packaging helps ensure that CuNi 90/10 seamless pipes arrive safely at shipbuilding, offshore engineering, desalination, heat exchanger, and seawater piping projects worldwide.
Why Choose Our CuNi 90/10 Seamless Pipe?
Our UNS C70600 CuNi 90/10 seamless pipes are manufactured for demanding marine, offshore and industrial applications where corrosion resistance, pressure reliability and long service life are critical.
Stable Material Supply
Reliable production and inventory support for UNS C70600 copper nickel seamless pipes in various dimensions and specifications.
International Standards Compliance
Manufactured according to ASTM B466, ASTM B111, ASME, EN, DIN and EEMUA requirements for marine and industrial projects.
Seamless Pressure Integrity
Seamless construction provides excellent mechanical strength and dependable performance in pressure piping systems.
Excellent Seawater Corrosion Resistance
Designed for long-term service in seawater cooling systems, desalination plants, shipbuilding and offshore platforms.
Custom Manufacturing Available
Outside diameter, wall thickness, pipe length and packaging can be customized according to project specifications.
Strict Quality Assurance
Full material traceability with chemical composition analysis, mechanical testing and dimensional inspection available upon request.
Whether you require standard stock dimensions or custom-manufactured CuNi 90/10 seamless pipes, our engineering and production team can provide reliable solutions for shipbuilding, offshore oil & gas, seawater cooling, heat exchanger and industrial piping applications.
Request a Quote for CuNi 90/10 Seamless Pipe
If you are looking for a reliable CuNi 90/10 Seamless Pipe supplier, please send us your required size, wall thickness, length, standard and quantity. Our team will provide a competitive quotation with technical details, delivery time and available inspection options.
For fast quotation, please provide:
- Material grade: CuNi 90/10 / UNS C70600
- Standard: ASTM B466, ASME SB466 or other applicable standards
- Outside diameter and wall thickness
- Length and quantity required
- Surface finish and pipe end requirements
- Testing, inspection and certification requirements
- Delivery destination or port of discharge
Request a Quote for CuNi 90/10 Seamless Pipe
Looking for ASTM B466 UNS C70600 CuNi 90/10 seamless pipe? Send us your required dimensions, wall thickness, length, quantity and project specifications.
What Is CuNi 90/10 Seamless Pipe?
CuNi 90/10 Seamless Pipe is a seamless copper-nickel alloy pipe manufactured without welded joints. The seamless production process provides uniform wall thickness, improved pressure resistance, and enhanced reliability in demanding operating conditions.
The alloy contains small additions of iron and manganese, which help improve resistance to impingement attack and increase durability in flowing seawater systems.
Material Designation
- UNS C70600
- CuNi 90/10
- Copper Nickel 90/10
- ASTM B466 C70600 Seamless Pipe
- ASME SB466 C70600
Key Features of CuNi 90/10 Seamless Pipe
CuNi 90/10 Seamless Pipe is widely recognized for its outstanding seawater corrosion resistance, excellent durability, and reliable performance in marine, offshore, shipbuilding, desalination, and heat exchanger applications. The seamless construction further enhances pressure-bearing capability and operational safety in critical piping systems.
Excellent Seawater Corrosion Resistance
CuNi 90/10 alloy develops a dense and stable protective oxide layer when exposed to seawater. This natural film significantly reduces corrosion rates and protects the pipe against long-term degradation in aggressive marine environments.
Ideal for seawater cooling systems, offshore platforms, condensers, and desalination plants.
Natural Resistance to Marine Biofouling
The copper content in CuNi 90/10 Seamless Pipe helps prevent the attachment and growth of barnacles, algae, mussels, and other marine organisms. This characteristic improves flow efficiency while reducing cleaning frequency and maintenance costs.
Maintains higher heat transfer efficiency and lower lifecycle operating expenses.
Extended Service Life
CuNi 90/10 piping systems are known for their exceptional durability. Under proper operating conditions, many installations continue performing reliably for several decades with minimal loss of mechanical properties or corrosion damage.
Reduces replacement frequency and lowers total ownership costs.
Reliable Seamless Construction
Unlike welded pipes, seamless CuNi 90/10 pipes contain no longitudinal weld seam, resulting in more uniform wall thickness, improved structural integrity, enhanced pressure resistance, and greater long-term reliability in demanding industrial applications.
Suitable for high-pressure fluid transportation and critical marine systems.
Excellent Fabrication and Installation Performance
CuNi 90/10 Seamless Pipe offers good workability and can be easily cut, bent, flared, expanded, brazed, and welded using established fabrication techniques. This flexibility simplifies installation in complex piping networks.
Supports efficient fabrication for custom marine and industrial projects.
Stable Mechanical Properties
The alloy provides a balanced combination of strength, ductility, and toughness, enabling reliable performance under fluctuating temperatures, vibration, and seawater flow conditions. It also exhibits good thermal conductivity for heat transfer applications.
Commonly used in heat exchangers, condensers, and shipboard piping systems.
CuNi 90/10 Seamless Pipe Applications in Marine and Offshore Industries
Shipbuilding and Marine Piping Systems
CuNi 90/10 seamless pipes are extensively used in commercial vessels, naval ships, cruise ships, ferries, and cargo carriers. They are ideal for seawater piping networks, cooling circuits, ballast systems, bilge lines, and onboard fire protection systems where reliability and corrosion resistance are critical.
Offshore Oil & Gas Platforms
In offshore drilling rigs and production platforms, CuNi 90/10 pipes provide dependable performance in splash zones and seawater handling systems. Their resistance to marine corrosion helps ensure safe and continuous operation under demanding offshore conditions.
Seawater Cooling Systems
Marine engines, offshore equipment, and coastal industrial facilities use CuNi 90/10 piping for seawater cooling circuits. The alloy's resistance to erosion corrosion caused by high-velocity seawater makes it particularly suitable for continuous cooling applications.
Ballast Water and Fire Water Lines
The material performs exceptionally well in ballast water management systems and marine fire water pipelines. Its natural anti-fouling properties help minimize marine organism growth, maintaining flow efficiency over long service periods.
Why CuNi 90/10 is Preferred for Marine Applications
Unlike many conventional piping materials, CuNi 90/10 develops a stable protective oxide layer when exposed to seawater. This protective film significantly improves resistance to pitting, crevice corrosion, and microbiologically influenced corrosion (MIC), making it highly suitable for long-term marine service.
For shipbuilders, offshore contractors, and marine equipment manufacturers, CuNi 90/10 seamless pipe offers an optimal balance of corrosion resistance, mechanical strength, fabrication flexibility, and lifecycle cost efficiency.
Additional Industrial Applications
- Heat Exchangers and Condensers
- Desalination Plants
- Coastal Power Stations
- Chemical Processing Equipment
- Hydraulic Systems in Marine Environments
- Brine Transfer Pipelines
- Seawater Intake and Discharge Systems
- Aquaculture Facilities
- Harbor and Port Infrastructure
With decades of proven performance in marine and offshore environments, CuNi 90/10 Seamless Pipe remains one of the most trusted solutions for seawater piping systems, shipbuilding projects, offshore platforms, and coastal industrial facilities worldwide.
Advantages of CuNi 90/10 Seamless Pipe Over Stainless Steel
When exposed to seawater, CuNi 90/10 offers several advantages:
| Property | CuNi 90/10 | Stainless Steel |
| Seawater Corrosion Resistance | Excellent | Moderate to Good |
| Biofouling Resistance | Excellent | Limited |
| Chloride Resistance | Excellent | Risk of Pitting |
| Maintenance Requirements | Low | Medium |
| Service Life in Marine Environment | Long | Variable |
For seawater handling systems, many engineers prefer copper nickel alloys due to their proven long-term performance.
FAQ – CuNi 90/10 Seamless Pipe
What is CuNi 90/10 Seamless Pipe?
CuNi 90/10 Seamless Pipe is a copper nickel alloy pipe manufactured from approximately 90% copper and 10% nickel, commonly designated as UNS C70600. It is widely used in seawater piping systems, marine engineering and offshore applications because of its excellent corrosion resistance and reliable service performance.
What is the difference between CuNi 90/10 and CuNi 70/30?
CuNi 90/10 contains approximately 10% nickel, while CuNi 70/30 contains around 30% nickel. CuNi 70/30 generally provides higher strength and improved resistance in more aggressive seawater environments, whereas CuNi 90/10 offers a cost-effective solution for most marine and seawater applications.
Is CuNi 90/10 suitable for seawater service?
Yes. CuNi 90/10 is one of the most widely used materials for seawater systems. It offers excellent resistance to seawater corrosion, biofouling and erosion-corrosion, making it suitable for marine piping, condensers and heat exchangers.
Which standard is commonly used for CuNi 90/10 Seamless Pipe?
ASTM B466 and ASME SB466 are commonly specified standards for seamless copper nickel pipe and tube, including UNS C70600 CuNi 90/10 material used in marine and industrial applications.
Can you supply custom sizes and lengths?
Yes. CuNi 90/10 Seamless Pipe can be manufactured and supplied in custom outside diameters, wall thicknesses and lengths according to project specifications and application requirements.
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