CuNi 90/10 Pipe, also known as copper nickel 90/10 pipe, is a corrosion-resistant alloy pipe made with copper as the base material, containing approximately 10% nickel, as well as small amounts of iron (Fe) and manganese (Mn).
2" 90/10 copper nickel alloy pipe refers to a copper nickel alloy pipe with a nominal size of 2 inches, manufactured in strict accordance with international standards. This size belongs to the medium-diameter pipe category and is one of the most widely used sizes in shipbuilding and marine engineering. It provides sufficient flow capacity while maintaining good installation convenience.
Product Forms
The 2" 90/10 copper nickel pipe can be divided into two forms according to production standards:
Seamless Pipe
Manufactured by hot extrusion or cold drawing process, with no weld seam. It is suitable for high-pressure applications and working conditions requiring high reliability. It is produced according to standards such as ASTM B466 and EEMUA 234.
Welded Pipe
Manufactured by rolling and welding copper nickel plates. It is suitable for general engineering applications and is produced according to ASTM B467.
Both forms offer excellent corrosion resistance and mechanical properties. The selection of seamless or welded pipe mainly depends on the specific application pressure rating and project specification requirements.
Alloy Composition
The typical chemical composition of 90/10 copper nickel alloy / UNS C70600 is as follows:
| Element | Copper (Cu) | Nickel (Ni) | Iron (Fe) | Manganese (Mn) | Lead (Pb) | Carbon (C) |
| Content (%) | Balance / ≥86.5 | 9.0 - 11.0 | 1.0 - 1.8 | ≤1.0 | ≤0.02 | ≤0.05 |
Excellent Product Features of 90/10 Copper Nickel Alloy
Resistance to Seawater Erosion and Pitting Corrosion
After contact with seawater, the pipe surface can quickly form a dense, strong, and self-repairing oxide protective film. This film effectively blocks chloride ion corrosion and provides excellent protection in seawater environments.
Resistance to Marine Biofouling
Copper has natural bio-inhibitory properties. The pipe surface can naturally prevent the attachment and growth of marine organisms such as barnacles, mussels, and algae. This helps keep the inside of the pipeline smooth and unobstructed for a long time, greatly reducing downtime and maintenance costs.
Excellent Machinability and Weldability
Thanks to its well-balanced mechanical properties, this pipe has excellent ductility and toughness. Whether for on-site cold bending, flaring, flanging, or welding processes such as TIG and MIG, it can be easily formed. The weld seam is dense and free of pores, allowing the pipe to integrate perfectly into complex piping systems.
Immunity to Stress Corrosion Cracking / SCC
In chloride-containing high-temperature and high-pressure environments, many stainless steel materials are prone to catastrophic stress corrosion cracking. Copper nickel pipe has natural immunity to this issue, ensuring long-term safe operation of high-flow systems.
Technical Parameters
| Item | Parameter |
| Outer Diameter / OD | 2" / approx. 50.8 mm |
| Wall Thickness / WT | SCH 10 / 40 / 80, customizable |
| Length | 6 m / 12 m or fixed length |
| Manufacturing Method | Seamless / Welded |
| Standards | ASTM B111 / ASTM B466 |
| Surface Treatment | Pickling, polishing, sandblasting |
Mechanical Properties
| Property | Annealed / O60 | Light Drawn / H55 | Hard / H80 | Description |
| Tensile Strength | ≥260 MPa | ≥310 MPa | ≥345 MPa | Meets most industrial application requirements |
| Yield Strength | ≥90 MPa | ≥240 MPa | ≥275 MPa | - |
| Elongation | ≥30% | ≥12% | - | Excellent plasticity in annealed condition |
| Hardness | 45 HRT max | 45–70 HRT | 63 HRT min | - |
Physical Properties
| Property | Value | Unit |
| Density | 8.90 | g/cm³ |
| Melting Range | 1100–1145 | °C |
Specific Heat Capacity | 0.09 | cal/g°C @ 20°C |
| Thermal Conductivity | Approx. 50 | W/(m·K) |
| Electrical Resistivity | Approx. 19 | μΩ·cm |
| Elastic Modulus | 135 | GPa, annealed condition |
| Relative Magnetic Permeability | <1.5 | Weakly magnetic |
Main Application Fields
Shipbuilding and Offshore Engineering
Used for main seawater cooling system pipelines, modern high-flow fire-fighting pipeline networks, condenser systems, and large ballast water transmission lines.
Seawater Desalination and Comprehensive Utilization
Used in core heat exchanger tube bundles of MSF / multi-stage flash and RO / reverse osmosis desalination units, as well as high-flow water collection and transmission pipelines.
Coastal Nuclear Power Plants and Conventional Power Plants
Suitable for large seawater circulating pump outlet main lines and core pipelines of condenser cooling systems.
Petrochemical and Heavy Industries
Used for high-efficiency heat exchangers, condensers, and offshore oil platform process pipelines handling saline wastewater and high-concentration chemical media.
Matching Pipe Fittings
A complete piping system requires matching pipe fittings. The 2" 90/10 copper nickel alloy pipe can be supplied with the following fittings in accordance with EEMUA 234 and ANSI B16.9 standards:
Fitting Type | Standard | Description |
| 90° Long Radius Elbow | NAVSEA 810-1385880 | Center distance 94.5 mm |
| 45° Elbow | ANSI B16.9 | Standard size |
| Equal / Reducing Tee | EEMUA 146 / DIN 86088 | Branch connection |
| Concentric / Eccentric Reducer | EEMUA 146 / DIN 86089 | Diameter transition connection |
| Butt-Weld Flange | ANSI B16.5 | Class 150 / 300 |
| Pipe Cap | ANSI B16.9 | Pipeline sealing |
| Loose Flange Stub End | EEMUA 234 | Easy disassembly and maintenance |
Quality Certifications
The 2" 90/10 copper nickel alloy pipe can comply with the following international standards:
Standard No. | Name | Scope of Application |
| ASTM B466 | Standard Specification for Seamless Copper Nickel Pipe | Mainstream standard in the U.S. market |
| ASTM B467 | Standard Specification for Welded Copper Nickel Pipe | Standard for welded pipe products |
| EEMUA 234 | Specification for Copper Nickel Piping Systems for Offshore and Onshore Applications | European and international engineering projects |
| BS 2871 CN102 | British Standard for Copper Nickel Tubes | Commonly used in Commonwealth countries |
| DIN 86019 / EN 12449 | European Standard for Seamless Round Copper and Copper Alloy Tubes | EU market |
| JIS H3300 C7060 | Japanese Standard for Seamless Copper and Copper Alloy Tubes | Japanese market |
| NAVSEA 810 | U.S. Naval Sea Systems Command Standard | Military and high-reliability projects |
International Certifications
The 2" 90/10 copper nickel pipe products manufactured in accordance with the above standards can be approved by the following internationally recognized organizations:
Lloyd's Register / LR: Lloyd's Register of Shipping
DNV: Det Norske Veritas
ABS: American Bureau of Shipping
BV: Bureau Veritas
Why Choose Us?
Before delivery, every 2" CuNi 90/10 copper nickel pipe must pass our strict quality control system.
Quality Inspection
100% Eddy Current Testing / ET and Ultrasonic Testing / UT
Ensures there are no micro-cracks, sand holes, slag inclusions, or other defects inside the pipe wall or at large-diameter weld seams.
Strict Air Tightness and Hydrostatic Testing
Limit testing is carried out under pressures higher than standard requirements to completely eliminate leakage risks under high-flow operating conditions.
Complete Traceability Chain
Original MTC / Material Test Certificate / EN 10204 3.1 is supplied with the goods. Chemical composition and mechanical properties are fully traceable throughout the production process.
Conclusion
2" 90/10 copper nickel alloy pipe / UNS C70600 has become an indispensable key material in global marine engineering, shipbuilding, seawater desalination, and power industries due to its outstanding seawater corrosion resistance, excellent anti-biofouling performance, good mechanical properties, and proven application experience.
If you need to know the stock availability of different wall thicknesses, such as Sch 10 / Sch 40 / Sch 80 or class-rated specifications, request samples, or obtain the latest factory quotation, please feel free to contact our experienced sales engineers.
