CuNi 90/10 Copper Nickel Pipe Fittings
Professional CuNi 90/10 copper nickel pipe fittings manufacturer. Supply marine copper nickel elbows, tees, reducers, flanges, BSP threaded fittings and seamless pipes for seawater piping systems. ASTM, DIN, EEMUA standards.
CuNi 90/10 (C70600 copper nickel alloy) is widely used in marine seawater systems due to excellent corrosion resistance, biofouling resistance, weldability and long-term stability. It is commonly applied in shipbuilding, offshore platforms, desalination plants and coastal industrial pipelines.
We are a professional CuNi 90/10 copper nickel pipe fittings manufacturer, supplying C70600 marine grade fittings for seawater piping systems. Our product range includes copper nickel seamless pipes, 90° and 45° elbows, marine inner weld flanges, equal tees, reducing tees, concentric reducers, eccentric reducers, pipe caps, BSP sockets, BSP threaded nipples and reducing nipples.
In addition to CuNi 90/10, we also supply CuNi 70/30 (C71500) copper nickel fittings for higher strength and more demanding seawater and offshore applications.
Our CuNi fittings are manufactured according to ASTM, DIN, JIS, EN and customer project standards. With excellent seawater corrosion resistance, weldability and long service life, CuNi 90/10 fittings are widely used in shipbuilding, offshore platforms, desalination plants, marine cooling systems and shipboard seawater pipelines.
CuNi 90/10 Pipe Fittings Product Range
High-performance C70600 Copper Nickel fittings for marine seawater systems, shipbuilding, offshore engineering and industrial piping applications.
Copper Nickel Pipes
Available in seamless and welded configurations, our copper nickel pipe range covers standard marine pipe sizes from DN15 to DN150 and complies with ASTM B111, ASME SB111 and marine engineering specifications.
CuNi 90/10 Seamless Pipe
Standard Marine Pipe1" CuNi 90/10 Pipe
DN25 Copper Nickel Pipe1-1/4" CuNi 90/10 Pipe
DN32 Copper Nickel Pipe1-1/2" CuNi 90/10 Pipe
DN40 Copper Nickel Pipe2" CuNi 90/10 Pipe
DN50 Copper Nickel Pipe4" / 5" Large Size CuNi Pipe
Large Diameter Copper Nickel PipeManufactured in compliance with international marine engineering standards, our CuNi 90/10 pipes meet ASTM B111 / ASME SB111 specifications for seamless copper alloy tubes, and are suitable for applications governed by major classification societies such as DNV (Det Norske Veritas), ABS (American Bureau of Shipping), and Lloyd’s Register marine standards.
Copper Nickel Elbows
Copper nickel elbows designed for seawater piping systems, shipbuilding, offshore engineering, and desalination applications. Available in both 90° and 45° configurations with long radius (LR) and short radius (SR) options for optimized flow performance and corrosion resistance.
90° Long Radius Copper Nickel Elbow
Used in marine seawater systems where gradual direction change improves flow efficiency and reduces turbulence.
45° Long Radius Copper Nickel Elbow
Ideal for compact piping layouts in shipbuilding and offshore platforms requiring smooth directional change.
45° Short Radius Copper Nickel Elbow
Suitable for tight installation spaces where space efficiency is more important than flow optimization.
Marine Inner Weld Flanges
5K Inner Weld Flange
JIS Marine Flange10K Inner Weld Flange
JIS Marine FlangeWe also supply a full range of CuNi 90/10 (C70600) copper nickel flange fittings for marine and offshore piping systems, including stub end, slip-on, welding neck, socket weld, threaded, and blind flange types. All products are designed to ensure excellent seawater corrosion resistance and long-term reliability in harsh marine environments.
CuNi Stub End Flange
CuNi Slip-On Stub End Flange
CuNi Welding Neck Flange
CuNi Slip On Flange
CuNi Socket Weld Flange
CuNi Threaded Flange
CuNi Blind Flange
Copper Nickel Tees (CuNi Pipe Fittings)
Copper Nickel Tees are corrosion-resistant CuNi pipe fittings widely used in marine seawater systems, offshore engineering, and shipbuilding applications. Available in equal and reducing configurations for fluid distribution and pipeline branching systems.
Equal Tee
Straight Tee | Equal Branch Tee for CuNi Pipe SystemsReducing Tee
Unequal Tee | Branch Size Reduction Tee for Copper Nickel PipingCopper Nickel Concentric Reducer | CuNi 90/10 Pipe Fittings
Copper Nickel Concentric Reducers are widely used pipe fittings in marine and offshore piping systems. The most popular material is CuNi 90/10 (C70600), offering excellent seawater corrosion resistance, biofouling resistance, and long-term durability.
Concentric Reducer
Con-Reducer | CuNi 90/10 | Seamless Pipe Fitting | Marine GradeEccentric Reducer
Ecc Reducer | CuNi 90/10 & 70/30 | Pipe Flow Transition FittingThese fittings are designed to connect pipes of different diameters while maintaining smooth and stable flow, making them essential for seawater cooling systems, shipbuilding, offshore platforms, and desalination plants.
BSP Threaded Fittings
BSP threaded fittings are widely used in industrial piping systems for low to medium pressure connections. They include male and female threaded components designed for secure sealing in water, oil, gas, and marine applications.
BSP Socket (Female Socket)
Internal thread connector for joining two male BSP threaded pipes. Used for straight pipe extension and system repair.BSP Threaded Nipple (Male Nipple)
External thread pipe fitting used to connect two female BSP threaded components. Available in barrel and hex types.Reducing Nipple (Hex / Barrel Type)
Male threaded reducer fitting for connecting different pipe sizes. Common in pressure reduction and system transitions.We also supply BSPT threaded fittings, BSPP adapters, hex nipples, couplings, bushings, and custom stainless steel pipe nipple solutions for marine and industrial piping systems.
CuNi 90/10 Pipe Caps (Copper Nickel End Caps)
Copper Nickel pipe caps are primarily manufactured in CuNi 90/10 (C70600), widely used in marine seawater systems for its excellent corrosion resistance and long service life. In addition, CuNi 70/30 (C71500) pipe caps are also available for higher velocity seawater conditions and more demanding offshore environments.
CuNi Pipe Cap
Copper Nickel End Cap | ASTM B111 C70600 | Marine Pipe ClosureProduced in compliance with ASTM B111 / ASME SB111 standards, these end caps ensure reliable sealing performance against seawater corrosion, biofouling, and chloride-induced stress corrosion cracking, making them ideal for shipbuilding, offshore platforms, and desalination plants.
CuNi 90/10 Material Grades and Standards
| Item | Common Standards / Grades |
| US Grade | C70600 |
| European Grade | CW352H |
| German Standard | CuNi10Fe1Mn |
| Common Material Name | CuNi 90/10 |
| Pipe Standards | ASTM B466, ASTM B111, DIN 86019, EEMUA 144 |
| Fittings Standards | DIN, ASTM, JIS, EN, Customer Drawings |
| Flange Standards | DIN, JIS, ANSI, Marine Standard |
| Application Standard | Marine Seawater Piping Systems |
CuNi 90/10 fittings typically contain approximately 90% copper and 10% nickel, with small additions of iron and manganese to improve resistance to seawater corrosion and erosion. Compared with carbon steel and stainless steel, CuNi 90/10 offers superior long-term stability in marine seawater environments.
CuNi 90/10 Chemical Composition (UNS C70600)
All types of standard copper-nickel alloys( CuNi90/10 ) Comparison of chemical ingredients
| KME CuNi90/10 | DIN 17664 2.0882 | BS 2871 CN102 | ASTM B466 C70600 | JIS H3300 C7060T | DIN 86019 2.1972 | EEMUA 234 UNS 7060X | GB/T 5231 BFe10-1.6-1 | |
| Ni% | 10.0-11.0 | 9.0-11.0 | 10.0-11.0 | 9.0-11.0 | 9.0-11.0 | 9.0-11.0 | 10.0-11.0 | 9.0-11.0 |
| Fe% | 1.5-1.8 | 1.0-2.0 | 1.0-2.0 | 1.0-1.8 | 1.0-1.8 | 1.5-1.8 | 1.5-2.0 | 1.5-1.8 |
| Mn% | 0.6-1.0 | 0.5-1.0 | 0.5-1.0 | max.1.0 | 0.2-1.0 | 0.5-1.0 | 0.5-1.0 | 0.5-1.0 |
| C% | max.0.05 | max.0.05 | max.0.05 | max.0.05 | max.0.05 | max.0.05 | max.0.05 | |
| Pb% | max.0.01 | max.0.03 | max.0.01 | max.0.02 | max.0.05 | max.0.01 | max.0.01 | max.0.03 |
| S% | max.0.005 | max.0.02 | max.0.05 | max.0.02 | max.0.005 | max.0.02 | max.0.01 | |
| P% | max.0.02 | max.0.02 | max.0.02 | max.0.02 | max.0.02 | max.0.02 | ||
| Zn% | max.0.05 | max.0.50 | max.0.50 | max.0.50 | max.0.05 | max.0.20 | max.0.20 | |
| Other | max.0.20 | max.0.30 | max.0.20 | max.0.30 | max.0.40 | |||
| Cu% | rem. | rem. | rem. | rem. | +Ni+Fe+Mn min99.5 | rem. | rem. | rem. |
Why Choose CuNi 90/10 (C70600) for Seawater Piping Systems?
CuNi 90/10 (UNS C70600) copper nickel alloy is widely used in marine seawater piping systems, offshore engineering, and shipbuilding due to its excellent corrosion resistance, anti-fouling performance, and long service life in harsh seawater environments.
Excellent Seawater Corrosion Resistance
Designed for long-term exposure to seawater environments in marine and offshore piping systems, resisting pitting and general corrosion.
Anti-Biofouling Performance
Reduces marine organism adhesion, helping maintain stable flow efficiency in seawater systems.
Good Weldability and Fabrication
Suitable for welding, bending, and forming into elbows, tees, reducers, and flanges for complex piping layouts.
High Reliability in Offshore Applications
Proven performance in shipbuilding, desalination plants, and offshore platforms with stable long-term operation.
Long Service Life & Low Maintenance
Typically exceeding 20–25 years of service life, reducing maintenance frequency and lifecycle cost.
Suitable for Complex Marine Piping Systems
Can be manufactured into pipes, elbows, tees, reducers, flanges, and BSP threaded fittings for full system integration.
Request a Quote for CuNi 90/10 Pipe Fittings
Send us your drawings, material requirements, standards, dimensions and project quantity. We can supply standard and customized C70600 copper nickel pipe fittings for marine seawater piping systems.
Marine Copper Nickel Fittings Applications
Ship Seawater Cooling Systems
Copper nickel pipe fittings are widely used in marine seawater cooling circuits due to their outstanding resistance to seawater corrosion, biofouling and erosion.
Ballast Water Management Systems
CuNi 90/10 and CuNi 70/30 fittings help ensure long service life and reliable operation in ballast water treatment and distribution pipelines.
Marine Firefighting Networks
Copper nickel elbows, tees and flanges are commonly installed in marine fire main systems where corrosion resistance and safety are critical.
Desalination Plant Piping
Marine-grade copper nickel fittings perform exceptionally well in reverse osmosis and thermal desalination facilities handling seawater intake and discharge.
Offshore Oil & Gas Platforms
Offshore platforms utilize copper nickel piping components for seawater utility systems, cooling water lines and splash-zone environments.
Coastal Power Station Cooling Systems
Copper nickel fittings are widely specified for seawater cooling pipelines in coastal power plants because of their long-term durability and low maintenance requirements.
Quality Control and Inspection for CuNi 90/10 Pipe Fittings
To ensure reliable performance in marine seawater piping systems, every batch of CuNi 90/10 (C70600) copper nickel pipe fittings undergoes strict quality control throughout production and before shipment.
- EN 10204 3.1 Material Test Certificate (MTC)
- Chemical Composition Analysis
- Mechanical Property Testing
- Dimensional Inspection
- Visual Surface Examination
- Wall Thickness Verification
- Hydrostatic Pressure Testing
- Eddy Current Testing (ECT)
- Ultrasonic Testing (UT)
- Positive Material Identification (PMI)
- Final Pre-Shipment Inspection
Each production lot is fully traceable from raw material procurement to finished product delivery. Inspection records, material certificates, dimensional reports, and test results are maintained for quality assurance and project documentation.
Third-party inspections by SGS, BV, TUV, DNV, ABS, LR or customer-appointed inspectors can be arranged according to offshore, shipbuilding, desalination, and power plant project requirements.
All inspection procedures are performed in accordance with applicable ASTM, ASME, ISO and customer specifications to ensure compliance with international marine engineering standards.
CuNi 90/10 Copper Nickel Pipe Fittings Packaging and Delivery
- Small-size fittings are packed in cartons or fumigation-free wooden cases.
- Large elbows, tees and flanges are secured in export wooden crates or on pallets.
- Plastic end caps can be fitted to protect machined or beveled pipe ends.
- Each package is wrapped to reduce moisture exposure and handling damage during transit.
- Products can be marked according to item number, drawing number or project requirements.
- Suitable for sea freight, air freight and sample shipments by express courier.
CuNi 90/10 and CuNi 70/30 pipe fittings are packed for international transportation and marine project delivery. Export wooden cases, pallets and customized marking help ensure safe shipment and efficient identification for shipbuilding, offshore platform and seawater piping installations.
Why Choose Our CuNi 90/10 Pipe Fittings
We are a professional manufacturer of copper nickel piping systems, providing reliable solutions for marine, offshore and industrial applications. Our production is built on stable manufacturing capacity, strict quality control, and flexible OEM service for global engineering projects.
Engineering Application Focus
Our fittings are widely used in seawater cooling systems, ballast water treatment, desalination plants, offshore platforms and coastal power plants.
Reliable Manufacturing Partner
We support long-term supply cooperation with shipyards, EPC contractors and industrial distributors, ensuring stable quality and consistent delivery for global projects.
FAQ – CuNi 90/10 (C70600)
What is CuNi 90/10?
CuNi 90/10 is a copper nickel alloy containing approximately 90% copper and 10% nickel, widely used in marine seawater systems (UNS C70600).
Are CuNi 90/10 fittings suitable for seawater?
Yes, they are specifically designed for seawater corrosion resistance and marine applications such as shipbuilding and offshore platforms.
What standards do you follow?
ASTM B466, ASTM B111, DIN 86087 / 86088, EEMUA 234, ASME B16.5 and JIS standards.
Do you provide certificates?
Yes, EN 10204 3.1 MTC certificates are available for full traceability and project documentation.
What products are available?
We supply pipes, elbows, tees, reducers, flanges, BSP fittings and customized copper nickel components.