Copper Nickel 90 10 Flanges
HC Aluminum provides 90/10 copper nickel flanges for corrosion-resistant seawater piping systems. Standard dimensions, Navy flange patterns, custom bores, special drilling and drawing-based machining are available according to project requirements.
HC Aluminum manufactures copper nickel 90 10 flanges in UNS C70600, CuNi10Fe1Mn and CW352H material grades for marine vessels, offshore platforms, desalination plants and seawater cooling systems.
Our product range includes 90/10 copper nickel slip-on, weld neck, blind, socket weld, threaded, lap joint and Navy-pattern flanges in commercial and project-specific pressure classes.
- UNS C70600 / CW352H / CuNi10Fe1Mn materials
- Class 150, 200, 250, 300, 400, 600 and 700
- 100% NDT Tested
- EN 10204 3.1 MTC and heat number traceability
- PMI, PT, UT, RT and pressure testing available
90/10 Copper Nickel Flange Specifications
Size Range
1/2″ (DN15) up to 36″ (DN900) – Custom larger sizes available upon request.
Commercial Pressure Ratings
Class 150, 300, 600, 900, 1500, 2500.
Navy Pressure Ratings
Class 150, Class 250, Class 400, Class 700.
Execution Standards
ASME/ANSI B16.5, DIN, EN 1092-1, MIL-F-20042 (Navy).
What Are Copper Nickel 90 10 Flanges?
A copper nickel 90 10 flange, also called a Cu-Ni 90/10 flange, is a piping connection component manufactured from copper-nickel alloy containing approximately 90% copper and 10% nickel. The material is commonly supplied as UNS C70600 flanges in ASTM and ASME-related projects, while CW352H flanges or CuNi10Fe1Mn may be specified for EN-based applications.
Compared with ordinary carbon steel flange materials, 90/10 copper-nickel develops a protective surface film during seawater service. This film contributes to its well-known resistance to seawater corrosion, erosion-corrosion and marine biofouling under properly designed and commissioned operating conditions.
HC Aluminum manufactures and supplies copper nickel flanges from forged material, plate-machined material or customer-approved raw material forms, depending on the required size, pressure rating, flange design and applicable standard. For a complete piping package, customers may also source matching 90/10 copper nickel pipes and copper nickel fittings.
Why Choose 90/10 Copper Nickel Flanges for Seawater Systems?
90/10 copper nickel is an established material for saltwater piping and cooling-water systems. It is widely used where long service life, corrosion control and stable performance are required in contact with natural seawater, brackish water or marine atmospheres.
Seawater Corrosion Resistance
Cu-Ni 90/10 provides reliable corrosion resistance in natural seawater and many saline-water operating conditions.
Erosion-Corrosion Performance
The alloy is suitable for flowing water systems where turbulent flow and suspended solids may damage less resistant materials.
Marine System Compatibility
It is commonly selected for shipboard seawater lines, cooling circuits, fire main systems and offshore utility piping.
Good Fabrication Properties
90/10 copper nickel offers good weldability and practical machinability for flange, pipe spool and fitting fabrication.
- Excellent resistance to natural seawater corrosion
- Good resistance to erosion-corrosion in flowing water
- Useful resistance to marine biofouling under correct service conditions
- Reliable weldability for marine pipe spool fabrication
- Long-term value for shipbuilding, offshore and desalination projects
- Applicable to low- and medium-pressure seawater piping systems
Chemical Composition of UNS C70600 / CW352H
| 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. |
Copper Nickel 90/10 Flanges Fabrication Properties
During fabrication, Copper Nickel 90/10 maintains stable mechanical properties and can be processed through various welding, brazing and forming methods. Proper fabrication techniques help ensure long service life, leak resistance and structural reliability in demanding environments.
Joining and Fabrication Characteristics of CuNi 90/10 Flanges
| Fabrication Method | Suitability | Application Notes |
| Soldering | Excellent | Provides reliable joints for low-pressure piping and auxiliary systems. |
| Brazing | Excellent | Suitable for producing strong and corrosion-resistant connections. |
| Oxyacetylene Welding | Fair | Possible for specific applications, but requires controlled heat input. |
| Gas Shielded Arc Welding | Excellent | Preferred welding method for CuNi 90/10 flanges due to good weld quality and productivity. |
| Coated Metal Arc Welding | Good | Can be used for repair work and field fabrication applications. |
| Spot Welding | Good | Suitable for selected fabrication requirements. |
| Seam Welding | Good | Provides continuous joints for specific manufacturing processes. |
| Butt Welding | Excellent | Commonly used for joining CuNi piping components and flanges. |
Forming and Machining Performance
| Property | Performance Rating |
| Cold Working Capacity | Good |
| Hot Forming Capacity | Good |
| Machinability Rating | 20 |
Types of Copper Nickel 90 10 Flanges We Manufacture
HC Aluminum produces a broad selection of copper nickel 90 10 flanges for standard commercial piping, offshore equipment and Navy-style marine systems.
Slip-On Flanges
Slip-on flanges slide over the pipe and are welded at the hub and/or flange face. They are often used in lower-pressure or general marine piping systems where installation convenience is a key consideration.
- Class 150 commercial slip-on flanges
- Class 300 commercial slip-on flanges
- Class 150 commercial lightweight slip-on flanges
- Class 150 Navy slip-on flanges
- Class 250 Navy slip-on flanges
- Class 700 Navy slip-on / blind flanges
- Hub-type and plate-type Navy slip-on flanges
Weld Neck Flanges
Weld neck flanges incorporate a tapered hub and are butt-welded to the pipe end. They are normally preferred for high-pressure, cyclic, vibration-sensitive or higher-stress piping systems because the hub provides a smoother transition from the flange to the pipe wall.
- Class 150 commercial weld neck flanges
- Class 300 commercial weld neck flanges
- Class 600 commercial weld neck flanges
- Class 150 Navy weld neck flanges
- Class 250 Navy weld neck flanges
Socket Weld Flanges
Socket weld flanges have a recessed socket where the pipe is inserted before fillet welding. This connection is commonly used for smaller-bore piping where compact construction and a strong connection are required.
- Class 150 / Class 200 Schedule 40 commercial socket weld flanges
- Class 150 Navy socket weld plate flanges
- Class 250 Navy socket weld flanges
- Class 300 commercial socket weld flanges
- Class 400 Navy socket weld flanges
- Class 200 socket weld butterfly flanges
Blind Flanges
Blind flanges are used to close the end of a pipeline, vessel nozzle or branch connection. They provide access points for future maintenance, inspection, cleaning or system expansion.
- Class 150 commercial blind flanges
- Class 300 commercial blind flanges
- Class 150 Navy blind flanges
- Class 250 Navy blind flanges
- Class 700 Navy slip-on / blind designs
Threaded Flanges
Threaded flanges connect to threaded pipe without a butt weld. They may be chosen for specific low-pressure services or locations where welding is restricted.
- Class 150 commercial threaded flanges
- Class 300 threaded flanges
Special and Custom Cu-Ni 90/10 Flanges
In addition to standard ASME-style flanges, HC Aluminum can supply custom Cu-Ni 90/10 flange solutions based on drawings, samples, customer specifications, Navy standards or project requirements.
- Cu-Ni Inner Flanges (Stub End)
- Cu-Ni Slip On Stub End Flanges
- Steel & Cu-Ni Composite Blind Flanges
- Steel Outer Flanges
- Steel Backing Flanges
Where Are Copper Nickel 90 10 Flanges Used?
Marine and Navy Ship Piping
- Seawater cooling lines
- Fire main systems
- Ballast piping
- Bilge and drainage systems
- Condenser cooling circuits
- Auxiliary seawater services
- Naval vessel piping upgrades
Offshore Oil and Gas Platforms
- Seawater lift lines
- Offshore cooling-water systems
- Firewater lines
- Utility water piping
- Platform seawater treatment systems
Desalination Plants
- Seawater intake systems
- Cooling-water circuits
- Brine handling systems
- Pump station piping
- Heat-exchanger connections
Seawater Cooling Lines
- Heat exchangers
- Condensers
- Chillers
- Cooling skids
- Marine engines
- Seawater pumps
- Filtration and treatment equipment
Quality Control and Inspection Documentation for CuNi 90/10 Flanges
Available Quality Documents for CuNi 90/10 Flanges
- Mill Test Certificate (MTC)
- EN 10204 3.1 inspection certificate
- Chemical composition analysis report
- Mechanical property test report
- Heat number and production traceability records
- Dimensional inspection report
- Visual inspection report
- Positive Material Identification (PMI) report
- Dye penetrant testing (PT) report
- Ultrasonic testing (UT) report when applicable
- Radiographic testing (RT) report for specified welded fabrications
- Hydrostatic pressure test report for applicable assemblies
- Third-party inspection and release documentation
- Packing list, certificate of origin and export shipping documents
Marking, Packing and Full Traceability of CuNi 90/10 Flanges
- Manufacturer identification and product marking
- Material designation: UNS C70600, CuNi 90/10 or CW352H
- Heat number for material traceability
- Nominal pipe size and flange dimensions
- Pressure rating or Navy specification requirement
- Applicable flange standard, drawing number or project reference
- Production batch or lot identification
- Customer part number or special identification when required
Export packaging is selected based on flange size, quantity, destination and transportation requirements. Available packing solutions include reinforced plywood cases, wooden pallets, heavy-duty cartons and customized project packaging for marine and offshore applications.
Complete traceability documents, including material certificates (MTC), inspection reports and production records, can be provided to support quality control requirements for shipyards, EPC contractors and industrial projects.
Why Source Cu-Ni 90/10 Flanges from HC Aluminum?
- Standard and custom copper nickel 90/10 flange manufacturing
- Commercial and Navy flange configurations
- UNS C70600, CW352H and CuNi10Fe1Mn material options
- Slip-on, weld neck, blind, socket weld, threaded and lap joint flange designs
- Class 150 through Class 700 pressure ratings
- Drawing-based machining, special bores and custom bolt-hole patterns
- MTC and EN 10204 3.1 documentation
- PMI, NDT and third-party inspection coordination
- Export packing suitable for marine and international projects
For related corrosion-resistant piping materials, please visit our copper nickel pipe products and copper nickel fittings.
Request a Quote for Copper Nickel 90 10 Flanges
Send HC Aluminum your technical requirement for a fast and accurate quotation. We can review standard ASME flanges, Navy flanges, drawing-based components and project-specific Cu-Ni 90/10 flange requirements.
- Flange type: slip-on, weld neck, blind, socket weld, threaded, lap joint or custom
- Material grade: UNS C70600, CW352H, CuNi10Fe1Mn or specified equivalent
- Nominal pipe size and pipe schedule
- Pressure class or Navy rating
- Flange facing type and drilling requirement
- Applicable standard, drawing number or part number
- Required quantity
- MTC, EN 10204 3.1, PMI, NDT or third-party inspection requirements
- Delivery location and requested delivery date
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