A copper nickel threaded flange is a pipe connection component made by precision forging or machining copper nickel alloy, with standard pipe threads such as NPT or G threads machined inside the flange bore.
Copper nickel threaded flanges are specially designed for copper nickel pipes with external threads. They are easy to install and require no welding. The Shihang copper nickel threaded flange can be assembled simply by slowly threading it onto the copper nickel pipe or flange. It retains the advantages of flange connections, such as easy disassembly and strong pressure-bearing capacity, while eliminating the complicated process of large-scale welding.
Copper nickel alloy is an important category of copper-based corrosion-resistant materials. The most common grades are 90/10 (Cu 90%, Ni 10%) and 70/30 (Cu 70%, Ni 30%).
Copper nickel slip-on flanges are most commonly used in electrical and electronic products, condenser piping in ships and power plants, and various marine products, including valves, pumps, pipe fittings, and hull sheathing.
Product Technical Parameters
| Material | Copper Nickel 90/10 flange, C70600, C71500 |
| Nominal Diameter | DN10 – DN300 |
| Size | 1/2″ (15 NB) to 48″ (1200 NB), DN10–DN5000 |
| Pressure Rating | Class 150 / 300 / PN10 – PN40 |
| Connection Type | BSP / NPT / Metric Thread |
| Surface Treatment | Polished / Anti-corrosion coating / Original finish |
| Working Temperature | -50℃ to +250℃ |
| Connection Type / Flange Facing Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Small Male-Female (SMF) |
| Standards | ANSI flange, ASME flange, BS flange, DIN flange, EN flange, etc. |
ASTM B151 Cupro Nickel 90/10 Threaded Flange Chemical Composition
| Grade | Cu | Mn | Pb | Ni | Fe | Zn |
| Cu-Ni 90-10 | 88.6 min | 1.0 max | 0.05 max | 9-11 | 1.8 max | 1 max |
90/10 Cupro Nickel Threaded Flange Mechanical Properties
| Material | Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
| Copper Nickel 90-10 | 0.323 lb/in³ at 68°F | 2260°F | 50,000 psi | 20,000 psi | 30% |
Core Product Advantages
1. Excellent Resistance to Seawater and Erosion Corrosion
When copper nickel alloy comes into contact with seawater, a dense and strong protective film, mainly composed of cuprous oxide, quickly forms on the surface. This film not only resists chloride ion corrosion but also remains stable under high-velocity seawater flow up to 3–4 m/s, effectively preventing pitting and crevice corrosion.
2. Natural Anti-fouling Capability
Due to the slow release of copper ions, the surface of copper nickel flanges has natural antibacterial and anti-marine fouling properties. In pipelines immersed in seawater for long periods, it helps prevent marine organism buildup, keeps pipelines unobstructed, and reduces maintenance costs.
3. Convenient Flame-free Threaded Connection
Compared with traditional welding neck flanges, threaded flanges do not require on-site welding. This feature provides unmatched installation safety and convenience in areas where open flames are prohibited, such as certain zones of oil and gas platforms, confined cabin spaces, or working conditions where post-weld heat treatment cannot be performed.
4. Excellent Low-temperature Toughness and Vibration Resistance
Copper nickel alloy has a face-centered cubic crystal structure and does not undergo brittle transition even at extremely low temperatures. It also has good ductility and fatigue resistance, allowing it to effectively absorb pipeline vibration and impact caused by ship navigation or mechanical operation.
5. Low Installation Cost
Since no welding is required, copper nickel threaded flanges reduce the need for welding equipment, welding consumables, certified welders, and on-site fire prevention measures. They are especially suitable for quick on-site installation, maintenance, and replacement.
Structure and Types of Copper Nickel Threaded Flanges
Copper nickel threaded flanges usually include the following structural types:
1. Female Threaded Flange
Used for connection with externally threaded pipe fittings. It is easy to install and suitable for low-pressure or medium-pressure systems.
2. Male Threaded Flange
Used together with internally threaded pipe fittings. It is commonly applied at equipment outlets or valve connections.
3. Flat Sealing Structure
Sealing is achieved through a gasket to ensure leak-free operation in seawater or oil and gas media.
What Is the Difference Between Copper Nickel Alloy Threaded Flanges and Slip-on Flanges?
Copper nickel alloy threaded flanges and copper nickel alloy slip-on flanges are similar in almost all aspects.
The main difference is that copper nickel alloy threaded flanges have threads inside the bore, while copper nickel alloy slip-on flanges do not.
Applications of C70600 Copper Nickel Threaded Flanges
1. Shipbuilding and Offshore Engineering
Used in critical pipeline connections such as seawater cooling systems, ballast water systems, and fire-fighting pipelines.
2. Seawater Desalination Systems
Ensures long-term stable operation in high-salt and high-humidity environments.
3. Oil and Gas Platforms
Suitable for offshore drilling platforms and pipelines transporting corrosive media.
4. Chemical and Industrial Pipelines
Used in systems transporting chloride-containing or mildly corrosive media.
5. Heat Exchange Equipment
Widely used in connection parts of condensers and heat exchange systems.
Are Copper Nickel Alloy Threaded Flanges Available in Flat Face and Raised Face Types?
Yes. Copper nickel alloy threaded flanges, also known as CuNi threaded flanges, are commonly available with two sealing face types: Flat Face (FF) and Raised Face (RF).
1. Flat Face Flange, FF
The sealing surface is a complete flat structure with uniform stress distribution and is usually used with a full-face gasket.
It is suitable for low-pressure piping systems or systems with moderate sealing requirements, commonly used in some seawater or auxiliary pipelines.
2. Raised Face Flange, RF
The sealing surface is slightly raised above the flange base surface. It creates a higher sealing pressure through a smaller contact area, providing stronger sealing performance.
It is suitable for medium- and high-pressure working conditions, such as marine seawater systems, offshore equipment, and industrial transmission pipelines.
Users can choose according to their specific requirements.
Quality Standards for Copper Nickel Threaded Flanges
American Standards: ASME B16.5, MSS SP-44, Class 150, Class 300, Class 600
German / European Standards: EN 1092-1, DIN 86037 / DIN 86036, PN6, PN10, PN16, PN40
Classification Society Standards: JIS international standards and customized standards from various classification societies are available.
Stock Supply of 90/10 Copper Nickel Threaded Flanges
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