Copper-nickel flanges are typically made from an alloy that contains copper as the primary element, with a significant percentage of nickel and sometimes other elements like iron and manganese. Common compositions include 90-10 (90% copper, 10% nickel) or 70-30 (70% copper, 30% nickel). These alloys offer excellent resistance to corrosion, erosion, and biofouling in seawater environments.
One of the main advantages of copper-nickel flanges is their exceptional resistance to various forms of corrosion, including seawater corrosion, crevice corrosion, and stress corrosion cracking. This property makes them highly suitable for marine applications, such as shipbuilding, offshore oil and gas platforms, and desalination plants.
Copper-nickel alloys possess good mechanical strength, making them suitable for use in high-pressure and high-temperature environments. They are also known for their durability and longevity, contributing to the overall reliability of the piping system.
Copper-nickel flanges come in various types based on their connection methods and applications, such as weld neck flanges, slip-on flanges, socket weld flanges, blind flanges, and threaded flanges. Each type serves a specific purpose in piping systems, offering ease of installation, secure connections, or closure.
These flanges find widespread application in industries requiring resistance to corrosion and erosion. Typical applications include seawater piping systems, heat exchangers, power plants, chemical processing plants, and various marine-related equipment.
While copper-nickel alloys are highly resistant to corrosion, proper maintenance, including regular cleaning and inspection, can help ensure their long-term performance and reliability in service.
Copper Nickel Alloy Socket Weld Flanges and Copper Nickel Alloy Threaded Flanges designed by us traces its usage in the making of Pump Impellers for oil refining and valve bodies. Based on the precise requirements of our customers, we manufacture all of our Copper Nickel Flanges in varying sizes and dimensions, one such being Copper Nickel Alloy Lap Joint Flanges.
Copper Nickel Alloy Spectacle Blind and Copper Nickel Alloy Reducing Flanges are made adding a tinge of chromium and molybdenum. Addition of Aluminium advances the hot and cold workability of Copper Nickel Alloy Forged Flanges.
| Specifications | ASTM B151 / ASME SB151 |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Grades |
Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640 |
| Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Size | 1/2″NB TO 60″NB |
| Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Flange Face Type | Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| COPPER NICKEL FLANGES | MATERIAL | EEMUA | DIN | ANSI |
| COMPOSITE WELD NECK INNER FLANGES | CuNi | 145 | DIN 86037 | |
| COMPOSITE WELD NECK BACKING FLANGES | Carbon steel | 145 | DIN 86037 | |
| COMPOSITE SLIP ON INNER FLANGES | CuNi | 145 | DIN 86036 | |
| COMPOSITE SLIP ON BACKING FLANGES | Carbon steel | 145 | DIN 86036 | |
| SOLID WELD NECK | CuNi | 145 | DIN 2632/2633 | B 16-5 |
| SOLID SLIP ON | CuNi | 145 | DIN 86033 | B 16-5 |
| SOLID BLIND | CuNi | B 16-5 | ||
| SOLID SOCKET WELDING | CuNi | B 16-5 | ||
| THREADED WELDING | CuNi | B 16-5 |
DIN standard flanges are most common standard in shipbuilding.
There are four main standards as below:
ASME B16.5 standard C70600 flanges are mainly used on the oil field.
There are five main flange type as below:
| Values | Units | CuNi 90/10 | CuNi 70/30 |
| Density (20°C) | kg/m3 | 8900 | 8900 |
| Electrical Resistivity (20°C annealed) | μΩ.cm | 19 | 34 |
| Thermal Conductivity (20°C to 200°C) | W/m.°K | 50 | 30 |
| Coefficient of Expansion (20°C to 200°C) | C x 10-6 | 17 | 16 |
| Modulus of Elasticity (20°C annealed) | Mpa | 126 000 | 126 000 |
| Annealing Temperature | °C | 760 – 800 | 760 820 |
| Melting Interval | °C | 1100 – 1150 | 1180 1240 |
| Magnetic Permeability (20°C annealed) | 1.08 – 1.80 | < 1.05 |
| Typical Values | Units | CuNi 90/10 | CuNi 70/30 |
| Tensile Strength (UTS),(Rm) | MPa | > 310 | > 350 |
| ksi | > 44 | > 51 | |
| Proof Stress (YS 0,2), (Rp 0,2) | MPa | > 110 | > 130 |
| ksi | > 16 | > 19 | |
| Elongation (E 5,65 VS) | % | > 35 | > 30 |
| Hardness (HB10 D2 ) | > 70 | > 80 |
The applications of copper-nickel flanges are widely found among different industries. They are used in
However, other industries where such flanges are widely used are seawater projects, armament industry, hulls of ships and boats.
