Cupro Nickel 90/10 Flanges are made to Copper-nickel 90/10, UNS C70600 for marine seawater piping. They are supplied in every common flange type and facing to ASME B16.5, B16.47 and the main EN, DIN, BS and JIS standards.
Raaj Fittings manufactures Cupro Nickel 90/10 flanges in-house at our two plants in India, from ½" to 60" and in Class 150 to Class 2500, and exports them to EPC contractors, fabricators and stockists across the Middle East, Europe and the Americas, with full traceability and EN 10204 certificates.
| Material specification | Copper-nickel 90/10, UNS C70600 |
|---|---|
| Dimensional standards | ASME B16.5 (½" to 24"), ASME B16.47 Series A and B (26" to 60"), EN 1092-1, DIN, BS 4504, JIS B2220 |
| Pressure class | ASME Class 150, 300, 600, 900, 1500 and 2500; PN 6 to PN 400 |
| Facing | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| Certification | EN 10204 3.1 mill test certificate as standard; EN 10204 3.2 on request |
Copper-nickel 90/10 (UNS C70600) is a copper alloy with 10% nickel and small additions of iron and manganese. It forms a thin protective film in seawater that resists corrosion and, unusually, discourages marine growth, which is why it is the classic material for seawater piping on ships and offshore installations.
| Element, % | C70600 |
|---|---|
| Nickel (Ni) | 9.0 – 11.0 |
| Iron (Fe) | 1.0 – 1.8 |
| Manganese (Mn) | 1.0 max |
| Lead (Pb) | 0.05 max |
| Zinc (Zn) | 1.0 max |
| Copper (Cu) | Remainder |
Mechanical properties depend on product form and temper and are reported on the mill test certificate.
| UNS | Werkstoff Nr. | EN / DIN | Other |
|---|---|---|---|
| C70600 | 2.0872 / CW352H | CuNi10Fe1Mn | — |
Copper-nickel flanges are commonly supplied as weld neck, slip on and blind flanges, or as backing flanges with copper-nickel collars. Where they meet steel, insulating gasket kits prevent galvanic corrosion.
Every heat is PMI-verified and its chemistry and mechanical properties are confirmed against the material specification before the flanges are released. Each piece is marked with grade, size, rating and heat number for traceability to its EN 10204 3.1 mill test certificate. EN 10204 3.2 certification and inspection by the buyer's nominated third-party agency are available on request, as are PED 2014/68/EU compliance for European projects and IBR certification for Indian boiler applications.
It resists seawater corrosion and biofouling, so pipes stay clean and sound for many years, which is why it is widely used in ship and offshore seawater systems.
70/30 has about 30% nickel and resists higher flow velocities and more aggressive conditions; 90/10 is more economical and is the most widely used for general seawater piping.
We make Cupro Nickel 90/10 Flanges from ½" to 24" to ASME B16.5 and from 26" to 60" to ASME B16.47 Series A and B, in Class 150 to 2500, and to EN 1092-1, DIN, BS and JIS standards in PN ratings.
Every order is supplied with EN 10204 3.1 mill test certificates showing heat chemistry and mechanical properties to Copper-nickel 90/10, UNS C70600. EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.