Cupro Nickel 70/30 Buttweld Fittings are made to Copper-nickel 70/30, UNS C71500 (made from ASTM B466 / B467 pipe) for high-velocity seawater service. Elbows, tees, reducers and caps are dimensioned to ASME B16.9 and bevelled for welding into Cupro Nickel 70/30 pipe.
Raaj Fittings manufactures Cupro Nickel 70/30 buttweld fittings in-house at our two plants in India, seamless and welded, from ½" upwards, 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 70/30, UNS C71500 (made from ASTM B466 / B467 pipe) |
|---|---|
| Construction | Seamless and welded |
| Dimensional standards | ASME B16.9, MSS SP-43; bevelled ends to ASME B16.25 |
| Size range | ½" to 48" NPS; larger sizes to order |
| Wall thickness | SCH 5S, 10S, 40S, 80S and heavier walls to order |
| Certification | EN 10204 3.1 mill test certificate as standard; EN 10204 3.2 on request |
Copper-nickel 70/30 (UNS C71500) contains about 30% nickel, giving it higher strength and better resistance to high flow velocities, polluted water and erosion than 90/10. It is used where seawater systems run faster or harder than 90/10 can tolerate.
| Element, % | C71500 |
|---|---|
| Nickel (Ni) | 29.0 – 33.0 |
| Iron (Fe) | 0.40 – 1.0 |
| 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 |
|---|---|---|---|
| C71500 | 2.0882 / CW354H | CuNi30Mn1Fe | — |
Copper-nickel fittings are made from seamless or welded copper-nickel pipe and welded with matching copper-nickel filler. Design flow velocities should stay within the limits for the alloy to avoid erosion at elbows and tees.
Every heat is PMI-verified and its chemistry and mechanical properties are confirmed against the material specification before the buttweld fittings 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.
Choose 70/30 for higher seawater velocities, polluted or aggressive water and where better erosion resistance is needed, for example in condensers and naval seawater systems.
Copper-nickel is normally joined to steel through flanges with suitable gasket and insulation arrangements rather than by direct welding.
Yes. Smaller sizes are normally seamless and larger sizes welded, with weld examination as the specification and your order require. Tell us the size, schedule and any construction requirement.
Every order is supplied with EN 10204 3.1 mill test certificates showing heat chemistry and mechanical properties to Copper-nickel 70/30, UNS C71500 (made from ASTM B466 / B467 pipe). EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.