70/30 CuNi Copper Nickel Elbow 90/45 Degree Butt Welding Pipe Fittings Corrosion Resistant

70/30 CuNi Copper Nickel Elbow 90/45 Degree Butt Welding Pipe Fittings Corrosion Resistant

1.Product Description

The Copper Nickel Elbow is a pressure-pipe directional fitting manufactured from the copper-nickel binary alloy system, primarily in grades UNS C70600 (CuNi90/10) and UNS C71500 (CuNi70/30). By precisely controlling nickel content (10% or 30%) and micro‑additions of iron and manganese, the product achieves outstanding resistance to localized corrosion in chloride‑rich environments.

Manufacturing routes include seamless forming (extrusion or push‑forming, producing a weld‑free bend) and welded construction (plate‑formed and seam‑welded, typically for larger diameters). The elbow radius is classified as Long Radius (1.5× nominal diameter) or Short Radius (1.0× nominal diameter). Standard bend angles are 45°, 90°, and 180°, with custom angles available per engineering drawings.

End connection types include Butt‑Weld (BW, bevelled), Socket‑Weld (SW), and female threads (NPT/BSP). All manufacturing and inspection comply with ASME B16.9, EN 10253, DIN 86090, and EEMUA 146, ensuring dimensional interchangeability and full traceability.

2.Product Applications

Copper Nickel Elbows are specified for severe service conditions demanding high corrosion resistance and extended service life. Typical applications include:

• Ships & Offshore Platforms: Seawater cooling mains, firewater systems, ballast water treatment lines, deck wash, and subsea riser turn‑downs.

• Oil & Gas Industry: Offshore production manifolds, FPSO topside process piping, and gathering lines with H₂S/CO₂ content.

• Power Generation: Nuclear island circulating water systems, coal‑fired plant FGD wastewater lines, and combined‑cycle plant closed‑cooling loops.

• Desalination Plants: Brine recirculation lines in MSF and MED units, as well as RO pre‑filtration piping.

• Chemical & Pharmaceutical: Chlor‑alkali brine lines, purified water distribution systems, and corrosive chemical transfer.

• Urban Infrastructure: Large‑scale HVAC chilled water systems, district cooling/heating networks, and swimming pool water recirculation.

3.Product Advantages

1. Extreme Resistance to Flowing Seawater
At velocities ≤3.5 m/s, the uniform corrosion rate of C70600 is ≤0.025 mm/year, while C71500 achieves ≤0.018 mm/year – significantly superior to 316L stainless steel (~0.1 mm/year) and super duplex grades. Pitting Resistance Equivalent Number (PREN) reaches 35–40, with outstanding crevice corrosion resistance.

2. Self‑Cleaning Anti‑Biofouling
Copper ions release a micro‑toxic layer on the surface, inhibiting barnacles, mussels, and algae attachment. This is more environmentally friendly than antifouling paints and eliminates routine cleaning, saving operation and maintenance labour.

3. Excellent Fabrication and Weldability
The formed elbow has a dense structure with no susceptibility to intergranular corrosion. When welded to same‑grade piping using SMAW, TIG or MIG, preheating and post‑weld heat treatment are generally unnecessary. Weld corrosion resistance, verified per ASTM G48, is equivalent to the base metal.

4. Broad Pressure‑Temperature Range
Permissible operating temperatures range from -30°C to 320°C. At 200°C, C70600 (Sch 40) has a maximum allowable working pressure of 21 bar, while C71500 (Sch 80) reaches 48 bar under the same conditions, covering most medium‑to‑high pressure systems.

5. Outstanding Life‑Cycle Economics
Although initial cost exceeds carbon steel, service life of 20‑30 years (versus 3‑5 years for carbon steel) and lower maintenance requirements result in total lifecycle costs that are 60‑70% of coated carbon steel systems.

6. Flexible Supply and Full Certification
Available from DN15 to DN700 in all standard schedules, plus special wall thicknesses or non‑standard centre‑to‑end dimensions. Products are supplied with EN 10204 3.1 material certificates and type‑approval certificates from major classification societies (DNV, BV, ABS, LR), facilitating international project acceptance.

​4.Key Product Specifications

FAQ

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