C70600 Copper-Nickel Tube - 90/10 Cupronickel Tubing

C70600 copper-nickel tube is a high-performance metal material mainly composed of copper and nickel, with copper content of approximately 88% to 91% and nickel content of approximately 9% to 11%. It also contains small amounts of iron, phosphorus, and zinc.

GNEE supplies C70600 copper-nickel tube for manufacturing piping systems, condenser tubes, evaporators, heat exchangers, and various high-strength corrosion-resistant parts. This alloy is widely used in shipbuilding, chemical industry, energy engineering, and ocean engineering.

Key advantages include excellent mechanical properties, outstanding corrosion resistance, and strong impact resistance. C70600 is particularly suitable for replacing aluminum brass in marine condenser tubes, especially at high water velocities.

In nuclear and thermal power generation, C70600 copper-nickel tubes face competition from titanium tubes and stainless steel tubes. However, in shipbuilding, seawater desalination, and ocean engineering, C70600 copper-nickel tubes maintain huge application potential and remain irreplaceable.

1. What is the difference between C70600 and C71500?
C71500 has higher strength and better seawater corrosion resistance than C70600. C70600 contains 90% copper and 10% nickel, while C71500 contains 70% copper and 30% nickel. The higher nickel content in C71500 makes it stronger and more resistant to aggressive seawater, but C70600 is more affordable and easier to weld.

2. What is the equivalent of C70600?
C70600 equivalents are ASTM B466, DIN 2.0872, BS 2871 CN102, and EN CW352H. These are the same 90/10 copper-nickel alloy under different standards. ASTM B466 is the most common US standard, DIN 2.0872 is German, BS 2871 CN102 is British, and EN CW352H is European.

3. Can C70600 be welded to stainless steel?
No, direct welding is not recommended. Welding C70600 to stainless steel requires a nickel-based filler metal like ERNiCu-7. Direct welding creates a galvanic couple that leads to rapid corrosion, especially in seawater or wet environments. Use a transition piece or flanged connection with isolation.

4. Is C70600 suitable for seawater?
Yes, C70600 is specifically designed for seawater applications. It forms a stable protective film in seawater that resists pitting, crevice corrosion, and biofouling. This is why C70600 is the standard choice for marine cooling systems, desalination plants, and offshore platforms.

5. What is the maximum temperature for C70600?
C70600 can handle up to 315°C (600°F) continuously. Above this temperature, the alloy loses strength and becomes prone to oxidation. For applications above 315°C, consider C71500 or a nickel-based alloy.

6. Does C70600 rust?
No, C70600 does not rust. Rust only occurs on iron and steel. C70600 is a copper-nickel alloy that forms a protective patina instead of rust. This patina actually protects the underlying metal from further corrosion.

7. What is C70600 used for?
C70600 is used for condenser tubes, heat exchanger tubes, seawater piping, and desalination plants. Specific applications include power plant condensers, shipboard cooling systems, offshore platform piping, and evaporator tubes in desalination facilities.

8. Is C70600 magnetic?
No, C70600 is non-magnetic. Neither copper nor nickel in this alloy composition creates magnetic properties. This makes C70600 suitable for applications where magnetic interference must be avoided, such as near sensitive electronic equipment.

9. How to weld C70600?
Use TIG or MIG welding with ERCuNi filler metal. No preheating is needed for wall thickness under 1 inch. Use argon shielding gas for TIG or argon-helium mix for MIG. Clean the weld area thoroughly before welding and avoid overheating.

10. What sizes does C70600 come in?
C70600 is available from 6mm to 630mm OD with wall thickness from 0.3mm to 30mm. Standard lengths are 3m, 5.8m, 6m, and 12m. Custom sizes and U-bend tubes are also available upon request from GNEE.

Request Free Sample Now