90/10 Copper Nickel Pipe (C70600) – Complete Technical Guide

C70600 is a 90/10 copper nickel alloy (90% copper, 10% nickel) with small amounts of iron and manganese. GNEE manufactures this alloy in pipe, tube, condenser tube, heat exchanger tube, U-bend, and coiled forms.

Why choose C70600:

High corrosion resistance in seawater

Natural anti-biofouling properties

Good weldability and formability

Retention of mechanical properties at cryogenic temperatures

1. What is the difference between C70600 and C71500?
C71500 has 30% nickel and is stronger than C70600 (10% nickel). C70600 tensile strength is 38-60 KSI, while C71500 is 52-75 KSI. C70600 is more affordable and easier to weld. C71500 is for higher pressure and more aggressive seawater conditions.

2. What are the equivalent standards for C70600?
C70600 equivalents include ASTM B111, ASME SB111, BS 2871 CN102, EN 12451 CuNi10Fe1Mn, and JIS H3300 C7060. These are all the same 90/10 copper-nickel alloy under different national standards. GNEE can supply with any of these certifications.

3. Can C70600 be welded?
Yes, C70600 has excellent weldability. TIG and MIG welding are the preferred methods. Brazing and butt welding are also excellent. No preheating is required for wall thickness under 1 inch.

4. Is C70600 suitable for seawater?
Yes, C70600 is specifically designed for seawater applications. It forms a stable protective film that resists pitting and crevice corrosion. It also releases copper ions that prevent marine organism attachment.

5. What is the maximum operating temperature for C70600?
C70600 can operate continuously at up to 300°C (572°F). Above this temperature, strength drops significantly. For applications above 300°C, consider C71500 which handles up to 350°C.

6. Does C70600 require heat treatment after welding?
Generally no, post-weld heat treatment is not required. The soft annealed temper is suitable for most welded applications. Stress relief may be considered for heavy sections or critical service.

7. What is C70600 used for?
C70600 is used for condenser tubes, heat exchangers, seawater piping, and desalination plants. Specific applications include power plant cooling systems, shipboard seawater lines, offshore firewater systems, and hydraulic lines.

8. What sizes does GNEE supply for C70600?
GNEE supplies C70600 from 1/4" to 4-1/4" OD (8mm to 108mm). Wall thickness ranges from 0.8mm to 3.0mm with tolerance of ±0.030mm. Standard lengths are as per condenser and heat exchanger design requirements.

9. What is the lead time for C70600 from GNEE?
Standard lead time is within 30 days after receiving deposit. Custom sizes and tempers may require additional time. Rush orders can be discussed based on current inventory.

10. What payment terms does GNEE accept?
GNEE accepts L/C (Letter of Credit) and T/T (Telegraphic Transfer). Other payment terms can be discussed for large or repeat orders. Contact GNEE for specific terms based on your location and order size.

11. How does C70600 resist biofouling?
Copper ions released from the tube surface prevent marine growth. Unlike stainless steel or titanium, C70600 actively discourages barnacles, algae, and mussels from attaching. This reduces maintenance and keeps heat transfer efficiency high.

12. Is C70600 magnetic?
No, C70600 is non-magnetic. Neither copper (90%) nor nickel (10%) in this alloy creates magnetic properties. This makes it suitable for use near sensitive electronic equipment such as naval sonar and magnetic compasses.

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