If you put a C11000 copper tube in a seawater heat exchanger, it will fail rapidly. The combination of salt, high velocity, and bio-fouling eats pure copper alive through a process called "Erosion-Corrosion."
Enter C70600 (Copper Nickel 90/10). This is the maritime industry standard for a reason.
Why Copper Nickel?
C70600 contains 10% Nickel and roughly 1.4% Iron.
The Iron Factor: The small addition of iron is critical. It helps form a tenacious, self-healing protective film on the tube surface that resists turbulent water.
Bio-Fouling: Like pure copper, C70600 resists the growth of barnacles and algae, keeping pipes clean without chemicals.
Performance Limits
Seawater Velocity Limits
| Material | Max Safe Flow Velocity | Risk |
| C11000 (Pure Copper) | < 0.9 m/s | Rapid erosion & pitting |
| C70600 (CuNi 90/10) | 3.5 m/s | Excellent resistance |
| C71500 (CuNi 70/30) | 4.5 m/s | Superior (for subs/carriers) |
Application Scenarios
Shipbuilding: Seawater cooling loops, fire-fighting systems.
Desalination Plants: Brine heaters.
Power Plants: Coastal condenser tubes.
Don't use C11000 here. Even if C11000 is cheaper upfront, the maintenance cost of replacing corroded tubes will bankrupt the project.
International Standards
| Region | Standard | Grade Designation |
| USA | ASTM B111 / B466 | C70600 |
| Europe | EN | CW352H / CuNi10Fe1Mn |
| Japan | JIS | C7060 |
Product Forms We Can Provide
| Product Category | Material Standards | Common Alloys | Key Specifications (Can be Customized) |
|---|---|---|---|
| Copper Tubes | ASTM B75, B88, B280,B111; EN 12449, 12451; DIN EN 12735; JIS H3300 | C10100 (OFE), C11000 (ETP), C12200 (DHP), C23000, C70600,C71500 | OD: 3mm - 300mm Wall Thickness: 0.5mm - 20mm Temper: Soft (O), Half-Hard (H50), Hard (H80) Form: Straight Lengths, Coils, U-Bends |
| Copper Sheets / Plates | ASTM B152, B248, B248M; EN 1652; DIN 1787; JIS H3100, H3250 | C10100 (OFE), C11000, C10200 (OF), C26000, C86200 | Thickness: 0.3mm - 100mm Width: Up to 1200mm Length: Up to 3000mm (or coils) Surface: Mill, Polished, Brushed |
| Copper Rods / Bars | ASTM B187, B301, B411; EN 12163, 12164; DIN 17672; JIS H3250 | C10100 (OFE), C11000, C14500, C36000, C63000 | Diameter/Rect. Size: 3mm - 300mm Shape: Round, Square, Hexagonal, Rectangular Condition: Drawn, Extruded, Hot Rolled |
| Copper Wires | ASTM B1, B2, B3, B258; EN 13601; IEC 60228; JIS H3100 | C10100 (OFE), C11000, C14420, C14500 | Diameter: 0.1mm - 20mm Temper: Soft, Annealed, Hard-Drawn Form: Bare, Tinned, Stranded, on Spools |
| Copper Foils / Strips | ASTM B103, B370; EN 1652; DIN 1787; JIS H3100 | C10100 (OFE), C10200, C11000, C19400, C26800 | Thickness: 0.02mm - 2.0mm Width: Up to 600mm Temper: Rolled, Annealed |
| CNC Machining Parts | As per Customer Drawing/Req. | All Common Copper Alloys (including C10100, C11000, C86200, etc.) | Process: Turning, Milling, Drilling, Tapping Tolerance: ±0.005mm - ±0.1mm Post-Processing: Deburring, Polishing, Plating |
Our factory
Our manufacturing facility operates a comprehensive and modern production line, equipped with advanced continuous casting, precision rolling, high-speed drawing, and multi-axis CNC machining centers, enabling us to process copper and copper alloys (such as C10100, C11000, C12200, C71500,C70600 etc.) into a full range of products including tubes, sheets, rods, wires, and foils. To ensure top-tier quality, we have implemented a rigorous in-process and final inspection system, utilizing state-of-the-art equipment such as spectrometers for material verification, digital tensile testers for mechanical property checks, precision dimensional gauges, and eddy current or ultrasonic testers for defect detection, guaranteeing that every product meets or exceeds international standards such as ASTM, EN, and JIS, as well as specific customer requirements.
