What is C70600 ?
UNS C70600 is a 90% copper and 10% nickel alloy with tiny traces of other elements such as iron and manganese.
C70600 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. CW352H is the EN numeric designation for this material. C70600 is the UNS number. Additionally, the EN chemical designation is CuNi10Fe1Mn. The British Standard (BS) designation is CN102. And the common industry name is Cupronickel 10.
C70600 Copper-Nickel Tubes (CuNi 90/10) are high-strength, corrosion-resistant tubing solutions composed of 90% copper and 10% nickel, with small amounts of iron and manganese for enhanced seawater corrosion resistance, biofouling resistance, and durability. These tubes are widely used in marine, offshore, power generation, and industrial applications due to their excellent mechanical properties and longevity in harsh environments.
Standard Specifications for C70600 Copper-Nickel Tubes:
Material Standard: ASTM B466, ASTM B111, ASME SB466, SB111
Size Range: 6 mm to 300 mm outer diameter (Custom sizes available)
Wall Thickness: 0.5 mm to 10 mm
Length: Random, Cut-to-Length, Coil Form
Pressure Rating: Available in Sch 5, Sch 10, Sch 40, Sch 80
Manufacturing Processes: Seamless & Welded
Composition of C70600 Copper-Nickel Tubes
| C70600 chemical composition | DIN 86019 | EEMUA 144 | BS 2871 | ASTM B466 | JIS H 3300 | MIL-T-16420K |
| Ni% | 9.0-11.0 | 10.0-11.0 | 10.0-11.0 | 9.0-11.0 | 9.0-11.0 | 9.0-11.0 |
| Fe% | 1.5-1.8 | 1.5-2.0 | 1.0-2.0 | 1.0-1.8 | 1.0-1.8 | 1.0-1.8 |
| Mn% | 0.5-1.0 | 0.5-1.0 | 0.5-1.0 | Max.1.0 | 0.2-1.0 | Max1.0 |
| C% | Max.0.05 | Max.0.05 | Max.0.05 | Max.0.05 | Max.0.05 | |
| Pb% | Max.0.03 | Max.0.01 | Max.0.01 | Max.0.02 | Max.0.05 | Max.0.02 |
| S% | Max.0.015 | Max.0.02 | Max.0.05 | Max.0.02 | Max.0.02 | |
| P% | Max.0.02 | Max.0.02 | Max.0.02 | Max.0.02 | ||
| Zn% | Max.0.15 | Max.0.20 | Max.0.50 | Max.0.50 | Max.0.05 | |
| Zr% | Max.0.03 | |||||
| Others | Max.0.30 | Max.0.30 | Max.0.30 | |||
| Cu% | Balance | Balance | Balance | Balance | Cu+Ni+Fe+MnMin.99.5 | Min.86.5 |
Equivalent grade of C70600
| Grade | USA | U.K | Germany | Japan |
| China BG | ASTM B 111 | BS | DIN | JIS H |
| BFe10-1-1 | C70600 | CN102 | CuNi10Fe1Mn | C7060 |
Applications of C70600 Copper-Nickel Tubes:
Marine & Shipbuilding – Seawater cooling, condensers, heat exchangers, ballast systems
Oil & Gas Industry – Offshore platforms, desalination plants, piping systems'
Power Generation – Steam turbines, nuclear plants, cooling systems
Aerospace & Defense – Hydraulic tubing, high-performance applications
Chemical Processing – Acid-resistant piping, corrosion-resistant equipment
Benefits of C70600 Copper-Nickel Tubes:
Superior Corrosion & Biofouling Resistance – Ideal for marine environments
High Strength & Durability – Withstands mechanical stress & high-pressure systems
Excellent Thermal Conductivity – Efficient heat exchange in cooling applications
Good Weldability & Fabrication – Compatible with standard welding techniques
Long Service Life – Reduces maintenance costs and enhances system reliability
FAQ
1. What is the difference between C70600 and C71500?
C71500 has higher nickel content (30% vs 10%) and better corrosion resistance in aggressive seawater. C70600 (90/10) contains 90% copper and 10% nickel. C71500 (70/30) contains 70% copper and 30% nickel. C71500 is stronger and more resistant to high-velocity seawater, but C70600 is more affordable and easier to weld.
2. What are the equivalent standards for C70600?
C70600 equivalents are ASTM B466 (USA), BS CN102 (UK), DIN CuNi10Fe1Mn (Germany), JIS C7060 (Japan), and BG BFe10-1-1 (China). All these standards cover the same 90/10 copper-nickel alloy composition with Ni 9-11% and Fe 1.0-1.8%.
3. Can C70600 be welded?
Yes, C70600 has excellent weldability. Use TIG or MIG welding with ERCuNi filler metal. No preheating is needed for wall thickness under 1 inch. Clean the weld area thoroughly before welding and use argon shielding gas.
4. Is C70600 suitable for seawater cooling systems?
Yes, C70600 is the industry standard for seawater cooling systems. Its superior corrosion resistance and anti-biofouling properties make it ideal for marine condensers, heat exchangers, and ballast water lines.
5. What is the maximum operating temperature for C70600?
C70600 can operate continuously at up to 315°C (600°F). Above this temperature, strength decreases significantly. For higher temperature applications, consider C71500 or nickel-based alloys.
6. Does C70600 require heat treatment after welding?
No, post-weld heat treatment is generally not required. For thin sections (under 1 inch), welding without preheating or post-weld heat treatment is acceptable. Stress relief may be considered for heavy sections or critical applications.
7. What is C70600 used for in power plants?
C70600 is used for condenser tubes and heat exchanger tubes in thermal and nuclear power plants. It efficiently transfers heat while resisting corrosion from cooling water, including seawater and brackish water.
8. Is C70600 magnetic?
No, C70600 is non-magnetic. Neither copper (90%) nor nickel (10%) in this alloy creates magnetic properties. This makes C70600 suitable for applications near sensitive electronic equipment.
9. How does C70600 resist biofouling?
Copper ions released from the tube surface prevent marine organism attachment. This natural anti-biofouling property reduces maintenance costs and maintains heat exchange efficiency in marine environments.
10. What sizes does C70600 come in?
C70600 is available from 6mm to 300mm outer diameter, with wall thickness from 0.5mm to 10mm. Standard pressure ratings include Schedule 5, 10, 40, and 80. Custom sizes and coiled tubing are also available.
11. Is C70600 suitable for desalination plants?
Yes, C70600 is widely used in desalination plants for evaporator tubes and heat exchangers. Its excellent resistance to saline water and high temperatures makes it a reliable choice for both thermal and reverse osmosis desalination facilities.
12. What is the lead time for C70600 tubes from GNEE?
Standard sizes are available for immediate shipment from GNEE inventory. Custom sizes typically require 3-4 weeks for production. Urgent orders can be expedited upon request.
Quality Testing for C70600 U-Bend Tube
| Test Type | Description | Frequency |
|---|---|---|
| Chemical Analysis | Verifies Ni (9-11%), Fe (1.0-1.8%), Mn (max 1.0%), and balance Cu | Per heat |
| Mechanical Testing | Tensile strength, yield strength, and elongation | Per lot |
| Flattening Test | Squeezes tube between flat plates to detect defects | Per lot |
| Expansion Test | Expands tube with tapered mandrel to check ductility | Per lot |
| Eddy Current Testing | Non-destructive detection of surface and near-surface flaws | 100% |
| Hydrostatic Test | Pressure test to verify integrity | 100% |
| Hardness Test | Rockwell or Vickers hardness verification | Per lot |
| Microscopic Examination | Grain structure and inclusion analysis | Per heat |
| Intergranular Corrosion Test | Verify resistance to grain boundary attack | As required |
| Reverse Flattening Test | Opens flattened tube to detect lamination | As required |
Packaging for C70600 Coiled Tubing
| Packaging Item | Specification |
|---|---|
| Inner Protection | Rust-preventive oil coating + VCI paper wrapping |
| End Protection | Plastic caps (both ends) to prevent moisture and debris ingress |
| Bundling | Hexagonal or round bundles with galvanized steel straps (3-4 straps per bundle) |
| Bundle Weight | 500kg to 3000kg per bundle depending on diameter |
| Intermediate Layer | Plastic woven cloth between layers to prevent scratching |
| Wooden Pallets | Heat-treated (ISPM-15 certified) plywood pallets with steel edge protection |
| Outer Wrapping | Waterproof plastic sheet + reinforced kraft paper |
| Labeling | Standard export label with grade, size, heat number, and quantity |
| Container Loading | 20ft or 40ft containers with dunnage bags to prevent shifting |
Factory Equipment for C70600 Nickel Pipe Production
| Equipment | Specification / Capacity |
|---|---|
| Vacuum Induction Melting (VIM) Furnace | 3-ton capacity, precise control of Ni (9-11%) and Fe (1.0-1.8%) |
| Horizontal Continuous Caster | Produces 100-200mm diameter billets, 6-meter length |
| Extrusion Press | 2500-ton, max extrusion ratio 40:1, billet temperature 850-950°C |
| High-Speed Cold Pilger Mill | Max rolling speed 120 strokes/min, reduces OD by 40-60% per pass |
| Multi-Pass Draw Bench | 30-ton capacity, maximum tube length 18 meters, drawing speed 10-30 m/min |
| Bright Annealing Furnace | Controlled hydrogen atmosphere, temperature range 600-800°C, dew point -60°C |
| Inline Straightening Machine | 6-roll rotary, straightness tolerance 0.5mm per meter |
| CNC Tube Cutting Line | Cutting tolerance ±0.5mm, burr-free ends, capacity 6,000 pieces/shift |
| Eddy Current Tester (ECT) | Frequency range 10kHz to 1MHz, detects 0.1mm deep flaws |
| Ultrasonic Tester (UT) | Immersion method, detects 0.2mm ID/OD flaws, 100% inspection |
| Hydrostatic Tester | Max test pressure 10,000 psi, automated cycle with data logging |
All Product Range from GNEE
| Material Category | Key Grades | Common Applications | Available Forms |
|---|---|---|---|
| Pure Copper | C10100, C10200, C11000, C12200 | Electrical components, busbars, plumbing, HVAC, roofing | Pipe, tube, sheet, plate, bar, busbar |
| Brass | C26000, C27000, C28000, C46400, C48500 | Plumbing fittings, marine hardware, valve stems, radiators, fasteners | Pipe, tube, rod, hex bar, sheet, forging |
| Copper-Nickel (Cupronickel) | C70600 (90/10), C71500 (70/30), C70400, C71000, C72200 | Seawater cooling lines, condenser tubes, desalination, shipbuilding, offshore platforms | Seamless pipe, welded tube, U-bend tube, coiled tubing, straight pipe |
| Bronze | C51000, C52100, C54400, C61400, C62300 | Bushings, wear plates, pump impellers, valves, marine propellers | Tube, rod, plate, forging, casting |
| Aluminum Bronze | C61400, C62300, C63000, C95400, C95500 | High-strength valve bodies, gears, pump components, marine hardware, propellers | Pipe, bar, forging, casting, sheet |
| Beryllium Copper | C17000, C17200, C17500 | High-strength springs, downhole tools, connectors, mold inserts, welding tips | Rod, bar, wire, strip, casting |
