UNS C70600 Copper Nickel, also known as 90/10 Copper-Nickel, C70600 CuNi10Fe1Mn, or CW352H, is a premium copper-nickel alloy containing approximately 90% copper and 10% nickel, with controlled additions of iron and manganese to enhance strength and corrosion resistance. It is one of the most widely used marine-grade copper alloys due to its excellent resistance to seawater corrosion, biofouling, and stress cracking.
Manufactured according to standards such as ASTM B111, ASTM B466, ASTM B122, ASTM B171, and EN 12451, C70600 material is available in various product forms - seamless tubes, condenser tubes, sheets, plates, rods, and fittings. It is extensively used in shipbuilding, offshore, power generation, desalination, and heat exchanger applications.
01
High Quality
02
Advanced Equipment
03
Professional Team
04
Custom Service
Products Description
UNS C70600 is a copper-nickel alloy containing approximately 90% copper and 10% nickel, with trace amounts of iron and manganese. It is commonly referred to as a 90/10 copper-nickel alloy. This alloy exhibits excellent corrosion resistance, anti-corrosion properties, and resistance to biofouling in seawater and other environments. It demonstrates good corrosion resistance in both clean and partially polluted seawater and bay water, and is widely used in heat exchangers in power plants, desalination plants, and petrochemical plants that utilize seawater. This alloy also possesses strong resistance to stress corrosion, cracking, and pitting corrosion.
Keywords: UNS C70600, Copper Nickel 90/10, CuNi10Fe1Mn, CW352H, ASTM B111 Copper Nickel Tube, Seawater Condenser Tube, Marine Heat Exchanger Tube, Cu-Ni Pipe, Copper Nickel Alloy Supplier.
Chemical Composition (Typical %)
| Element | Cu | Ni | Fe | Mn | Pb | Zn | Others |
|---|---|---|---|---|---|---|---|
| Content (%) | 88.6 – 90.6 | 9.0 – 11.0 | 1.0 – 1.8 | 0.5 – 1.0 | ≤0.02 | ≤0.50 | Balance |
Mechanical Properties (Typical)
| Property | Annealed | Cold Worked (H55) | Standard |
|---|---|---|---|
| Tensile Strength (MPa) | 275 – 345 | 380 – 450 | ASTM B111 |
| Yield Strength (0.2% offset, MPa) | 110 – 125 | 130 – 170 | ASTM B111 |
| Elongation (%) | ≥30 | ≥20 | ASTM B111 |
| Hardness (HV) | 80 – 100 | 100 – 130 | ASTM B111 |
| Density | 8.9 g/cm³ | - | - |
| Thermal Conductivity | 50 – 60 W/m·K | - | - |
| Electrical Conductivity | ~6% IACS | - | - |
| Max Working Temp | 300°C (572°F) | - | - |
Product Forms & Standard Sizes
1. Seamless Tube / Pipe (ASTM B111 / B466)
| OD (inch) | OD (mm) | Wall Thickness (mm) | Length | Temper | Application |
|---|---|---|---|---|---|
| 1/4″ | 6.35 | 0.7 | 3 – 6 m | Annealed | Heat exchangers |
| 3/8″ | 9.52 | 0.9 | 3 – 6 m | O60 | Condenser tubes |
| 1/2″ | 12.7 | 1.0 | 3 – 6 m | O61 | Marine piping |
| 3/4″ | 19.05 | 1.5 | 3 – 6 m | Light drawn | Cooling systems |
| 1″ – 4″ | 25.4 – 101.6 | 1.5 – 5.0 | 3 – 6 m | Hard drawn | Offshore pipelines |
| Up to 12″ | 300 mm | 1.5 – 8.0 | 6 m custom | Annealed | Industrial condensers |
2. Plate & Sheet (ASTM B122 / B171)
| Thickness (mm) | Width (mm) | Length (mm) | Finish | Application |
|---|---|---|---|---|
| 1.0 – 3.0 | 600 – 1200 | 2000 – 3000 | Mill Finish | Condenser plates |
| 5.0 – 25.0 | 600 – 1500 | 2000 – 6000 | Hot Rolled | Tube sheet & marine structural base |
| 30.0 – 50.0 | 600 – 1200 | Custom | Machined Finish | Pressure vessel plates |
3. Rod & Bar (ASTM B151)
| Diameter (mm) | Length | Temper | Application |
|---|---|---|---|
| 6 – 150 | 3 m | H55 / M30 | Flanges, valve parts, fittings |
4. Coil / Strip (ASTM B122)
| Thickness (mm) | Width (mm) | Coil Weight | Finish | Application |
|---|---|---|---|---|
| 0.3 – 2.0 | 10 – 400 | 50 – 250 kg | Smooth / Bright | Flexible tubing, shielding, connectors |
5. Fittings & Flanges (ASTM B466 / B467)
| Type | Size Range | Standard | Application |
|---|---|---|---|
| Elbow / Tee / Reducer | 1/2″ – 12″ | ASTM B466 / B467 | Seawater pipelines |
| Flange (Slip-on / Weld Neck) | 1/2″ – 24″ | ASTM B151 | Shipbuilding, desalination plants |
Advantages
Outstanding seawater corrosion and biofouling resistance
Excellent thermal stability and weldability
Suitable for high-velocity seawater (up to 3.5 m/s)
Non-sparking, anti-biofouling surface ideal for marine use
Excellent fabrication and formability characteristics
Compatible with C71500 (70-30 CuNi) and other marine alloys
Conforms to ASTM, EN, and ISO international standards
Products Applications
Shipbuilding and marine engineering (seawater pipelines, hull cooling)
Power plant condensers and feedwater heaters
Offshore platforms and desalination units
Heat exchangers, evaporators, and condensers
Seawater intake/outlet systems
Hydraulic and ballast water systems
Fire protection and sprinkler systems on ships
FAQ
Q1: What is the main difference between C70600 (90/10 CuNi) and C71500 (70/30 CuNi)?
A1: C70600 has lower nickel content (10%) and better ductility, making it cost-effective and suitable for general seawater systems. C71500 has higher strength and better corrosion resistance in extreme conditions.
Q2: How does C70600 resist biofouling and corrosion?
A2: The alloy forms a thin, adherent protective oxide film on the surface, which prevents marine organism growth and resists chloride-induced attack.
Q3: Is C70600 weldable?
A3: Yes. It can be welded using TIG, MIG, or brazing with matching filler metals (AWS A5.7 Class ERCuNi or CuNi10). Pre-cleaning and inert gas shielding are recommended.
Q4: What is the maximum seawater velocity for C70600 pipes?
A4: Up to 3.5 m/s for clean seawater; lower velocities are recommended for polluted or sediment-laden waters.
Q5: What testing and certifications are provided?
A5:
Mill Test Certificate (EN 10204 3.1 / 3.2)
Eddy Current and Hydrostatic Test
PMI and Dimensional Inspection
ASTM B111, B466, B122, B171 compliance reports
Q6: What are typical delivery forms for export?
A6: Standard export bundles or wooden crates with end caps, labeled with heat number, size, and standard, ensuring safe sea shipment.
Q7: Can C70600 be used in heat exchangers with titanium tubes?
A7: Yes, C70600 can be paired with titanium in multi-metal systems if electrical isolation is applied to prevent galvanic corrosion.
Packaging & Supply Details
Length: 3 m / 6 m standard or custom cut
Finish: Bright annealed, mill finish, or polished
Marking: Size + alloy grade + heat number + ASTM standard
Packing: Seaworthy wooden cases or plastic-capped bundles
Certificates: ASTM, EN, ISO 9001, MTC 3.1 included
Looking for a trusted UNS C70600 Copper Nickel 90/10 manufacturer or exporter?
We specialize in seamless CuNi tubes, plates, rods, fittings, and flanges for marine and industrial applications, meeting ASTM B111 / EN 12451 standards.
✅ Custom sizes & OEM machining
✅ Global export with seaworthy packaging
✅ Professional material test reports & certificates
📞 Get a Fast Quote Today!
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
office@dongmjd.com
Hot Tags: uns c70600 copper nickel alloy (90-10 cu-ni), China uns c70600 copper nickel alloy (90-10 cu-ni) manufacturers, suppliers, factory
