Copper-Nickel Alloy (Cu-Ni 90/10 & 70/30)
Corrosion-Resistant Marine & Heat Exchanger Solutions by Huaxiao-Alloy
1. What Is Copper-Nickel Alloy?
Copper-Nickel Alloy (Cu-Ni Alloy) is a high-performance copper alloy primarily composed of copper and nickel, with small additions of iron and manganese to enhance strength and corrosion resistance. It is internationally recognized as one of the most reliable materials for seawater, marine, and heat exchanger applications.
At Huaxiao-Alloy, Cu-Ni alloys are supplied as engineered corrosion-resistant solutions, not just metal products. We support customers from material selection to fabrication and export compliance, ensuring long-term performance in aggressive environments.
2. Copper-Nickel Alloy Grades & UNS Numbers
| Alloy | UNS No. | Common Designation |
|---|---|---|
| Cu-Ni 90/10 | UNS C70600 | Copper-Nickel 90/10 |
| Cu-Ni 70/30 | UNS C71500 | Copper-Nickel 70/30 |
Huaxiao-Alloy Engineering Insight:
90/10 is preferred for moderate seawater and heat exchanger systems.
70/30 offers higher strength and superior resistance in high-velocity or polluted seawater.
3. Chemical Composition
Cu-Ni 90/10 (C70600)
| Element | Content (%) |
|---|---|
| Copper (Cu) | Balance |
| Nickel (Ni) | 9.0–11.0 |
| Iron (Fe) | ≤ 1.8 |
| Manganese (Mn) | ≤ 1.0 |
Cu-Ni 70/30 (C71500)
| Element | Content (%) |
|---|---|
| Copper (Cu) | Balance |
| Nickel (Ni) | 29.0–33.0 |
| Iron (Fe) | ≤ 0.8 |
| Manganese (Mn) | ≤ 1.0 |
4. Mechanical & Physical Properties
| Property | 90/10 | 70/30 |
|---|---|---|
| Tensile Strength | ~340 MPa | ~410 MPa |
| Yield Strength | ~120 MPa | ~150 MPa |
| Thermal Conductivity | ~50 W/m·K | ~40 W/m·K |
| Density | 8.9 g/cm³ | 8.95 g/cm³ |
Huaxiao-Alloy can supply annealed or cold-worked conditions depending on design requirements.
5. Key Advantages of Copper-Nickel Alloy
Exceptional resistance to seawater corrosion
Excellent resistance to biofouling
Stable mechanical strength under pressure
Good weldability and fabrication performance
Long service life with low maintenance
6. Typical Applications
Huaxiao-Alloy supplies Cu-Ni alloys for:
Seawater piping systems
Heat exchangers and condensers
Offshore platforms and shipbuilding
Desalination plants
Power plant cooling systems
Copper-Nickel alloys are industry-standard materials for marine and offshore engineering.
7. Available Forms & Supply Capabilities
Tubes & Pipes
Plates & Sheets
Bars & Rods
Supported Standards:
ASTM B111 / ASTM B466 / ASTM B467
UNS C70600 / C71500
EN CW352H / CW354H
Huaxiao-Alloy Capabilities:
Custom dimensions and wall thickness
Tube bending and fabrication support
Export-grade packaging for marine transport
8. Cu-Ni Alloy vs Stainless Steel
| Property | Copper-Nickel | Stainless Steel |
|---|---|---|
| Seawater Corrosion | Excellent | Risk of pitting |
| Biofouling Resistance | Excellent | Moderate |
| Thermal Conductivity | Higher | Lower |
| Maintenance Cost | Lower | Higher |
Huaxiao-Alloy Recommendation:
For continuous seawater exposure, Cu-Ni alloys outperform most stainless steels.
9. Standards & Quality Assurance
ASTM / UNS / EN compliance
ISO quality management system
ROHS & REACH compliance
Full material traceability
Huaxiao-Alloy ensures stable performance in critical marine systems.
Yes. Especially 70/30 Cu-Ni, which is designed for high-velocity and polluted seawater.
Yes. Custom lengths and fabrication support are available.
Cu-Ni offers better resistance to biofouling and more stable corrosion performance.
11. Why Choose Huaxiao-Alloy?
One-stop supplier for copper and copper alloys
Proven expertise in marine and heat exchanger materials
Custom processing and global export support
Stable supply for long-term infrastructure projects
Engineering-driven material solutions
Huaxiao-Alloy delivers materials that perform in the harshest environments.
12. Get a Quote – Marine-Grade Copper Solutions
📧 Email: [email protected]
📱 WhatsApp: +1 (579) 300-2733
Let Huaxiao-Alloy support your marine and heat transfer systems with reliable Copper-Nickel alloy solutions.
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