Copper-Nickel 90/10 Tube Sheet
The economical default for general seawater cooling — good biofouling and corrosion resistance at a lower nickel content and cost than 70/30, adequate for the majority of standard marine condenser applications.
Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| Copper (Cu) | Balance | — |
| Nickel (Ni) | 9.0 | 11.0 |
| Iron (Fe) | 1.0 | 1.8 |
| Manganese (Mn) | — | 1.0 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 275 MPa min (annealed) |
| Yield Strength (0.5% ext.) | 105 MPa min (annealed) |
| Elongation | 30% min |
| Max. Practical Service Temp. | ~300°C |
Equivalent Grades
| Standard | Designation |
|---|---|
| ASTM / UNS | C70600 |
| EN / DIN | CuNi10Fe1Mn / CW352H |
90/10 vs. 70/30 — Which One
See the full Copper-Nickel 70/30 datasheet for the higher-nickel premium grade.
Applications
General seawater and brackish water cooling systems, standard marine condensers, and desalination plant condensers operating within moderate flow velocity ranges where 70/30's extra nickel isn't required.
Advantages & Limitations
Advantages
- Most economical of the copper-nickel marine alloys
- Good general seawater corrosion and biofouling resistance
- Long, well-documented service history
Limitations
- Lower erosion-corrosion resistance than 70/30 at high velocity
- Lower strength than stainless or duplex alternatives
- Not suitable for the most aggressive biofouling conditions
FAQ
Yes — for the large majority of standard seawater and brackish cooling water systems at moderate flow velocity, 90/10 provides adequate corrosion and biofouling resistance at a lower cost than 70/30.
There's no single universal threshold — it depends on the specific system design, but as flow velocity increases and erosion-corrosion risk grows, 70/30's higher nickel content provides meaningfully better resistance. Confirm with your corrosion engineer against your specific design velocity.
Yes, 90/10 is typically ex-stock in common diameters given its high demand as the economical default marine alloy — confirm your specific size for immediate availability.