CuNi30Mn1Fe
CW354H70/30 copper-nickel alloy — the premium marine cupronickel. Higher Ni than 90/10 (CuNi10Fe1Mn) for superior seawater corrosion resistance, especially in polluted or high-velocity water (up to 4.5 m/s). Used for condenser tubes, desalination plant tubing, propeller sleeves, seawater piping, and heat exchangers in naval and offshore service.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C71500 | C71500 | REF |
| 🇪🇺 | EN | Europe | CuNi30Mn1Fe | CW354H | 100% |
| 🇬🇧 | BS | United Kingdom | CN107 | — | 95% |
Sources: ASTM B171, EN 12163, BS 2871
Chemical composition comparison (wt%)
Side-by-side: CuNi30Mn1Fe (EN) (EN 12163) vs CN107 (BS)
| Element | CuNi30Mn1Fe (EN) | CN107 (BS) | Overlap |
|---|---|---|---|
| C | 0–0.05% | — | — |
| Mn | 0.5–1.5% | — | — |
| S | 0–0.02% | — | — |
| Ni | 29–33% | — | — |
| Fe | 0.4–1% | — | — |
| Pb | 0–0.02% | — | — |
| Zn | 0–0.5% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 370 | MPa |
| Yield Strength | ≥ 125 | MPa |
| Elongation | ≥ 36 | % |
| Elastic Modulus | ≥ 150 | GPa |
| Density | ≥ 8.94 | g/cm3 |
Compatibility verdict
CuNi30Mn1Fe and CN107: 95% composition match
Close equivalents but NOT identical.
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