Cu-Ni 90/10 vs Cu-Ni 70/30
Cu-Ni 90/10 (UNS C70600) vs Cu-Ni 70/30 (UNS C71500): chemical composition and mechanical properties side by side.
- Strength: Cu-Ni 70/30 minimum yield is 125 MPa vs 105 MPa for Cu-Ni 90/10 (+19%); tensile 360 vs 275 MPa.
- Density: 8.94 vs 8.95 g/cm³ — Cu-Ni 70/30 is 0.1% heavier.
- Typical use: Cu-Ni 90/10 — Annealed; Zn ≤ 1.0, Pb ≤ 0.05. Cu-Ni 70/30 — Annealed; Zn ≤ 1.0, Pb ≤ 0.05.
| Property | Cu-Ni 90/10 | Cu-Ni 70/30 |
|---|---|---|
| Family | Copper-nickel | Copper-nickel |
| UNS | C70600 | C71500 |
| EN / W.Nr | CW352H CuNi10Fe1Mn | CW354H CuNi30Mn1Fe |
| Basis spec | ASTM B466 / B111 | ASTM B466 / B111 |
| Density g/cm³ | 8.94 | 8.95 |
| Chemical composition, % | ||
| Mn | 1.0 | 1.0 |
| Ni | 9.0–11.0 | 29.0–33.0 |
| Cu | bal | bal |
| Fe | 1.0–1.8 | 0.40–1.0 |
| Mechanical properties (min) | ||
| Tensile strength | 275 MPa (40 ksi) | 360 MPa (52 ksi) |
| Yield strength (0.2%) | 105 MPa (15 ksi) | 125 MPa (18 ksi) |
| Elongation | – | – |
| Hardness (max) | – | – |
| PREN (min, from spec) | – | – |
Single values are maximums; ranges are min–max; "bal" = balance. Limits are typical of the basis specification for that product form — forgings, pipe and fittings specifications differ slightly. Always check the exact specification, edition and the mill test certificate.
Frequently asked questions
What is the difference between Cu-Ni 90/10 and Cu-Ni 70/30?
Strength: Cu-Ni 70/30 minimum yield is 125 MPa vs 105 MPa for Cu-Ni 90/10 (+19%); tensile 360 vs 275 MPa. Density: 8.94 vs 8.95 g/cm³ — Cu-Ni 70/30 is 0.1% heavier. Typical use: Cu-Ni 90/10 — Annealed; Zn ≤ 1.0, Pb ≤ 0.05. Cu-Ni 70/30 — Annealed; Zn ≤ 1.0, Pb ≤ 0.05.
Which is stronger, Cu-Ni 90/10 or Cu-Ni 70/30?
Cu-Ni 70/30 has the higher minimum yield strength (125 MPa vs 105 MPa).
Last updated 2026-11-02