Alloy 400 (Monel) vs Cu-Ni 70/30
Alloy 400 (Monel) (UNS N04400) 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 170 MPa for Alloy 400 (Monel) (-26%); tensile 360 vs 480 MPa.
- Density: 8.8 vs 8.95 g/cm³ — Cu-Ni 70/30 is 1.7% heavier.
- Typical use: Alloy 400 (Monel) — Seawater, HF acid, alkalis. Cu-Ni 70/30 — Annealed; Zn ≤ 1.0, Pb ≤ 0.05.
| Property | Alloy 400 (Monel) | Cu-Ni 70/30 |
|---|---|---|
| Family | Nickel-copper | Copper-nickel |
| UNS | N04400 | C71500 |
| EN / W.Nr | 2.4360 NiCu30Fe | CW354H CuNi30Mn1Fe |
| Basis spec | ASTM B564 | ASTM B466 / B111 |
| Density g/cm³ | 8.8 | 8.95 |
| Chemical composition, % | ||
| C | 0.3 | – |
| Mn | 2.0 | 1.0 |
| S | 0.024 | – |
| Si | 0.5 | – |
| Ni | 63.0 min | 29.0–33.0 |
| Cu | 28.0–34.0 | bal |
| Fe | 2.5 | 0.40–1.0 |
| Mechanical properties (min) | ||
| Tensile strength | 480 MPa (70 ksi) | 360 MPa (52 ksi) |
| Yield strength (0.2%) | 170 MPa (25 ksi) | 125 MPa (18 ksi) |
| Elongation | 35% | – |
| 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 Alloy 400 (Monel) and Cu-Ni 70/30?
Strength: Cu-Ni 70/30 minimum yield is 125 MPa vs 170 MPa for Alloy 400 (Monel) (-26%); tensile 360 vs 480 MPa. Density: 8.8 vs 8.95 g/cm³ — Cu-Ni 70/30 is 1.7% heavier. Typical use: Alloy 400 (Monel) — Seawater, HF acid, alkalis. Cu-Ni 70/30 — Annealed; Zn ≤ 1.0, Pb ≤ 0.05.
Which is stronger, Alloy 400 (Monel) or Cu-Ni 70/30?
Alloy 400 (Monel) has the higher minimum yield strength (170 MPa vs 125 MPa).
Last updated 2026-11-02