CuNi Alloy
Cupronickel or copper nickel (CuNi) is an alloy of copper with nickel, usually along with small quantities of other metals added for strength, such as iron and manganese. The copper content typically varies from 60 to 90 percent. (Monel is a nickel – copper alloy that contains a minimum of 52 percent nickel.)
Key Properties
Good corrosion resistance, especially to seawater, salt spray, and bio-fouling
Excellent thermal stability
High ductility and toughness
Good electrical resistivity (but lower than nichrome)
Non-magnetic, even with higher nickel content
Common Uses
Marine hardware: Pipes, heat exchangers, seawater condensers
Desalination plants
Coins: Many coins worldwide use CuNi (e.g., U.S. nickel)
Thermocouples: CuNi is used in Type T and Type E thermocouples (e.g., constantan = CuNi ~45%)
Resistors and heating elements (less common than nichrome)
Specifications
| Properties/Material | Resistivity (200°C µΩ·m) | Max. working temp. (°C) | Tensile strength (Mpa) | Melting point (°C) | Density (g/cm³) | TCR x10⁻⁶/°C (20–600°C) | EMF vs Cu (µV/C) (0–100°C) |
|---|---|---|---|---|---|---|---|
| NC003 (CuNi1) | 0.03 | 200 | 210 | 1085 | 8.9 | < 100 | -8 |
| NC005 (CuNi2) | 0.05 | 200 | 220 | 1090 | 8.9 | < 120 | -12 |
| NC012 (CuNi8) | 0.1 | 220 | 250 | 1095 | 8.9 | < 60 | -18 |
| NC015 (CuNi10) | 0.15 | 250 | 290 | 1100 | 8.9 | < 50 | -25 |
| NC020 (CuNi10) | 0.2 | 300 | 310 | 1115 | 8.9 | < 30 | -28 |
| NC025 (CuNi19) | 0.25 | 300 | 340 | 1135 | 8.9 | < 25 | -32 |
| NC030 (CuNi23) | 0.3 | 300 | 350 | 1150 | 8.9 | < 16 | -34 |
| NC035 (CuNi30) | 0.35 | 350 | 400 | 1170 | 8.9 | < 10 | -37 |
| NC040 (CuNi34) | 0.4 | 350 | 400 | 1180 | 8.9 | 0 | -39 |
| NC050 (CuNi44) | 0.5 | 400 | 420 | 1200 | 8.9 | < -6 | -43 |
| Performance | Constant 6J40 | New Constant 6J11 | Manganin 6J12 | Manganin 6J8 | Manganin 6J13 |
|---|---|---|---|---|---|
| Mn | 1~2 | 10.5~12.5 | 11~13 | 8~10 | 11~13 |
| Ni | 39~41 | - | 2~3 | - | - |
| Cu | Rest | Rest | Rest | Rest | Rest |
| Temperature Range for Components | - | A12.5~4.5 Fe1.0~1.6 | - | - | - |
| Density g/cm³ | 5~500 | 5~500 | 5~45 | 10~80 | 10~80 |
| Resistivity µΩ·m, 20°C | 0.48 ± 0.03 | 0.49 ± 0.03 | 0.47 ± 0.03 | 0.35 ± 0.05 | 0.44 ± 0.04 |
| Extensibility % Φ0.5 | ≥15 | ≥15 | ≥15 | ≥15 | ≥15 |
| Resistance Temperature Quotient α, 10~6/°C | -40~+40 | -80~+80 | -3~+20 | -5~+10 | 0~+40 |
| Thermoelectric force to Copper µV (0~100) | 45 | 2 | 1 | 2 | 2 |
CUNI Alloy
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Phone / WhatsApp: (86) 152 9851 3019
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Email: nora@czalloytech.com
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