Cupronickel
Cupronickel Strip · Cupronickel Sheet
Copper-nickel alloy (Cu-Ni) products covering mainstream grades such as B10 (CuNi90-10) and B30 (CuNi70-30). Known for excellent seawater corrosion resistance, a low temperature coefficient of resistance and good mechanical properties, it is the material of choice for marine and offshore engineering, heat exchangers and precision resistor elements. Custom thicknesses, widths and tolerance grades available.
· Product Features
- ≈38 μΩ·cm resistivity
- Seawater-grade corrosion resistance
- 0.1–3.0 mm thickness range
- 600 mm max width
Key Parameters
Cupronickel Grades
Copper-nickel alloys to Chinese national (GB) and major international standards, meeting seawater corrosion resistance and low temperature coefficient of resistance requirements.
Available Specifications & Parameters
Full supply range for cupronickel strip and sheet, with non-standard customization available.
| Product form | Thickness range | Width range | Length (sheet) | Notes |
|---|---|---|---|---|
| Cupronickel strip | 0.1 – 3.0 mm | 20 – 600 mm | Supplied in coils | Slitting available |
| Cupronickel sheet | ≥0.5 – 3.0 mm | 20 – 600 mm | ≤ 6000 mm | Sheet thickness 0.5 mm minimum |
Temper
- Soft (M/O) — Annealed, high ductility, suitable for forming
- Half hard (Y2/H) — Balanced strength and plasticity
- Hard (Y/EH) — High strength, suitable for structural parts
- Extra hard (T/SH) — Highest strength, spring-grade hardness
Quality Assurance
- Each batch comes with a certificate of analysis (COA), including chemical composition report
- Third-party certification (SGS, CTI, etc.) available
- Compliant with GB/T 2059 (strip) and GB/T 2040 (sheet) national standards
- Supply to international standards such as ASTM B122, JIS H3300 and EN 12167
Key Physical Properties
Typical physical and mechanical properties of cupronickel (based on B10/B30).
| Property | B10 value | B30 value | Unit | Notes |
|---|---|---|---|---|
| Density | 8.90 – 8.94 | 8.94 – 8.98 | g/cm³ | Increases slightly with nickel content |
| Resistivity | ≈38 – 45 | ≈34 – 38 | μΩ·cm | Value at 20°C |
| Temperature coefficient of resistance | ≤0.00015 | ≤0.00012 | /°C | Low temperature drift |
| Thermal conductivity | 40 – 50 | 25 – 35 | W/(m·K) | Higher for B10 |
| Melting point | 1100 – 1150 | 1170 – 1240 | °C | Solid-liquid range |
| Tensile strength (M) | ≥280 | ≥350 | MPa | Soft annealed temper |
| Tensile strength (Y) | 400 – 520 | 480 – 650 | MPa | Hard cold-worked temper |
| Elongation (M) | ≥30 – 35% | ≥25 – 30% | % | Ductility in soft temper |
| Operating temperature | -200 ~ +300 | -200 ~ +300 | °C | Suitable for a wide temperature range |
| Seawater corrosion resistance | Outstanding | Outstanding | — | No pitting tendency |
Main Applications
With outstanding seawater corrosion resistance and stable electrical properties, cupronickel plays an irreplaceable role in key industries.
Marine & Offshore
Condenser tube sheets, heat exchanger tube bundles, propeller bearings, valve bodies, seawater piping systems
Seawater Desalination
Evaporator heat transfer tubes, flash chamber components, brine heaters, pump shafts and impellers, seals
Electrical & Electronics
Precision resistor elements, strain gauges, compensating wires, low-temperature resistance materials, relay springs
Chemical Equipment
Vessel linings for acid and alkali environments, chemical reactor internals, corrosion-resistant flange gaskets, instrument tubing
Refrigeration & HVAC
Chiller evaporator/condenser tube sheets, central air conditioning heat exchange components, refrigerant piping
Instrumentation
High-precision resistance sensors, thermocouple protection tubes, precision measuring elastic elements, vacuum devices
Need custom specifications or a volume quote?
We provide complete certificates of analysis (COA), third-party test reports and export packaging.
Small trial batches and long-term supply agreements supported. Our team will provide technical selection advice.