Product Description
CuNi44 Foil
Product Overview
CuNi44 foil is a high-performance copper-nickel alloy foil with a nominal nickel content of 44%, offering exceptional electrical resistance stability, corrosion resistance, and formability. This precision-engineered foil is produced through advanced rolling processes to achieve tight dimensional tolerances, making it ideal for applications requiring consistent electrical properties and thin-gauge material performance—such as precision resistors, strain gauges, and thermocouple components.
Standard Designations
- Alloy Grade: CuNi44 (Copper-Nickel 44)
- UNS Number: C71500
- DIN Standard: DIN 17664
- ASTM Standard: ASTM B122
Key Features
- Stable Electrical Resistance: Low temperature coefficient of resistance (TCR) of ±40 ppm/°C (typical) over -50°C to 150°C, ensuring minimal resistance drift in temperature-fluctuating environments.
- High Resistivity: 49 ± 2 μΩ·cm at 20°C, suitable for high-precision resistance components.
- Excellent Formability: High ductility allows for cold rolling to ultra-thin gauges (down to 0.005mm) and complex stamping without cracking.
- Corrosion Resistance: Resistant to atmospheric corrosion, freshwater, and mild chemical environments (complies with ISO 9227 salt spray test for 500 hours with minimal oxidation).
- Thermal Stability: Maintains mechanical and electrical properties up to 300°C (continuous use).
Technical Specifications
Attribute |
Value |
Thickness Range |
0.005mm – 0.1mm (custom up to 0.5mm) |
Width Range |
10mm – 600mm |
Thickness Tolerance |
±0.0005mm (for ≤0.01mm); ±0.001mm (for >0.01mm) |
Width Tolerance |
±0.1mm |
Tensile Strength |
450 – 550 MPa (annealed state) |
Elongation |
≥25% (annealed state) |
Hardness (HV) |
120 – 160 (annealed); 200 – 250 (half-hard) |
Surface Roughness (Ra) |
≤0.1μm (polished finish) |
Chemical Composition (Typical, %)
Element |
Content (%) |
Nickel (Ni) |
43.0 – 45.0 |
Copper (Cu) |
Balance (55.0 – 57.0) |
Iron (Fe) |
≤0.5 |
Manganese (Mn) |
≤1.0 |
Silicon (Si) |
≤0.1 |
Carbon (C) |
≤0.05 |
Total Impurities |
≤0.7 |
Product Specifications
Item |
Specification |
Surface Finish |
Annealed (bright), polished, or matte |
Supply Form |
Rolls (length: 50m – 500m) or cut sheets (custom sizes) |
Packaging |
Vacuum-sealed in moisture-proof bags with anti-oxidation paper; wooden spools for rolls |
Processing Options |
Slitting, cutting, annealing, or coating (e.g., insulation layers for electrical applications) |
Quality Certification |
RoHS, REACH compliant; material test reports (MTR) available |
Typical Applications
- Electrical Components: Precision resistors, current shunts, and potentiometer elements.
- Sensors: Strain gauges, temperature sensors, and pressure transducers.
- Thermocouples: Compensation wires for Type T thermocouples.
- Shielding: EMI/RFI shielding in high-frequency electronic devices.
- Heating Elements: Low-power heating foils for medical and aerospace equipment.
We offer custom processing services tailored to specific application requirements. Free samples (100mm × 100mm) and detailed material certificates are available upon request.
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CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components