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CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components

CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components

CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components
CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components
Categories Copper Nickel Alloy
Brand Name: Huona
Model Number: CuNi44
Certification: ISO9001
Place of Origin: Shanghai
MOQ: 10kg
Price: Negotiable
Payment Terms: L/C,T/T,Western Union,MoneyGram
Supply Ability: 500 tons per year
Delivery Time: 5-21 days
Packaging Details: Carton/Wooden Case
Product Name: CuNi44 flat wire
Thickness Range​: 0.05mm – 0.5mm​
Width Range​: 0.2mm – 10mm​
Tensile Strength​: 450 – 550 MPa (annealed)​
Elongation​: ≥20% (annealed)​
Hardness (HV)​: 130 – 170 (annealed); 210 – 260 (half-hard)​
Chemical Composition (Typical, %)​: Ni:43-45%
Surface Finish​: Bright annealed (Ra ≤0.2μm)​
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Company Info.
Huona (Shanghai) New Material Co., Ltd.
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CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components

Product Description​


CuNi44 Flat Wire
​
Product Advantages and Grade Distinctions​

CuNi44 flat wire stands out for its exceptional electrical resistance stability and mechanical workability, making it a superior choice for precision electrical components. Compared to similar copper-nickel alloys like CuNi10 (Constantan) and CuNi30, CuNi44 offers a higher resistivity (49 μΩ·cm vs. 45 μΩ·cm for CuNi30) and a lower temperature coefficient of resistance (TCR), ensuring minimal resistance drift in temperature-fluctuating environments. Unlike CuNi10, which excels in thermocouple applications, CuNi44’s balanced combination of formability and resistance stability makes it ideal for high-precision resistors, strain gauges, and current shunts. Its flat cross-section design further enhances heat dissipation and contact uniformity compared to round wires, reducing hot spots in high-current applications.​
Standard Designations​
  • Alloy Grade: CuNi44 (Copper-Nickel 44)​
  • UNS Number: C71500​
  • DIN Standard: DIN 17664​
  • ASTM Standard: ASTM B122​
Key Features​
  • Superior Resistance Stability: TCR of ±40 ppm/°C (-50°C to 150°C), outperforming CuNi30 (±50 ppm/°C) in precision applications.​
  • High Resistivity: 49 ± 2 μΩ·cm at 20°C, ensuring efficient current control in compact designs.​
  • Flat Profile Benefits: Increased surface area for better heat dissipation; improved contact with substrates in resistor manufacturing.​
  • Excellent Formability: Can be rolled to tight dimensional tolerances (thickness 0.05mm–0.5mm, width 0.2mm–10mm) with consistent mechanical properties.​
  • Corrosion Resistance: Resists atmospheric corrosion and freshwater exposure, suitable for harsh industrial environments.​
Technical Specifications​
​

Attribute​


Value​


Thickness Range​


0.05mm – 0.5mm​


Width Range​


0.2mm – 10mm​


Thickness Tolerance​


±0.001mm (≤0.1mm); ±0.002mm (>0.1mm)​


Width Tolerance​


±0.02mm​


Aspect Ratio (Width:Thickness)​


2:1 – 20:1 (custom ratios available)​


Tensile Strength​


450 – 550 MPa (annealed)​


Elongation​


≥20% (annealed)​


Hardness (HV)​


130 – 170 (annealed); 210 – 260 (half-hard)​





​
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​





​
Product Specifications​
​

Item​


Specification​


Surface Finish​


Bright annealed (Ra ≤0.2μm)​


Supply Form​


Continuous rolls (50m – 300m) or cut lengths​


Packaging​


Vacuum-sealed with anti-oxidation paper; plastic spools​


Processing Options​


Custom slitting, annealing, or insulation coating​


Compliance​


RoHS, REACH certified; material test reports available​





​
Typical Applications​
  • Precision wirewound resistors and current shunts​
  • Strain gauge grids and load cells​
  • Heating elements in medical devices​
  • EMI shielding in high-frequency circuits​
  • Electrical contacts in automotive sensors​
We provide tailored solutions for specific dimensional requirements. Free samples (1m lengths) and comparative performance data with CuNi30/CuNi10 are available upon request.
Product Tags:

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CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components

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