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CuNi44 Constantan Solid Round Wire, 0.80mm Diameter High Stability Copper-Nickel Alloy Wire for Precision Resistance & Thermocouple Applications
| Place of Origin | Shanghai |
|---|---|
| Brand Name | Huona |
| Certification | ISO 9001 |
| Model Number | CuNi44 |
| Minimum Order Quantity | 5KG |
| Price | Negotiable |
| Packaging Details | Carton/Wooden Case |
| Delivery Time | 5-21 days |
| Payment Terms | L/C,T/T,Western Union |
| Supply Ability | 500 tons per month |
Product Details
| Alloy Grade | CuNi44 Constantan (56Cu / 44Ni) | Standard Diameter | 0.80mm |
|---|---|---|---|
| Custom Diameter Range | 0.05mm ~ 3.0mm | Surface Treatment | Stress-Relief Bright Annealed, Mirror Polished, Burr-Free |
| Operating Temperature | -60°C ~ 400°C (Dry Industrial Atmosphere) | Nominal Resistivity | 0.48 µΩ·m (20°C Reference) |
| Temperature Coefficient Of Resistance | Near-zero Low Drift Within -60°C ~ 400°C | Processing Performance | High Ductility, Tight Winding Capable, No Fracture After Repeated Bending |
Product Description
Product Overview
This premium CuNi44 constantan round wire is manufactured by Huona with strictly controlled copper-nickel 56/44 alloy ratio, designed for precision electrical resistance components and thermocouple negative conductor manufacturing. Produced via multi-pass fine drawing and uniform stress-relief bright annealing processes, this solid round wire delivers ultra-consistent resistivity, low temperature coefficient of resistance, smooth burr-free metallic surface and outstanding ductility. Tightly wound on heavy-duty large black industrial plastic spools as shown in the picture, it supports long-length continuous unwinding, perfectly suited for resistor winding, strain gauge fabrication, and pairing with iron or nickel-chromium alloys to form standard temperature sensing thermocouple assemblies.
Core Specifications
Product Name: CuNi44 High Stability Constantan Solid Round Wire
Conductor Material: CuNi44 (56% Copper + 44% Nickel Constantan Alloy)
Processing Technology: Multi-pass precision wire drawing + full stress-relief bright annealing + surface finishing
Standard Specification: 0.80mm Nominal Diameter
Customizable Size Range: Diameter 0.05mm – 3.0mm
Surface Condition: Bright polished silver metallic surface, uniform roundness, free of burrs, scratches and oxidation spots
Electrical Performance: Stable volume resistivity, ultra-low temperature resistance drift across wide temperature bands
Operating Temperature Range: -60°C ~ 400°C (continuous stable operation under dry atmospheric environments)
Standards Compliance: IEC 60584, GB/T 6149, RoHS 2.0, REACH environmental compliance standards
Key Differentiating Advantages
1. Precise 56Cu-44Ni Alloy Composition for Ultra-Stable Resistivity
This CuNi44 wire adopts accurately proportioned copper and nickel raw materials with strict impurity limitation during smelting. The balanced alloy microstructure achieves an extremely low temperature coefficient of resistance, maintaining nearly consistent electrical resistance value as ambient temperature fluctuates. Batch-to-batch alloy consistency eliminates resistance deviation during mass winding of precision resistors and sensing components.
2. Excellent Thermoelectric Matching Performance for Thermocouple Pairs
CuNi44 constantan serves as the standard negative leg for Type J and Type T thermocouple systems. It features predictable, linear thermoelectric voltage output when paired with iron or copper positive conductors, delivering reliable repeatable temperature signal transmission for industrial temperature probes and thermal measurement equipment.
3. Superior Ductility & Uniform Roundness for Precision Winding
Stress-relief annealing removes internal drawing residual stress, granting the wire outstanding softness and bending resistance. It withstands tight small-radius winding, fine coiling and micro-cutting without springback, fracture or diameter deformation. Consistent circular cross-section ensures even winding tension and uniform resistance distribution across finished resistor coils.
4. Large Spool Long-Length Packaging Boosts Production Efficiency
The wire is wound onto heavy-duty large-capacity black plastic spools with huge continuous length per reel, minimizing splicing breaks during automated winding production lines. The smooth polished surface prevents abrasion during high-speed unwinding, while marked spool hubs allow clear specification identification for warehouse management and batch tracking.
5. Reliable Anti-Corrosion & Long-Term Electrical Stability
CuNi44 alloy exhibits decent resistance against dry air oxidation and mild atmospheric erosion. It maintains stable mechanical and electrical properties under long-duration cyclic temperature changes, resisting performance aging to extend the service life of resistive elements and temperature sensing wires in general industrial environments.
Technical Specifications Table
| Attribute | Typical Specification |
|---|---|
| Alloy Grade | CuNi44 Constantan (56Cu / 44Ni) |
| Standard Diameter | 0.80mm |
| Custom Diameter Range | 0.05mm ~ 3.0mm |
| Surface Treatment | Stress-Relief Bright Annealed, Mirror Polished, Burr-Free |
| Operating Temperature | -60°C ~ 400°C (Dry Industrial Atmosphere) |
| Nominal Resistivity | 0.48 µΩ·m (20°C Reference) |
| Temperature Coefficient of Resistance | Near-zero low drift within -60°C ~ 400°C |
| Processing Performance | High ductility, tight winding capable, no fracture after repeated bending |
Supply & Packaging Standard
Supply Form: Continuous solid round CuNi44 wire densely wound on large heavy-duty black industrial plastic spools; standard full-length large reels and custom cut-to-length small coils available
Packaging: Each large spool wrapped with dust-proof moisture-proof outer packaging plus shockproof protective padding, optimized for bulk factory procurement and long-distance export transportation
MOQ: 1 large black spool for sample trial winding; massive bulk supply for resistor manufacturers, thermocouple sensor factories and electronic component producers
Customization: Custom wire diameter, single spool winding length, annealing hardness and surface finish according to precision resistor and thermocouple production requirements
Typical Application Scope
Precision Resistor Winding: Core raw material for manufacturing low-drift precision wound resistors, shunt resistors and load resistance coils.
Thermocouple Negative Conductor Production: Negative alloy leg for Type J and Type T industrial temperature sensing wires and contact probes.
Strain Gauge & Testing Instrument Components: Stable resistive wire for laboratory measuring equipment, strain detection modules and electrical calibration fixtures.
Electronic Heating Control Elements: Low-drift resistance coils for small precision temperature adjustment modules and electronic thermal regulators.
General Electrical Resistance Components: Long-life resistive wire for household appliance control circuits, automation equipment signal balancing parts.
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