CuNi44 Constantan Solid Round Wire, 0.80mm Diameter High Stability Copper-Nickel Alloy Wire for Precision Resistance & Thermocouple Applications

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.

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

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.

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.

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.

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.

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.

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

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.