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CuNi44 Constantan Extra-Fine Round Wire, 0.25mm Diameter Alloy CW50600 Ultra-Thin Copper Nickel Wire for Micro Precision Circuit & Tiny Thermosensor Manufacturing
| 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 Designation | Domestic CuNi44 / International CW50600 Constantan (56Cu / 44Ni) | Standard Diameter | 0.25mm |
|---|---|---|---|
| Custom Diameter Range | 0.02mm ~ 2.0mm Ultra-Fine & Thin Gauges | Surface Treatment | Low-Tension Full Soft Annealed, Mirror Polished, Fully Deburred Round Surface |
| Operating Temperature | -75°C ~ 360°C (Dry Low-Corrosion Microelectronic Working Atmosphere) | Reference Resistivity | 0.48 µΩ·m Under 20°C Reference Temperature |
| Temperature Coefficient Of Resistance | Ultra-low Drift Value Across The Full Service Temperature Range | Processing Performance | Super High Micro Ductility, Supports Ultra-tight Tiny-radius Winding, No Fracture After Repeated Micro Bending |
Product Description
Product Overview
This ultra-fine CuNi44 constantan solid wire is independently produced by Huona, corresponding to international alloy code CW50600 with standardized 56Cu-44Ni composition, specially developed for micro-sized electronic resistive elements and ultra-miniature thermocouple negative conductors. It adopts multi-pass ultra-fine wire drawing and full low-tension soft annealing processing, delivering ultra-consistent circular dimension, mirror scratch-free metallic finish, ultra-low resistance temperature coefficient and outstanding micro bending ductility. Uniformly layered and compactly wound on flat-rim black industrial plastic spools as shown in the picture, the neat winding layout avoids wire knotting during ultra-high-speed micro winding procedures. It acts as core raw material for micro chip resistors, ultra-small strain gauges and slim built-in temperature probes used in precision microelectronic devices.
Core Specifications
Product Name: CuNi44 CW50600 Extra-Fine Gauge Constantan Solid Round Wire
Alloy Grade: Domestic standard CuNi44 / Global CW50600 constantan alloy (56% Copper + 44% Nickel)
Processing Technology: Multi-stage ultra-fine precision drawing + low-tension full soft annealing + superfine surface polishing & deburring
Standard Specification: 0.25mm Nominal Diameter
Customizable Size Range: Diameter 0.02mm–2.0mm ultra-fine to medium thin gauges
Surface Condition: Glossy silver mirror finish, perfect concentric roundness, free of burrs, oxidation stains and longitudinal scratches
Electrical Performance: Stable fixed resistivity, negligible resistance variation under fluctuating ambient temperature
Operating Temperature Range: -75°C ~ 360°C (continuous stable operation in dry low-corrosion industrial environments)
Standards Compliance: IEC 60584, GB/T 6149, RoHS 2.0, REACH eco-friendly material certification
Key Differentiating Advantages
1. Purified Dual-Standard Alloy Composition for Micro Resistance Stability
This extra-fine wire uses high-purity smelted CuNi44 alloy matching both domestic industry standards and international CW50600 specifications, with strict control over trace impurity elements. Its uniform metallographic structure achieves nearly zero temperature coefficient of resistance, keeping fixed electrical resistance values when temperature rises or falls, and maintains consistent performance between different production batches to reduce calibration work for micro resistor mass production.
2. Optimized Thermoelectric Matching for Ultra-Small Temperature Sensors
As the designated negative alloy leg of Type J and Type T thermocouple systems, CW50600 constantan can generate highly linear thermoelectric voltage signals after pairing with iron or copper positive wires. The ultra-thin wire diameter supports fabrication of slim embedded temperature probes, which can be installed into tiny equipment cavities and deliver repeatable low-deviation temperature detection signals for micro thermal monitoring modules.
3. Low-Tension Annealed Texture for Complex Micro Forming
Full soft annealing under low tension thoroughly eliminates internal tensile stress generated during ultra-fine drawing, endowing the wire with superior softness and anti-rebound performance. It can withstand ultra-miniature radius winding, micro precision cutting and compact coiling without fracture, splitting or diameter distortion. Uniform circular cross-section ensures even tension during automatic micro winding, distributing resistance evenly on micro resistor coils to stabilize finished circuit electrical performance.
4. Flat-Rim Spool Neat Winding Optimized for Micro Winding Equipment
The extra-fine CuNi44 wire is evenly layered on flat-rim black plastic spools with orderly dense winding, which effectively prevents thin wire tangling during high-speed automatic coiling. The wide flat spool edge avoids wire slipping off during long-time continuous unwinding, and side label positions enable quick batch and specification identification for warehouse stock sorting and production traceability. The polished wire surface prevents metal abrasion when sliding through winding machine guide holes.
5. Mild Dry-Air Anti-Oxidation Property for Long-Term Micro Component Service
CW50600 copper-nickel alloy has stable anti-oxidation capacity under dry low-to-medium temperature environments. It will not easily form thick oxide films during repeated short temperature cycles, avoiding gradual resistance drift and signal attenuation, thus extending the service cycle of micro resistive components and ultra-thin thermocouple wires in precision electronic and light industrial equipment.
Technical Specifications Table
| Attribute | Typical Specification |
|---|---|
| Alloy Designation | Domestic CuNi44 / International CW50600 Constantan (56Cu / 44Ni) |
| Standard Diameter | 0.25mm |
| Custom Diameter Range | 0.02mm ~ 2.0mm Ultra-Fine & Thin Gauges |
| Surface Treatment | Low-Tension Full Soft Annealed, Mirror Polished, Fully Deburred Round Surface |
| Operating Temperature | -75°C ~ 360°C (Dry Low-Corrosion Microelectronic Working Atmosphere) |
| Reference Resistivity | 0.48 µΩ·m under 20°C reference temperature |
| Temperature Coefficient of Resistance | Ultra-low drift value across the full service temperature range |
| Processing Performance | Super high micro ductility, supports ultra-tight tiny-radius winding, no fracture after repeated micro bending |
Supply & Packaging Standard
Supply Form: Continuous ultra-fine solid CuNi44 wire neatly and densely wound on flat-rim medium black industrial plastic spools; standard full-length reels and custom short-cut small coil orders are both acceptable
Packaging: Each single spool is individually packed with dust-proof sealed bag plus shock-absorbing foam buffer, suitable for light bulk cross-border transportation and long-term clean indoor warehouse storage
MOQ: 1 flat-rim black spool for small-batch micro winding prototype testing; large-volume bulk supply for micro resistor manufacturers, ultra-miniature thermosensor factories and precision microelectronic component suppliers
Customization Service: Custom ultra-fine wire diameter, single spool winding total length, annealing softness level and surface gloss finish according to micro resistance coiling and slim embedded temperature probe production requirements
Typical Application Scope
Ultra-Miniature Precision Wound Resistor Production: Core raw material for micro low-drift wound resistors, tiny shunt resistors and compact load resistance coils used in miniature circuit boards.
Ultra-Thin Thermocouple Negative Conductor Fabrication: Matching negative alloy wire for slim-diameter Type J & Type T sensing wires and embedded micro surface contact temperature probes.
Micro Strain Detection Instrument Parts: Stable resistive wire for desktop micro laboratory test equipment, miniature strain sensing modules and precision electrical calibration fixtures.
Micro Electronic Thermal Control Assemblies: Low-drift resistance coils for tiny portable temperature adjustment modules and micro semiconductor thermal testing fixtures.
Light Industry Miniature Electrical Resistance Components: Long service life resistive wire for compact small appliance control circuits and micro automation equipment signal balancing assemblies.
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