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CuNi45 Constantan Ultra-Fine Round Wire, 0.32mm Diameter Low-Temperature Drift Copper-Nickel Alloy Wire for Precision Instrument & Medical Miniature Sensing Components
| Place of Origin | Shanghai |
|---|---|
| Brand Name | Huona |
| Certification | ISO 9001 |
| Model Number | CuNi45 |
| 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
| Attribute Typical Specification Alloy Designation | CuNi45 Micro Precision Grade Constantan (55Cu / 45Ni) | Standard Diameter | 0.32mm |
|---|---|---|---|
| Custom Diameter Range | 0.025mm ~ 2.2mm Ultra-Fine & Thin Gauges | Surface Treatment | Low-Tension Homogenization Soft Annealed, Mirror Polished, Fully Deburred Concentric Round Surface |
| Operating Temperature | -80°C ~ 350°C (Clean Dry Laboratory & Medical Low-Corrosion Atmosphere) | Reference Resistivity | 0.49 µΩ·m At 20°C Ambient Reference Temperature |
| Temperature Coefficient Of Resistance | Ultra-minimal Drift Within Full Precision Working Temperature Band | Processing Performance | Super Micro Ductility, Supports Ultra-tight Tiny-radius Winding, No Fracture After Repeated Fine Bending |
Product Description
Product Overview
This ultra-fine CuNi45 constantan solid wire is independently manufactured by HUONA with exclusive 55Cu-45Ni alloy ratio, specially customized for high-precision laboratory instruments, portable testing devices and medical miniature temperature sensing assemblies, distinct from thick-gauge CuNi45 wire for power shunt use and standard CuNi44 constantan wire. It adopts multi-stage micro precision drawing and low-tension full soft homogenization annealing process, featuring ultra-uniform concentric circular cross-section, flawless oxide-free mirror metallic surface, ultra-low resistance temperature drift and superior micro bending pliability. Neatly layered and compactly wound on grid-rim heavy-duty black plastic spools as shown in the picture, the grid flange design prevents wire slipping during low-speed precision winding operations. It serves as core raw material for micro precision balancing resistors, miniature medical temperature probes and lightweight portable Type J/T thermocouple negative conductors that demand tiny wire size and stable ultra-precise electrical output.
Core Specifications
Product Name: CuNi45 Ultra-Fine Gauge Constantan Solid Round Wire for Precision Instrument
Alloy Grade: CuNi45 Constantan Alloy (55% Copper + 45% Nickel, differentiated from CuNi44 and thick-size CuNi45 power-grade wire)
Processing Technology: Multi-pass micro ultra-fine wire drawing + low-tension homogenization soft annealing + superfine surface deburring & polishing
Standard Specification: 0.32mm Nominal Diameter
Customizable Size Range: Diameter 0.025mm–2.2mm ultra-fine to thin medium gauges
Surface Condition: High-gloss silver mirror finish, perfect round concentricity, free of burrs, scratches and surface discoloration
Electrical Performance: Stable inherent volume resistivity, minimal resistance fluctuation under slight ambient temperature changes
Operating Temperature Range: -80°C ~ 350°C (continuous stable service under clean dry low-corrosion laboratory & medical environments)
Standards Compliance: IEC 60584, GB/T 6149, RoHS 2.0, REACH eco-friendly non-toxic material certification
Key Differentiating Advantages
1. Tuned 55Cu-45Ni Micro-Grade Alloy for Ultra-Precision Instrument Circuits
Different from heavy-load thick CuNi45 and conventional CuNi44 grades, this micro-fine wire adopts refined low-impurity smelting technology to optimize grain fineness for miniature precision circuits. The homogenized metallographic structure delivers near-zero temperature coefficient of resistance under mild temperature variation, maintaining fixed resistance readings for high-accuracy instrument calibration. Consistent alloy composition across every batch eliminates tiny resistance tolerance errors critical for laboratory measuring equipment production.
2. Ultra-Stable Thermoelectric Output for Portable & Medical Mini Thermoprobes
As a specialized negative matching alloy for compact Type J and Type T thermocouples, this thin CuNi45 wire generates highly repeatable linear thermal voltage signals when paired with iron or copper positive wires. Its ultra-slim diameter supports manufacturing of miniature disposable medical temperature probes and palm-sized portable test sensors, which fit narrow body contact spaces and deliver steady low-deviation temperature data without signal drift.
3. Low-Tension Annealed Ultra-Soft Texture for Micro Precision Winding
Full soft homogenization annealing removes all internal tensile stress generated during ultra-fine drawing, granting the wire exceptional flexibility to withstand ultra-small radius coiling, micro cutting and layered fine winding without rebound, cracking or diameter distortion. Uniform circular cross-section ensures even tension distribution during precision manual and automated micro winding, stabilizing electrical balance of miniature instrument resistance coils.
4. Grid-Rim Spool Anti-Slip Winding Design for Precision Processing
The ultra-fine CuNi45 wire is orderly wound on grid-structured flange black plastic spools; the grid rim effectively blocks thin wire sliding off the reel during slow precision unwinding for laboratory component production. Clear label blank area on spool hub enables easy specification and batch marking for strict instrument factory traceability, while polished wire surface avoids metal abrasion against delicate winding machine guide components.
5. Clean Low-Corrosion Performance Suitable for Medical & Lab Scenarios
The CuNi45 copper-nickel alloy features mild oxidation resistance in clean dry air, without generating harmful metal oxide precipitates that interfere with precision measurement. It retains stable mechanical and electrical properties under frequent low-to-medium temperature cycles inside sealed testing equipment and medical sensing devices, extending service life of delicate miniature measuring components without performance attenuation.
Technical Specifications Table
| Attribute | Typical Specification |
|---|---|
| Alloy Designation | CuNi45 Micro Precision Grade Constantan (55Cu / 45Ni) |
| Standard Diameter | 0.32mm |
| Custom Diameter Range | 0.025mm ~ 2.2mm Ultra-Fine & Thin Gauges |
| Surface Treatment | Low-Tension Homogenization Soft Annealed, Mirror Polished, Fully Deburred Concentric Round Surface |
| Operating Temperature | -80°C ~ 350°C (Clean Dry Laboratory & Medical Low-Corrosion Atmosphere) |
| Reference Resistivity | 0.49 µΩ·m at 20°C ambient reference temperature |
| Temperature Coefficient of Resistance | Ultra-minimal drift within full precision working temperature band |
| Processing Performance | Super micro ductility, supports ultra-tight tiny-radius winding, no fracture after repeated fine bending |
Supply & Packaging Standard
Supply Form: Continuous ultra-fine solid CuNi45 wire neatly layered on grid-rim black industrial plastic spools; standard full-length reels and custom short-cut small precision coils are both available
Packaging: Each spool individually sealed with dust-free anti-oxidation plastic bag plus soft shock-absorbing foam padding, suitable for clean room laboratory production supply and lightweight cross-border export shipping
MOQ: 1 grid-rim black spool for small-batch precision instrument prototype testing; large-volume bulk supply for medical sensor factories, laboratory measuring instrument manufacturers and portable test equipment component producers
Customization Service: Custom ultra-fine wire diameter, single spool winding length, annealing softness grade and surface polishing smoothness based on miniature precision resistance coil and medical micro thermoprobe production demands
Typical Application Scope
High-Precision Instrument Balancing Resistor Winding: Core raw material for ultra-low drift miniature balance resistors used in laboratory precision measuring circuits and calibration equipment.
Miniature Medical Thermocouple Negative Leg Fabrication: Slim matching negative alloy wire for disposable small-size Type J & Type T body contact temperature sensing probes.
Portable Test Equipment Sensing Components: Stable resistive wire for palm-sized thermal testing analyzers, handheld temperature detection meters and compact field calibration fixtures.
Micro Precision Electronic Control Assemblies: Low-drift fine resistance coils for tiny portable analytical instruments and bench-top laboratory thermal adjustment modules.
Clean-Environment Mini Thermal Detection Parts: Ultra-thin temperature measuring wire for sealed lab test chambers, compact analytical devices and non-invasive medical thermal monitoring assemblies.
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