Constantan Alloy 6J40 Copper Nickel Foil with High Electrical Resistivity Low TCR and Excellent Corrosion Resistance for Precision Resistors
Price:
20-35USD /Kg
MOQ:
30Kg
Delivery Time:
15-30days
Brand:
Tankii
Product Description
Constantan Alloy 6J40 Copper Nickel Foil / Ultra-thin Resistance Strip
Constantan 6J40 (also known as CuNi40, CuNi44, NC50, Eureka, Konstantan, or Cuprothal) is a copper-nickel precision resistance alloy containing approximately 40-44% nickel. It is characterized by high electrical resistivity, low temperature coefficient of resistance (TCR), and excellent corrosion resistance. The ultra-thin foil and strip forms are specifically designed for precision resistors, strain gauges, and shunt applications.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 39 - 44% |
| Manganese (Mn) | 1.0 - 2.0% |
| Copper (Cu) | Balance |
| Iron (Fe) | ≤0.5% |
| Silicon (Si) | ≤0.5% |
| Cadmium (Cd) | ND (Not Detected) |
| Lead (Pb) | ND |
| Mercury (Hg) | ND |
| Chromium (Cr) | ND |
Physical & Electrical Properties
| Property | Value |
|---|---|
| Electrical Resistivity (20°C) | 0.48 - 0.49 μΩ·m (48-49 μΩ·cm)
|
| Temperature Coefficient of Resistance (TCR) | ±20 to ±40 ppm/°C (adjustable through heat treatment)
|
| Maximum Continuous Service Temperature | 400°C
|
| Density | 8.9 g/cm³
|
| Melting Point | 1280°C |
| Thermal EMF vs. Copper (0-100°C) | -43 μV/°C
|
| Thermal Conductivity | 21.2 - 23 W/m·K
|
| Thermal Expansion Coefficient (20-100°C) | 14.9 - 15 × 10⁻⁶/°C
|
| Specific Heat | 0.41 J/g·K |
Mechanical Properties
| Condition | Tensile Strength | Elongation |
|---|---|---|
| Annealed (Soft) | 340 - 535 MPa | ≥25%
|
| Cold Rolled | 680 - 1070 MPa | ≥2%
|
| Typical Yield Strength | 250 MPa | - |
Key Applications
-
Precision foil resistors and chip resistors
-
Strain gauges and load cells
-
Current sensing shunts and ammeter shunts
-
Thermocouple compensation wires (Type J and Type T negative element)
-
Potentiometers and industrial rheostats
-
Temperature-stable resistors for instrumentation
-
Heating elements and heating cables
-
Bimetal heating applications
-
Aerospace and industrial electronic
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Company
Shanghai Tankii Alloy Material Co.,Ltd
Location
1900 Mudanjiang Road, Baoshan District, 201999, Shanghai, China
Contact Person
Martin Lee