Konstantan (Constantan) Resistance Alloy
Konstantan is copper nickel electrical resistance alloy. Pure copper adds nickel which can increase strength, corrosion resistance, hardness, electric resistance and thermal electricity, and decrease electrical resistance temperature coefficient.
Feature
With low electrical resistance temperature coefficient, wider temmperature(<480℃), good workability and weldability. Besides Konstantn resistance alloy, we still have New Konstantan resistance alloy which is copper iron based alloy, their parameters are same. Compared with Konstantan, new Konstantan is cheaper, but oxidation resistance is worse than Konstantan.
Specification
| Konstantan (6J40) | New Konstantan (6J11) | Manganin 47 (6J12) | Manganin 37 (6J8) | Manganin 43 (6J13) | ||
| Chemical composition, % | Ni | 39.0~41.0 | – | 2.0~3.0 | – | 2.0~5.0 |
| Mn | 1.0~2.0 | 10.5~12.5 | 11.0~13.0 | 8.0~10.0 | 11.0~13.0 | |
| Cu | Bal | Bal | Bal | Bal | Bal | |
| Other | – | Al: 2.5~4.5 Fe: 1.0~1.6 | – | Si: 1.0~2.0 | – | |
| Working temperature, ℃ | 5-500 | 5-500 | 5-450 | 10-480 | 10-480 | |
| Density, T/m³ | 8.88 | 8.00 | 8.44 | 8.70 | 8.40 | |
| Resistivity .m, 20℃ | 0.48±0.03 | 0.48±0.03 | 0.46±0.03 | 0.35±0.05 | 0.44±0.04 | |
| Temperature coefficient aí10-6/℃ | +40 -40 | +80 -80 | +20 -3 | +10 -5 | 40 | |
| Thermoelectric potential of copper V/℃(0-100℃) | 45 | 2 | 1 | 2 | 2 | |
| Elongation, %(>0.5) | ≥15 | ≥15 | ≥15 | ≥15 | ≥15 | |
| Microstructure | Austenite | Austenite | Austenite | Austenite | Austenite | |
| Magnetism | Non-magnetic | Non-magnetic | Non-magnetic | Non-magnetic | Non-magnetic | |
Application
Electronic components in electronics and industry equipment.
Function in the design of regulated power supply: over-current protection, test load current.
Constantan is suitable for use in AC circuits, as precision resistor, sliding resistor, resistance strain gauge, etc., and also as thermocouple and thermocouple compensation wire materials.
