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, %Ni39.0~41.0-2.0~3.0-2.0~5.0
Mn1.0~2.010.5~12.511.0~13.08.0~10.011.0~13.0
CuBalBalBalBalBal
Other-Al: 2.5~4.5
Fe: 1.0~1.6
-Si: 1.0~2.0-
Working temperature, ℃5-5005-5005-45010-48010-480
Density, T/m³8.8888.448.78.4
Resistivity .m, 20℃0.48±0.030.48±0.030.46±0.030.35±0.050.44±0.04
Temperature coefficient, aí10-6/℃+40
-40
+80
-80
+20
-3
+10
-5
40
Thermoelectric potential of copper, V/℃(0-100℃)452122
Elongation, %(>0.5)≥15≥15≥15≥15≥15
MicrostructureAusteniteAusteniteAusteniteAusteniteAustenite
MagnetismNon-magneticNon-magneticNon-magneticNon-magneticNon-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.