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Constantan-type electric resistance

Constantan is a type of resistance alloy, which is made up of copper and nickel as the main components. It has a low temperature coefficient of resistance (TCR), and a wide operating temperature range (below 500 ℃ ). It has good properties on mechanical working, high resistance of corrosion. It is used for variable and strain resistance elements in alternative instruments.
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  • 6J40
  • REOU
Constantan-type
Constantan is a type of resistance alloy, which is made up of copper and nickel as the main components. It has a low temperature coefficient of resistance (TCR), and a wide operating temperature range (below 500 ℃ ). It has good properties on mechanical working, high resistance of corrosion. It is used for variable and strain resistance elements in alternative instruments.

Name
Code
Main Composition(%)
Density
Cu
Mn
Ni
Cr
g/mm²
Constantan
6J40
Bal.
1~2
39~41
--
8.9
Properties
Name
Type
(20℃) Resistivity (μΩ.m)
(20℃) Temp. Coeff. Of Resistance (αX10-6/℃
(0~100℃) Thermal EMF vs. Copper (μv/℃
Max.working Temp.(℃)
Elongation (%)
Tensile Strength (N/mm2)
Constantan
6J40
0.48±0.03
≤±40
45
≤500
≥15
≥390
Diameter and Tolerance
Dia(mm)
0.02~0.028
0.032~0.10
0.112~0.28
0.315~0.50
0.56~1.0
1.06~1.60
1.70~2.12
2.24~3.00
3.15~4.50
Tolearance(mm)
±0.002
±0.003
±0.005
±0.010
±0.015
±0.020
±0.025
±0.030
±0.035


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