Constantan wire
Constantan: It is mainly composed of copper and nickel. It has a low resistance temperature coefficient, a wide operating temperature range (below 500 ℃), good machinability, corrosion resistance and brazing. It can make variable resistance and strain resistance elements in AC instruments.
Chemical composition
Name | Grade | Mainly composition% | Executive Standard |
Cu | Mn | Ni | Cr |
Constantan | 6J40 | Bal. | 1~2 | 39~41 | - | GB/T6145-2010 |
Product performance
Name | Grade | Resistivity（μΩ.m） | Temperature coefficient of resistance(℃) | Thermoelectric potential for Cu (0~100℃) | Maximum
service
temperature of wire(℃) | Elongation(%) | Tensile strength (N/mm2) | Executive
Standard |
Constantan | 6J40 | 0.48±0.03 | ≤±40 | 45 | ≤500 | ≥15 | ≥390 | GB/T6145-2010 |
Product size and tolerance
Diameter(mm) | 0.02~ 0.028 | 0.032~ 0.0 | 0.112~ 0.28 | 0.135~ 0.50 | 0.56~ 1.0 | 1.06~ 1.60 | 1.70~ 2.12 | 2.24~ 3.00 | 3.15~ 4.50 | Executive Standard |
Tolerance(mm) | ±0.002 | ±0.003 | ±0.005 | ±0.010 | ±0.015 | 0.020 | ±0.025 | ±0.030 | ±0.035 | GB/T6145-2010 |
