Karma Resistance Wire (Ni-Cr-Al-Fe)

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The karma resistance wire (Ni-Cr-Al-Fe), as its name implements, is mainly made of copper, nickel, aluminum and iron. It has a wider working temperature range from -60 to 300℃ and three times higher resistivity than the manganin product. In addition, the wire offers low temperature coefficient of resistance (TCR), low thermal EMF against copper, as well as great anti-oxidation property and long term stability of resistance. Typically, it is used for making precision micro resistance elements and strain foils.

Chemical Composition
Name Code Main Composition (%) Density (g/mm2) Standard
Cr Al Fe Ni
Karma 6J22 19~21 2.5~3.2 2.0~3.0 bal. 8.1 JB/T 5328

Product Properties
Code (20℃)
Resistivity
(μΩ.m)
(20℃)
Temp. Coeff. of Resistance
(αX10-6/℃)
(0~100℃)
Thermal EMF against Copper
(μv/℃)
Max. Working Temp. (℃) Elongation (%) Tensile Strength (N/mm2) Standard
6J22 1.33±0.07 ≤±20 ≤2.5 ≤300 >7 ≥780 JB/T 5328

Technical Data
Dia. (mm) Cross-sectional area (mm2) Weight/Meter
(g/m)
Resistance/Meter at 20℃ (Ω/m) Dia. (mm) Cross-sectional area (mm2) Weight/Meter
(g/m)
Resistance/Meter at 20℃ (Ω/m)
0.018 0.0002550 0.002066 4707-5749 0.25 0.04909 0.3976 25.74-28.45
0.020 0.000314 0.002543 3810-4657 0.28 0.06158 0.4988 20.52-22.68
0.022 0.000380 0.003078 3149-3849 0.30 0.07069 0.5726 17.87-19.76
0.025 0.000491 0.003977 2439-2980 0.32 0.07548 0.6114 16.74-18.5
0.028 0.000616 0.00499 1944-2376 0.33 0.08553 0.6928 14.78-16.33
0.030 0.000707 0.005727 1750-2015 0.38 0.1134 0.9185 11.13-12.31
0.032 0.000804 0.006512 1488-1819 0.40 0.1257 1.0182 10.05-11.11
0.035 0.000962 0.007792 1244-1521 0.41 0.1320 1.0692 9.57-10.57
0.040 0.001257 0.01018 953-1164 0.45 0.1590 1.288 7.94-8.77
0.045 0.001590 0.01288 752.6-919.9 0.50 0.1963 1.590 6.43-7.11
0.050 0.001963 0.0159 609.6-745.1 0.55 0.2376 1.9246 5.32-5.88
0.055 0.00238 0.01928 515.0-604.6 0.60 0.2827 2.2899 4.46-4.94
0.063 0.00312 0.02527 392.2-460.4 0.65 0.3318 2.6876 3.81-4.21
0.070 0.00385 0.03119 317.9-373.2 0.70 0.3848 3.1169 3.27-3.62
0.080 0.005027 0.0407 243.4-285.8 0.75 0.4418 3.5786 2.85-3.16
0.090 0.006362 0.0515 192.3-225.8 0.80 0.5027 4.0719 2.51-2.77
0.100 0.007854 0.0636 155.8-182.9 0.85 0.5674 4.5959 2.22-2.45
0.110 0.009852 0.0798 128.8-151.1 0.90 0.6362 5.1532 1.98-2.19
0.120 0.01227 0.0994 111.7-123.5 0.95 0.7088 5.7413 1.79-1.97
0.140 0.01539 0.1247 82.08-90.72 1.00 0.7854 6.3617 1.60-1.77
0.150 0.01767 0.1431 71.51-79.03 1.10 0.9503 7.6974 1.33-1.47
0.160 0.02011 0.1629 62.84-69.46 1.12 0.9852 7.9801 1.28-1.42
0.170 0.02270 0.1839 55.66-61.52 1.18 1.0936 8.8582 1.16-1.28
0.180 0.02545 0.2061 49.65-54.88 1.20 1.313 9.1611 1.11-1.23
0.190 0.02835 0.2296 44.56-49.26 1.30 1.327 10.7487 0.95-1.05
0.200 0.03142 0.2545 40.22-44.45 1.40 1.539 12.466 0.82-0.90
0.212 0.03530 0.2859 35.80-39.56 1.50 1.767 14.3127 0.71-0.79
0.220 0.03801 0.3079 33.24-36.74 1.60 2.011 16.2891 0.63-0.69

Size Range
Wire Diameter and Tolerance

Diameter (mm) Tolerance (mm)
Wires 0.018~0.025 ±0.001
0.028~0.055 ±0.003
0.070~0.14 ±0.004
0.16~0.20 ±0.005
0.22~0.25 ±0.006
0.28~0.30 ±0.007
0.32~0.40 ±0.01
0.41~0.50 ±0.015
0.55~0.80 +0.02/-0.03
0.85~1.00 +0.02/-0.03
1.10~1.50 ±0.03

Note: special specification can be produced according to client's request.

As a specialized Karma resistance wire (Ni-Cr-Al-Fe) manufacturer and supplier in China, Senphus also provides Cu-CuNi (constantan) thermocouple wire (type T), cabinet heater, silicone rubber heating pad, and PVC heating wire, among others.

Related Names:
Karma Type Alloy Wire | High Resistivity Wire

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