Karma 6J22 Precision Resistance Wire for Measuring Instruments and Electrical Components
6J22 is a nickel-chromium alloy with high electrical resistivity and a low temperature coefficient of resistance, making it ideal for precision resistors and strain gauges. It offers excellent corrosion resistance, especially in oxidizing environments, and maintains stable resistance up to high temperatures. Used in various measuring instruments and electrical components where temperature stability is crucial.
Karma Ni-Cr-Al-Fe 6J22/6J422 is a high-performance precision resistance wire that offers excellent thermal stability, corrosion resistance, and mechanical durability. It is ideal for industrial heating, temperature sensing, and resistive components in environments requiring consistent, long-term performance at elevated temperatures.
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 |
Propertises
| Name |
Code |
Resistivity(20℃)(μΩm) |
Temp.Coeff.Of Resistance (20℃)(α×10-6/℃) |
(0~100℃) Thermal EMF vs. Copper (μv/℃) |
Max. Working Temp. (℃) |
Elongation(%) |
Tensile Strength(N/mm2) |
Standard |
| Karma |
6J22 |
1.33±0.07 |
≤±20 |
≤2.5 |
≤300 |
＞7 |
≥780 |
JB/T 5328 |
The tolerance of wires diameter, size range
| |
Diameter (mm) |
Tolerance |
| 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 as per client's request. |
Kamar (6J22) Technical Data of wires
| Dia (mm) |
Cross-sectional area (mm2) |
Weight/meter (g/m) |
Resisitance/ meter at 20 ℃ (Ω/m) |
Dia (mm) |
Cross-sectional area (mm2) |
Weight/meter (g/m) |
Resisitance/ meter at 20 ℃ (Ω/m) |
| 0.018 |
0.000255 |
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 |
0.132 |
1.0692 |
9.57-10.57 |
| 0.040 |
0.001257 |
0.01018 |
953-1164 |
0.45 |
0.159 |
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 |
0.002380 |
0.01928 |
515.0-604.6 |
0.60 |
0.2827 |
2.2899 |
4.46-4.94 |
| 0.063 |
0.003120 |
0.02527 |
392.2-460.4 |
0.65 |
0.3318 |
2.6876 |
3.81-4.21 |
| 0.070 |
0.003850 |
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 |
0.012270 |
0.0994 |
111.7-123.5 |
0.95 |
0.7088 |
5.7413 |
1.79-1.97 |
| 0.140 |
0.015390 |
0.1247 |
82.08-90.72 |
1.00 |
0.7854 |
6.3617 |
1.60-1.77 |
| 0.150 |
0.017670 |
0.1431 |
71.51-79.03 |
1.10 |
0.9503 |
7.6974 |
1.33-1.47 |
| 0.160 |
0.020110 |
0.1629 |
62.84-69.46 |
1.12 |
0.9852 |
7.9801 |
1.28-1.42 |
| 0.170 |
0.022700 |
0.1839 |
55.66-61.52 |
1.18 |
1.0936 |
8.8582 |
1.16-1.28 |
| 0.180 |
0.025450 |
0.2061 |
49.65-54.88 |
1.20 |
1.313 |
9.1611 |
1.11-1.23 |
| 0.190 |
0.028350 |
0.2296 |
44.56-49.26 |
1.30 |
1.327 |
10.7487 |
0.95-1.05 |
| 0.200 |
0.031420 |
0.2545 |
40.22-44.45 |
1.40 |
1.539 |
12.466 |
0.82-0.90 |
| 0.212 |
0.035300 |
0.2859 |
35.80-39.56 |
1.50 |
1.767 |
14.3127 |
0.71-0.79 |
| 0.220 |
0.038010 |
0.3079 |
33.24-36.74 |
1.60 |
2.011 |
16.2891 |
0.63-0.69 |
Some key features of 6J22 include:
- High resistivity: The resistivity of 6J22 precision alloy is about three times higher than that of manganese copper, so it can be used to make high-precision electronic components.
- Low temperature coefficient of resistance: 6J22 precision alloy has a low temperature coefficient of resistance, which means that its resistance value changes less at different temperatures.
- Low thermoelectric potential to copper: 6J22 precision alloy has a low thermoelectric potential to copper, which means that there will not be too much thermoelectric effect during use.
- Good long-term stability of resistance: 6J22 precision alloy has good long-term stability of resistance and can maintain stable performance for a long time.
- Good oxidation resistance: 6J22 precision alloy has good oxidation resistance and can be used in high temperature environments for a long time.
- Wide operating temperature range: 6J22 precision alloy has a wider operating temperature range than manganese copper and can be used in a wider temperature range.
6J22 alloy is known for its outstanding corrosion resistance, high strength, thermal stability, and versatile applications across aerospace, chemical, and electronic industries. These attributes make it a reliable choice for demanding environments and applications.
Applications:
- Making precision resistance components: 6J22 alloy has high resistivity and temperature coefficient, so it is suitable for making precision resistance components in various measuring instruments and meters. For example, resistor sheets made of 6J22 alloy can be used to make precision measuring instruments such as resistor boxes and bridges.
- Making micro-resistance components and strain gauges: 6J22 alloy has good processing performance and mechanical properties, so it is suitable for making precision micro-resistance components and strain gauges. For example, micro resistors made of 6J22 alloy can be used to make micro sensors, micro electronic components, etc., while strain gauges can be used to make pressure sensors, strain measuring instruments, etc.
In addition, 6J22 alloy can also be used to make high-precision wires, springs, springs and other components, as well as high-precision instruments and equipment in aviation, aerospace, national defense and other fields.
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