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6J40 Constantan Copper-Nickel Alloy Optimal Choice For Stable Electrical Properties

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6J40 Constantan Copper-Nickel Alloy Optimal Choice For Stable Electrical Properties

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Brand Name : Senphus

Model Number : 6J40/6J40X/6J40P/6J40D

Place of Origin : China

MOQ : 5kg

Price : --

Payment Terms : T/T, D/P

Supply Ability : 30 Tons per day

Delivery Time : 3 days

Packaging Details : Packed with waterproof paper or weave bag, into pallets or wooden case. Special packaging requirements can also be accommodated.

Place of Orig : Jiangsu, China

Type : Constantan

Application : Variable Resistor and Strain Sensor

Color : Silvery White

Certification : ISO9001

Product name : 6J40 Constantan Wire

Dessity : 8.9g/mm

Temp. Coeff. of resistance : -40~40

Max. working Temp. : 500

Elongation : ≥15

Tensile Strength : ≥390

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6J40 Constantan Copper-Nickel Alloy The Optimal Choice for Stable Electrical Properties

A constant alloy is a type of metal alloy designed to maintain stable and consistent properties, particularly electrical resistance, over a wide range of temperatures. The most well-known constant alloy is Constantan, a copper-nickel alloy that is widely used in temperature sensors (thermocouples), resistors, and heating elements due to its stable electrical and thermal characteristics.

Constant alloys, like 6J40, are valued for their reliable and consistent performance in a wide range of applications. Their ability to maintain stable electrical resistance and durability under varying environmental conditions makes them essential in industries like electronics, manufacturing, and scientific instrumentation.

Chemical composition

Name Code Main Composition(%) Density
Cu Mn Ni Cr g/mm2
Constantan 6J40 Bal. 1~2 39~41 -- 8.9

Properties

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)
Constantan 6J40 0.48±0.03 -40~+40 45 ≤500 ≥15 ≥390

Diameter and Tolerance

Diameter 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
Tolerance ±0.002 ±0.003 ±0.005 ±0.010 ±0.015 ±0.020 ±0.025 ±0.030 ±0.035

Some key features of 6J40 include:

  • Stable Electrical Resistance:

  • Constantan (commonly an alloy of 55% copper and 45% nickel) maintains constant electrical resistance across a wide range of temperatures. This property makes it particularly useful in applications requiring precise and stable resistance, such as in thermocouples (temperature sensors) and resistors.

  • 2. Low Temperature Coefficient of Resistance:

  • The alloy's resistance does not change much with temperature fluctuations. This low temperature coefficient ensures that devices made from constant alloys will maintain stable performance even in environments with varying temperatures.

  • 3. Good Corrosion Resistance:

  • Constant alloys, especially Constantan, have good corrosion resistance, making them durable for long-term use in harsh environments. This is essential in outdoor and industrial applications where exposure to moisture, chemicals, or high humidity is common.

  • 4. Thermoelectric Properties:

  • Due to its stable electrical resistance, Constantan is widely used in thermocouples to measure temperature. The difference in voltage generated by two different metals (like Constantan and another metal) when exposed to heat is used in these sensors to provide accurate temperature readings.
  • Thermoelectric Seebeck Coefficient: Constantan has a good Seebeck coefficient, which means it can generate a voltage that is proportional to the temperature difference across the metal, making it ideal for temperature measurement.

  • 5. Durability and Strength:

  • Constant alloys are relatively strong and resistant to mechanical wear. Their tensile strength and mechanical stability make them useful in applications that require durability, such as in electrical cables, resistance wire, and heating elements.

  • 6. Formability and Ductility:

  • Constant alloys are generally ductile and can be easily drawn into thin wires or formed into various shapes without losing their properties. This makes them versatile for use in a wide variety of applications, from precision resistors to wire-wound heating elements.

  • 7. High Melting Point:

  • Constant alloys typically have high melting points, allowing them to withstand high temperatures without degradation. This property is especially useful in heating elements (like those in ovens, toasters, and industrial furnaces) that require stable performance under heat stress.

  • 8. Magnetic Properties:

  • Constantan and similar alloys typically have non-magnetic properties, which makes them useful in applications where magnetic interference needs to be avoided, such as in sensitive electronic equipment or instrumentation.

Applications:

  • Thermocouples: Constant alloys are commonly used in temperature measurement devices due to their stable resistance.
  • Electrical Resistance: Used in resistors, shunt resistors, and strain gauges due to their predictable and stable resistance characteristics.
  • Heating Elements: Used in high-temperature resistance wires for electric heating applications.
  • Sensors and Instrumentation: Due to their stable resistance, constant alloys are used in pressure sensors, strain gauges, and other precision instruments.

Constantan (6J40) Technical data of wires

Dia(m) Cross-sectional area(m²) Weight/m (g/m) Resistance/m at 20℃(Ω/m) Dia(m) Cross-sectional area(m²) Weight/m (g/m) Resistance/m at 20℃(Ω/m)
0.020 0.000314 0.00279 1375-1681 0.224 0.03941 0.350 11.4-12.9
0.022 0.000318 0.00337 1136-1389 0.250 0.04909 0.436 9.19-10.37
0.025 0.000491 0.00434 880-1076 0.280 0.06158 0.5468 7.33-8.26
0.028 0.000616 0.00547 702-857 0.315 0.07793 0.6920 5.85-6.47
0.032 0.000804 0.00714 549-645 0.355 0.09898 0.8789 4.61-5.09
0.036 0.001018 0.00904 434-509 0.400 0.12570 1.116 3.63-4.01
0.040 0.001257 0.01116 351-413 0.450 0.15900 1.412 2.87-3.17
0.045 0.001509 0.01412 278-326 0.500 0.19630 1.744 2.32-2.57
0.050 0.001963 0.01744 225-264 0.560 0.24630 2.19 1.87-2.03
0.056 0.002463 0.02187 179-210 0.630 0.31170 2.77 1.48-1.60
0.063 0.003117 0.02768 142-166 0.710 0.39590 3.52 1.16-1.26
0.071 0.003959 0.03516 112-131 0.750 0.44180 3.92 1.04-1.13
0.080 0.005027 0.04464 87.9-103.1 0.800 0.50270 4.46 0.917-0.993
0.090 0.006362 0.05650 69.4-81.5 0.850 0.56740 5.04 0.812-0.880
0.100 0.007854 0.06970 56.2-66.0 0.900 0.63620 5.65 0.724-0.785
0.112 0.009852 0.08749 45.3-52.1 0.950 0.70880 6.29 0.650-0.704
0.125 0.012270 0.10900 36.4-41.9 1.000 0.78540 6.97 0.587-0.636
0.140 0.015390 0.13670 29.0-33.4 1.060 0.88250 7.84 0.522-0.566
0.150 0.017670 0.15690 25.3-29.1 1.120 0.98520 8.75 0.468-0.507
0.160 0.020110 0.17850 22.2-25.5 1.180 1.09400 9.71 0.421-0.456
0.170 0.022700 0.20160 19.7-22.6 1.250 1.22700 10.9 0.375-0.407
0.180 0.025450 0.22600 17.5-20.2 1.320 1.36800 12.15 0.337-0.365
0.190 0.028350 0.25200 15.7-18.1 1.400 1.53900 13.67 0.299-0.324
0.200 0.031420 0.27900 14.4-16.2 1.500 1.76700 15.69 0.261-0.282
0.212 0.035300 0.31350 12.8-14.4 1.600 2.01100 17.86 0.229-0.248

Constantan strip resistance value (Ω/m)

Width


Thickness		 6.3 8.0 10.0 12.5 16.0 20.0 25.0 31.5 40.0
0.180 0.150 　 　 　 　 　 　 　 　
0.200 0.405 　 　 　 　 　 　 　 　
0.224 0.362 0.2850 　 　 　 　 　 　 　
0.250 0.324 0.2550 0.196 　 　 　 　 　 　
0.280 0.289 0.2280 0.175 　 　 　 　 　 　
0.315 0.257 0.2030 0.155 0.124 　 　 　 　 　
0.355 0.228 0.1800 0.138 0.110 　 　 　 　 　
0.400 0.203 0.1600 0.122 0.980 0.0765 　 　 　 　
0.450 0.180 0.1420 0.109 0.0871 0.0680 0.0544 0.0435 　 　
0.500 0.162 0.1280 0.098 0.0784 0.0612 0.0490 0.0392 　 　
0.560 0.145 0.1140 0.0875 0.0700 0.0547 0.0437 0.0350 　 　
0.630 0.129 0.1010 0.0777 0.0622 0.0486 0.0389 0.0311 　 　
0.710 0.114 0.0900 0.0690 0.0552 0.0431 0.0345 0.0276 　 　
0.800 0.101 0.0800 0.0612 0.0490 0.0383 0.0306 0.0245 0.0194 0.0153
0.900 0.090 0.0710 0.0544 0.0435 0.0340 0.0272 0.0218 0.0173 0.0136
1.000 0.081 0.0640 0.0490 0.0392 0.0306 0.0245 0.0196 0.0155 0.0122
1.120 0.072 0.0570 0.0437 0.0350 0.0273 0.0219 0.0175 0.0139 0.0109
1.250 0.065 0.0510 0.0392 0.0313 0.0245 0.0196 0.0157 0.0124 0.0098
1.400 0.058 0.0460 0.0350 0.0280 0.0219 0.0175 0.0140 0.0111 0.0088
1.600 0.051 0.0400 0.0306 0.0245 0.0191 0.0153 0.0122 0.0097 0.0077
1.800 0.045 0.0350 0.0272 0.0218 0.0170 0.0136 0.0109 0.0086 0.00680
2.000 0.041 0.0320 0.0245 0.0196 0.0153 0.0122 0.0098 0.0078 0.0061

Constantan&Manganin wire table

Dia.(mm) Sectional area nominal value(mm2) Resistance per meter (Ω/m)
6J12X 6J8X 6J13X 6J40X
Nominal value(mm) Tolerance Nominal value (Ω/m) Tolerance Nominal value (Ω/m) Tolerance Nominal value (Ω/m) Tolerance Nominal value (Ω/m) Tolerance
0.020 ±0.002 0.000314 1496 ±10% 　 　 　 　 1528 ±10%
0.022 0.000380 1236 1263
0.025 0.000491 957 978
0.028 0.000616 763 780
0.032 ±0.003 0.000804 584 ±8% 　 ±8% 　 ±8% 597 ±8%
0.036 0.001018 462 472
0.040 0.001257 374 382
0.045 0.001590 296 302
0.050 0.001963 239 244
0.056 0.002463 191 195
0.063 0.003117 151 154
0.071 0.003959 119 121
0.080 0.005027 93.5 69.6 87.5 95.5
0.090 0.006362 73.9 55.0 69.2 75.5
0.100 0.007854 59.8 44.6 56.0 61.1
0.112 ±0.005 0.009852 47.7 ±7% 35.5 ±7% 44.7 ±7% 48.7 ±7%
0.125 0.01227 38.3 28.5 35.9 39.1
0.140 0.01539 30.5 22.7 28.6 31.2
0.160 0.02011 23.4 17.4 21.9 23.9
0.180 0.02545 18.5 13.8 17.3 18.9
0.200 ±0.005 0.03142 15.0 ±6% 11.1 ±6% 14.0 ±6% 15.3 ±6%
0.224 0.03941 11.9 8.88 11.2 12.2
0.250 0.04909 9.57 7.13 8.96 9.78
0.280 0.06158 7.63 5.68 7.15 7.80
0.315 ±0.010 0.007793 6.03 ±5% 4.49 ±5% 5.65 ±5% 6.16 ±5%
0.355 0.09898 4.75 3.54 4.45 4.85
0.400 0.1257 3.74 2.79 3.50 3.82
0.450 0.1590 2.96 2.20 2.77 3.02
0.500 ±0.015 0.1963 2.39 ±4% 1.78 ±4% 2.24 ±4% 2.44 ±4%
0.560 0.2463 1.91 1.42 1.79 1.95
0.630 0.3117 1.51 1.12 1.41 1.51
0.710 0.3959 1.19 0.884 1.11 1.21
0.750 0.4418 1.06 0.792 1.00 1.09
0.800 0.5027 0.935 0.696 0.875 0.955
0.850 0.5674 0.828 0.617 0.775 0.846
0.900 0.6362 0.739 0.550 0.692 0.755
0.950 0.7088 0.663 0.494 0.621 0.677
1.000 0.7854 0.598 0.446 0.560 0.611
1.060 ±0.020 0.8852 0.533 ±4% 0.397 ±4% 0.499 ±4% 0.544 ±4%
1.120 0.9852 0.477 0.355 0.447 0.487
1.180 1.094 0.430 0.320 0.402 0.439
1.250 1.227 0.383 0.285 0.359 0.391
1.320 1.368 0.343 0.256 0.322 0.351
1.400 1.539 0.305 0.227 0.286 0.312
1.500 1.767 0.266 0.198 0.249 0.272
1.600 2.011 0.234 0.174 0.219 0.239
1.700 ±0.025 2.270 0.207 ±4% 0.154 ±4% 0.194 ±4% 0.211 ±4%
1.800 2.545 0.185 0.138 0.173 0.189
1.900 2.835 0.166 0.123 0.155 0.169
2.000 3.142 0.15 0.111 0.140 0.153
2.120 3.530 0.133 0.0992 0.125 0.136
2.240 ±0.030 3.941 0.119 ±4% 0.0888 ±4% 0.112 ±4% 0.122 ±4%
2.360 4.374 0.107 0.0800 0.101 0.110
2.500 4.909 0.0957 0.0713 0.0896 0.0978
2.650 5.515 0.0852 0.0635 0.0798 0.0870
2.800 6.158 0.0763 0.0568 0.0715 0.0780
3.000 7.069 0.0665 0.0495 0.0622 0.0679
3.150 ±0.035 7.793 0.0603 ±4% 0.0449 ±4% 0.0565 ±4% 0.0616 ±4%
3.350 8.814 0.0533 0.0397 0.0499 0.0545
3.550 9.898 0.0475 0.0354 0.0445 0.0485
3.750 11.04 0.0426 0.0317 0.0398 0.0435
4.000 12.57 0.0374 0.0279 0.0350 0.0382
4.250 14.19 0.0331 0.0247 0.0310 0.0338
4.500 15.90 0.0296 0.0220 0.0277 0.0302
4.750 ±0.040 17.72 0.0265 ±4% 0.0198 ±4% 0.0248 ±4% 0.0271 ±4%
5.000 19.63 0.0239 0.0178 0.0224 0.0244
5.300 ±0.050 22.06 0.0213 ±4% 0.0159 ±4% 0.0199 ±4% 0.0218 ±4%
5.600 24.63 0.0191 0.0142 0.0179 0.0195
6.000 ±0.060 28.27 0.0166 ±4% 0.0124 ±4% 0.0156 ±4% 0.017 ±4%
6.300 31.17 0.0151 0.0112 0.0141 0.0154

6J40 Constantan Copper-Nickel Alloy Optimal Choice For Stable Electrical Properties6J40 Constantan Copper-Nickel Alloy Optimal Choice For Stable Electrical Properties


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