Resistance Wire

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电阻线用于控制电路中的电流量。由于可以使用较短的电线,因此高电阻率更好。当电阻器的稳定性主要重要时,合金的电阻率温度和耐腐蚀性在材料选择中非常重要。当它用于加热元件时,用于诸如电加热器和烤肉仪的应用,高电阻率和抗氧化性是重要的。

有时电阻线通过陶瓷粉末绝缘并在另一合金的管中覆盖。这种加热元件用于电烤箱和热水器,以及用于烹饪的专用形式。

尼姆罗姆, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures. When used as a heating element, it is usually wound into coils. One challenge when using nichrome wire is that common tin-based electrical solder will not bond with it, so the connections to the electrical power must be made using other methods such as crimp connectors or screw terminals.

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计算器工具

Enter the resistivity value (OHMS/CMF) of any alloy from the chart below into the RESISTIVITY cell (double click the cell to highlight/clear/input your selection). Enter the desired diameter of the wire into the DIAMETER cell and the calculator will give minimum and maximum resistance values for standard 5% range, and special order 3% range. All values are for 20C.

Properties of Major Alloys

Material Chemical Composition (%) Resistivity at 20°C 线性膨胀系数20-100°C Tensile Strength (PSI at 20C) Specific Gravity Pounds Per Cubic Inch Magnetic Attraction Approx. Melting Point (°C)
OHMS/ CMF TCR 0-100°C Min. Max.
MWS-875 22.5 Cr, 5.5 AI, .5 Si, .1 C, bal. Fe 875 .00002 .000012 105,000 175,000 7.10 .256 Strong 1520
MWS-800 75 Ni, 20 Cr, 2.5 AI, 2.5 Cu 800 .00002 .000014 100.,000 200,000 8.10 .293 None 1350
MWS-675. 61 Ni, 15 Cr, bal. Fe 675 .00013 .0000137 95,000 175,000 8.247 .2979 Faint 1350
MWS-650 80 Ni, 20 Cr 650 .00010 .0000132 100.,000 200,000 8.412 .3039 None 1400
ALLOY 42 42 Ni, bal. Fe 390 .0010 .0000029 70,000 150,000 8.10 .295 Strong 1425
MWS-294 55铜,45米 294 .00002 * .0000149 60,000 135,000 8.90 .321 None 1210
MWS-294R 29 Ni, 17 Co, bal. Fe 294 .0033 .0000033 65,000 150,000 8.36 .302 Strong 1450.
Manganin 13 Mn, 4 Ni, bal. Cu 290 .000015** .0000187 40,000 90,000 8.192 .296 None 1020
Alloy 52 50.5 Ni, bal. Fe 260 .0029 .0000049 70,000 150,000 8.25 .301 Strong 1425
MWS-180 23 Ni., bal. Cu 180 .00018 .0000159 50,000 100.,000 8.90 .321 None 1100
MWS-120 70 Ni, 30 Fe 120 .0045 .000015 70,000 150,000 8.46 .305 Strong 1425
MWS-90 12 Ni, bal. Cu 90 .0004 .0000161 35,000. 75,000 8.90 .321 None 1100
MWS-60 6 Ni, bal. Cu 60 .0005 .0000163 35,000. 70,000 8.90 .321 None 1100
MWS-30 2 Ni, bal. Cu 30 .0013 .0000165 30,000 60,000 8.90 .321 None 1100
Nickel 205 99 NI. 57 .0048 .000013 60,000 135,000 8.90 .321 Strong 1450.
镍270. 99.97 NI. 45 .0067 .000013 48,000 95,000 8.89 .321 Strong 1452

*TCR at 25-105°
**TCR at 15-35°C
Note: Available bare or insulated. See the insulation guide.

电阻合金数据

Download Data Sheet

一些常见材料的电阻率

Material Resistivity (OHM-CMIL/FT) Resistivity (10−6 OHM-CM)
运算器minum 15.94 2.650
Brass 42.1 7.0
Carbon (amorphous) 23 3.95
Constantan 272.97 45.38
Copper 10.09 1.678
Iron 57.81 9.61
Manganin 290 48.21
Molybdenum 32.12 5.34
尼姆罗姆 675 112.2
nichrome V. 650 108.1
Nickel 41.69 6.93
63.16 10.5
Stainless Steel (304) 541 90
Steel (.5% carbon) 100. 16.62
Zinc 35.49 5.90

Common Alloy Trade Names

MWS Wire Carpenter Tech. Driver-Harris Harrison Hoskins 杰利夫 Kanthal 分析
MWS - 875 Alchrome 875 - HAI-FeCr Al25 Alloy 875 - Kanthal A-1 -
MWS - 800 Evanohm Karma HAI-431 Chromel R Alloy 800 Nikrothal L 分析loy
MWS - 675. 托皮特C. 尼姆罗姆 HAI-NiCr 60 Chromel C Alloy C Nikrothal 6 Electroloy
多工作站系统- 650 托皮特A. nichrome V. HAI-NiCr 80 Chromel A Alloy A Nikrothal 8 Protoly
MWS - 294 Cupron Advance HAI-CuNi 102 Copel Alloy 45 Cuprothal 294 Neutroloy
MWS - 294R Kovar - HAI-373 - - - -
MWS - 180 180 Alloy midohm. HAI-180 Alloy 380 合金180. Cuprothal 180 -
MWS - 120 Balco Hytemo HAI-380 - Alloy 120 - 骨盆
MWS - 90 90 Alloy #95 Alloy HAI-90 合金290. Alloy 90 Cuprothal 90 -
MWS - 60 60 Alloy 罗姆 HAI-60 Alloy 260 Alloy 60 Cuprothal 60 -
MWS - 30 30 Alloy #30 Alloy HAI-30 Alloy 230 Alloy 30 昆克州30. -