Nichrome Resistivity and Temperature Coefficient
Request Nichrome Wire Specifications
Auremo LLC supports U.S. inquiries for nichrome wire and related forms used in resistance-heating applications. Include alloy grade, diameter or section, operating temperature, length and quantity.
Product forms
- Wire
- Strip
- Sheet
- Custom dimensions subject to review
Information to include in your request
Please provide the material grade or specification, product form, dimensions and tolerances, quantity, delivery ZIP code and required documentation. Pricing, availability and lead time are confirmed for each quotation.
Frequently asked questions
How is the price for nichrome wire and mill products confirmed?
The quotation is based on the exact grade, dimensions, tolerances, quantity, documentation and delivery requirements supplied with the inquiry.
Can non-standard dimensions be requested?
Yes. Send a drawing or dimensional requirements with the inquiry. Manufacturing or sourcing feasibility is confirmed during quotation.
What information is available for delivery in the United States?
Provide the destination ZIP code. Available freight options, lead time and delivery terms will be included in the commercial response.
Related products
During heating, the resistivity of the metal increases due to the activation of Brownian motion of the atoms. Some alloys, which have a higher resistivity, practically do not change it with increasing temperature (manganin, constantan). This is due to the special structure of alloys and the small average free path of electrons.
Change of conductivity
The temperature coefficient of resistance reflects the change in conductivity when a material is heated or cooled. If the temperature coefficient is designated by α and resistivity at 20°C by Ro, then when a material is heated to the temperature t° its resistivity R1 = Ro (1 + (α(t1 - to))
| Material | Temperature coefficient α1/°C |
| Aluminium | 0,004 |
| Tungsten | 0,004 |
| Iron | 0,006 |
| Constantan | 0,00001 |
| Brass | 0,002 |
| Manganine | 0,00004 |
| Copper | 0,004 |
| Nichrome | 0,0002 |
| Fechral | 0,0001 |
| Electrolytes | 0,02 |
Here is an example. The temperature coefficient for ferrules = 0.0001 /1 degree, and for nichrome α = 0.0002 / 1 degree. This means that heating at 100 °C increases the electrical resistance of the ferrules by 1% and that of the nichrome by 2%.
A piece of nichrome wire of 1 m
| Cross-section (mm) | Electrical resistance at t° 20 °C (ohm) | Resistance at 100 °C (ohms) | Electrical resistance at 1000 °C (ohms) |
| 0,3 | 15,71 | 16,05 | 19,1 |
| 0,5 | 5,6 | 5,612 | 5,72 |
| 0,7 | 2,89 | 2,95 | 3,4,7 |
| 0,9 | 1,7 | 1,734 | 2,04 |
| 1,0 | 1,4 | 1,428 | 1,68 |
| 1,5 | 0,62 | 0,632 | 0,742 |
| 2,0 | 0,35 | 0,357 | 0,42 |
| 2,5 | 0,22 | 0,224 | 0,264 |
| 3,0 | 0,16 | 0,163 | 0,192 |
| 4,0 | 0,087 | 0,0887 | 0,104 |
| 5,0 | 0,056 | 0,0673 | 0,079 |
| 6,0 | 0,039 | 0,0398 | 0,0468 |
| 7,0 | 0,029 | 0,0296 | 0,0348 |
| 8,0 | 0,022 | 0,0224 | 0,0264 |
| 9,0 | 0,017 | 0,01734 | 0,0204 |
| 10,0 | 0,014 | 0,01428 | 0,0168 |
The property of conductors to change their resistance depending on the temperature is used in thermocouples for measuring the temperature of metallurgical processes as well as in drying and firing furnaces.
