Ni70Cr30 Heating Resistance Wire
Ni70Cr30 is an austenitic nickel-chromium alloy suitable for temperature applications up to 1250°C. High chromium content (30% in average) provides very good life time, especially in the furnace applications.
Ni70Cr30 is characterized by high resistivity, good oxidation resistance, good ductility after use and excellent weldability. Alloy is not subject to “green rot" and is particularly well suited for reducing and oxidizing atmospheres.
Electric Heating Devices
Ni70Cr30 resistance wire is widely used in various electric heating devices such as air heaters, electric furnaces, water heaters, etc. It provides stable heating performance and has a relatively long service life.
Ni70Cr30 resistance wire is often made into heating tubes for heating liquids or gases. These heating tubes are commonly used in heaters, water heaters, steam generators, etc.
In household appliances, Ni70Cr30 resistance wire is used to manufacture heating elements for ovens and microwaves. They provide uniform heating and have the advantage of rapid heating.
- Heating Pads and Blankets
Ni70Cr30 resistance wire is also used in the manufacture of heating pads, blankets, and other electric heating products, commonly used for warmth, therapy, etc.
In the automotive industry, Ni70Cr30 resistance wire is used to manufacture car seat heaters, providing comfortable seat heating for drivers and passengers, enhancing comfort during travel.
Nickel-chromium alloy performance tables
| Performance material | Cr10Ni90 | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 |
| Composition | Ni | 90 | Rest | Rest | 55.0～61.0 | 34.0～37.0 | 30.0～34.0 |
| Cr | 10 | 20.0～23.0 | 28.0～31.0 | 15.0～18.0 | 18.0～21.0 | 18.0～21.0 |
| Fe | -- | ≤1.0 | ≤1.0 | Rest | Rest | Rest |
| Maximum temperature℃ | 1300 | 1200 | 1250 | 1150 | 1100 | 1100 |
| Meltiing point ℃ | 1400 | 1400 | 1380 | 1390 | 1390 | 1390 |
| Density g/cm3 | 8.7 | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 |
| Resistivity μΩ·m,20℃ | -- | 1.09±0.05 | 1.18±0.05 | 1.12±0.05 | 1.00±0.05 | 1.04±0.05 |
| | | | | |
| Elongation at rupture | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 |
| Specific heat J/g.℃ | -- | 0.44 | 0.461 | 0.494 | 0.5 | 0.5 |
| | | | | |
| Thermal conductivity KJ/m.h℃ | -- | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 |
| | | | | |
| Coefficient of lines expansion a*10-6/(20～1000℃) | -- | 18 | 17 | 17 | 19 | 19 |
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| | | | | |
| Micrographic structure | -- | Austenite | Austenite | Austenite | Austenite | Austenite |
| Magnetic properties | -- | Nonmagnetic | Nonmagnetic | Nonmagnetic | Weak magnetic | Weak magnetic |
The Form we could offer
| Size Range | |
| Wire | dia 0.03-7.5mm |  |
| dia 8.0-12.0mm |  |
| Ribbon | (0.05-0.35)*(0.5-6.0)mm |  |
|
| Strip | (0.50-2.5)*(5-180)mm |  |
|
| Rod | 8-50mm |  |
