Nickel-Chromium and Nickel-Chromium-Iron Resistance Wire
- Nickel-chromium and nickel-chromium-iron resistance wires have the following characteristics:
- - High resistance: Nickel-chromium and nickel-chromium-iron resistance wires have higher resistance values, which enables them to generate heat when an electric current passes through.
- - Good temperature resistance: These resistance wires can withstand high temperatures without significant degradation in performance. They are commonly used in applications where high-temperature resistance is required.
- - Stable resistance: The resistance of nickel-chromium and nickel-chromium-iron resistance wires remains relatively stable over time and does not change significantly with temperature or other factors.
- - Corrosion resistance: These resistance wires are relatively resistant to corrosion, making them suitable for use in harsh environments or where exposure to moisture or chemicals is likely.
- - Long service life: Nickel-chromium and nickel-chromium-iron resistance wires typically have a long service life and can withstand repeated heating and cooling cycles without significant deterioration.
These characteristics make nickel-chromium and nickel-chromium-iron resistance wires widely used in applications such as heating elements, resistive heating, industrial processes, and temperature measurement. The specific choice between nickel-chromium and nickel-chromium-iron resistance wires depends on the specific requirements of the application, including temperature range, resistance value, and corrosion resistance needed. Especially Cr20Ni80 alloy has better comprehensive characteristics and it is the preferred type of high quality electric heating elements. All these products are widely used in industrial electric furnace, metallurgy, machinery, household appliances and other industries to produce heating components.
Main Properties and Characteristics of Nickel-Chromium and Nickel-Chromium-Iron Material
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Alloy Name Properties
|
Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 | |
|---|---|---|---|---|---|---|
| Main Chemical Components |
Ni | Remainder | Remainder | 55.0-61.0 | 34.0-37.0 | 30.0-34.0 |
| Cr | 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 | Remainder | Remainder | Remainder | |
| Maximum operating temperature | 1200 | 1250 | 1150 | 1100 | 1100 | |
| Resistivity 20ºC (μΩ·m) | 1.09±0.05 | 1.18±0.05 | 1.12±0.05 | 1.04±0.05 | 1.04±0.05 | |
| Density(g/cm3) | 8.40 | 8.10 | 8.20 | 7.90 | 7.90 | |
| Coefficient of heat conductivity (20ºC) (W/m·K) |
15 | 14 | 13 | 13 | 13 | |
| Coefficient of linear expansion (20ºC ~ 1000ºC) (α×10-6/ºC) |
18.0 | 17.0 | 17.0 | 19.0 | 19.0 | |
| Melting point(ºC) | 1400 | 1380 | 1390 | 1390 | 1390 | |
| Tensile strength(Rm/MPa) | ≥650 | ≥650 | ≥600 | ≥600 | ≥600 | |
| Elongation after Fracture (A/%) | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | |
| Accelerated life test(Hours/ºC) | ≥80/1200 | ≥50/1250 | ≥80/1150 | ≥80/1100 | ≥50/1100 | |
| Microscopic structure | Austenite | Austenite | Austenite | Austenite | Austenite | |
| Magnetism | Non-magnetic | Non-magnetic | Weak magnetic | Non-magnetic | Non-magnetic | |
The temperature correction factor for Nickel-Chrome and Nickel-Chrome-Iron alloys
|
Temp(ºC) |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1100 |
1200 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Cr20Ni80 |
1 |
1.006 |
1.012 |
1.018 |
1.025 |
1.026 |
1.018 |
1.01 |
1.008 |
1.01 |
1.014 |
1.021 |
1.025 |
|
Cr30Ni70 |
1 |
1.007 |
1.016 |
1.028 |
1.038 |
1.044 |
1.036 |
1.03 |
1.028 |
1.029 |
1.033 |
1.037 |
1.043 |
|
Cr15Ni60 |
1 |
1.011 |
1.024 |
1.038 |
1.052 |
1.064 |
1.069 |
1.073 |
1.078 |
1.088 |
1.095 |
1.109 |
|
|
Cr20Ni35 |
1 |
1.029 |
1.061 |
1.09 |
1.115 |
1.139 |
1.157 |
1.173 |
1.188 |
1.208 |
1.219 |
1.228 |
|
|
Cr20Ni30 |
1 |
1.023 |
1.052 |
1.079 |
1.103 |
1.125 |
1.141 |
1.158 |
1.173 |
1.187 |
1.201 |
1.214 |
1.226 |
| – To obtain resistance at working temperature, multiply by the factor in above table. | |||||||||||||