Cr20Ni80/80Ni20Cr/NiCr8020 Corrosion-Resistant NiCr Alloy with High Nickel Content for Electric Heating and Furnace Components
Cr20Ni80 / 80Ni20Cr / NiCr8020 Wire is a versatile and reliable nickel-chromium alloy that excels in high-temperature applications, offering excellent oxidation resistance, high electrical resistivity, and mechanical stability. It is widely used in electric heating elements, resistors, furnaces, and thermocouples, making it a critical material in industries that require precision heating and resistance at elevated temperatures. While it is more expensive than other alloys, its superior performance in harsh thermal and oxidative environments makes it a preferred choice for demanding applications. Cr20Ni80 / 80Ni20Cr / NiCr8020 Wire is a high-performance nickel-chromium alloy that contains 20% chromium and 80% nickel. This alloy is known for its high electrical resistivity, excellent oxidation resistance, and outstanding high-temperature strength, making it a popular choice for resistance heating elements, high-temperature applications, and resistors.
| Chemical Composition Wt.% Cr20Ni80 | % | Ni | Fe | C | Si | Mn | P | S | Cr | Al |
| Min | | | | 0.75 | | | | 20 | |
| Max | Rest | 1 | 0.08 | 1.6 | 0.6 | 0.02 | 0.015 | 23 | 0.5 |
Trade Code
Main characteristics of Ni-Cr and Ni-Cr-Fe electric heating alloys
| Type
Performance
| Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni80 | Cr20Ni30 | Cr25Ni20 |
| Main Chemical composition | Ni | Rest | 55.0-61.0 | 34.0-37.0 | Rest | 30.0-34.0 | 19.0-22.0 |
| Cr | 28.0-31.0 | 15.0-18.0 | 18.0-21.0 | 20.0-23.0 | 18.0-21.0 | 24.0-26.0 |
| Fe | ≤ 1.0 | Rest | Rest | ≤ 1.0 | Rest | Rest |
| Max. continuous service temp. of element (℃) | 1250 | 1150 | 1100 | 1200 | 1100 | 1050 |
| Resistivity at 20 ℃(μΩm) | 1.18±0.05 | 1.12±0.05 | 1.04±0.05 | 1.09±0.05 | 1.06±0.05 | 0.95±0.05 |
| Density(g/cm3) | 8.10 | 8.20 | 7.90 | 8.40 | 7.90 | 7.15 |
| Thermal condyctivity (KJ/m·h·℃) | 45.2 | 45.2 | 43.8 | 60.3 | 43.8 | 43.8 |
| Coefficient of lines expansion (α×10-6/℃) | 17.0 | 17.0 | 19.0 | 18.0 | 19.0 | 19.0 |
| Melting point (approx.)(℃) | 1380 | 1390 | 1390 | 1400 | 1390 | 1400 |
| Elonation at rupture(%) | ＞20 | ＞20 | ＞20 | ＞20 | ＞20 | ＞20 |
| Micrographic structure | Austenite | Austenite | Austenite | Austenite | Austenite | Austenite |
| Magnetic properties | Non-magnetic | Low-magnetic | Low-magnetic | Non-magnetic | Low-magnetic | Non-magnetic |
| Note:The various grades of electric resistance alloy material are blended with the amountof rare earth, titanium and other trace elements, to improve the processing performance andextend the period of the uselife. |
Some key features of Cr20Ni80 include:
Nickel (Ni): 80% (provides high-temperature strength, excellent resistance to oxidation, and stable electrical resistivity).
Chromium (Cr): 20% (enhances the alloy's oxidation resistance and improves its strength at high temperatures).
Iron (Fe): Small amounts (balance, used for maintaining alloy's mechanical properties).
Other Elements: Traces of manganese, silicon, and carbon are also present to enhance workability, strength, and resistance to oxidation.
- High-Temperature Resistance:
Oxidation Resistance: With 20% chromium, the alloy forms a stable oxide layer, preventing excessive oxidation even at temperatures up to 1100°C (2012°F). This makes it ideal for high-temperature environments where other materials would fail.
Thermal Stability: Maintains excellent mechanical properties and strength even under extreme temperatures, ensuring reliable long-term performance in high-heat applications.
High Electrical Resistivity: The high nickel content gives this alloy excellent electrical resistivity, making it ideal for use in heating elements, resistors, and electrical components that require stable electrical resistance over a range of temperatures.
Stable Temperature Coefficient of Resistance (TCR): NiCr8020 exhibits a stable TCR, which is important for maintaining consistent resistance even as temperature fluctuates, ensuring predictable heating performance.
- Corrosion and Scaling Resistance:
Oxidation Resistance: The alloy's chromium content ensures that it performs well in oxidizing environments, preventing scaling and oxidation even at high temperatures.
Sulfidation Resistance: Performs well in environments that may contain sulfur, ensuring it does not degrade quickly under high-temperature oxidative and sulfidation conditions.
Tensile Strength: Exhibits good tensile strength at high temperatures, allowing it to withstand mechanical stresses during operation.
Ductility and Formability: While offering excellent mechanical strength, the alloy retains sufficient ductility for processing into wire, strip, or coil forms, making it highly versatile.
- Weldability and Fabrication:
Weldability: NiCr8020 wire is weldable using standard techniques such as TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) welding, although precautions should be taken to avoid excessive heat input to prevent embrittlement in the welded areas.
Ease of Fabrication: Can be easily drawn into wire or formed into coils and strips for use in heating elements, resistors, and other components.
Applications:
- Heating Elements: One of the most common uses is in electric heating elements, especially in high-temperature furnaces, industrial ovens, and dryers, where the alloy’s high resistivity and stable resistance are critical for efficient and controlled heating.
- Resistors: Frequently used in high-power resistors and other electrical components where stable electrical characteristics are necessary for precise control in electrical circuits.
- Industrial Furnaces: Ideal for components such as heating coils and radiant heaters in furnaces and heating systems that require long-term durability at high temperatures.
- Thermocouples and Sensors: Used in temperature sensors and thermocouples for applications where accurate temperature measurements are necessary in high-heat environments.
Advantages of Cr20Ni80 (80Ni20Cr, NiCr8020) Alloy Wire:
- High-Temperature Performance: Can withstand temperatures up to 1100°C (2012°F), making it suitable for extreme heat environments like electric heating elements, resistors, and furnaces.
- Superior Oxidation Resistance: Offers excellent resistance to oxidation, ensuring it lasts longer in high-temperature oxidative environments.
- Stable Electrical Resistivity: Provides stable electrical resistance even at high temperatures, which is important for precision resistors and heating elements.
- Corrosion Resistance: Excellent resistance to sulfidation and scaling, ensuring durability in harsh industrial environments.
- Weldability and Fabrication: Easy to process into wire, coils, and strips, and can be welded for use in custom applications.
Technical data of wires
| Dia. (mm) | Cross-sectional area (mm²) | Weight/Meter (g/m) | Resistance/Meter at 20 ℃ (Ω/m) | Dia. (mm) | Cross-sectional area (mm²) | Weight/Meter (g/m) | Resistance/Meter at 20 ℃ (Ω/m) |
| 0.018 | 0.000255 | 0.002117 | 3410-4610 | 0.25 | 0.04909 | 0.4074 | 20.88-23.54 |
| 0.020 | 0.000314 | 0.002606 | 2940-3740 | 0.28 | 0.06158 | 0.5111 | 16.64-18.76 |
| 0.022 | 0.000380 | 0.003154 | 2440-3100 | 0.30 | 0.07069 | 0.5867 | 14.49-16.35 |
| 0.025 | 0.000491 | 0.004075 | 1880-2400 | 0.32 | 0.07548 | 0.6265 | 12.74-14.36 |
| 0.028 | 0.000616 | 0.005113 | 1530-1870 | 0.33 | 0.08553 | 0.7099 | 12.20-13.40 |
| 0.030 | 0.000707 | 0.005868 | 1338-1696 | 0.38 | 0.1134 | 0.9412 | 9.13-10.09 |
| 0.032 | 0.000804 | 0.006673 | 1180-1440 | 0.40 | 0.1257 | 1.0433 | 8.24-9.108 |
| 0.035 | 0.000962 | 0.007985 | 981-1200 | 0.41 | 0.132 | 1.0956 | 7.68-8.89 |
| 0.040 | 0.001257 | 0.01043 | 780.7-954.1 | 0.45 | 0.159 | 1.3197 | 6.51-7.196 |
| 0.045 | 0.00159 | 0.0132 | 594-726 | 0.50 | 0.1963 | 1.6293 | 5.273-5.829 |
| 0.050 | 0.001963 | 0.01629 | 499.6-610.6 | 0.55 | 0.2376 | 1.9721 | 4.518-4.994 |
| 0.055 | 0.00238 | 0.01975 | 407-477 | 0.60 | 0.2827 | 2.3464 | 3.797-4.197 |
| 0.063 | 0.00312 | 0.02590 | 321.41-377.31 | 0.65 | 0.3318 | 2.7539 | 3.235-3.575 |
| 0.070 | 0.00385 | 0.03196 | 260.5-305.9 | 0.70 | 0.3848 | 3.1938 | 2.789-3.083 |
| 0.080 | 0.005027 | 0.04172 | 199.5-234.1 | 0.75 | 0.4418 | 3.6669 | 2.43-2.686 |
| 0.090 | 0.006362 | 0.0528 | 157.6-185.0 | 0.80 | 0.5027 | 4.1724 | 2.136-2.36 |
| 0.100 | 0.007854 | 0.0652 | 127.7-149.9 | 0.85 | 0.5674 | 4.7094 | 1.891-2.091 |
| 0.110 | 0.009852 | 0.08177 | 105.5-123.9 | 0.90 | 0.6362 | 5.2805 | 1.687-1.865 |
| 0.120 | 0.01227 | 0.1018 | 88.67-104.1 | 0.95 | 0.7088 | 5.883 | 1.46-1.62 |
| 0.140 | 0.01539 | 0.1277 | 65.85-75.77 | 1.00 | 0.7854 | 6.5188 | 1.367-1.511 |
| 0.150 | 0.01767 | 0.1467 | 56.75-66.63 | 1.10 | 0.9503 | 7.8875 | 1.13-1.26 |
| 0.160 | 0.02011 | 0.01669 | 50.42-58.00 | 1.12 | 0.9852 | 8.1772 | 1.05-1.17 |
| 0.170 | 0.022700 | 0.1884 | 44.18-51.86 | 1.18 | 1.0936 | 9.0769 | 0.95-1.05 |
| 0.180 | 0.02545 | 0.2112 | 40.26-45.40 | 1.20 | 1.313 | 10.8979 | 0.79-0.87 |
| 0.190 | 0.02835 | 0.2353 | 35.37-41.53 | 1.30 | 1.327 | 11.0141 | 0.78-0.86 |
| 0.200 | 0.03142 | 0.2608 | 32.62-36.78 | 1.40 | 1.539 | 12.7737 | 0.70-0.77 |
| 0.212 | 0.035300 | 0.2930 | 28.41-33.35 | 1.50 | 1.767 | 14.6661 | 0.60-0.67 |
| 0.220 | 0.03801 | 0.3155 | 26.65-30.39 | 1.60 | 2.011 | 16.8924 | 0.52-0.58 |
The tolerance or wires diameter
| Wires | Dia.(mm) | Tolerance |
| 0.018-0.025 | ±0.001 |
| 0.028-0.035 | ±0.0015 |
| 0.040-0.055 | ±0.002 |
| 0.070 | ±0.0025 |
| 0.08-0.10 | ±0.003 |
| 0.11-0.14 | ±0.004 |
| 0.16-0.20 | ±0.005 |
| 0.22-0.25 | ±0.006 |
| 0.28-0.30 | ±0.007 |
| 0.32-0.40 | ±0.01 |
| 0.41-0.50 | ±0.015 |
| 0.55-0.80 | +0.02/-0.03 |
| 0.85-1.00 | +0.02/-0.03 |
| 1.10-1.50 | ±0.03 |
| Note:special specification can be produced as per client's request. |
Technical data of ribbon
| Thickness × Width(mm) | Resistance/meter(20 ℃) (Ω/m) | Surface area/ohm (20℃) (cm2/Ω) | Weight/meter (g/m) | Surface area/meter (cm2/m) |
| 0.09x2.5 | 5.27 | 9.84 | 1.72 | 51.8 |
| 0.08x0.2 | 74 | 0.0756 | 0.122 | 5.6 |
| 0.08x0.3 | 49.4 | 0.154 | 0.183 | 7.6 |
| 0.08x0.4 | 37 | 0.259 | 0.244 | 9.6 |
| 0.08x0.5 | 29.6 | 0.392 | 0.305 | 11.6 |
| 0.08x0.6 | 24.7 | 0.551 | 0.367 | 13.6 |
| 0.08x0.7 | 21.2 | 0.737 | 0.428 | 15.6 |
| 0.08x0.8 | 18.5 | 0.951 | 0.489 | 17.6 |
| 0.08x0.9 | 16.5 | 1.19 | 0.55 | 19.6 |
| 0.08x1.0 | 14.8 | 1.46 | 0.611 | 21.6 |
| 0.08x1.2 | 12.3 | 2.07 | 0.733 | 25.6 |
| 0.08x1.5 | 9.87 | 3.2 | 0.916 | 31.6 |
| 0.08x1.8 | 8.23 | 4.57 | 1.1 | 37.6 |
| 0.08x2.0 | 7.4 | 5.62 | 1.22 | 41.6 |
| 0.07x0.2 | 84.6 | 0.0638 | 0.107 | 5.4 |
| 0.07x0.3 | 56.4 | 0.131 | 0.16 | 7.4 |
| 0.07x0.4 | 42.3 | 0.222 | 0.214 | 9.4 |
| 0.07x0.5 | 33.9 | 0.337 | 0.267 | 11.4 |
| 0.07x0.6 | 28.2 | 0.475 | 0.321 | 13.4 |
| 0.07x0.7 | 24.2 | 0.637 | 0.374 | 15.4 |
| 0.07x0.8 | 21.2 | 0.822 | 0.428 | 17.4 |
| 0.07x0.9 | 18.8 | 1.03 | 0.481 | 19.4 |
| 0.07x1.0 | 16.9 | 1.26 | 0.535 | 21.4 |
| 0.07x1.2 | 14.1 | 1.8 | 0.641 | 25.4 |
| 0.07x1.5 | 11.3 | 2.78 | 0.802 | 31.4 |
| 0.06x0.2 | 98.7 | 0.0527 | 0.0916 | 5.2 |
| 0.06x0.3 | 65.8 | 0.109 | 0.137 | 7.2 |
| 0.06x0.4 | 49.4 | 0.186 | 0.183 | 9.2 |
| 0.06x0.5 | 39.5 | 0.284 | 0.229 | 11.2 |
| 0.06x0.6 | 32.9 | 0.401 | 0.275 | 13.2 |
| 0.06x0.7 | 28.2 | 0.539 | 0.321 | 15.2 |
| 0.06x0.8 | 24.7 | 0.697 | 0.367 | 17.5 |
| 0.06x0.9 | 21.9 | 0.875 | 0.412 | 19.2 |
| 0.06x1.0 | 19.7 | 1.07 | 0.458 | 21.2 |
| 0.06x1.2 | 16.5 | 1.53 | 0.55 | 25.2 |
| 0.05x0.2 | 118 | 0.0422 | 0.0764 | 5.00 |
| 0.05x0.3 | 79 | 0.0886 | 0.115 | 7.00 |
| 0.05x0.4 | 59.2 | 0.152 | 0.153 | 9.00 |
| 0.05x0.5 | 47.4 | 0.232 | 0.191 | 11.00 |
| 0.05x0.6 | 39.5 | 0.329 | 0.229 | 13.00 |
| 0.05x0.7 | 33.9 | 0.443 | 0.267 | 15.0 |
| 0.05x0.8 | 29.6 | 0.574 | 0.305 | 17.0 |
| 0.05x0.9 | 16.3 | 0.722 | 0.344 | 19.0 |
| 0.05x1.0 | 23.7 | 0.886 | 0.382 | 21.0 |
| Ribbon is rolled by the wire, the actual cross-sectional area of the ribbon is smaller 8％ than calculated by the rectangular. |
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Cr20Ni80/80Ni20Cr/NiCr8020 Corrosion Resistant NiCr Alloy With High Nickel Content For Electric Heating And Furnace Components Images
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