Cr20Ni80 / 80Ni20Cr / NiCr8020 Wire High Electrical Resistivity NiCr Alloy For Electric Heating And Furnace Components
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NiCr Alloy
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Cr20Ni80 / 80Ni20Cr / NiCr8020 Wire High Electrical Resistivity NiCr Alloy For Electric Heating And Furnace Components
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Product Description
Cr20Ni80 / 80Ni20Cr / NiCr8020 Wire High Electrical Resistivity NiCr Alloy for Electric Heating and Furnace Components
Cr20Ni80 / 80Ni20Cr / NiCr8020 Wire is a nickel-chromium alloy consisting of 20% chromium and 80% nickel, known for its excellent high-temperature stability, oxidation resistance, and electrical resistivity. It is primarily used in applications that require high resistivity and high-temperature performance, making it ideal for heating elements, resistors, and industrial furnaces. Cr20Ni80 / 80Ni20Cr / NiCr8020 Wire is a nickel-chromium alloy widely used for high-temperature applications requiring oxidation resistance, high electrical resistivity, and thermal stability. Its excellent performance in heating elements, resistors, and industrial furnaces makes it ideal for industries such as electric power generation, chemical processing, and electronics. Although it comes at a higher cost due to its nickel content, its durability in demanding environments justifies its use in critical applications where performance, stability, and longevity are essential.
|
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
|
GB |
JIS |
ASTM |
DIN EN/DIN |
GOST |
|
Cr20Ni80 |
NCHW-1 NCHR-1 |
80Ni20Cr |
NiCr8020 |
Х20Н80-Н |
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:
Composition:
Nickel (Ni): 80% (provides high electrical resistivity and ensures the alloy's stability at elevated temperatures).
Chromium (Cr): 20% (enhances the oxidation and corrosion resistance, contributing to high-temperature durability).
Iron (Fe): Minimal amounts, contributing to overall strength and cost-effectiveness.
Other Elements: Small quantities of silicon, carbon, and manganese to improve strength, workability, and overall mechanical properties.
High-Temperature Resistance:
Oxidation Resistance: The high chromium content (20%) ensures excellent oxidation resistance in high-temperature environments, typically up to 1150°C (2102°F). This protective oxide layer prevents degradation and oxidation, even when exposed to oxidative gases and extreme heat.
Thermal Stability: Excellent thermal stability under fluctuating temperature conditions, making it ideal for heating elements in high-temperature systems.
Electrical Resistivity:
High Electrical Resistivity: The alloy has a high electrical resistivity, which makes it highly effective in applications where controlled heat generation or electrical resistance is needed. Its stable resistance is a key characteristic in resistive heating elements.
Temperature Coefficient of Resistance (TCR): It maintains a stable TCR over a wide temperature range, ensuring consistent performance in resistive heating applications.
Corrosion and Scaling Resistance:
Superior Oxidation Resistance: The chromium in the alloy forms a protective oxide layer at high temperatures, making it resistant to oxidation in air and oxidizing gases, which can cause other materials to degrade.
Sulfidation Resistance: It also resists sulfidation, ensuring durability in high-temperature industrial processes that may involve sulfur or sulfur-based compounds.
Mechanical Properties:
Tensile Strength and Ductility: The alloy provides good tensile strength at elevated temperatures and is sufficiently ductile to be drawn into wires, coils, and other shapes for various applications.
Fatigue Resistance: The material can withstand thermal cycling and fatigue from heating and cooling without significant structural damage, making it suitable for resistive heating elements and other high-stress, high-heat environments.
Weldability and Fabrication:
Weldability: Cr20Ni80 alloy can be welded using standard techniques like TIG (Tungsten Inert Gas) or MIG (Metal Inert Gas) welding. However, it is important to control heat input during welding to avoid degradation of the material's properties.
Formability: The wire can be drawn into thin strands, coiled, or formed into other shapes, making it ideal for various industrial heating elements, resistors, and thermocouple wires.
Applications:
Heating Elements: NiCr8020 is commonly used in high-temperature heating elements, such as those found in industrial furnaces, electric ovens, and dryers.
Resistors: Its high electrical resistivity makes it suitable for use in resistors, electrical heating components, and resistance temperature detectors (RTDs).
Industrial Furnaces: Frequently used in high-temperature furnace components, such as heating coils, radiant tubes, and thermal insulation elements.
Thermocouples and Sensors: Used in temperature sensors and thermocouples for high-temperature applications where stable electrical resistance is required.
Advantages of Cr20Ni80 (80Ni20Cr, NiCr8020) Alloy Wire:
Excellent High-Temperature Performance: Can operate at temperatures up to 1150°C (2102°F) without significant oxidation or degradation, making it ideal for high-temperature applications.
Superior Oxidation and Corrosion Resistance: The 20% chromium content ensures excellent resistance to oxidation, corrosion, and scaling in high-heat and oxidative environments.
Stable Electrical Resistivity: The alloy offers stable electrical resistance, making it ideal for resistive heating elements, precision resistors, and other applications requiring consistent electrical characteristics.
Durable in Harsh Environments: Excellent performance in environments that involve repeated heating and cooling cycles, thermal shock, or oxidizing gases.
Versatility in Fabrication: Easily processed into various forms, including wire, coils, strips, and other shapes, suitable for a wide range of industrial 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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