NiCr Alloy Cr30Ni70/NiCr7030/ХН70Ю for Industrial Heating Elements and Resistance Applications in High-Temperature Environments
NiCr Alloy Wire (Cr30Ni70, NiCr7030, ХН70Ю) is a high-performance nickel-chromium alloy primarily composed of 30% chromium and 70% nickel. This alloy offers excellent high-temperature strength, corrosion resistance, and thermal stability, making it widely used in industrial heating elements, electrical resistance applications, and high-temperature environments. NiCr Alloy Wire (Cr30Ni70, NiCr7030, ХН70Ю) is a high-performance nickel-chromium alloy that offers exceptional oxidation and corrosion resistance, high-temperature stability, and mechanical strength. It is commonly used in heating elements, electrical resistors, thermocouples, and other high-temperature applications across industries such as aerospace, chemical processing, and power generation. Its ability to maintain performance in extreme conditions, combined with its excellent formability and weldability, makes it an ideal material for critical industrial applications.
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. |
| Chemical Composition Wt.% Cr30Ni60 | % | Ni | Fe | C | Si | Mn | P | S | Cr | Al |
| Min | | | | 0.75 | | | | 28 | |
| Max | Rest | 0.08 | 0.08 | 1.6 | 0.6 | 0.02 | 0.015 | 31 | 0.5 |
Key Features of NiCr Alloy Wire (Cr30Ni70, NiCr7030, ХН70Ю):
Nickle (Ni): Approximately 70% — provides excellent resistance to corrosion, oxidation, and high-temperature stability.
Chromium (Cr): Approximately 30% — enhances oxidation resistance and contributes to the alloy's high-temperature strength.
Other Elements: May contain trace amounts of manganese, iron, and silicon to improve mechanical properties and processability.
- Corrosion and Oxidation Resistance:
Oxidation Resistance: The high chromium content enables the alloy to form a protective oxide layer, providing exceptional resistance to oxidation, even at temperatures up to 1200°C (2192°F).
Corrosion Resistance: Resistant to acids, alkalis, and saltwater, making it suitable for use in chemically aggressive environments.
Resistant to Scaling: Can withstand high-temperature exposure to air, reducing the risk of scaling or material degradation.
- High-Temperature Performance:
Temperature Stability: Retains mechanical strength and integrity even at high temperatures, up to 1100-1200°C (2012-2192°F).
Thermal Expansion: Exhibits a low coefficient of thermal expansion, which makes it stable under temperature variations.
High Tensile Strength: Provides excellent mechanical strength at elevated temperatures.
Ductility: Exhibits good ductility and formability, making it suitable for bending, twisting, or other fabrication techniques.
Fatigue Resistance: Withstands thermal cycling and mechanical stress without compromising integrity.
- Weldability and Fabrication:
Ease of Fabrication: Easily fabricated into wires, strips, or other forms for industrial applications.
Weldable: Can be welded using standard techniques like GTAW and GMAW.
Formability: Can be drawn into fine wires for use in heating elements or resistance applications.
Applications:
- Heating Elements: Commonly used in electric resistance heating elements, such as those found in ovens, furnaces, and industrial heaters.
- Electrical Resistors: Suitable for the manufacture of high-temperature resistors, such as in industrial furnaces, kiln components, and in electrical appliances.
- Thermocouples: Employed as a thermocouple wire for temperature sensing in extreme environments.
- Aerospace and Power Generation: Used in turbine components, heat exchangers, and other high-temperature systems.
- Chemical Industry: Ideal for applications where high resistance to corrosive environments and high temperatures is required.
Advantages of NiCr Alloy Wire (Cr30Ni70, NiCr7030, ХН70Ю):
- High Temperature Resistance: Retains strength and stability even at extreme temperatures, making it ideal for heating elements and high-heat industrial applications.
- Corrosion and Oxidation Resistance: Performs well in corrosive environments, offering long service life in chemical processing industries.
- Excellent Mechanical Properties: Offers high tensile strength, ductility, and fatigue resistance.
- Weldable and Formable: Easy to work with and fabricate into various forms for different industrial uses.
- Versatile Application Range: Suitable for use in a wide range of high-temperature and corrosive applications, including heating systems, resistive elements, and electrical components.
Limitations of NiCr Alloy Wire (Cr30Ni70, NiCr7030, ХН70Ю):
- Cost: The high nickel content increases the cost of the alloy compared to other metals and alloys with lower nickel content.
- Work Hardening: The alloy may work harden during cold forming processes, requiring specialized techniques for fabrication.
- Mechanical Stress: While it has good strength at high temperatures, it may not be suitable for applications that involve extreme mechanical stress or heavy loads.
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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NiCr Alloy Cr30Ni70/NiCr7030/ХН70Ю For Industrial Heating Elements And Resistance Applications In High-Temperature Environments Images
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