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Advantages of high resistance electric heating alloy

There are two broad categories of electric heating alloys: chromium-iron-aluminum alloys with a ferritic structure; and nickel-chromium alloys with an austenitic structure. These two types of alloys are also different in performance due to their different organizational structures. However, as electrothermal materials, they have their own advantages, so they are produced in large quantities and widely used in various countries.
Features of 1. iron chromium aluminum electric heating alloy:
Use of high temperatures in the atmosphere
The maximum working temperature of HRE alloy in iron-chromium-aluminum electric heating alloy can reach 1400 ℃, while the maximum working temperature of Cr20Ni80 alloy in nickel-chromium electric heating alloy can reach 1200 ℃.
2. High resistivity
The resistivity of iron-chromium-aluminum alloy is higher than that of nickel-chromium alloy, and larger alloy materials can be used in the design of components, which is beneficial to prolong the service life of components, especially for fine alloy wires.
3, good sulfur resistance
When the sulfur-containing atmosphere and the surface are contaminated by sulfur-containing substances, iron-chromium-aluminum has good corrosion resistance, while nickel-chromium will be severely eroded.
4 is cheap.
Iron-chromium aluminum does not contain scarce nickel, and the price is much cheaper than nickel-chromium.
5. The disadvantage of iron-chromium aluminum alloy is mainly low high temperature strength, and its plasticity increases with the increase of temperature, causing component deformation.
6, long service life
In the same higher operating temperature atmosphere, the life of the pump repair iron-chromium-aluminum component can be 2-4 times that of the nickel-chromium component.
7. High surface load
Because the iron chromium aluminum alloy allows the use of high temperature and long life, the surface load of the parts can also be higher, which not only makes the temperature rise fast but also saves alloy materials.
8. Good oxidation resistance
The Al2O3 oxide film formed on the surface of the chromium-iron-aluminum alloy is dense and has good adhesion to the substrate, which is not easy to be scattered back to flower and water and cause pollution. In addition, Al2O3 has a high resistivity and a high melting point, which determines that the Al2O3 oxide film has excellent oxidation resistance. The carburization resistance is also better than that of Cr2O3 formed on the surface of the ni-cr alloy.
9. Small proportion
The specific gravity of FeCrAl alloys is less than that of nickel-chromium alloys, which means that the production of the same parts with FeCrAl is more material-saving than with nickel-chromium alloys.

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Advantages of high resistance electric heating alloy