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Advantages of high-resistance electric heating alloys
2024-03-21
There are two main categories of electric heating alloys: ferritic chromium-iron-aluminum alloys; and austenitic nickel-chromium alloys. Due to their different microstructures, these two types of alloys also have different properties. However, as electrothermal materials, they each have their own advantages, and therefore are mass-produced and widely used in various countries.
There are two main categories of electric heating alloys: chromium-iron-aluminum alloys with a ferritic structure; and nickel-chromium alloys with an austenitic structure. Due to their different structures, these two types of alloys also differ in their properties. However, as electrothermal materials, they each have their advantages, and therefore are produced in large quantities and widely used in various countries.
I. Characteristics of iron-chromium-aluminum electric heating alloys:
1. High-temperature use in the atmosphere
The maximum operating temperature of the HRE alloy in iron-chromium-aluminum electric heating alloys can reach 1400 ℃, while the maximum operating temperature of the Cr20Ni80 alloy in nickel-chromium electric heating alloys can reach 1200 ℃.
2. High resistivity
The resistivity of iron-chromium-aluminum alloys is higher than that of nickel-chromium alloys. Larger alloy materials can be used when designing components, which is conducive to extending the service life of the components, which is particularly important for thin alloy wires.
3. Good sulfur resistance
Iron-chromium-aluminum has good corrosion resistance when exposed to sulfur-containing atmospheres and surfaces contaminated with sulfur-containing substances, while nickel-chromium will be severely corroded.
4. Inexpensive
Iron-chromium-aluminum does not contain scarce nickel and is much cheaper than nickel-chromium.
5. The main disadvantage of iron-chromium-aluminum alloys is their low high-temperature strength. As the temperature increases, their plasticity increases, causing component deformation.
6. Long service life
In the same high-temperature atmospheric environment, the lifespan of iron-chromium-aluminum components can be 2-4 times that of nickel-chromium components after pump repair.
7. High surface load
Because iron-chromium-aluminum alloys allow for high operating temperatures and long lifespans, the surface load of the components can also be higher, which not only speeds up the temperature rise but also saves alloy materials.
8. Good oxidation resistance
The Al2O3 oxide film formed on the surface of the chromium-iron-aluminum alloy has a dense structure and good adhesion to the substrate, and is not easily scattered or contaminated by water. In addition, Al2O3 has high resistivity and a high melting point, which determines that the Al2O3 oxide film has excellent oxidation resistance. The carbonization resistance is also superior to that of the Cr2O3 formed on the surface of the Ni-Cr alloy.
9. Low specific gravity
The specific gravity of FeCrAl alloy is lower than that of nickel-chromium alloy, which means that using FeCrAl to produce the same component saves more material than nickel-chromium alloy.
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