Advantages of high-resistance electric heating alloys

Release time: 2024-03-21

There are two main categories of electric heating alloys: ferrochromium-aluminium alloys with a ferrite organisation; and nickel-chromium alloys with an austenitic organisation. These two types of alloys due to different organisational structure, in the performance is not the same. But as electric heating materials they each have more advantages, and thus in various countries to get a large number of production and widely used.
First, the characteristics of iron chromium aluminium electric heating alloy:
1, the use of high temperature in the atmosphere
Iron-chromium-aluminium electric heating alloy in the HRE alloy of the highest operating temperature of up to 1400 ℃, and nickel-chromium electric heating alloy in the Cr20Ni80 alloy of the highest operating temperature of 1200 ℃.
2、High resistivity
Iron-chromium-aluminium alloy resistivity than the nickel-chromium alloy is high, in the design of components can be used in the larger size of the alloy material, which is conducive to prolonging the service life of the components, for the fine alloy wire this is particularly important.
3, good sulphur resistance
Sulfur-containing atmosphere and surface contaminated by sulfur-containing substances when the iron chromium aluminium has good corrosion resistance, while nickel-chromium will be severely eroded.
4, cheap
Iron-chromium aluminium does not contain nickel, which is scarce, and the price is much cheaper than nickel-chromium.
5, the disadvantage of iron chrome aluminium alloy is mainly high temperature strength is low, as the temperature rises its plasticity increases, causing component deformation.
6, long service life
In the atmosphere of the same higher use temperature, pump repair iron chrome aluminium components life can be 2-4 times as long as the nickel-chrome components.
7、High surface load
Because of the iron chrome aluminium alloy allows the use of high temperature, long life, so the surface load of the components can also be higher, which not only makes the temperature rise fast can also save alloy materials.
8、Good anti-oxidation performance
Al2O3 oxide film generated on the surface of ferrochrome aluminium alloy has dense structure and good adhesion performance with the substrate, which is not easy to scatter back to the flowers and water and cause pollution. In addition, Al2O3 has high resistivity and high melting point, which determines that Al2O3 oxide film has excellent antioxidant property. Carburisation resistance is also better than Cr2O3 generated on the surface of Ni-Cr alloy.
9、Specific gravity is small
The specific gravity of FeCrAl alloy is smaller than that of Nichrome alloy, which means that the production of the same components with FeCrAl is more material-saving than Nichrome.