Electric heating alloy is a functional material that converts electrical energy into thermal energy. Its maximum working temperature can reach 1400 ℃. It is used to manufacture various electric heating elements in the fields of metallurgy, machinery, petrochemicals, electrical, construction, military industry, home appliances, etc.
There are two main types of electrothermal alloys: one is ferrochrome aluminum alloy with ferrite structure; the other is nickel-chromium alloy with austenite structure.
1. High temperature in the atmosphere
The maximum service temperature of HRE alloy in iron chromium aluminum electric heating alloy can reach 1400 ℃, while the maximum service temperature of Cr20Ni80 alloy in nickel chromium electric heating alloy is 1200 ℃.
2. Long service life
At the same high service temperature in the atmosphere, the life of the iron-chromium-aluminum element can be 2-4 times that of the nickel-chromium element.
3. High surface load
Because the iron-chromium aluminum alloy allows high temperature and long life, the surface load of the component can also be higher, which not only makes the temperature rise faster but also saves alloy materials.
4. Good oxidation resistance
The Al2O3 oxide film formed on the surface of the iron-chromium aluminum alloy has a compact structure and good adhesion to the substrate, and it is not easy to return to cause pollution. In addition, Al2O3 has a high resistivity and a high melting point. These factors determine that Al2O3 oxide film has excellent oxidation resistance. Carburization resistance is also better than Cr2O3 formed on the surface of nickel-chromium alloy.
5. Small proportion
The proportion of iron-chromium-aluminum alloy is smaller than that of nickel-chromium alloy, which means that the use of iron-chromium-aluminum is less material than nickel-chromium when making the same components.