What are the advantages of iron chromium aluminum electric heating wires?

What are the advantages of iron chromium aluminum electric heating wires?

1. Using high temperatures in the atmosphere

The maximum operating temperature of HRE alloy in iron chromium aluminum electric heating alloy can reach 1425 ℃, while the maximum operating temperature of Cr20Ni80 alloy in nickel chromium electric heating alloy is 1200 ℃.

2. Service life

At the same high operating temperature in the atmosphere, the lifespan of iron chromium aluminum components can be 2-4 times that of nickel chromium components.

3. High surface load

Due to the high temperature and long service life of iron chromium aluminum alloy, the surface load of the components can also be higher, which not only allows for faster heating but also saves alloy materials.

4. Good antioxidant performance

The Al2O3 oxide film formed on the surface of iron chromium aluminum alloy has a dense structure, good adhesion performance with the substrate, and is not easy to cause pollution due to scattering. In addition, the high electrical resistivity and melting point of Al2O3 determine that the Al2O3 oxide film has excellent oxidation resistance and better carburization resistance than the Cr2O3 formed on the surface of nickel chromium alloy.

5. Small specific gravity

The specific gravity of iron chromium aluminum alloy is smaller than that of nickel chromium alloy, which means that using iron chromium aluminum to make equivalent components is more material efficient than using nickel chromium.

6. High electrical resistivity

The electrical resistivity of iron chromium aluminum alloy is higher than that of nickel chromium alloy. When designing components, larger specification alloy materials can be selected, which is beneficial for extending the service life of the components. This is particularly important for fine alloy wires. When selecting materials with the same specifications, the higher the resistivity, the more material is saved, and the smaller the position of the components in the furnace. In addition, the electrical resistivity of iron chromium aluminum alloy is less affected by cold processing and heat treatment than nickel chromium alloy.

7. Good sulfur resistance

Iron, chromium, and aluminum have good corrosion resistance when exposed to sulfur-containing atmospheres and surfaces contaminated with sulfur-containing substances, while nickel and chromium are severely corroded.

8. Cheap price

Iron chromium aluminum is much cheaper than nickel chromium because it does not contain scarce nickel. The main drawback of iron chromium aluminum alloy is its low high-temperature strength, and its plasticity increases with increasing temperature. Materials above 1000 ℃ often elongate slowly due to their own weight, causing component deformation. In addition, after long-term use at high temperatures and cooling with the furnace, it becomes brittle as the grains grow and cannot be bent in a cold state. These shortcomings should be avoided and overcome in both design and use.

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