1. Nickel chromium alloy with austenitic structure;

2. Iron chromium aluminum alloy with ferrite structure.

1, Nickel chromium electric heating alloy

1. High temperature strength. The high-temperature strength of nickel chromium alloy is higher than that of iron chromium aluminum, and it is not easy to deform when used at high temperatures. There is a large range of options for component layout.

2. Its plasticity remains good after long-term use. After long-term use, nickel chromium alloy will not become brittle after cooling, so the heating element is more reliable to use and easy to repair after damage.

3. High emissivity. The radiation rate of fully oxidized nickel chromium alloy is higher than that of iron chromium aluminum alloy. Therefore, when the surface load is the same, the temperature of nickel chromium alloy components is slightly lower than that of iron chromium aluminum alloy.

4. Non magnetic. Nickel chromium alloy is not magnetic, which is more suitable for some instruments used at low temperatures. Iron chromium aluminum alloy must be above 600 degree to be non magnetic.

5. Good corrosion resistance. Nickel chromium alloy is more resistant to corrosion than non oxidized iron chromium aluminum alloy (except for sulfur containing atmospheres and certain controllable atmospheres).

2, Iron chromium aluminum electric heating alloy

1. High temperature when used in the atmosphere. The maximum operating temperature of the iron chromium aluminum electric heating wire 0Cr27AL7Mo2 can reach 1400 degree , while the maximum operating temperature of the nickel chromium wire Cr20Ni80 is 1200 degree .

2. Long service life. Under the same usage at higher temperatures in the atmosphere, the lifespan of iron chromium aluminum can be 2-4 times that of nickel chromium.

3. High surface load. Due to the high temperature and long service life allowed by iron chromium aluminum alloy, the surface load of the components can also be higher, which not only makes the temperature rise faster 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 and good adhesion to the substrate, which is not easy to disperse and cause pollution. In addition, the high resistivity and melting point of Al2O3 determine that the Al2O3 oxide film has excellent oxidation resistance. The anti carburizing performance is also better than the Cr2O3 generated 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 saving than using nickel chromium.

6. High electrical resistivity. The resistivity of iron chromium aluminum alloy is higher than that of nickel chromium alloy. When designing components, alloy materials with larger specifications and diameters can be selected, which is beneficial for extending the service life of the components, especially for fine alloy wires.

7. Good sulfur resistance. Iron, chromium, and aluminum have good corrosion resistance to sulfur-containing atmospheres and surfaces contaminated with sulfur-containing substances, while using nickel chromium can cause severe corrosion.

8. The price is cheap. Iron chromium aluminum is relatively cheaper than nickel chromium due to its lack of scarce nickel.