How to select the iron chromium aluminum electric furnace wire inside the carburizing furnace

How to select the iron chromium aluminum electric furnace wire inside the carburizing furnace

Carburization furnace is a type of heat treatment furnace that requires the use of electric furnace wires. However, during the process of selecting suitable electric furnace wires, one has been troubled by finding satisfactory ones. Here, Yancheng Songtai helps you clarify your mind and easily select satisfactory high-temperature electric furnace wire products.

When selecting materials for carburizing furnaces, it is important to ensure that the electric heating alloy is not directly exposed to a carbon atmosphere. Due to the high chromium content of iron chromium aluminum alloy, in actual use, if carbon directly infiltrates into the iron chromium aluminum alloy, it will react with the chromium in the alloy to generate a compound of carbon and chromium, which will be distributed at the grain boundaries. Due to the volume expansion of the compound after formation, the alloy will experience "bulging" phenomenon, greatly shortening the alloy's lifespan.

Cheng Shi found that the heating elements of the carburizing furnace should be strictly separated from the carbon atmosphere to prevent electric wire carburization. If a sealed design is adopted, it is best to install the iron chromium aluminum electric furnace wire into the sealing device and perform a pre oxidation treatment at 950 ℃ for about 6 hours before sealing. After the surface of the iron chromium aluminum electric furnace wire turns silver gray or white, it can be sealed and used. However, it should be noted that the furnace wire will become brittle after pre oxidation. Once pre oxidation treatment is carried out, it cannot be deformed again and cannot be subjected to significant external impact.

Firstly, it is necessary to understand the characteristics of iron chromium aluminum electric furnace wire electric heating alloy materials:

① High usage temperature, such as the maximum usage temperature of HRE iron chromium aluminum alloy wire in the atmosphere can reach 1400 ℃;

② Long service life;

③ The allowable surface load is high;

④ Good antioxidant performance, and the AI2O3 film formed after oxidation has good chemical resistance and high resistivity;

⑤ Specific gravity less than nickel chromium alloy;

⑥ High resistivity;

⑦ Good sulfur resistance;

⑧ The price is significantly lower than nickel chromium alloy;

⑨ The disadvantage is that as the temperature increases, it exhibits plasticity and low strength at high temperatures.

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