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2021-02-06
  • By: Shengchi Ferroalloys

What problems should be paid attention to during the use of casting recarburizer

In the smelting process, due to improper ingredients or charging and excessive decarburization and other reasons, sometimes the carbon content in the steel does not meet the requirements of the peak period, and then carbon is added to the molten steel. Commonly used recarburizers include recarburized pig iron, electrode powder, calcined petroleum coke powder, charcoal powder and Graphite Powder. When smelting medium and high-carbon steel grades in a converter, calcined petroleum coke with few impurities is used as a recarburizer. The requirement for the recarburizer for top-blown converter steelmaking is to have high fixed carbon, low ash, volatile, and sulfur, phosphorus, nitrogen and other impurities, and be dry, clean, and moderate in particle size. Therefore, when adding recarburizer, if the addition amount is wrong and the particle size of the recarburizer is wrong, it will definitely affect its final absorption rate.

If the particle size is too fine, it will burn easily. If it is too coarse, it will float on the surface of molten steel and will not be easily absorbed by molten steel. The particle size of induction furnace is 0.2-6mm, of which steel and other ferrous metals are 1.4-9.5mm, high-carbon steel requires low nitrogen, and the particle size is 0.5-5mm, etc. Specific requirements for smelting workpieces according to specific furnace types Specific judgment and selection of the details and so on.

The way of adding recarburizer is also different. If the adding method is wrong, it will also affect the final absorption rate.

The recarburizer is suitable for smelting in the induction furnace, but the specific use varies according to the process requirements.

(1) The recarburizer used in the smelting of the intermediate frequency electric furnace can be added to the middle and lower parts of the electric furnace according to the proportion or carbon equivalent requirements, and the recovery rate can reach more than 95%;

(2) If the amount of carbon is not enough to adjust the carbon content, first clean the slag in the furnace, then add a recarburizer, heat up the molten iron, electromagnetic stirring or manual stirring to dissolve and absorb the carbon. The recovery rate can be about 90%. The low-temperature recarburization process is adopted, that is, only a part of the charge is melted. When the molten iron temperature is low, all the recarburizers are added to the molten iron at one time, and the solid charge is used to press it into the molten iron to prevent it from exposing the iron. Liquid surface. This method can increase the carbon content of molten iron by more than 1.0%. 

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