Ultra-low carbon IF molten steel peroxidation treatment method

Abstract

The invention relates to an ultra-low carbon IF molten steel peroxidation treatment method. The ultra-low carbon IF molten steel peroxidation treatment method comprises the following steps: monitoring an oxygen concentration value of a converter terminal point before converter molten steel tapping, and adding a coke powder according to a first preset proportion in the converter tapping process if the oxygen concentration value of the converter terminal point is greater than a preset concentration threshold value; monitoring a point blowing signal of the converter before converter molten steel tapping, and adding the coke powder according to a second preset proportion in the converter tapping process if the point blowing signal is received; starting the converter bottom blowing after the converter blowing is finished and a gun is lifted; adding a steel slag modifier according to a first preset dosage after converter tapping; starting steel ladle bottom blowing after the steel slag modifier is added; and performing RH vacuum treatment on the molten steel, and adding the steel slag modifier according to a second preset dosage after the treatment is completed. According to the invention, the oxygen content of the molten steel after converter tapping can be effectively reduced, and the degree of peroxidation of the molten steel is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for treating ultra-low carbon IF molten steel peroxidation. Background technique [0002] In recent years, with the rapid growth of the automobile market, the market demand for automobile sheets is also increasing. In the production of automobile sheets, the requirements for component C are getting lower and lower, especially the requirements for inclusions in steel are more stringent. [0003] In order to ensure that the finished product of ultra-low carbon IF steel meets the quality standards, the converter needs low-carbon and high-oxygen tapping. At the same time, in order to ensure the pouring temperature under the BOF-RH-CCM process route, the converter also needs to increase the end point temperature. [0004] However, in the process of production in accordance with the composition, oxygen and temperature requirements of the entire smelting process of ultra-lo...

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Problems solved by technology

[0004] However, in the process of production in accordance with the composition, oxygen and temperature requirements of the entire smelting process of ultra-low carbon IF steel, it often occurs that the oxygen at the end of the converter is too high, or the blowing is forced to blow due to the low temperature after the first blowing , leading to peroxidation of molten steel

According to the analysis, the inclusions in the molten steel of the peroxidation furnace exceed the standard seriously, mainly manifested in the poor pourability of the molten steel, and the nozzle nodules are obvious during the pouring process. The stability, quality assurance, and user satisfaction all bring adverse effects

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