Clean Steel Production Technology for Ultra Low Carbon Steel

oleh Hyeon-Soo Choi, Sungmo Seo , Ju Han Choi, Seok-Young Park, Jung-Hyung Park, Kwang-Chun Kim

Penerbit - POSLAB, POSCO, Korea

Kategori - Novel Am

Steel cleanness of ultra low carbon steel is affected by many factors such as oxygen blowing in RH, impurities of Fe alloys and slag deoxidation practice. Oxygen blowing in RH is one of the detrimental factors that deteriorate steel cleanness. For minimization of oxygen blowing in RH, following countermeasures have been applied. Setting up a standard of end point temperature and free oxygen contents in molten steel from a BOF, controlling of temperature in the bubbling station and slag deoxidation after bubbling are applied to control steel temperature and free oxygen contents of molten steel in RH arrival and these countermeasures result in the reduction of oxygen blown ratio under 5%. The effect of impurities in alloys such as oxides in Ti sponge was identified and countermeasure has been applied to solve nozzle clogging. In addition, the secondary slags killing practices was done to improve steel cleanness and above measures were confirmed for improving nozzle clogging and defects in cold rolled products that caused by inclusions from steelmaking process.

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