フラックスインジェクションによる Si キルド鋼の脱酸

概要

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Deoxidation flux powder is injected into a silicon killed steel bath in a 200ton ladle. The results obtained are as follows : (1) Injection of CaO-Al_2O_3-SiO_2 flux powder lowers the total oxygen content to the same level as RH-degassed steel. (2) The flux injection of 2kg/t steel is good enough for this deoxidation. (3) The quality of flux-injected products is the same as RH-degassed ones. (4) The oxygen probe measurement reveals that the flux does not contribute to the reduction of oxygen content dissolved in molten steel. This fact is also proved by flux injection with different silica contents. (5) The E.P.M.A. observation shows that oxide inclusions are caught by the flux powder and their rising speed up to the bath surface increases. (6) Based on the above-mentioned phenomena, a simple deoxidation model is proposed which explains well the change of chemical compositions of oxide inclusions during the early stage of flux injection.
社団法人日本鉄鋼協会の論文
1979-07-01