발간논문

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Vol.32, No.5, 513 ~ 522, 1994
Title
Behavior of Oxygen and Non - Metallic Inclusion in Ultra Low Carbon Steel
손재웅Jae Woong Son, 이광근Kwang Keun Lee, 노광현Kwang Hyun Ro
Abstract
The behavior of Al₂O₃ based inclusion was studied during the production of ultra low carbon steel under RH degasser of 250 ton. The optimum condition to improve the cleanliness of ultra low carbon steel, the effect of decarburization type and ladle slag composition on the total oxygen content in ladle treatment are as follows. The optimum slag composition after RH treatment to achieve the total oxygen content less than 0.0012% should be 48% CaO, 45% Al₂O₃ and 7 % SiO₂ in slag composition. More than 1.9 watt/ton in stirring power and 6 in slag basicity were required. The main types of inclusion in slab were SiO₂ and Al₂O₃ mixed with TiO₂. It was revealed that titanium in molten steel reacted with inclusions containing FeO or MnO and the content of TiO₂ in inclusions gradually increased during the process transfer.
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