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심상철 ( Sang Chul Shim ),조중욱 ( Jung Wook Cho ),황상택 ( Sang Taek Hwang ),김광천 ( Kwang Chun Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 대한금속·재료학회지 Vol.46 No.10
The behavior of hydrogen in the steel making process was investigated. The relation between the composition of ladle slag and hydrogen concentration in molten steel was considered. The hydrogen distribution ratio between ladle slag and molten steel was increased with increasing basicity of the slag; it was about 20 when the basicity of slag was 15. Hydroxyl capacity measured from the hydrogen distribution ratio between slag and the molten steel was comparatively corresponding to the value of hydroxyl capacity measured by the equilibrium reaction of slag and H2O gas. However, it is considerably different from the value calculated by regular solution model. The influence of hydrogen on a sticking type breakout is considered. The effect of hydrogen and H2O gas on the crystallization behavior of mold powder was investigated by DHTT(Dual hot thermocouple technique). As a result, it was proved that mold powder could be crystallized by H2O gas in the atmosphere. Therefore, it is concluded that H2O gas in the atmosphere can be a possible cause of the sticking type breakout that occasionally occurs in the continuous casting process.
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