| 摘要 |
PURPOSE:To reduce the partial pressure of CO in a vapor phase part and to improve decarburization efficiency in a dilute decarburization method by blowing the diluting gas of a specific ratio of the content of gaseous oxygen to be blown into molten steel into the vapor phase in a furnace. CONSTITUTION:In the stage of dilute decarburization of steel, a diluting gas such as N2 and Ar or air at >=20% bottom blowing oxygen is blown from a furnace top into a vapor phase part in a decarburization period. Then decarburization efficiency is improved, and the time of the decarburization period and the unit of a reducing agent are decreased. In this method, if the % of Si which is a slag forming element is regulated to <=0.15% to regulate the amt. of the slag to be carried in to <=10kg/t-molten steel, the decarburization efficiency is further improved. |
