| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an LF (ladle furnace) treating method dissolving such problems as to delay the progresses of deoxidation and desulfurization, extend treating time, lower inclusion absorbing performance of slag and increase inclusion in a steel and generation of clogging to a CC nozzle, in the case of non-adding fluorite. <P>SOLUTION: The slag at the initial stage of the LF treatment is made to become a composition range having low fused point by mixing a complex slag-making agent selecting the composition containing CaO, Al<SB>2</SB>O<SB>3</SB>, Al, SiO<SB>2</SB>and MgO into a ladle during tapping from an electric furnace so as to sufficiently become fused state by forming the slag with the molten steel. Successively, lime, calcium aluminate and deoxidizing agent are added so that the slag keeps in the fused state and high fluidity state and thus, the LF treatment having the same state as the time using the fluorite can be obtained. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
