| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve the reduction of a cost caused by shortening of a degassing-treating time by accurately assuming degassing components during treating, in the degassing treatment of molten steel using a vacuum-degassing apparatus. <P>SOLUTION: A method for performing the vacuum-degassing treatment to the molten steel 6 by immersing an immersion tube 3 arranged at the lower part of a vacuum vessel 4 into the molten steel 6 includes a process in which: exhausting gas speeds in the plurality of times, of the exhaust gas component in the exhaust gas 12, are calculated in the exhausting system 7 connected with the vacuum vessel 4; and the relation between the plurality of calculated exhaust gas speeds and the corresponded times, is obtained; and from this relation, the concentration of the targeted component in the molten steel 6 is assumed. The relation between the plurality of calculated exhausting gas speeds and the corresponded times, is determined by a function, and the concentration of the targeted component in the molten steel 6, is assumed by using the relation between the concentration of the targeted component in the molten steel 6 and the time obtained from this function. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
