| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an immersion tube for a degassing treatment device having a long service life.SOLUTION: Provided is a stud comprising: the fine first stud 6 fixed to the upper part of the immersion tube; and the thick second stud 7 fixed to the lower part of the immersion tube. The thick second stud 7 is strong to erosion because of its thickness, exists as a stud, continues to hold unshaped refractories, and has a long service life. Further, since the first stud 6 is fine, it is economical.</p> |
