| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the variation of the central segregation in the width direction of a slab. <P>SOLUTION: In a second section from a roll stand directly below a mold to a roll stand arranged at a position of a meniscus distance of 15m, provided that the specific water content in the wide direction range in which a bearing box ratio R satisfies 0≤R≤0.2 is defined as W<SB POS="POST">A</SB>, the specific water content in the width direction range in which a bearing box ratio R satisfies 0.2<R≤1 is defined as W<SB POS="POST">B</SB>and the bearing box ratio R is defined as R<SB POS="POST">B</SB>, W<SB POS="POST">B</SB>/W<SB POS="POST">A</SB>satisfies formula (1): 1.21R<SB POS="POST">B</SB>+0.76≤W<SB POS="POST">B</SB>/W<SB POS="POST">A</SB>≤2.61R<SB POS="POST">B</SB>+1.16. Further, provided that the specific water content in the range of A/4 from both the edge parts in the width direction of the slab in the second section is defined as We and the specific water content in the range other than the range of the A/4 from both the edge parts in the width direction is defined as Wm, 1.1≤We/Wm≤2.0 is satisfied. Further, in the third section where the time t[min.] from the passage of the slab through the meniscus satisfies 5≤t≤10, a roll gap is gradually widened, and bulging is performed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
