| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the deterioration due to wear of a support roll, deposition of scales, and surface crack of cast slabs. <P>SOLUTION: In a roll back-surface cooling region R in air cooling zone from an end of secondary cooling zone of a vertical bending type or a bending type bloom continuous casting machine to an end of correcting passage part, a spray width ratio W<SB POS="POST">1</SB>/W<SB POS="POST">0</SB>of cooling water to an opposite reference side roll 41 is 0.60 or more, a spray length ratio 2 L<SB POS="POST">1</SB>/πL<SB POS="POST">d1</SB>is 0.30 to 1.0, and a density of cooling water amount X<SB POS="POST">1</SB>is 0.2 to 0.8 [Nm<SP POS="POST">3</SP>/h/m<SP POS="POST">2</SP>]. Further in the roll back-surface cooling region R in air cooling zone, cooling water is sprayed to the opposite reference side roll 41 by using a mist nozzle. In the roll back-surface cooling region R in air cooling zone, a spray width ratio W<SB POS="POST">2</SB>/W<SB POS="POST">0</SB>of cooling water to a reference side roll 42 is 0.60 or more, a spray length ratio 2 L<SB POS="POST">2</SB>/πL<SB POS="POST">d2</SB>is 0.20 to 1.0, and a density ratio of cooling water amount X<SB POS="POST">2</SB>/X<SB POS="POST">1</SB>is 1.0 to 1.60. <P>COPYRIGHT: (C)2013,JPO&INPIT |
