| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.37 ( October 1997 ) Rolling Technology and Modernization of Chiba Works ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Endless Hot Strip Rolling in the No. 3 Hot
Strip Mill at the Chiba Works Hideyuki Nikaido, Shigeru Isoyama, Nobuaki Nomura, Kanji Hayashi, Kazuo Morimoto, Hideo Sakamoto |
| Synopsis: Fully continuous finishing rolling, so called "endless hot strip rolling", started at No. 3 hot strip mill in Chiba Works of Kawasaki Steel for the first time in the world, depending on the development of sheet bar joining process and establishment of continuous rolling system. For joining the head and tail ends of sheet bars, an induction heating and an upsetting method was adopted. This method made it possible to join the sheet bar ends in a short time, like 5 s. Strength of joint is equal to its mother materials and no scale residue was found accross the joint. Accordingly, an ideal joining technology was established. Sheet bar ends are joined before reaching the finishing mill while the bar moving. Continuous finishing hot strip rolling is performed under an uninterrupted tension between rolling stands. As a result, product quality, like thickness accuracy, productivity and stability of rolling were extremely improved. In addition, ultra-thin strip and thin-wide strip have been able to be produced without trouble. |
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