Direct hardening device for steel plate |
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| 申请号 | JP350283 | 申请日 | 1983-01-14 | 公开(公告)号 | JPS59129717A | 公开(公告)日 | 1984-07-26 |
| 申请人 | Nippon Steel Corp; | 发明人 | OONO TAKAHIDE; UCHINO KOUICHI; | ||||
| 摘要 | PURPOSE:To provide a titled device which improves extremely stably and highly material quality when water cooling is performed right after hot rolling by disposing devices for detecting rate of transformation from the austenite state to ferrite of a steel plate under hardening to a hot rolling device and a water cooling device CONSTITUTION:The device of this invention is constituted of a heating furnace 1, hot rolling mills 2, 3, a hot leveler 4 and a cooling device 5. Transformation rate meters 6 are disposed just before the device 5 and if necessary in the device 5. The rate of transformation from the austenite state to ferrite of a steel plate subjected to heating and rolling is first detected from the rate of a change in the magnetic flux density of the meter 6 in front of the device 5 upon passage of the steel plate through the leveler 4. The rate of said transformation is measured and is reflected to the rolling temp. of the succeeding rolling mill so that the rate of transformation at the point of time of cooling attains a required best value. | ||||||
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