| 摘要 |
PURPOSE:To descale efficiently a steel strip by bending the steel strip to be rolled at a specific flexural elongation rate and descaling the same by the injection of pressure water thereto prior to finish rolling of the steel sheet. CONSTITUTION:The steel sheet 2 to be rolled is passed between rolls 10 disposed above and below via pinch rolls 12 and is so bent that the flexural elongation rate attains >=7%. A position control device 15 is connected to the upper and lower rolls 10 to adjust the position of the rolls 10 in accordance with the output signal from an arithmetic processing unit 16, thereby controlling automatically the flexural elongation rate to >=7% at all times. The scale 20 of the sheet 2 is thereby finely cracked 21. The pressure water is injected onto such sheet 2 from finishing scale breakers 11. An injection pressure regulator 14 is connected to the breakers 11 to adjust and control the injection pressure by the output signal from the unit 16. The easy stripping and removal of the scale 20 by the low pressure water is thus made possible.
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