METHOD FOR CONTROLLING COOLING OF STEEL SHEET AND DEVICE FOR MANUFACTURING STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a method for controlling cooling of a steel sheet which highly accurately predicts a steel sheet temperature and controls the steel sheet temperature after cooling to a prescribed level by a method for calculating specific heat of the steel sheet without predicting a transformation rate.

SOLUTION: The method for controlling cooling of a steel sheet comprises controlling a cooling water amount based on a temperature prediction calculation result of a steel sheet and controlling a steel sheet temperature after cooling to a prescribed temperature using a cooling device for jetting cooling water while conveying a high temperature steel sheet heated to a transformation point Ac3 or higher. The predicted temperature of the steel sheet is calculated by using specific heat of the steel sheet derived by analyzing steel sheet temperature actual values before and after cooling measured at an inlet side and an outlet side in the cooling device, and steel sheet temperature actual values measured at one or more spots in the cooling device.

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