| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for cooling a thick steel plate that achieve improvement of the quality of a cooled thick steel plate.SOLUTION: The method for cooling a thick steel plate of the present invention comprises a step of measuring the width-direction temperature distribution in a thick steel plate surface before being sprayed with cooling water, a step of estimating a temperature distribution in a plate thickness- direction internal position of a thick steel plate after being sprayed with cooling water on the basis of the temperature distribution before being sprayed with the cooling water and the water amount density distribution of a cooling header, and a step of adjusting the width-direction water amount density distribution of a cooling header on the surface side so as to reduce an estimated temperature deviation of the thick steel plate after being sprayed with cooling water in a plate thickness-direction internal position. The method for cooling a thick steel plate is characterized in that the step of estimating the temperature distribution after being sprayed with cooling water has a step of calculating a distribution of heat transfer coefficients in the surface of the thick steel plate considering the water amount density distribution and a step of deriving an estimated temperature distribution of a thick steel plate after being sprayed with cooling water in a plate thickness-direction internal position on the basis of the temperature distribution before being sprayed with the cooling water and the distribution of heat transfer coefficients.SELECTED DRAWING: Figure 4 |
