Patent ID: 9364879
Filing Date: 2016-06-14
CPC Classification: B21B,C21D

Claim Text:
1. A method of cooling control for cooling a steel plate by a cooling apparatus with cooling water immediately after rolling, wherein the steel plate comprises a first surface and a second surface, wherein the first surface and the second surface are on opposite sides of the steel plate, the method comprising: a cooling schedule setting step of setting a cooling schedule required for cooling said steel plate to a predetermined temperature for a plurality of positions along a length of said steel plate inside said cooling apparatus, wherein the cooling schedule setting step includes measuring a temperature of the first or second surface of said steel plate by a thermometer disposed at an entry-side of said cooling apparatus, and calculating temperatures of said steel plate at the plurality of positions at a time when said steel plate passes through said cooling apparatus based on the temperature of the first or second surface; a heat transfer coefficient calculation step of calculating a first heat transfer coefficient of the first surface of said steel plate and a first surface temperature of said first surface based on the temperature in the cooling schedule set by said cooling schedule setting step and a first cooling water density for cooling said first surface of said steel plate; a ratio calculation step of calculating a ratio between said first cooling water density and a second cooling water density in relation to each of the plurality of positions along the length of said steel plate, wherein the ratio calculation step comprises: a cooling water amount controlling step of controlling the amounts of cooling water for cooling said steel plate passing through said cooling apparatus based on the ratio calculated by said ratio calculation step.