| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the generation of distortion caused by the deviation of the temp. of a steel sheet subjected to hot straightening after rolling and thereafter subjected to air cooling. SOLUTION: On the outlet side of a rolling mill, the temp. in the sheet width direction of a steel sheet L is measured, from the temp. distribution, the temp. dropping widthΔW an the edge temp. dropping amt.ΔT are determined, from corelation between the previously set generation of distortion and the temp. distribution, center part cooling temp.ΔTct is determined, and, furthermore, based on the width W of the steel sheet L and a marginα, the cooling widthΔWct (=W-2.ΔW-α) is determined. By a cooling device, water is poured into the region of the cooling widthΔWct of the center of the steel sheet L, air is sprayed on the regions other than that, e.g. on the edge sides, the flowing of the water for cooing poured into the cooling region of the center into the edge sides is prevented by the air, and temp. control is executed in such a manner that, as to the temp. distribution in the steel sheet L, the temp. of the edge sides is lower than that of the vicinity of the center, and also, the highest temp. part is located on the space between the edge parts and the center part.</p> |
