| 摘要 |
<p>PURPOSE:To improve the predicting accuracy of a cooling start temp. of a tapered steel slab and to reduce a temp. deviation of the slab at the end of cooling by predicting a cooling start temp. at plural dividing points in the slab longitudinal direction, considering the effect of a passing speed of the slab in a cooler. CONSTITUTION:A radiation thermometer 12 measures a temp. at plural dividing points in the longitudinal direction of a hot steel slab S prior to insertion of the slab S into a cooler 3. The measured temps. are inputted into a controlling calculator 4. Cooling conditions such as a cooling finishing temp., cooling speed by water cooling, and slab thickness are set in the calculator 4 and an optimum cooling condition for each dividing point is calculated. A slab passing speed according to the thickness of the slab S is corrected and a required cooling time is obtained based on the calculated cooling condition. In this method, the tapered slab S is totally cooled to a required temp.</p> |
