| 摘要 |
PURPOSE:To prevent defects generating in the central part of sheet width of a slab and to improve the quality of a product by rolling the slab by setting a draft of horizontal rolling by a specific equation with respect to a draft of edging to be performed just before the horizontal rolling. CONSTITUTION:In sizing a slab S by using edging mills 5, 5' for subjecting the slab S to rolling reduction in the width direction and a horizontal mill 6 for subjecting it to rolling reduction in the thickness direction; the slab S is rolled by setting a draft gammaH of horizontal rolling by the following equation with respect to a draft gammaV of sizing to be performed just before the horizontal rolling. That is, the gammaH is set to gammaH>=-0.2+1.7gammaVo, when flat vertical rolls are used for edging, and gammaH>=-0.4+0.8gammaVo.
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