CONTINUOUS CASTING METHOD, AND EXTRA-THICK STEEL PLATE EXCELLENT IN INNER QUALITY AND PRODUCING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To make unnecessary a large scale of a rolling mill itself and a huge rolling-reduction facility in a continuous caster.;SOLUTION: This continuous casting method for molten steel is performed as the followings. After bulging a cast slab 1 before rolling-reduction, when the solid-phase ratio at the center of the thickness in the cast slab 1 is ≥0.80, the center part of the width in the cast slab 1 is rolling-reduced by 3-15 mm. In this producing method, since a porosity in the cast slab obtained by continuously casting from the molten steel, is reduced by using comparatively simple rolling-reduction facility in the continuous casting, the extra-thick steel plate having good inner quality without generating UST defect can be produced by using the existing rolling mill for thick plate.;COPYRIGHT: (C)2006,JPO&NCIPI