| 摘要 |
PURPOSE:To drastically improve the casting efficiency, to obtain the good surface quality and the uniform inner structure and to eliminate the defect in a core part by adopting a position higher by a static molten steel head height corresponding to the atmospheric head than a casting surface as a specifying point. CONSTITUTION:The molten steel supplied into a mold 3 from a ladle 1 through a tundish 2 is cooled with the mold 3 and formed to a cast slab 6 while forming a solidified shell and drawn with pinch rolls 10 and guide rolls 9. In such a bending type continuous casting, the bending length in a drawing locus of the cast slab is made to be >=1/2 of the circumference of circle, and the cast slab is drawn out to the position higher than the casting surface. Then, the position higher by 1.4m of the static molten steel head height corresponding to the atmospheric pressure head than the casting surface L is made to be the specific point Q and solidified shell thickness ratio alpha=2d/A at the Q point is made to be 0.25-0.85. Wherein, (d) is the solidified shell thickness in the cast slab at the Q point and A is short width size in the cross section of the mold. |
