| 摘要 |
PURPOSE:To prevent the development of surface defect in a cast slab and to reduce the inclusion by satisfying the specific equation about the distance from a meniscus to a motor core center of stirring apparatus and specifying the horizontal direction flow speed of molten steel in a mold. CONSTITUTION:In case of casting continuously the molten stainless steel containing >=0.1wt% Ti, the setting height of motor core is adjusted by adjusting hydraulic pressure supplying into the hydraulic cylinder 11 and the electromagnetic stirring apparatus holding to the prescribed height is used. And, the distance (h) from the meniscus to the center of motor core 1 for the stirring apparatus is decided, so as to satisfy the equation. Next, the range of stirring flow speed by horizontal spiral flow is provided to 15-40cm/sec at the position of 2Xh. In this way, the development of surface defect in the cast slab is pre4vented and the inclusion caught on the surface layer of cast slab is reduced. In this equation, (h) for the distance (m) toward casting direction from the meniscus to the center of core for the linear motor K for the solidification constant mm/min<1/2> and D for solidified shell thickness mm at the distance 2h from the meniscus under consideration of 10-30mm this value range, are expressed. |
