| 摘要 |
The present invention relates to a mold flux and a continuous casting method using the same, and a slab manufactured using the same, and comprises a composition containing SiO2, CaO, MgO, Al2O3, Na2O, F and nickel (Ni) oxides. A coating layer comprising nickel (Ni) oxide is formed on the surface of the slab while supplying, to the upper part of a molten steel, a mold flux containing 5 wt% to 40 wt% of nickel (Ni) oxide with respect to the total weight of the composition, whereby it is possible to provide a slab capable of preventing surface defects, comprising a surface part from the outermost side to the inner side of the slab and a center part from the surface part to the center of the slab on the basis of the thickness direction of the slab, with the surface part having a higher Ni concentration than the center part. That is, by forming a Ni oxide-enriched layer having a low oxygen affinity on the surface of the slab, the solidification behavior of steel is controlled so as to cause a hyperperitectic reaction with low solidification and shrinkage on the surface of the slab, whereby it is possible to prevent defects that may occur due to the enrichment of copper of the molten steel on the surface of the slab. Accordingly, it is possible to reduce the amount of a metal-containing material used as compared with conventional art in which a material containing a metal such as Ni is mixed with a molten steel in order to prevent defects that may be caused by copper, thereby preventing an increase in the manufacturing cost due to the use of a material containing a high-priced metal. |
