| 摘要 |
A primary object of this invention is, upon continuous casting of Ti-containing hypo-peritectic steel, to provide mold flux that can prevent longitudinal cracks from forming on a surface of a slab. The mold flux of this invention contains CaO, SiO 2 , an alkali metal oxide and a fluorine compound as major components; f(1), f(2) and f(3), which are calculated from the initial chemical composition, are (1.1 - 0.5 × T) to (1.9 - 0.5 × T), 0.05 to 0.40 and 0 to 0.40, respectively, if the Ti content of the molten steel (mass%) is T; the TiO 2 content in the melting state during the casting is no more than 20 mass%; and the ratio of the first peak height of perovskite to the first peak height of cuspidine in the mold flux film is no more than 1.0. |
