Patent ID: 10315245

Abstract:
Provided is mold flux that can prevent longitudinal cracks from forming on a surface of a slab upon continuous-casting hypo-peritectic steel, wherein CaO, SiO2, an alkali metal oxide and a fluorine compound are contained, 1.1≤(CaO)h/(SiO2)h≤1.9, 0.10≤(CaF2)h/((CaO)h+(SiO2)h+(CaF2)h)≤0.40 and 0≤(alkali metal fluoride)h/((CaO)h+(SiO2)h+(alkali metal fluoride)h)≤0.10 are satisfied, a solidification temperature is no less than 1300° C., and viscosity at 1450° C. is no more than 0.1 Pa·s.