| 摘要 |
A mold flux for continuous casting contains SiO2, T.CaO, Al2O3, and MgO as main components, and contains one or more alkali metal oxides, and further contains a component F, wherein the ratio of the content of T.CaO to that of SiO2 is from 0.7 to 2.0, the content of Al2O3 is 35% or less, the content of MgO is 20% or less, the content of the total alkali metal oxides is 8% or less, and the content of F is 7% or less, and the respective content ratios represented by Formulae (b) to (e) satisfy Formula (a): 0.63+2.51×YAl2O3 = YCaO/YSiO2 = 1.23+2.51×YAl2O3 (a); YSiO2 = XSiO2/(XSiO2+XCaO+XAl2O3+XMgO) (b); YCaO = XCaO/(XSiO2+XCaO+XAl2O3+XMgO) (c); YAl2O3 = XAl2O3/(XSiO2+XCaO+XAl2O3+XMgO) (d); and YMgO = XMgO/(XSiO2+XCaO+XAl2O3+XMgO) (e). By performing continuous casting of round billets using the mold flux having this configuration, the occurrence of blowhole defects and longitudinal cracks can be effectively prevented. |
