MOLD POWDER FOR CONTINUOUS CASTING OF AL-CONTAINING SUB-PERITECTIC STEEL, AND CONTINUOUS CASTING METHOD

A mold powder is provided which can prevent surface defects occurring in the surface of a slab of Al-containing sub-peritectic steel in which the Al content is 0.2-2.0 mass% and the carbon content is in the sub-peritectic region (0.08-0.17 mass%). This mold powder has CaO, SiO2, Na2O, Li2O, F (fluorine) and C (carbon) as basic components, and in the initial composition of the mold powder, ''CaO content (mass%)/ SiO2 content (mass%)'' is within a prescribed range with respect to Al content in molten steel, the Na2O content is less than or equal to 8 mass%, the Li2O content is 2-7 mass%, the ''Li2O content (mass%)/ Na2O content (mass%)'' is greater than or equal to 0.6, the F content is within a prescribed range with respect to the Na2O content and the Li2O content, the C content is 2-10 mass%, the viscosity at 1300 DEG C is 0.05-0.20 Pa*s, and the crystallization temperature is 1100-1250 DEG C. 本发明提供一种保护渣，其防止在Al含量为0.2～2.0质量％且碳含量在亚包晶区域(0.08～0.17质量％)的含Al亚包晶钢的铸片表面产生的表面缺陷。本发明的保护渣以CaO、SiO2、Na2O、Li2O、F(氟)、C(碳)为基本成分，