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

Provided is a mold powder which prevents surface defects from occurring on a surface of a cast slab of Al-containing hypo-peritectic steel having an Al content of 0.2% by mass to 2.0% by mass Al and a carbon content in a hypo-peritectic region (0.08% by mass to 0.17% by mass).A mold powder according to the present invention f contains, as basic components, CaO, SiO2, Na2O, Li2O, F (fluorine), and C (carbon). In the initial composition of the mold powder, "CaO content (mass percent)/SiO2 content (mass percent)" is in a predetermined range with respect to the Al content of molten steel, the Na2O content is 8% by mass or less, the Li2O content is 2% by mass to 7% by mass, "Li2O content (mass percent)/Na2O content (mass percent)" is 0.6 or more, the F content is in a predetermined range with respect to the Na2O content and the Li2O content, the C content is 2% by mass to 10% by mass, the viscosity at 1,300 °C is 0.05 Pa·s to 0.20 Pa·s, and the crystallization temperature is 1,100 °C to 1,250 °C.