Mold powder and continuous casting method for continuous casting of Al-containing apocrystalline steel

摘要

Provided is a mold powder that prevents surface defects that occur on the surface of a slab of Al-containing apo-crystalline steel having an Al content of 0.2 to 2.0 mass% and a carbon content of an apo-crystalline region (0.08 to 0.17 mass%). The mold powder according to the present invention has CaO, SiO 2 , Na 2 O, Li 2 O, F (fluorine), and C (carbon) as basic components, and in the initial composition of the mold powder, “CaO content (mass% )/SiO 2 content (mass %)" is a predetermined range with respect to Al content of molten steel, Na 2 O content is 8 mass % or less, Li 2 O content is 2 mass % or more and 7 mass % or less, "Li 2 O content (mass %)/Na 2 O content (mass %)" is 0.6 or more, F content is a predetermined range with respect to said Na 2 O content and said Li 2 O content, and C content is 2 mass % or more 10 The mold powder whose viscosity in mass % or less, 1300 degreeC is 0.05-0.20 Pa*s, and crystallization temperature is 1100-1250 degreeC.