METHOD FOR CASTING FERRITIC STAINLESS STEEL

PURPOSE:To stably mass-produce a continuously cast slab having fine recrystallized structure, which the surface defect is not developed at the time of deep draw working by cooling the surface layer of cast slab formed in both end opening mold at >=10 deg.C/sec cooling velocity from the temp. range of solidus line or higher. CONSTITUTION:Temp. detecting sensor 3 and nozzle holes 4 for injecting coolant on the inner wall face 2 at the lower part of mold 1, and introducing holes 6 for sucking the coolant in the upper part of inner wall face 2 at the lower part of mold, are arranged. When the molten steel 7 is cast into the mold 1, the extremely thin solidified shell 9 formed by heat-conducting action of the upper part of inner wall face 5, is immediately descended to the position of lower part of inner wall face 2. And, by the coolant injecting from the nozzle holes 4 for injecting the coolant and circulating to the introducing holes 6 for sucking, the surface layer part is cooled at >=10 deg.C/sec cooling velocity from the temp. range of solidus line or higher. Adjustment of the cooling velocity is executed under confirming by the temp. detecting sensors 3 and the high cooling velocity at the high temp. range can be stably secured.