| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary cooling method for making the prevention of occurrence of cracks accompanying a sizing compatible with the reduction of cost upon reheating before a sizing stage in a stage of performing the sizing of a slab after continuous casting. SOLUTION: Regarding the secondary cooling method within a continuous casting machine where, in a meanwhile in which, using the half thickness D of a casting thickness and the thickness d of a solidified shell, d/D<0.5 is satisfied, forced cooling is performed in a region not reaching to the corner part of the slab with the center part in the casting width direction of the slab as the center, also, at the time of the finishing of the forced cooling, the position of 10 mm from the surface layer of the slab is cooled to a transformation finishing temperature at which a γ phase is transformed into an α phase, and also, in the straightening zone of the continuous casting machine, the temperature of the surface of the slab within 200 mm from the corner part of the slab is held to ≥850°C. COPYRIGHT: (C)2011,JPO&INPIT |
