JPS555115A - Continuous casting method - Google Patents

Abstract

PURPOSE: To cast the ingot free from such defect as the inner crack, etc., at high speed, by locating the crater end of the ingot behind the correcting point, and by relatively more forcibly cooling the temperature of the outer surface as compared with the temperature of the inner surface at the correcting point, so as not to exceed 1000°C.

CONSTITUTION: In the process for correcting the ingot, being drawn and bent, into the flat condition, the crater end of the ingot is located at the horizontal zone behind the correcting point. As compared with the shell 62 on the lower surface side of the unsolidified ingot 7 nearby the correcting point, the intensity of spray against the shell 61 on the upper surface side, which is highly sensible against cracking, is more raised for the range so far as the correcting point. That is, the inner surface temperature of the ingot is forcibly cooled to 700W900°C, and the outer surface temperature of the ingot is forcibly cooled so as not to exceed 1000°C. Hereby, the bulging strain 161 is reduced, the position of the neutral axis 151 is placed on the neutral axis 151 being relatively shifted upward, the distribution 181 of the correcting strain in the shell 61 on the upper surface side is reduced, the total strain distribution 191 is stabilized so as to be less than the critical strain 171, and as a result, the ingot with excellent internal quality and the surface condition can be manufactured at high efficiency.

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