METHOD AND DEVICE FOR CONTINUOUS CASTING

PURPOSE:To obtain a billet free from segregation, surface crack, etc. in horizontal and continuous casting by cooling the base of a mold to grow a solidified shell in an early period and accelerating the upward solidification in one direction while drawing the solidified shell in the horizontal direction. CONSTITUTION:A molten steel is cooled from the base of a mold 6 curved to increase the thickness of a cast billet in the drawing direction to form a solidified shell and to grow the shell in an early period. The mold 6 has an inside mold plate 19 manufactured of a material having good heat conductivity such as a copper plate or the like for the above-mentioned purpose. Said inside plate 19 is cooled by the cooling water for the mold and is so formed as to have the acute angle between the surface of the molten steel and the base of the plate 19. The base and side face of the solidified shell are subjected to heat extraction by a force cooler 9 and while the solidified shell is grown in the direction of the top surface, the solidification is completed at the point P. The rate of pouring and the drawing speed by pinch rolls 11 are controlled by a control device 17 with the measured value of a device 16 for measuring the thickness of the billet 5 as a reference.