CASTING METHOD OF STEEL INGOT

摘要

PURPOSE:To reduce the thickness of the segregation zone to be formed in the head part of a steel ingot and to improve the yield of the rolled produced by determining the area ratio between the inverted V segregation region formed on the casting wall side and the region inner than the inverted V segregation region and casting the ingot under the conditions expressed by the specific equations. CONSTITUTION:The area ratio B between the inverted V segregation region 2 formed on the casting wall side and the region 3 inner than said region 2 is determined by the equation I (x: the width of the steel ingot, y: the length of the steel ingot, a: the max. width of the region 2) in casting of the steel ingot wherein the molten steel charged into a casting mold is solidifed in one direction directing from the bottom to the head part of the steel ingot in the axial central direction thereof. The molten steel is then cast under the condition of the equation II (h: the height of the steel ingot). The thickness of the segregation zone 1 to be formed in the head part of the steel ingot is thus kept at <=200mm. and the rolled product is produced in a high yield.