CONTINUOUS CASTING METHOD OF PREVENTING SURFACE CRACKING OF INGOT AND CASTING MOLD

摘要

PURPOSE:To cast continuously an ingot without surface cracking on the ingot by casting a molten middle-carbon steel into a casting mold formed with plural vertical grooves each having an adequate shape and size to the surface in the upper part in the casting mold and cooling slowly only the solidified shell in the upper part of the casting mold. CONSTITUTION:The plural vertical grooves 5 each having 250-750mum width, 60-300mum depth D and 20-90% area rate are provided only on the inside surface 2 of the casting mold made of copper within 300mm from the top end of the mold 1 in parallel with the casting direction in a method for executing continuous casting by casting a molten metal cong. 0.09-0.16% C via an immer sion nozzle 3 into the casting mold 1 and floating a flux consisting of molding powder 4 on the surface of the molten steel in the casting mold. Then air stagnates in the grooves 5 to suppress the inflow of the powder 4 and the molten steel. The molten steel contacts with the mold 1 only at projecting parts 6 and the solidified shell is slowly cooled only in the upper part of the mold 1, by which the surface cracking of the ingot is prevented.