HORIZONTAL AND CONTINUOUS CASTING METHOD FOR METAL

摘要

PURPOSE:To form the finer crystal grains and to prevent the internal cracking of an ingot by cooling a molten metal supplied into a water-cooled casting mold from a tundish in such a manner that said steel forms a solidified shell in the mold without forming the solidified shell in a feed nozzle. CONSTITUTION:The feed nozzle 1 of the horizontal and continuous casting method for steel consisting in supplying the molten steel from the tundish (not shown) onto the water-cooled casting mold 6 through the feed nozzle 1, cooling and solidifying the molten metal with a lubricating sleeve 4 and drawing the solidified shell obtd. in such a manner as the ingot 5 toward the arrow direction is constituted of a refractory heat insulating brick and a slit 2 is provided to the outside surface thereof to decrease the heat transmission area. The cooling of the molten metal in the nozzle 1 is thereby prevented by which the formation of the solidified shell is prevented. The molten metal is quickly cooled on the mold 6 and a solid/liquid boundary 3 is quickly raised to form the solidified shell. As a result, the finer crystal grains are formed and the grain boundary cracking is prevented. The ingot 5 having no internal cracks is thus obtd.