GAS SEALING METHOD FOR MOLTEN STEEL FLOW

摘要

PURPOSE:To prevent surely the intrusion of air to the molten steel flow discharged from a lower nozzle by sealing the space between a sliding nozzle and a pouring pipe by a hollow annular body and the inert gaseous flow from the gas ejection holes provided to the hollow annular body. CONSTITUTION:The hollow annular body 10 and a guide 16, gas feed pipe 15, etc. integral therewith are moved back and forth in an arrow X direction in synchronization with a lower nozzle 5 via a shielding plate 12 fitted to the nozzle 5 when the nozzle 5 is driven back and forth in the arrow X direction by a hydraulic driving mechanism. The upper part of a pouring pipe 22 is gas- sealed by the inert gas ejected from a sealing ring 23 toward the molten steel flow 29 when the inert gas is supplied to the gas feed pipes 15 and 24 while the nozzle 5 is held open. The plate 12 prevents the intrusion of the air into the shielding ring from above. The intrusion of the air into the shielding ring is prevented by the gas sealing by the inert gas from the gas ejection holes 14 of the annular pipe 11. The molten steel flow 29 is thus held in an inert gaseous atmosphere and the intrusion of the air to the molten steel flow 29 is surely prevented.