Patent ID: 9643241
Date: 2017-05-09
CPC Classifications: B22D

Claim:
1. A continuous casting method for casting a solid metal by pouring a molten metal in a ladle into a tundish disposed therebelow and continuously pouring the molten metal in the tundish into a casting mold, the continuous casting method comprising: a long nozzle installation step for providing in the ladle a long nozzle extending into the tundish as a pouring nozzle for pouring into the tundish the molten metal in the ladle; a pouring step for pouring the molten metal into the tundish through the long nozzle and immersing a spout of the long nozzle into the molten metal in the tundish; a first seal gas supply step for supplying an inert gas as a seal gas around the molten metal in the tundish in the pouring step; a casting step for pouring the molten metal into the tundish through the long nozzle, while immersing the spout of the long nozzle into the molten metal in the tundish, and pouring into the casting mold the molten metal in the tundish; a second seal gas supply step for supplying a nitrogen gas, instead of the inert gas, as a seal gas around the molten metal in the tundish in the casting step; and a spraying step for spraying a tundish powder so as to cover a surface of the molten metal in the tundish between the pouring step and the casting step and prior to the second seal gas supply step.