| 摘要 |
PURPOSE:To desulfurize molten steel while degassing it by blowing an inert gas for causing the reflux of the molten steel and a powdered desulfurizing agent from plural tuyeres each having a specified inside diameter or below when the molten steel is vacuum-degassed. CONSTITUTION:Two pipes 2, 3 extended downward from the bottom of a vacuum vessel 1 are immersed in molten steel 5 in a ladle 4, and an inert gas is blown into the pipe 2 to vaccum-degas the molten steel 5 while circulating it in the ladle 4 and the vessel 1. At this time, plural tuyeres 7 each having <=6mm. inside diameter are attached to the pipe 2, and a powdered desulfurizing agent suspended in the inert gas is blown from the tuyeres 7 to carry out desulfurization as well as vacuum degassing. |
