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AssigneeKawasaki Steel Corporation
InventorsYukio Oguchi, Norio Sumida, Tetsuya Fujii, Toshihiko Emi, Toshio Fujimura, Arata Ueda
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A method of stirring molten metal by repeatedly sucking and rapidly discharging part of the molten metal into and out of a refractory cylinder having a lower opening end immersed in the molten metal in a ladle, comprises operating the stirring under a condition that an inner diameter (d) of the refractory cylinder is less than 1,000 mm, a relation between the inner diameter (d, mm) of the refractory cylinder and weight (W, ton) of the molten metal in the ladle is d/W.sup.0.5 >30, and an immersed depth of the refractory cylinder is within 200-700 mm. A pressurized gas for discharging the sucked molten metal out of the cylinder is introduced thereinto in an inclined direction relative to a vertical line against a point on an opposite inner wall of the cylinder at least 500 mm above the maximum suction level of the molten metal in the cylinder. A refractory cylinder operated in the above manner according to the invention comprises a flange connection between an uppermost and an intermediate cylinder parts of the cylinder at a location higher than the maximum suction height of the molten metal and a further flange connection between the intermediate cylinder part and a lowermost cylinder part. The refractory cylinder comprises at its immersed end a flow restricting opening to obtain more strong stirring the molten metal.
A method of stirring molten metal by repeated sucking and rapidly discharging part of said molten metal into and out of a refractory cylinder having a lower opening end immersed in said molten in a ladle, comprising operating the stirring under a condition wherein an inner diameter (d) of said refractory cylinder is less than 1,000 mm, a relation between the inner diameter (d, mm) of said refractory cylinder and weight (W, ton) of said molten metal in said ladle is d/W.sup.0.5 >30, and an immersed depth of said refractory cylinder is within 200-700 mm.
A refractory cylinder for stirring molten metal having a lower opening end immersed in said molten metal in a ladle and including evacuating and pressurizing means for repeatedly sucking and discharging rapidly part of said molten metal into and out of said refractory cylinder, comprising a flange connection for said refractory cylinder at a location higher than a predetermined maximum suction height of said molten metal in the cylinder.
Dependencies are inferred from the claim text.