Tundish for continuous casting

Abstract

The present invention provides a tundish for continuous casting, the tundish having an inner volume including an inlet portion including an inlet for receiving molten metal, an outlet portion including at least one outlet for discharging molten metal, and a flow separator. The tundish further includes an EMS stirrer for electromagnetic stirring, wherein, the flow separator is positioned between the inlet portion and the outlet portion, the EMS stirrer is disposed outside of the tundish, at a vertical position below the top of the inner volume of the tundish and above the bottom of the inner volume of the tundish, the EMS stirrer is disposed to make the molten metal in the outlet portion flow in a horizontal direction, and the flow which is directly induced by the EMS stirrer flows away from the inlet.

1 . A tundish for continuous casting, the tundish comprising an inner volume having an inlet portion for receiving molten metal, having an outlet portion having at least one outlet for discharging molten metal, and a flow separator,
 the tundish further including an EMS stirrer for electromagnetic stirring, wherein,   the flow separator is positioned between the inlet portion and the outlet portion,   the EMS stirrer is disposed outside of the tundish, at a vertical position below the top of the inner volume of the tundish and above the bottom of the inner volume of the tundish,   the EMS stirrer is disposed to make the molten metal in the outlet portion flow in a horizontal direction, and the flow which is directly induced by the EMS stirrer flows away from the inlet.   
     
     
         2 . The tundish according to  claim 1 , wherein the stirring causes no more than two vortices of molten metal in the tundish. 
     
     
         3 . The tundish according to  claim ,1 , wherein the EMS stirrer is disposed to stir the entire volume of the molten metal in the outlet portion. 
     
     
         4 . The tundish according to  claim 1 , wherein the tundish has an operator side, and a back side which is opposite to the operator side, and
 the stirrer is mounted on the back side of the tundish, or on the operator side of the tundish.   
     
     
         5 . The tundish according to  claim 1 , wherein the stirring direction of each stirrer is adjustable. 
     
     
         6 . The tundish according to  claim 1 , wherein the stirring strength of each stirrer is adjustable. 
     
     
         7 . The tundish according to  claim 1 , wherein the flow separator is at least one of a baffle, a weir, and a dam. 
     
     
         8 . The tundish according to  claim 1 , wherein the flow separator is configured to restrict the stirring of the molten metal by the EMS stirrer in the inlet portion. 
     
     
         9 . The tundish according  claim 1 , wherein a maximum surface speed of the molten metal in the outlet portion is no more than 0.50 m/sec, and/or the volume average speed of molten metal in the outlet portion is no less than 0.05 m/sec, and/or the specific stirring energy is no less than 8.0 w/ton. 
     
     
         10 . A method of stirring a molten metal in a tundish having
 a tundish body provided with an inlet portion having an inlet for molten metal, an outlet portion having at least one outlet, a flow separator, and an EMS stirrer for electromagnetic stirring, wherein,   the flow separator is positioned between the inlet portion and the outlet portion   the EMS stirrer is disposed horizontally, outside of the tundish,   the method comprising stirring the molten metal in the outlet portion to flow in a horizontal direction, and so that the flow which is directly induced by the EMS stirrer flows away from the inlet.   
     
     
         11 . The method of stirring a molten metal in a tundish according to  claim 10 , wherein the stirring causes no more than two vortices of molted metal in the tundish. 
     
     
         12 . The method of stirring a molten metal in a tundish according to  claim 10 , wherein the molten metal is stirred in an essentially horizontal direction, with essentially no vertical component. 
     
     
         13 . The method of stirring a molten metal in a tundish according to  claim 10 , wherein the strength and direction of stirring by the EMS stirrer stirs are adjusted so that a maximum surface speed of the molten metal in the outlet portion is no more than 0.50 m/sec, and/or the volume average speed of molten metal in the outlet portion is no less than 0.05 m/sec, and/or the specific stirring energy is no less than 8.0 w/ton. 
     
     
         14 . A Use of an EMS stirrer for electromagnetic stirring of a molten metal in a tundish for continuous casting, the tundish having an inner volume comprising: an inlet portion having an inlet for receiving molten metal, an outlet portion including at least one outlet for discharging molten metal, and a flow separator,
 the flow separator being positioned between the inlet portion and the outlet portion, wherein   the EMS stirrer is disposed outside of the tundish, at a vertical position below the top of the inner volume of the tundish and above the bottom of the inner volume of the tundish,   the EMS stirrer is disposed to make the molten metal in the outlet portion flow in a horizontal direction, and   the flow which is directly induced by the EMS stirrer flows away from the inlet.   
     
     
         15 . The tundish according to any  claim 2 , wherein the EMS stirrer is disposed to stir the entire volume of the molten metal in the outlet portion. 
     
     
         16 . The tundish according to  claim 2 , wherein the tundish has an operator side, and a back side which is opposite to the operator side, and
 the stirrer is mounted on the back side of the tundish, or on the operator side of the tundish.   
     
     
         17 . The tundish according to  claim 2 , wherein the stirring direction of each stirrer is adjustable. 
     
     
         18 . The tundish according to  claim 2 , wherein the stirring strength of each stirrer is adjustable. 
     
     
         19 . The tundish according to  claim 2 , wherein the flow separator is at least one of a baffle, a weir, and a dam. 
     
     
         20 . The tundish according to  claim 2 , wherein the flow separator is configured to restrict the stirring of the molten metal by the EMS stirrer in the inlet portion.