Method and Device for Guiding and Orienting a Strand in a Continuous Casting Facility for Large-Sized Round Profiles

Abstract

The invention relates to a method and a device for guiding and orienting a strand ( 5 ) in a continuous casting facility for large-sized round sections made of steel or a similar material. In order to prevent the formation of cracks while the strand is oriented, the outer surface ( 15 ) of the strand is heated from above and from below inside the orienting track. For this purpose, porous burners ( 10, 17 ) are arranged in the discharge section of the directing track, the hot gas emitted from said burners flowing entirely around the outer surface ( 15 ) of the strand.

1 . A method for guiding and orienting the strand in a continuous casting facility for large-sized round profiles made of steel or a similar material, characterised in that the strand surface ( 15 ) is heated within the orienting track. 
     
     
         2 . The method according to  claim 1 , characterised in that the whole of the strand surface ( 15 ) is heated. 
     
     
         3 . The method according to  claim 1 , characterised in that the heating power is adapted to the expansions occurring locally in the strand surface ( 15 ) along the orienting track. 
     
     
         4 . The method according to  claim 1 , characterised in that the strand surface ( 15 ) is heated in a number of preferably evenly arranged partial zones ( 8   b,    8   d,    8   f ) of the orienting track. 
     
     
         5 . The method according to  claims 1 , characterised in that the strand surface ( 15 ) is heated by burning an air/gas mixture in a porous structure ( 14 ) and blowing the hot exhaust gasses onto the strand surface ( 15 ). 
     
     
         6 . A device for implementing the method according to  claims 1 , characterised in that it has at least one porous burner ( 10 ,  17 ) with a reactor ( 13 ) filled with ceramic foam or similar structures, the hot exhaust gasses of which act upon the strand surface ( 15 ), at least on its upper side. 
     
     
         7 . The device according to  claim 6 , characterised in that the outlet opening of the reactor cell ( 13 ) is oriented to the upper side of the strand surface ( 15 ) so that greater heating takes place on the upper side of the strand surface than on the lower side of the latter. 
     
     
         8 . The device according to  claim 6 , characterised in that it has an orienting driver device ( 7 ) located in the outlet side strand guide region comprising a number of porous burners ( 10 ) preferably arranged evenly distributed and which are fitted in spaces between the pairs of straightening rolls ( 7   a  to  7   h ) of the orienting driver device ( 7 ). 
     
     
         9 . The device according to  claim 8 , characterised in that they are provided with at least one porous burner ( 17 ) additionally disposed in front of the orienting driver device ( 7 ). 
     
     
         10 . The device according to  claim 6 , characterised in that a tunnel element ( 8   b,    8   d  and  8   f ) at least partially surrounding the strand surface ( 15 ) is assigned respectively to the at least one porous burner ( 10 ,  17 ) through which these exhaust gasses are directed around the strand surface. 
     
     
         11 . The device according to  claim 6 , characterised in that the casting strand ( 5 ) passing out of the die ( 2 ) is guided through preferably a number of elongate tunnel elements ( 6   a  to  6   d ) in the upper section of the guide track in which tunnel elements the casting strand ( 5 ) is, as the case may be, insulated or heated.