Chilled continuous casting mould for casting metal

Abstract

A cooled continuous casting mold for casting metal, in particular steel, in slab format and having, in particular, a thickness between 40 and 400 mm and a width from 200 mm to 3,500 mm, with mold walls formed of plates in which cooling medium channels for cooling are formed, is so improved that the thermal loading over the mold profile is uniform and, therefore, the hot face temperature of the liquid metal level may be reduced, and to this end, a width ( 26.1 ) of the cooling medium channels ( 29 ) is reduced, in a casting direction dependent on a thermal flow profile ( 2.1 ), over a mold height ( 13 ) from a mold inlet ( 13.1 ) to a mold outlet ( 13.2 ).

1 . A cooled continuous casting mold for casting metal, in particular steel, in slab format and having, in particular, a thickness between 40 and 400 mm and a width from 200 mm to 3,500 mm, with mold walls formed of plates ( 7 ,  7 . 1 ) and with cooling medium channels for cooling, characterized in that a width ( 29 . 1 ) of the cooling medium channels ( 29 ) is reduced, in a casting direction dependent on a thermal flow profile ( 2 . 1 ), over a mold height ( 13 ) from a mold inlet ( 13 . 1 ) to a mold outlet ( 13 . 2 ).  
     
     
         2 . A cooled continuous casting mold according to  claim 1 , characterized in that the width ( 26 . 1  of the cooling medium channels diminishes, in a casting direction approximately functionally according to the thermal flow profile over the mold height ( 13 ) between the mold inlet ( 13 . 1 ) and the mold outlet ( 13 . 2 ).  
     
     
         3 . A cooled continuous casting mold according to  claim 1 , characterized in that the width ( 26 . 1 ) of the cooling medium channels diminishes, in the casting direction, approximately linearly, wherein the boundary lines or surfaces of a cooling medium channel or adjacent cooling medium channels extend not parallel to each other but at an acute angle ( 29 . 2 ) toward each other.  
     
     
         4 . A cooled continuous casting mold according to  claim 1 ,  2 , or  3 , characterized in that depth ( 26 . 2 ) of the cooling medium channels increases, in the casting direction, over the mold height ( 13 ) from the mold inlet ( 13 . 1 ) toward the mold outlet ( 13 . 2 ).  
     
     
         5 . A cooled continuous casting mold according to  claim 4 , characterized in that dependent on a reduction of the width, an increase of the depth ( 26 . 2 ) over the mold height ( 13 ) so changes that a size of a respective cross-sectional surface ( 26 . 3 ) of a cooling channel remains constant from the mold inlet ( 13 . 1 ) to the mold outlet ( 13 . 2 ), so that the flow velocity of a cooling medium, in the cooling medium channels, remains constant from the mold inlet ( 13 . 1 ) to the mold outlet ( 13 . 2 ).  
     
     
         6 . A cooled continuous casting mold according to any of claims  1  through  5 , characterized in that water boxes adjoin the plates ( 7 ,  7 . 1 ) of the mold walls, in particular, copper plates for supplying the cooling channels, wherein water box outlet ( 38 . 1 ) is arranged at a height of the mold inlet ( 13 . 1 ) and a water box inlet ( 38 . 2 ) is arranged at height of the mold outlet ( 13 . 2 ).  
     
     
         7 . A cooled continuous casting mold according to any of claims  1  through  6 , characterized in that a percentage cooling medium overlay, in particular, water overlay, which is defined by a ratio of a difference between a maximally cooled mold width and a non-directly cooled mold width to the cooled mold width, at mold inlet ( 13 . 1 ), in particular at a height of liquid metal level ( 30 ), amounts maximum to 100%, in particular 100%, and at the mold outlet ( 13 . 2 ) minimum to 30%, in particular, minimum 30%.  
     
     
         8 . A cooled continuous casting mold according to any of claims  1  through  7 , characterized in that cooling medium, cooling water flows over a channel length with a flow velocity between 25 and 2 m/s.  
     
     
         9 . A cooled continuous casting mold according to any of claims  1  through  8 , characterized in that a thickness of a copper plate ( 7 ,  7 . 1 ), between melt and the cooling water course, is no smaller than 5 mm.  
     
     
         10 . A cooled continuous casting mold according to any of claims  1  through  9 , characterized in that a mold cooling water pressure ( 11 ) at a water box outlet ( 38 . 1 ) amounts to between 2 and 25 bar.  
     
     
         11 . A cooled continuous casting mold according to any of claims  1  through  10 , characterized in that a strand casting velocity Vb ( 14 ) amounts to between 1 and 15 m/min.  
     
     
         12 . A cooled continuous casting mold according to any of claims  1  through  11 , characterized in that it operates by feeding steel melt through an immersion nozzle (SEN) ( 35 ) and by feeding a cast compound, and in that the mold is an oscillating mold.  
     
     
         13 . A cooled continuous casting mold according to any of claims  1  through  12 , characterized in that the cooling channels are formed as cooling slots ( 29 ) provided in the plate ( 7 ,  7 . 1 ) before formation of a remote side of the plate ( 7 ,  7 . 1 ), and that the cooling slots ( 29 ) are closed, for obtaining predetermined cross-sectional surfaces over the mold height ( 13 ), with correspondingly formed water guiding plates a width of which over the mold height ( 13 ) is adapted, from the cooling water inlet ( 13 . 1 ) to the cooling water outlet ( 13 . 2 ), to the width change of the cooling channel course.  
     
     
         14 . A cooled continuous casting mold according to any of claims  1  through  12 , characterized in that the cooling channels are formed as cooling bores into which displacement bars are inserted.