Installation for producing a hot-rolled strip

Abstract

The invention relates to a plant for producing a hot strip from a metal melt in accordance with the twin-roll casting process. To increase the melt throughput in the tundish to above the capacity limit of a one-stranded casting plant operating according to the twin-roll casting process and at the same time to reduce the batch casting times significantly with minimal investment and operating costs, the invention proposes a plant configuration in which a casting ladle ( 1 ) with a melt outlet ( 5 ) is assigned a tundish ( 6 ) for receiving the metal melt from the casting ladle ( 1 ), in that this single tundish ( 6 ) is equipped with at least two bottom outlets ( 8 a, 8 b ) for transferring the metal melt to two twin-roll casting devices ( 10 a, 10 b ), in that each casting nip ( 13 a, 13 b ) is assigned at least one of the bottom outlets ( 8 a, 8 b ) of the tundish ( 6 ), and the two casting nips ( 13 a, 13 b ) are arranged at an angle of 15° to 180°, or parallel and offset with respect to one another in terms of their longitudinal extents.

1 . A plant for producing hot strip from a metal melt in accordance with the twin-roll casting process using two twin-roll casting devices, each of the twin-roll casting devices ( 10   a ,  10   b ) being formed by two casting rolls ( 11   a ,  12   a ;  11   b ,  12   b ) which in each case form a casting nip ( 13   a ,  13   b ), characterized in that a casting ladle ( 1 ) with a melt outlet ( 5 ) is assigned a tundish ( 6 ) for receiving the metal melt from the casting ladle ( 1 ), in that this single tundish ( 6 ) is equipped with at least two bottom outlets ( 8 ) for transferring the metal melt to two twin-roll casting devices ( 10 ), in that each casting nip ( 13 ) is assigned at least one of the bottom outlets ( 8   a ,  8   b ) of the tundish ( 6 ), and the two casting nips ( 13   a ,  13   b ) are arranged at an angle α of 15° to 180°, preferably of 45° to 120°, in particular of 60° to 120°, with respect to one another in terms of their longitudinal extents.  
     
     
         2 . The plant as claimed in  claim 1 , characterized in that the two casting nips ( 13   a ,  13   b ) are arranged at an angle α of approximately 90° with respect to one another in terms of their longitudinal extents.  
     
     
         3 . The plant as claimed in  claim 1  or  2 , characterized in that the production lines ( 23 ,  24 ) which are supplied with metal melt from a common tundish ( 6 ) are arranged at a angle β of from 15° to 180°, preferably from 45° to 120°, in particular from 60° to 120°, with respect to one another.  
     
     
         4 . The plant as claimed in  claim 3 , characterized in that the production lines ( 23 ,  24 ) which are supplied with metal melt from a common tundish ( 6 ) are arranged at an angle of approximately 90° with respect to one another.  
     
     
         5 . The plant as claimed in  claim 3  or  4 , characterized in that the angle α which defines the position of the casting nips ( 13   a ,  13   b ) with respect to one another is equal to the angle β which defines the position of the production lines ( 23 ,  24 ) with respect to one another.  
     
     
         6 . The plant as claimed in one of the preceding claims, characterized in that common service areas for at least one, preferably at least two, of the following applications are arranged in the angle region between two adjacent twin-roll casting devices ( 10   a ,  10   b ) and the strip treatment devices (production lines) arranged downstream of them: 
 cast-rolling shops,    casting roll changeover station,    roll change station,    roll grinding mills,    plant operating stand,    product logistics.    
     
     
         7 . A plant for producing hot strip from a metal melt in accordance with the twin-roll casting process using two twin-roll casting devices, each of the twin-roll casting devices ( 10   a ,  10   b ) being formed by two casting rolls ( 11   a ,  12   a ;  11   b ,  12   b ) which in each case form a casting nip ( 13   a ,  13   b ), characterized in that a casting ladle ( 1 ) with a melt outlet ( 5 ) is assigned a tundish ( 6 ) for receiving the metal melt from the casting ladle ( 1 ), in that this single tundish ( 6 ) is equipped with at least two bottom outlets ( 8   a ,  8   b ) for transferring the metal melt to two twin-roll casting devices ( 10   a ,  10   b ), in that each casting nip ( 13   a ,  13   b ) is assigned at least one of the bottom outlets ( 8   a ,  8   b ) of the tundish ( 6 ) and the two casting nips ( 13   a ,  13   b ) are arranged parallel and offset with respect to one another in terms of their longitudinal extents.  
     
     
         8 . The plant as claimed in  claim 7 , characterized in that the production lines ( 23 ,  24 ) which are supplied with metal melt from a common tundish ( 6 ) are arranged so as to lead away from one another.  
     
     
         9 . The plant as claimed in one of the preceding  claims 1  to  8 , characterized in that at least one rolling stand ( 18   a ,  18   b ) is arranged downstream of each twin-roll casting device ( 10   a ,  10   b ).  
     
     
         10 . The plant as claimed in one of the preceding  claims 1  to  9 , characterized in that the casting ladle ( 1 ) is supported in a bearing device, in that this bearing device is formed by a ladle turntable ( 4 ) which can rotate about a vertical axis and has at least two receptacles ( 2 ) for casting ladles ( 1 ), and the melt outlet ( 5 ) from the casting ladle ( 1 ), in the casting position, is arranged approximately centrally above the tundish ( 6 ), preferably centrally in the region of a projecting limb ( 25 ) of a T-shaped tundish ( 6 ).  
     
     
         11 . The plant as claimed in one of the preceding  claims 1  to  10 , characterized in that the bottom outlets ( 8   a ,  8   b ) in the tundish ( 6 ) comprise submerged casting nozzles ( 6 ) which project centrally into a free melt-receiving space ( 14 ) between two interacting casting rolls ( 11   a ,  12   a ,  11   b ,  12   b ) of the twin-roll casting devices ( 10   a ,  10   b ).  
     
     
         12 . The plant as claimed in one of the preceding  claims 1  to  11 , characterized in that the bottom outlets ( 8   a ,  8   b ) in the tundish ( 6 ) are no more than 8.5 m apart.