Casting-rolling installation, and method for producing a steel strip

Abstract

A casting-rolling installation and a corresponding method serve for producing a steel strip that runs through the casting-rolling installation in a conveying direction. The casting-rolling installation includes a two-roller casting device with two casting rollers that are each arranged mounted rotatably about axes aligned axially parallel to one another and at the same height. A cast steel strip is produced by the two-roller casting device. A rolling mill stand for rolling the cast steel strip is mounted downstream of the casting device in the direction of conveyance of the steel strip. The rolling mill stand is arranged relative to the casting device in such a manner that a roll nip inlet of the rolling mill—as seen in the vertical direction—is located with respect to the position of the axes of the casting rollers at the same height or above same.

1 .- 14 . (canceled) 
     
     
         15 . A casting-rolling installation ( 10 ), comprising
 a two-roller casting device ( 12 ) having two casting rollers ( 13 ) that are mounted rotatably about axes (X 1 , X 2 ) which are aligned parallel to one another and arranged at a same height, the two-roller casting device ( 12 ) being configured to produce a cast steel strip ( 1 ); and   a rolling mill stand ( 14 ) for rolling the cast steel strip ( 1 ) mounted downstream of the two-roller casting device ( 12 ) in a conveying direction (F), the rolling mill stand ( 14 ) being arranged relative to the two-roller casting device ( 12 ) such that a roll nip inlet ( 15 ) of the rolling mill stand ( 14 ) is located vertically at or above the same height of the axes (X 1 , X 2 ) of the casting rollers ( 13 ).   
     
     
         16 . The casting-rolling installation ( 10 ) according to  claim 15 ,
 further comprising a turning roller ( 16 ) arranged between the two-roller casting device ( 12 ) and the rolling mill stand ( 14 ), the turning roller ( 16 ) being configured deflect the cast steel strip ( 1 ) towards the rolling mill stand ( 14 ).   
     
     
         17 . The casting-rolling installation ( 10 ) according to  claim 15 ,
 wherein the casting rollers ( 13 ) are designed such that a width of the cast steel strip ( 1 ) is ≤2,200 mm.   
     
     
         18 . The casting-rolling installation ( 10 ) according to  claim 15 ,
 wherein a diameter of the casting rollers ( 13 ) is ≤1,500 mm.   
     
     
         19 . The casting-rolling installation ( 10 ) according to  claim 15 ,
 further comprising a loop detection device ( 18 ) for determining a position of a loop ( 19 ) formed by the cast steel strip ( 1 ), the loop ( 19 ) being located between the two-roller casting device ( 12 ) and the rolling mill stand ( 14 ).   
     
     
         20 . The casting-rolling installation ( 10 ) according to  claim 19 , wherein the loop detection device ( 18 ) comprises a non-contact distance sensor ( 20 ). 
     
     
         21 . The casting-rolling installation ( 10 ) according to  claim 20 , wherein the non-contact distance sensor ( 20 ) includes a laser and/or a video camera. 
     
     
         22 . The casting-rolling installation ( 10 ) according to  claim 19 ,
 further comprising a control unit (R) that is operatively connected to the loop detection device ( 18 ),   wherein the control unit (R) is configured to control a rotational speed of the casting rollers ( 13 ) and/or a rolling speed of the rolling mill stand ( 14 ) such that the loop ( 19 ) assumes a predetermined contour.   
     
     
         23 . The casting-rolling installation ( 10 ) according to  claim 15 ,
 further comprising at least one induction furnace ( 22 ) arranged above the two-roller casting device ( 12 ) for feeding liquid steel melt into a casting nip (G) formed between the casting rollers ( 13 ).   
     
     
         24 . A method for producing a steel strip, comprising:
 casting the steel strip ( 1 ) by a two-roller casting device ( 12 ) having two casting rollers ( 13 );   subsequently moving the steel strip ( 1 ) in a conveying direction (F) to a rolling mill stand ( 14 ) mounted downstream for rolling the steel strip ( 1 );   controlling a rotational speed of the casting rollers ( 13 ) and/or a rolling speed of the rolling mill stand ( 14 ) such that a loop ( 19 ) formed by the steel strip ( 1 ) between the casting device ( 12 ) and the rolling mill stand ( 14 ) assumes a predetermined contour; and   controlling the rotational speed of the casting rollers ( 13 ) so that the steel strip ( 1 ) assumed a casting speed between 20 m/min and 100 m/min.   
     
     
         25 . The method according to  claim 24 , further comprising detecting an actual contour of the loop ( 19 ) by a loop detection device ( 18 ). 
     
     
         26 . The method according to  claim 25 ,
 wherein controlling the rotational speed of the casting rollers ( 13 ) and/or the rolling speed of the rolling mill stand ( 14 ) is performed by a control unit (R) that is operatively connected to the loop detection device ( 18 ) as a function of the actual contour of the loop ( 19 ) and the predetermined contour.