ROLLING MILL FOR PRODUCING STEEL FOR TUBES AND THIN STRIP
The invention relates to a rolling mill for producing metal strips, preferably steel for tubes and/or thin strip, in which the temperature control can be influenced between the finish stands Fi and Fi+1 using a rapid heating device (induction heater), characterized in that the distance between the stands Fi and Fi+1, between which a rapid heating device is arranged, is 5 to 25 m, and in addition to an induction heater, a roller flattening unit (for example, roller leveler 14 ), and/or shears 8 , and/or a driving roller pair 12 , and/or a descaling sprayer 15 are arranged as additional units between the two stands. The roll stand Fi and/or regions in front of the roll stand Fi further comprise actuators for influencing the strip warping and/or strip ski-up/-down at the strip head.
1 . Rolling mill for producing metal strips, preferably steel for tubes and/or thin strip in which a rapid heating device ( 8 ) is arranged between two, following one another, finishing stands (Fi, Fi+1), characterized in that
distance between the stands (Fi, Fi+1) between which the rapid heating device ( 8 ) is arranged amounts to 5-25 m, and that in addition to the rapid heating device, at least one further auxiliary unit, in particular a straightening unit, preferably a roller straightening device ( 14 ) ( 62 ) is arranged.
2 . Rolling mill according to claim 1 , characterized in that the rolling stand (Fi) which is arranged before the rapid heating device ( 8 ), or/and regions before and after the rolling stand ( 1 ) are equipped with actuators for influencing strip curvature and/or strip-ski phenomenon on the strip head.
3 . Rolling mill according to claim 1 , characterized in that the rolling stands (Fi, Fi+1) are finishing stands of preferably compact continuous train.
4 . Rolling mill according to claim 1 , characterized in that it advantageously forms a rolling mill of CPS-installation for producing thin slabs with a thickness of ≦120 mm.
5 . Rolling mill according to claim 1 , characterized in that the heating device, in particular, an induction heating device, advantageously, with from 1 to 4 induction elements, is arranged between the first and second stands (F 1 , F 2 ) or/and between second and third stands (F 2 , F 3 ), or is insertable therebetween.
6 . Rolling mill according to claim 1 , characterized in that at least one driving roller pair is arranged between the stand (Fi) and the following stand (Fi+1) or is insertable therebetween.
7 . Rolling mill according to claim 1 , characterized in that a device for correction or prevention of ski-phenomenon in the intermediate strip is arranged between the stand (Fi) and the following stand (Fi+1), preferably, before the heating device, or is insertable therebetween.
8 . Rolling mill according to claim 7 , characterized in that the device for correction or prevention of the ski-phenomenon is a hold-down roller, a hold-down plate, a hold-down strut, a bending and straightening machine, a strip held-straightening channel or a strip head-pressing device.
9 . Rolling mill according to claim 1 , characterized in that at least one rolling stand (Fi) has separate drives for the upper and lower working rolls (Fia, Fib).
10 . Rolling mill according to claim 1 , characterized in that strip cooling or strip heating means is located before a rolling stand (Fi) with which temperature distribution over the slab or the strip thickness is adjusted for influencing the ski-phenomenon and strip curvature.
11 . Rolling mill according to claim 1 , characterized in that the rolling stand (Fi) has, at a run-in side thereof, table height-adjusting means with which the strip running position is adjusted.
12 . Rolling mill according to claim 1 , characterized in that shears are arranged between at least two rolling stands (Fi, Fi+1) or are insertable therebetween.
13 . Rolling mill according to claim 1 , characterized in that a descaling sprayer is arranged between at least two rolling stands (Fi Fi+1) or is insertable therebetween.
14 . Rolling mill according to claim 1 , characterized in that a distance between two, following one another stands (Fi, Fi+1) is smaller than the intermediate strip length rolled between the stands.
15 . Rolling mill according to claim 1 , characterized in that a heat insulation hood is arranged between at least two rolling stands (Fi, Fi+1), in particular, as a replacement for previously removed units, or is insertable therebetween.
16 . Rolling mill according to claim 1 , characterized in that the rolling mill is connected with a process model which controls and regulates different measures and adjustments for influencing the ski-phenomenon.
17 . Rolling mill according to claim 1 , characterized in that the rapid heating device is formed compact and a power density, which is inducted in the strip, amounts to at least 1,500 megawatt per square meter, preferably, to about 4,000 megawatt (+/−18%) per square meter.