| CPC B21B 13/02 (2013.01) [B21B 1/46 (2013.01); B21B 15/0085 (2013.01); B21B 37/42 (2013.01); B21B 37/44 (2013.01); B22D 11/1206 (2013.01); B22D 11/1287 (2013.01); B21B 2013/025 (2013.01); B21B 2013/028 (2013.01); B21B 2015/0057 (2013.01); B21B 45/0233 (2013.01); B21B 2201/14 (2013.01); B21B 2261/04 (2013.01); B21B 2261/20 (2013.01); B21B 2267/06 (2013.01); B21B 2269/04 (2013.01); B21B 2269/06 (2013.01); B21B 2269/10 (2013.01); B21B 2269/14 (2013.01); B21B 2269/16 (2013.01)] | 20 Claims |
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1. Six-high rolling mill stand for hot rolling an intermediate strip into a thin strip, the rolling mill stand comprising:
an upper work roll and a lower work roll for hot rolling the intermediate strip between the upper work roll and the lower work roll into the thin strip,
work roll bending blocks for bending the work rolls in vertical direction;
two axial shifting devices for axially shifting the work rolls;
two intermediate rolls for supporting the work rolls in vertical direction
intermediate roll bending blocks for bending the intermediate rolls in vertical direction; and
two backup rolls for supporting the intermediate rolls in vertical direction,
wherein each intermediate roll has a first tapered portion, in axial direction followed by an intermediate portion, and followed by a second tapered portion,
wherein a roll crown of the intermediate portion follows an even function with respect to the centre of the intermediate portion fin width direction,
wherein each tapered portion features a large diameter adjacent to the intermediate portion and a comparatively smaller diameter on outside.
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10. Finishing mill train for hot rolling an intermediate strip into a thin strip, wherein the thickness of the thin strip is <0.8 mm, the finishing mill comprising:
two or three four-high mill stands, wherein each four-high mill stand features work roll bending blocks for bending the work rolls of the mill stand in the vertical direction,
two or three six-high rolling mill stands according to claim 1, wherein the four-high mill stands are arranged in the transport direction of the strip before the six-high rolling mill stands.
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14. Method for producing a thin strip in a combined casting and rolling installation, wherein the thickness of the thin strip is <0.8 mm, comprising the following steps:
continuous casting a steel strand with slab or thin-slab format in a continuous casting machine;
liquid-core reduction and/or soft-core reduction of the steel strand in a strand guide of the continuous casting machine, wherein the thickness of the steel strand is reduced by at least 5%;
roughing rolling of the reduced steel strand to an intermediate strip in a roughing mill train, wherein the thickness of the intermediate strip is between 8 and 45 mm;
finishing rolling the intermediate strip into the thin strip in a finishing mill train, wherein firstly two or three reduction steps are performed subsequently by four-high mill stands, and secondly, two or three reduction steps are performed subsequently by six-high mill stands, wherein the finishing mill train is according to claim 10;
measuring a profile and/or a flatness of the thin strip, wherein a measurement device is arranged in the transport direction of the strip between the last mill stand of the finishing mill train and the first cooling header of a cooling line;
cooling of the thin strip to coiling temperature in the cooling line; and
coiling of the cooled thin strip.
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