Patent ID: 8087449
Filing Date: 2012-01-03
Classification: B21B,Y10T

Abstract:
1. A rolling method in a rolling line, comprising: casting steel in the form of thin slabs with a thickness comprised from 30 mm to 140 mm using the rolling line, wherein the rolling line includes: a continuous casting device; a tunnel furnace for maintenance/equalization and possible heating; a rolling train consisting of a roughing train comprising from 1 to 4 rolling strands and a finishing train comprising from 3 to 7 stands; and a rapid heating unit, with elements able to be selectively activated, interposed between said roughing train and said finishing train; wherein, for each lay-out of the rolling line, the position of the rapid heating unit which defines the number of stands which form the roughing train, disposed upstream of the unit and the number of stands which form the finishing train, disposed downstream of the unit is calculated as a function of the product of the thickness and speed of the thin slab, said product being in turn a function of the hourly productivity in tons/hour desired to be obtained, wherein the rolling line is made to work either in coil-to-coil mode, or in semi-endless mode or in endless mode, and wherein one of the three aforesaid modes of the rolling process is selected according to the quality of the steel produced, to the maximum casting speed possible for said quality of steel, to the final thickness of the strip and to the production cost, the tunnel furnace, located between the continuous casting device and the first stand of the roughing train, has a length such as to contain a quantity, expressed in weight, of thin slabs equivalent from 2 to 5 coils, and the tunnel furnace has a mobile segment to connect a second casting line, parallel to the first; and obtaining from the rolling line, strip of steel with a thickness varying from 0.7 mm to 20 mm.