Patent ID: 6511557
Filing Date: 2003-01-28
Classification: B21B

Abstract:
A process for the manufacture of cold rolled and finished strip in gauges 0.5-0.1 mm and a maximum width of 2000 mm for the direct preparation of end products, comprising the following steps:casting thin slabs leaving a mold to a thickness of 90-50 mm; reducing the slab thickness to a minimum of 30 mm during a solidification phase; further reducing the slab thickness to a minimum of 6mm with a central symmetrical crown of 1.0-1.5% directly after the solidification phase while connected to a casting process during a roughing stage; regulating and controlling a temperature of the further reduced slab directly after the roughing stage; producing a cast-rolled product controlled as to temperature, thickness, width, crown and flatness; finishing rolling in order to obtain a recrystallized hot coil with a thickness of 1.2-0.6 mm and a crown of 1.0-1.5%; pickling the coil with subsequent cold rolling for production of a cold strip of a thickness between 0.5 and 0.1 mm; cold finishing by a skinpass step preceded by temperature management for control of structure of the strip; further comprising in-line pressing of finished, ready to be used pieces with return of processing scrap to a steel manufacturing cycle; wherein an intermediate strip is hot rolled directly in a finishing mill without intermediate winding through a coil-box and a hot strip is sent directly without intermediate winding in a down-coiler; and further comprising coating the cold rolled strip between the cold finishing and pressing steps.