Patent ID: 7343961
Filing Date: 2008-03-18
Classification: B21B,C21D

Abstract:
1. Process for the continuous production of an ultrathin hot rolled steel strip from a thin slab obtained by continuous casting in a mould, comprising: a continuous casting step ( a pre-transformation ( an induction heating ( a final transformation ( the slab leaving the mould with a central crown at each side; a reduction of a slab thickness in continuous casting during solidification ( a secondary cooling during a liquid steel core reduction step ( specific water delivery between 0.6 and 3.0 liters per kg of cast steel, decreasing cooling density in the direction of the slab advancement due to liquid core reduction, and selective control of cooling fluid flow rates between a front side and a back side of the slab; said pre-transformation being a roughing step of the thin slab upon solidification at a surface temperature of the slab >1100° C. with not more than four passes to obtain an intermediate strip ( said induction heating ( said plastic stretching ( said final transformation ( a controlled cooling (