Patent ID: 6389666
Filing Date: 2002-05-21
Classification: B21B,Y10T

Abstract:
A method of descaling surfaces having oscillation marks of cast billets produced by a continuous casting process and reduced in a hot strip train including an equalizing furnace and a plurality of rolling mill stands, with the cast billets being delivered from a continuous casting machine through a billet guide, the method comprising the steps of:subjecting surfaces of a cast billet, in a limited region between an end of the billet guide and an entrance of one of the equalizing furnace and a first rolling mill stand, by at least a double deflection of the cast billet from a horizontal transporting path of the cast billet, to stretching in a region of each deflection; and subjecting the surfaces of the cast billet to an intensive flushing with hard water jets in the deflection regions of the case billet, wherein an amount of each deflection of the cast billet is determined in accordance with a maximum allowable deformation of the cast billet and a maximum allowable surface tension of the cast billet, wherein an amount of each deflection is determined in accordance with a temperature of the cast billet under a condition of a permanent temperature control, wherein the method further includes the step of constantly measuring a variable deflection force in accordance with a structural condition of the cast billet corresponding to cooling which takes place together with descaling, and thereafter, constantly adjusting the water amount with maintaining a product of the water amount and water pressure substantially constant.