Patent ID: 8057604
Filing Date: 2011-11-15
Classification: B08B,B21B,C23C

Abstract:
1. A method for descaling a metal strip ( 1 ), in which the metal strip ( 1 ) is guided in a direction of conveyance (R) through at least two plasma descaling units ( 2 , 3 ), in which it is subjected to a plasma descaling, where, following the plasma descaling of the metal strip ( 1 ) in a first of the plasma descaling units ( 2 , 3 ), the metal strip ( 1 ) is subjected to an automatically controlled cooling in a first cooling unit ( 4 , 5 ) in such a way that it has a well-defined temperature after passing through the first cooling unit ( 4 , 5 ), wherein the metal strip ( 1 ) is cooled in the first cooling unit ( 4 , 5 ) by bringing it into contact with a cooling roller ( 6 , 7 , 8 , 9 , 10 , 11 ) over a predetermined angle of wrap (a), and varying the angle of wrap to control cooling of the metal strip after leaving the first cooling unit the metal strip is subjected to plasma descaling in a last descaling unit, after leaving the last descaling unit the metal strip is cooled in a last cooling unit using a protective gas.