Method of rolling high grade steel strip in continuous strip installations

摘要

An input strip B is reduced in stages with desired decreasing thicknesses to a final thickness under set tensile forces in at least one roll stand (1). The method comprises, for temporary stoppage of the strip, maintaining the tensile forces on the strip, opening the roll gap of each roll stand to at least the rolling stock thickness detected on the intake side of the roll stand, returning the strip portions (5,6,7) located downstream of each roll stand and already rolled to the desired thickness at least to upstream of the respective roll stand by reversal of the strip travel direction, and, after reversal again of the strip travel direction and closure of the roll gap to the respective desired thickness set prior to opening of the roll gap, repassing the strip portions following the strip portions through the roll stands following in the rolling direction. The strip portion is located downstream of the last roll stand on-the outlet side and already rolled out to the final size is returned to upstream of the first roll stand on the intake side and passes through all the roll stands again together with the other strip portions already reduced to the desired thicknesses, the roll gaps of the individual roll stands being returned to the respective desired thicknesses set prior to opening of the roll gap.