Patent ID: 6546771
Filing Date: 2003-04-15
Classification: B21B,C21D

Abstract:
A method for manufacturing strips of stainless steel, comprising cold rolling of a strip which in a foregoing process has been manufactured through casting a melt to form a cast strip and/or has been hot rolled, said cold rolling being performed in a rolling mill line which comprises, in an initial part of the mill line, at least two initial cold rolling mills in series, after said initial cold rolling mills at least one annealing furnace and at least one pickling section and, in a terminating part of the line, at least one further cold rolling mill, wherein the cast and/or hot rolled strip, which is dark colored by oxides on surfaces of the strip, with said dark colored oxides remaining on the surfaces of the strip, first is cold rolled in at least one of said initial cold rolling mills to reduce the thickness of the strip totally by 10-75%, then the strip is annealed and pickled in said annealing and pickling sections and is cold rolled in said at least one further cold rolling mill to reduce its thickness by 2-20%, then the strip fed once more in the same direction through the same rolling mill line, then the strip is rolled again in at least one of said initial cold rolling mills whereby the strip consecutively is cold rolled in at least one of said further cold rolling mills and in at least one of said initial cold rolling mills, comprising cold rolling in at least three cold rolling mills without intermediate annealing, reducing the thickness totally by 30-75% before the strip again is annealed and pickled.