Rolling apparatus for producing Yamagata steel from steel strip and rolling method of Yamagata steel using its rolling apparatus

摘要

The present invention is a rolling apparatus which is excellent in surface property and has a small outer radius of the corner portion, and is a rolling method using the rolling apparatus. The rolling apparatus of the present invention is a heating apparatus for heating a steel strip running, a pair of vertical rolls in which a grooved hole is formed on a roll surface, and a pair of horizontal rolls in which a pair of grooved holes are formed at the central portion of one of the roll surfaces, and a double hole is provided in which a pair of horizontal rolls are arranged. A rolling apparatus in which the mold mill group is disposed close to each other. A direct current heating device (H2) may be disposed as the heating apparatus. Since the thickness of the central part of the steel strip is greatly rolled by the universal mill, the steel of the product can be rolled from the steel strip of the thickness equal to the flange thickness of the Yamagata steel.