in the case of normal use and maintenance, each pair of rolls is used to the scrap size, and the average millimeter diameter rolling volume is 4500-6500 tons/mm.
with the development of roll manufacturing technology, on the basis of high nickel-chromium infinite chilled rolls, improved high-nickel-chromium infinite chilled rolls have been developed and gradually applied to a few rolling mills, and they are well-evaluated and regarded as wear resistance and both accident resistance. 5m wide and heavy plate rolling mill rolls will be considered for use in the future.