THICK PLATE ROLLING METHOD

摘要

PURPOSE:To reduce a trimming loss after rolling of a finishing pass by forecasting the width widening quantity caused at the finishing pass in the thick plate rolling and by correcting the roll opening degree is width widening pass rolling so as to make the plate thickness corresponding to the forecasted value thereof. CONSTITUTION:The width widening quantity DELTAw caused in a finishing pass is forecasted and the roll opening degrees at the time of a width widening pass rolling are corrected in order that the plate thickness H2 of a rolling material of after completion of the width widening roll can satisfy the following equation: H2=H1XW0/(w-DELTAw) (wherein H1 is the plate thickness after completion of a forming pass, W0 is slub width of blank material, (w) is roll finish width), in a thick plate rolling producing a thick steel plate by hot rolling a blank material slub heated by a thick plate rolling mill in the order of a forming pass, width widening pass and finishing pass. The plate width of a rolling material of after is finishing pass rolling is made nearly the same as the necessary target width and the trimming loss can be thus reduced.