METHOD FOR MANUFACTURING DIRECTLY QUENCHED THICK STEEL PLATE WITH THIN WALL

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a thick steel plate which has excellent uniformity of material properties in a longitudinal direction of the steel plate, using a passage type cooling device.;SOLUTION: A rolling-cooling method employs a rolling-cooling apparatus having a first passage type cooling device and a second passage type cooling device, which are sequentially arranged on a downstream side of a reversible hot rolling mill, includes the following steps of: 1. cooling a steel plate after finish rolling by the first passage type cooling device such that a cooling starting temperature becomes the same at the front end and the tail end of the steel plate when the steel plate is cooled by the second passage type cooling device; and 2. cooling the steel plate while passing the steel plate through the second passage type cooling device at a constant rate.;COPYRIGHT: (C)2013,JPO&INPIT