Patent ID: 8231826
Filing Date: 2012-07-31
Classification: B21B

Abstract:
1. A method for cooling a hot strip that has been subjected to a finish rolling while being conveyed over a run-out table, the method comprising: (a) ejecting a coolant through a plurality of cooling nozzles at a speed of 7 m/s or higher towards an upper surface of a steel strip at an angle tilted towards an upstream side in a steel-strip traveling direction; and (b) purging the coolant by using a pinch roll disposed on the upstream side with respect to a position where the coolant is ejected, wherein the plurality of cooling nozzles are arranged in a manner such that the plurality of cooling nozzles are provided in a steel-strip width direction and that the plurality of cooling nozzles form a plurality of rows in the steel-strip traveling direction, wherein positions of the plurality of cooling nozzles provided in the plurality of rows in said width direction are set in a manner such that the positions in said width direction in an upstream row and the positions in said width direction in an adjacent downstream row are staggered, wherein an angle between the steel strip and the flow of the coolant elected from the cooling nozzles is 55° or smaller.