Patent ID: 9649679
Date: 2017-05-16
CPC Classifications: B21B

Claim:
1. A water-blocking apparatus for cooling water for a hot-rolled steel sheet, which blocks cooling water sprayed onto the hot-rolled steel sheet at a sprayed water density of higher than 4 m 3 /m 2 /min and equal to or less than 10 m 3 /m 2 /min when the hot-rolled steel sheet is cooled after finish rolling of a hot-rolling process, the water-blocking apparatus comprising: a plurality of water-blocking nozzles which are flat spray nozzles spraying water-blocking water onto the hot-rolled steel sheet, wherein the plurality of the water-blocking nozzles are arranged so that impact areas of the water-blocking water respectively sprayed from the water-blocking nozzles are continuously lined up in a straight line in a width direction of the hot-rolled steel sheet on a surface of the hot-rolled steel sheet and the adjacent impact areas partially overlap, the plurality of the water-blocking nozzles are configured to form a water wall continuously extending along the width direction on the impact areas, and a momentum F