STEEL PLATE COOLING METHOD AND IMMERSION BATH TYPE WATER COOLING DEVICE

摘要

PROBLEM TO BE SOLVED: To make uniform the temp. distribution of a steel plate in the longitudinal direction after cooling by setting the number of rotations at a steel plate inlet side larger than the number of rotations at a steel plate out let side in plural agitation devices with blade arranged to an immersion bath type water cooling device and increasing the number of rotations of the agitation device with the lapse of time. ;SOLUTION: Agitation devices 2₁-2_n, 3₁-3_n, having an impeller are arranged in an immersion bath type water cooling device 1. A steel plate 4 is transferred on a table roller 9 and guided into an immersion bath 5. Cooling water is supplied from a lower part water supply pipe 6a and an upper part water supply pipe 6b. A controlling 20 controls a number of revolution of the agitation device 2₁-2_n, 3₁-3_n. The number of rotations of the agitation device 2_m at a steel plate 4 inlet side is set larger than the number of rotations of the agitation device 2_m+1 at an outlet side. A temp. of cooling water in the immersion bath 5, in which inlet side is higher than outlet, is made uniform by adjusting the number of rotations. As time passes from cooling start, the temp. of cooling water is increased, cooling capacity is made uniform by increasing the number of rotations.;COPYRIGHT: (C)1998,JPO