COOLING DEVICE FOR HOT ROLLED STEEL PLATE

摘要

PURPOSE:To facilitate the flow control in the plate width direction and to increase the cooling capacity of a steel plate by injecting a cooling water from numerous nozzle groups on the upper face of a hot rolled steel plate and by arranging the angle for the rolling direction of a water pouring part at the optimum acute angle. CONSTITUTION:The cooling is performed by injecting a cooling water in mesh like from the nozzle group 6 linearly fitting to the nozzle header in the rolling right angles direction and the nozzle group 8 fitted obliquely in parallel to the nozzle header 7 in the rolling direction on the upper face of the hot rolled steel plate in a mill line 10. In said cooling device said nozzle group 8 is arranged so that the line segment connecting the collision point of the falling water from the nozzle group 8 and the steel plate makes the angle 30 deg.-90 deg. for the rolling direction. In this way the cooling capacity is increased by increasing the water on the plate. Moreover the water is saved for a narrow width material by providing a flow control valve 9 on each header 7 or the adequate cooling control is enabled for the uneven temp. distribution material.