Secondary cooling device and secondary cooling method for continuous casting

Abstract

What is provided is a secondary cooling device for continuous casting that is configured to cool a slab, which is sent in a casting direction, by spraying cooling water to the slab surface. The secondary cooling device for continuous casting includes a plurality of rolls disposed side by side in the vertical direction along a casting direction and a spray nozzle configured to spray the cooling water to the slab surface from between the plurality of rolls. The spray nozzle is provided such that the cooling water spray axis of the spray nozzle is inclined with respect to the major axis direction of a spray range of the cooling water on the slab surface, the major axis of the spray range is rotated upward around an axis line that is a perpendicular line to the slab surface from the spray nozzle, and the center of the spray range is positioned above a middle position between a contact position between the roll that is present above the spray nozzle and the slab surface and a contact position between the roll that is present below the spray nozzle and the slab surface.

1 . A secondary cooling device for continuous casting that is configured to cool a slab, which is sent in a casting direction, by spraying cooling water to a slab surface, the secondary cooling device comprising:
 a plurality of rolls disposed side by side in a vertical direction along the casting direction; and   a spray nozzle configured to spray the cooling water to the slab surface from between the plurality of rolls,   wherein the spray nozzle is provided such that   a cooling water spray axis of the spray nozzle is inclined with respect to a major axis direction of a spray range of the cooling water on the slab surface,   a major axis of the spray range is rotated upward around an axis line that is a perpendicular line to the slab surface from the spray nozzle, and   a center of the spray range is positioned above a middle position between a contact position between the roll that is present above the spray nozzle and the slab surface and a contact position between the roll that is present below the spray nozzle and the slab surface.   
     
     
         2 . The secondary cooling device for continuous casting according to  claim 1 ,
 wherein the spray nozzle is provided such that   the cooling water spray axis is inclined at 30° to 40° with respect to the major axis direction of the spray range of the cooling water on the slab surface, and   the major axis of the spray range is rotated by 5° to 15° upward around the axis line that is the perpendicular line to the slab surface from the spray nozzle.   
     
     
         3 . A secondary cooling method for continuous casting, the secondary cooling method comprising:
 a step of cooling a slab by spraying cooling water to a slab surface from a spray nozzle disposed between a plurality of rolls disposed side by side in a vertical direction along a casting direction,   wherein a cooling water spray axis of the spray nozzle is inclined with respect to a major axis direction of a spray range of the cooling water on the slab surface,   a major axis of the spray range is rotated upward around an axis line that is a perpendicular line to the slab surface from the spray nozzle, and   a center of the spray range is positioned above a middle position between a contact position between the roll that is present above the spray nozzle and the slab surface and a contact position between the roll that is present below the spray nozzle and the slab surface.