Apparatus for manufacturing steel strip, continuous annealing facility, and manufacturing method

Abstract

An apparatus for manufacturing a steel strip, includes: a first water tank part that stores cooling water for immersing and cooling a steel strip; a water cooling nozzle unit that is provided in the first water tank part and injects cooling water to a surface of the steel strip; a second water tank part connected to the first water tank part through a joining port; an opening and closing door that opens and closes the joining port; and a conveyance control part that conveys the water cooling nozzle unit such that the water cooling nozzle unit passes through the joining port and is positioned at either a cooling water injection position inside the first water tank part or a non-water cooling standby position inside the second water tank part.

1 - 8 . (canceled) 
     
     
         9 . An apparatus for manufacturing a steel strip, comprising:
 a first water tank part that stores cooling water for immersing and cooling a steel strip;   a water cooling nozzle unit that is provided in the first water tank part and injects cooling water to a surface of the steel strip;   a second water tank part connected to the first water tank part through a joining port;   an opening and closing door that opens and closes the joining port; and   a conveyance control part that conveys the water cooling nozzle unit such that the water cooling nozzle unit passes through the joining port and is positioned at either a cooling water injection position inside the first water tank part or a non-water cooling standby position inside the second water tank part.   
     
     
         10 . The apparatus for manufacturing a steel strip according to  claim 9 , wherein the water cooling nozzle unit is supported by a support part connected to the conveyance control part, and the support part includes an eaves portion that closes the joining port when the water cooling nozzle unit is located at the cooling water injection position. 
     
     
         11 . The apparatus for manufacturing a steel strip according to  claim 9 , wherein the water cooling nozzle unit includes a restraint roll that restrains the steel strip by at least a pair of rolls, in addition to a water injection nozzle that injects the cooling water to the surface of the steel strip. 
     
     
         12 . The apparatus for manufacturing a steel strip according to  claim 10 , wherein the water cooling nozzle unit includes a restraint roll that restrains the steel strip by at least a pair of rolls, in addition to a water injection nozzle that injects the cooling water to the surface of the steel strip. 
     
     
         13 . A continuous annealing facility for a steel strip, comprising the apparatus for manufacturing a steel strip according to  claim 9  in a cooling zone. 
     
     
         14 . The continuous annealing facility for a steel strip according to  claim 13 , wherein the cooling zone is supplied with a reducing gas or a non-oxidizing gas. 
     
     
         15 . A method for manufacturing a steel strip using the apparatus for manufacturing a steel strip according to  claim 9 , the method comprising:
 (a) cooling the steel strip without injecting cooling water to the surface of the steel strip in the first water tank part;   (b) supplying cooling water to the first water tank part and the second water tank part after completion of (a);   (c) opening the opening and closing door of the joining port;   (d) conveying the water cooling nozzle unit such that the water cooling nozzle unit passes through the joining port and moves from the non-water cooling standby position to the cooling water injection position; and   (e) injecting cooling water to the surface of the steel strip using the water cooling nozzle unit, and immersing and cooling the steel strip in the cooling water stored in the first water tank part.   
     
     
         16 . A method for manufacturing a steel strip using the apparatus for manufacturing a steel strip according to  claim 9 , the method comprising:
 (a) injecting cooling water to the surface of the steel strip using the water cooling nozzle unit, and immersing and cooling the steel strip in the cooling water inside the first water tank part;   (b) conveying the water cooling nozzle unit such that that the water cooling nozzle unit passes through the joining port after completion of (a) and moves from the cooling water injection position to the non-water cooling standby position;   (c) closing the opening and closing door of the joining port;   (d) draining at least the cooling water inside the first water tank part; and   (e) cooling the steel strip without injecting cooling water to the surface of the steel strip in the first water tank part.   
     
     
         17 . A method for manufacturing a steel strip, in which a steel strip is manufactured using the continuous annealing facility for a steel strip according to  claim 14 .