METHOD FOR MANUFACTURING THIN STEEL SHEET HAVING SUPERIOR SURFACE APPEARANCE FOR CONTAINER, AND FACILITY THEREFOR

PROBLEM TO BE SOLVED: To provide a method for manufacturing a thin steel sheet for a container, which prevents an orange peel from forming on the surface of the thin steel sheet for the container, avoids the roughening of a rolling roll to enhance the quality of the steel sheet, and avoids the decrease of the unit consumption of the rolling roll, and to provide a facility therefor. SOLUTION: This manufacturing method includes passing the sheet while controlling oxygen concentration in an atmosphere in a water spraying facility 2 and/or a water quenching facility 3 in the outlet side of a continuous annealing furnace to 1,000 ppm or lower. The manufacturing method also includes controlling the concentration of dissolved oxygen in a coolant to 2 ppm or lower, which is used in the water spraying facility 2 and/or in the water quench facility 3 installed in the outlet side of the continuous annealing furnace. Thereby, the manufacturing method inhibits the steel sheet from being oxidized in the outlet side of the continuous annealing furnace 1, and prevents the surface of the steel sheet from being roughened, which is referred to as orange peel. COPYRIGHT: (C)2008,JPO&INPIT