To easily discover flaws on the surface of a slab, and to prevent degradation of the surface quality of a sheet product caused by the surface defect of the slab by providing a pickling equipment between a casting device to cast the slab and a hot rolling mill to roll the slab.
A slab 1 is pickled in a pickling tank 3, and then, the surface of the slab 1 is observed after the cleaning in water, and hot rolled preferably after removing defects of a surface layer. The slab 1 is charged in the pickling tank 3, the pickling tank 3 is covered by a cover 5, and the slab 1 is pickled one by one in a batch pickling equipment. Hydrochloric acid is fed from a hydrochloric acid tank 6 in the pickling tank 3 to pickle the slab 1. After the pickling, the hydrochloric acid is discharged into a discharged weak acid storage tank 7. Cleaning water is fed into the pickling tank 3 from a cleaning water tank 8 to clean the slab 1. Hume to be generated during the pickling is fed to an exhaust cleaning tower 9 and cleaned, and discharged into the atmosphere. Since scales are removed from the surface of the slab 1, flaws on the surface of the slab can easily be found.
NISHIMOTO SHOICHI
TANAKA KAZUAKI
SATANI HIDEYO
Next Patent: DESCALING DEVICE