| 摘要 |
PURPOSE:To prevent the deterioration in pickling performance/and to improve said performance by forming the bottom plate of a pickling tank to the shape coinciding with the shape of a steel strip to be passed therethrough, disposing said plate in proximity to the steel strip and increasing the size of the spaces between both ends in the transverse direction of the steel strip and both side walls of the pickling tank. CONSTITUTION:The bottom plate 16 of the pickling tank or the curved plate to be installed in the lower part of the pickling tank is formed to the shape coinciding with the catenary curve formed by the steel strip 5 to be passed through the pickling tank and the above- mentioned bottom plate 15 or curved plate is disposed in extreme proximity to the steel strip 5 passing in the tank. The spaces between the ends 13 in the transverse direction of the steel strip 5 and the side walls 14 of the pickling tank are provided to the larger sizes. The thickness in the boundary layer of an acid soln. 4 around the steel strip 5 is thereby decreased and the level difference of the acid soln. between the inlet and outlet of the tank is decreased. The exposing length of the steel strip 5 in the inlet of the tank is thereby decreased, by which the deterioration in pickling performance is prevented and the pickling performance is improved. The overflow of the acid soln. 4 beyond the partition is obviated and the adequate concn. difference between the tanks is maintained. The cost of the operation is thus reduced.
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