Primetals Technologies Japan, Ltd.

Nisshin Steel Co., Ltd.

Hideaki Suemori

Kosei Tsuji

Ryusuke Nakatsuka

Koichi Nakamura

Masayoshi Tanaka

Norikatsu Kakemizu

Ryuuichi Yamashita

Takashi Yamamoto

Hisao Morishita

To prevent over-pickling during pickling pause, shorten the time required to switch between pickling operation and pickling pause, and heat acid solution efficiently, a pickling device includes: a pickling tank for storing acid solution and for pickling a steel strip by allowing the steel strip to travel therethrough while the steel strip is immersed in the acid solution; a heat exchanger for heating the acid solution in the pickling tank; a circulation tank for storing the acid solution, provided separately from the pickling tank; an acid-solution circulation device configured to circulate the acid solution between the pickling tank and the circulation tank; a control device configured to withdraw the steel strip from the acid solution; and a guide plate disposed in the pickling tank and configured to guide the acid solution circulated in the pickling tank by the acid-solution circulation device to the heat exchanger.

Pickling device

To prevent over-pickling of a steel strip during pickling pause, and shorten the time required to switch between pickling operation and pickling pause, a pickling device includes: a pickling tank for storing acid solution and for pickling a steel strip by allowing the steel strip to travel therethrough while the steel strip is immersed in the acid solution; a heat exchanger for heating the acid solution in the pickling tank; a circulation tank for storing the acid solution, provided separately from the pickling tank; an acid-solution circulation unit configured to circulate the acid solution between the pickling tank and the acid-solution storage tank; and a control device configured to control the acid-solution circulation device to maintain a liquid level of the acid solution in the pickling tank at a level below a traveling height of the steel strip.

Pickling device and pickling pause operation method

The present invention is provided with: a duct of which one end interconnects to a wiping nozzle () and the other end is open; a first valve () that controls the actual gas pressure (P') of the wiping nozzle (); a second valve () that controls the gas flow rate (Q) dissipating to outside the system from another branched duct; a wiping pressure setting unit () that sets the set gas pressure (P) of the wiping nozzle (); a first valve aperture setter () that sets the valve aperture of the first valve (); a second valve aperture setter () that sets the valve aperture of the second valve (); and a computation processing unit () that presents to the first valve aperture setter () the valve aperture at which the gas pressure (P&#x2032;) matches a set gas pressure (P), and presents to the second valve aperture setter () the valve aperture at which the total gas flow rate (QT) supplied from a gas supply device () becomes uniform.

Method and device for controlling amount of hot dip galvanization adhesion

Growing community of inventors

Hiroshima, Japan

Hideaki Suemori