HOT DIPPING EQUIPMENT AND PRODUCTION OF HOT-DIP METAL COATED STEEL SHEET

• Main Authors: SHIGEMOTO HARUMI, IIDA YOSHIHIRO
• Format: Patent
• Language: English
• Published: 12.02.1991
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PURPOSE:To make it possible to cope with both of the production of a plated steel sheet requiring long-time alloying treatment and the production of a steel sheet requiring no long-time alloying treatment by providing a direction change device for a steel strip, a cooling zone, control valves, etc., and facilitating the switching of them. CONSTITUTION:At the time of producing a high-quality alloying hot dip galvanized steel sheet requiring long-time alloying treatment, a steel sheet 2 is passed as shown by a full line by using a bend floating device 11 and horizontal floating devices 18. At this time, valves 23, 24, 28 are opened and a valve 26 is closed, and air is supplied from a fan 19 to the floating devices 11, 18 and also a nonoxidizing gas is supplied into gas wiping nozzles 14. Subsequently, in the case of switching to low quality, the floating device 11 is switched to a deflector roll 16 and the steel sheet 2 is passed as shown by a dotted line. Then, the valves 23, 24 are closed, the valve 26 is opened, the valve 28 is closed, and the supply of the nonoxidizing gas is stopped.