HOT DIP METAL COATING METHOD AND HOT DIP METAL COATING APPARATUS

• Main Author: HORI TAKAYUKI
• Format: Patent
• Language: English
• Published: 31.10.2001
• Edition: 7
• 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

PROBLEM TO BE SOLVED: To provide a hot dip metal coating method with which dross defect or ripple defect of a steel sheet obtained in a continuous hot dip metal coating for steel sheet can effectively be prevented, and a hot dip metal coating apparatus. SOLUTION: In the hot dip metal coating method, the steel sheet is continuously dipped into coating bath of molten metal through a snout for shutting off the atmosphere, and after turning around a sink roll disposed in the coating bath to change this running direction, the steel sheet is drawn upward from the coating bath surface to continuously apply the hot dip coating. Further, in the hot dip metal coating method, the waving of the bath surface in the snout is measured, and based on the obtained measured result, the vibration for eliminating the waving, is given to a vibrating plate dipped into the snout and the coating bath in the snout. This hot dip metal coating apparatus is the one suitably used for this hot dip metal coating method.