PROCESS FOR PRODUCTION OF HOT-DIP COATED STEEL SHEETS AND HOT-DIP PLATING APPARATUS

摘要

A process for production of hot-dip coated steel sheets which comprises dipping a steel sheet continuously into a plating bath, drawing up the steel sheet continuously from the plating bath, and then blowing a gas against the surface of the steel sheet during the stage from the drawing-up till solidification of the metal deposited on the surface of the steel sheet to regulate the quantity of a deposit, wherein in blowing the gas against the surface of the steel sheet, the surface of the plating solution is enveloped in an atmosphere having an oxygen concentration of 0.05 to 21vol% and the oxygen concentration in a space wherein the gas collides against the drawn-up steel sheet is adjusted to 0.05 to 3vol%.