CONTINUOUS HOT DIP METAL PLATING METHOD HOT DIP ZINC PLATED STEEL STRIP AND CONTINUOUS HOT DIP METAL PLATING EQUIPMENT

摘要

The purpose of the present invention with respect to a method for producing a hot dip metal plated steel strip in which a gas wiping nozzle is used to control a plated weight is to provide the following: a continuous hot dip metal plating method according to which the occurrence of plating surface defects is suppressed and high quality hot dip metal plated steel strip can be produced more inexpensively and stably; a hot dip zinc plated steel strip; and continuous hot dip metal plating equipment. The present invention is a continuous hot dip metal plating method in which a steel strip is continuously immersed in a hot dip metal plating bath and a gas is blown from a gas wiping nozzle onto the steel strip immediately after being pulled out from the hot dip metal plating bath so as to control a plated weight wherein the temperature T of a wiping gas sprayed from the gas wiping nozzle is controlled in accordance with a value D/B representing the ratio of a distance D between a gas wiping nozzle distal end and the steel strip and a gas wiping nozzle gap B.