Continuous molten metal plating method, hot dip galvanized steel strip, and continuous molten metal plating facility

摘要

In the manufacturing method of hot-dip metal-plated steel strip that controls the amount of plating applied using a gas wiping nozzle, suppress the occurrence of plating surface defects and stably manufacture high-quality hot-dip metal-plated steel strip at a lower cost. An object of the present invention is to provide a continuous molten metal plating method, a hot dip galvanized steel strip, and a continuous molten metal plating facility capable of performing the above. In a continuous molten metal plating method in which a steel strip is continuously immersed in a molten metal plating bath and gas is blown from a gas wiping nozzle to the steel strip immediately after being drawn out of the molten metal plating bath, the amount of plating adhered is controlled. Continuous molten metal plating that controls the temperature T of the wiping gas injected from the gas wiping nozzle according to the D / B value represented by the ratio of the distance D between the wiping nozzle tip and the steel strip and the gas wiping nozzle gap B Method.