Manufacturing method of high-strength hot-dip galvanized metal steel strip and high-strength hot-dip galvanized metal steel strip

摘要

PROBLEM TO BE SOLVED: To obtain a hot-dip galvanizing property for producing a high-strength hot-dip galvanized steel strip even if the steel strip after cold rolling is heat-treated less than recrystallization annealing of the steel strip. Provide a method. The "good plating property" of the present invention deals with "plating wettability between the molten metal and the steel strip". SOLUTION: The cold rolling step of cold rolling a hot rolled steel strip or an annealed steel strip, and a plating step of allowing a cold rolled steel strip to enter a plating bath which is a molten metal to coat the molten metal are included. A method for producing a molten metal plated steel strip, the cold rolled steel strip is maintained below the recrystallization temperature after the cold rolling step and enters the plating bath, and the plating step is cold rolled onto the molten metal. It is characterized in that the molten metal is coated while applying vibration in the plating bath while the steel strips are in contact with each other. [Selection diagram] Fig. 1