METHOD FOR MANUFACTURING HOT DIP GALVANIZING STEEL SHEET HAVING SUPERIOR WORKABILITY AND GOOD SURFACE APPEARANCE

摘要

A method for manufacturing a hot-dip galvanized steel sheet having excellent workability and surface appearance, according to an aspect of the present invention, includes: a plating step for putting a steel sheet to be coated into molten metal to plate the steel sheet with a metal plating material; and a first spraying step where the surface of the steel sheet to be coated on which the metal plating material is attached with a compressed humid gas mixture. The compressed humid gas mixture contains 0.0001-20.0 volume% of O2 and the rest of N2.