METHOD FOR MANUFACTURING ZINC COATED STEEL SHEET HAVING EXCELLENT COATING ADHESION AND ZINC COATED STEEL SHEET PRODUCED USING THE SAME

摘要

The present invention relates to a method of manufacturing a galvanized steel sheet excellent in plating adhesion and a galvanized steel sheet produced thereby. According to an embodiment of the present invention, there is provided a method of manufacturing a steel sheet, Charging the prepared ground steel sheet into a non-oxidizing furnace and heating the steel sheet at a heating rate of 2.5 to 4.5 ° C / s to less than 500 to 650 ° C; Heating the primary heated ground steel sheet to a temperature of 750 to 850 ° C in a reducing atmosphere; Cooling the secondary heated ground steel sheet; And a step of immersing the cooled ground steel sheet in a plating bath to form a zinc plated layer on the base steel sheet. In the first heating, 16 to 50% by volume of CO ₂ , the balance of N ₂ , H ₂ O and CO and a gas comprising at least one selected from the group consisting of CO and CO is charged into the oxidation-reduction furnace, and a galvanized steel sheet produced by the method.