MANUFACTURING METHOD OF HIGH MANGANESE HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT COATABILITY

摘要

PURPOSE: A manufacturing method of a high manganese molten galvanizing steel plate with a superior platability are provided to improve the quality of plating without extra costs by using a surface thickening layer and a manganese depletion layer. CONSTITUTION: A manufacturing method of a high manganese molten galvanizing steel plate with a superior platability comprises next steps. The high manganese cold rolled steel sheet is a annealing process performed to the temperature of 750~850°C. The high manganese cold rolled steel sheet is pickled to the acid solution of the concentration 5~25% after cooling the annealed cold rolled steel sheet. A pickled steel sheet is heated with the temperature of 480~800°C. A plating bath including Al processes a melting zinc coating process. The high manganese cold rolled steel sheet comprises the manganese 5~35 weight%.