| 摘要 |
PURPOSE: A method for manufacturing a high strength galvanized steel sheet having with superior coating adhesion is provided to prevent a coating failure by removing Si and Mn oxide after first annealing and controlling surface roughness. CONSTITUTION: A method for manufacturing a high strength galvanized steel sheet having with superior coating adhesion comprises the steps of: degreasing a cold-rolled steel sheet, heating the cold-rolled steel sheet to 700-900°C and cooling, spraying slurry, in which high-pressure water and an abrasive are mixed, to the surface of the cold-rolled steel sheet at high pressure, and reheating the cold-rolled steel sheet to 400-550°C. The average surface roughness of the cold-rolled steel sheet after high-pressure spraying is 0.8-2.0μm. |
