| 摘要 |
PURPOSE: A manufacturing method of hot dipped galvanized steel sheet with high strength having superior plating close adherence by breaking oxide coating layer formed on the surface of strip even when elements that are difficult to be plated are contained in the strip as maintaining existing characteristics of the hot dipped galvanized steel sheet is provided. CONSTITUTION: In a method for manufacturing hot dipped galvanized steel sheet using high strength steel sheet containing at least silicon (Si), manganese (Mn), and phosphorus (P), the manufacturing method of hot dipped galvanized steel sheet with high strength comprises the steps of annealing the strip(1) by passing the strip through an annealing furnace(3); partially breaking the oxide coating layer by irradiating a laser onto an oxide coating film layer on the surface of the strip formed by silicon (Si) or manganese (Mn) in the annealing furnace; and plating the strip by dipping the oxide coating layer partially broken strip into a zinc pot(6), wherein an output of the laser is 1 to 100 kW, and the laser is irradiated from the snout part(4).
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