| 摘要 |
PURPOSE: A method is provided which easily manufactures a Zn-Al alloy plated steel sheet in a galvanized steel sheet manufacturing line. CONSTITUTION: The method for manufacturing a Zn-Al alloy plated steel sheet comprises the steps of: fluidizing powder in a fluidized bed formation tank(240) with a gas blown from the lower part by receiving Zn-Al powder or pure aluminum powder having an average particle size of 45 microns or less and comprising 1 wt.% or more of Al and a balance of Zn from a powder supplying unit(246); forming a fluidized bed zone of powder supplied into the upper plating tank(220) by injecting the powder fluidized in the fluidized bed formation tank(240) into an upper plating tank(220); taking a charge powder in the fluidized bed zone to plus or minus so that the powder is electrically charged; fusing powder on the surface of the steel sheet by passing a hot dipped galvanized steel sheet which is heated to a temperature of 420 to 730 deg.C and grounded through the fluidized bed zone in which the powder is electrically charged; and cooling the reheated steel sheet after reheating the powder fused steel sheet to a temperature of 420 to 730 deg.C for 1 to 5 seconds.
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