| 摘要 |
PURPOSE: To provide a plating method capable of solving in a preset ordinary industrial line problems of deterioration of productivity and plating quality generated when continuously producing hot dipped galvanized iron and galvannealed steel sheet. CONSTITUTION: In a plating method for continuously performing hot dip galvanizing and galvannealing by leading a strip in a plating pot, the hot dip coating method having superior operation change efficiency from GI(hot dip galvanizing) mode to GA(galvannealing) mode comprises a step of performing hot dip galvanizing in a plating pot containing 0.16 to 0.20 wt.% of aluminum; and a step of starting galvannealing from a time point when aluminum content is 0.155 wt.% or less in a process of adjusting content of Mn in the plating pot to 0.01 to 0.1 wt.% and adjusting content of Al in the plating pot to 0.155 to 0.12 wt.%, wherein the strip contains 0.45 wt.% or more of Mn.
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