HOT-DIP AL-PLATED STEEL SHEET PRODUCTION METHOD, AND HOT-DIP AL-PLATED STEEL SHEET

摘要

Provided is a hot-dip Al-plated steel sheet production method in which fine spangles are stably formed on a surface of a plating layer. The hot-dip Al-plated steel sheet production method includes a composition adjustment step for adjusting the composition of a hot-dip Al-plating bath (3) having aluminium as the main component so that a matrix alloy including B is added so that the concentration of B is at least 0.005 mass%, and so that the concentration of K is more than 0 mass% and less than 0.0005 mass%; and gas is supplied into the hot-dip Al-plating bath and floating substances on the bath surface are removed, thereby lowering the concentration of K in the hot-dip Al-plating bath.