To provide a method for manufacturing a hot dip Al coated steel sheet which suppresses the occurrence of plating defects.
The method for manufacturing the hot dip Al type coated steel sheet having the decreased plating defects comprises heating a steel sheet in an atmosphere containing moisture of a dew point of below -10°C in such a manner that the maximum ultimate temperature of the sheet attains 650 to 880°C and the time when the sheet is heated to ≥600°C attains ≥10 seconds, then cooling the sheet to control the sheet temperature to 630 to 700°C and immersing the sheet into an Al plating bath of 620 to 720°C in bath temperature for ≤3 seconds, in which the Al plating bath is composed of, mass %, 0.03 to 2% the total of one kind or more of elements of Mg, Ca, Li and Mn, 0.01 to 15% Si, and the balance Al and inevitable impurities. The high-speed passage of the hot dip Al coated steel sheet is made possible.
KUROSAKI MASAO
ISAKI TERUAKI
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Etsuichi Matsumoto