To provide a method of producing a hot dip zinc-aluminum alloy plated steel sheet which has excellent workability in bending and excellent corrosion resistance in the part.
In the method of producing the hot dip zinc-aluminum alloy plated steel sheet, the steel sheet is contacted with a galvanizing bath containing 20 to 95 wt.% Al to control the coating weight thereof to the fixed one. In this case, the Al-containing hot dip zinc-aluminum alloy plated steel sheet in a cooling stage after the plating or subjected to cooling is heated in a steel strip state, and, provided that the optional temperature from 235 to 80°C of the Al-containing plated steel sheet is defined as t°C, and the time for which the steel sheet is present in the range from 235 to the t°C is defined as h, the steel is made into the state where the inequality of 1.2(100/t-50)3≤h is satisfied for at least one time by using a heat insulating box and/or a heat insulating chamber.
OTA KOJI
TANAKA TOSHIYUKI
MORI KENSUKE
Next Patent: MELT-SPRAYING DEVICE AND ITS METHOD