PURPOSE: To continuously produce a hot dip aluminized steel sheet having an intermetallic compd. exposed to the surface by grinding at least one side of a hot dip aluminized steel sheet with a rotating brush to remove an Al layer on the side while in a molten state.
CONSTITUTION: In a continuous hot dip aluminizing line, a steel sheet 1 is pulled up from a hot dip aluminizing bath 6, the amt. of molten Al stuck is regulated with gas wiping nozzles 5 and immediately at least one side of the hot dip aluminized steel sheet 1 is ground with a brush roll 2 to remove an Al layer on the side. A steel brush having wires of ≤0.3mm diameter is used as the brush. Thus, a thin layer of an intermetallic Fe-Al-Si compd. formed on the surface of the steel sheet 1 is exposed to the surface. The resulting hot dip aluminized steel sheet has superior function as a base steel sheet to be coated with heat resistant paint or to be enameled.
TOGAWA HIROSHI
HIROSE YUSUKE
