APPARATUS FOR PRODUCING HOT-DOP METAL COATED STEEL SHEET WITH SUPERIOR WORKABILITY AND CORROSION RESISTANCE

摘要

The device of the present invention can enhance the quality of surface appearance through a nitrogen curtain section facilitating oxidation suppressing at a lower end portion of an air knife to suppress an oxide from being generated from an upper portion of a coating bath and block adsorption of the oxide to the surface of a coated layer.;This device includes lower gas discharge bars spaced apart from the surface of the coating bath by a predetermined distance and discharging a nitrogen gas in a direction of the surface of the coating bath along a circumference of the coated steel sheet; a side cover extending upwardly slopingly in a direction of the coated steel sheet from the sides of the lower gas discharge bars; and upper gas discharge bars formed at an upper end of the side cover and discharging a nitrogen gas downwardly.

主权项

1. A device installed between a surface of a coating bath to produce a hot dop metal coated steel sheet and an air knife equipment to form a non-oxidation atmosphere in a circumference of a coated steel sheet ascending from the coating bath, the device comprising:
lower gas discharge bars 41 and 42 spaced apart from the surface of the coating bath 3 by a predetermined distance and discharging a non-oxidation gas in a direction of the surface of the coating bath 3 along the circumference of the coated steel sheet 1; a side cover 43 extending upwardly slopingly in a direction of the coated steel sheet 1 from the sides of the lower gas discharge bars 41 and 42; and upper gas discharge bars 44 and 45 formed at an upper end of the side cover 43 and discharging a non-oxidation gas downwardly.