Method for removing foreign matter on roller surfaces in hot galvanizing horizontal type annealing furnace

Abstract

The invention relates to a method for removing foreign matter on the roller surfaces in a hot galvanizing horizontal type annealing furnace. The method comprises the fowling steps that (1) strip steel with the thickness being 0.5-0.7 mm is prepared at an inlet; (2) the strip steel is cleaned through alkali liquor with the concentration being 2+/-0.5%, electrolytically cleaned and rinsed through hot water, and when the strip steel is dried, blowing-sweeping is conducted on the surface of the strip steel through hot air at the temperature larger than or equal to 120 DEG C; (3) after the strip steel for removing completely enters the furnace, all main burners on a direct-fired section (DFS) are closed, only an ignition burner is reserved, and a radiant heating section (RHS) is subjected to heat preservation at the temperature of 500 DEG C; (4) the tension of a furnace area is set to be 1.5-2.5 KN; (5) fans on a cooling section are all started; (6) a unit operate in a speed of 30m/min; (7) after 3-6 roller removing cycles, a long sample about 2.5-3 m of the roller removing strip steel is taken at an outlet, the lower surface of the long sample is polished through a gauze mesh, if no roller mark appears, the roller mark is removed, and if the roller mark is not removed, the step (6) and the step (7) continue to be conducted; and (8) after the foreign matter is removed, before a normal steel roll is led in, ignition is conducted to increase the temperature so as to recover all relevant parameters, and the unit enters the normal producing state.

Description

technical field [0001] The invention relates to a method for removing foreign matter, in particular to a method for removing foreign matter on a roll surface in a hot-dip galvanizing horizontal annealing furnace, and belongs to the technical field of cold-rolled hot-dip galvanizing. Background technique [0002] In the modern cold-rolled hot-dip galvanizing process, in order to improve the performance of the strip steel and the needs of the hot-dip galvanizing process, the strip steel is recrystallized and annealed through the annealing furnace, so that the work-hardened strip steel after cold rolling can return to the original normal crystal structure, which is convenient for future mechanical processing, and at the same time removes the iron oxide scale and residual grease on the surface of the strip steel to ensure a certain degree of cleanliness on the surface of the strip steel. Diffusion, improve the adhesion of the zinc layer, and can also compensate the heat loss of ...

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Invention patent 201510968915.6, according to the tension area of ​​the top roller and bottom roller described in the article, it can be seen that the solution described in this article is a vertical annealing furnace, and the thickness of the steel plate described in this article is between 1.2 and 1.5mm. For a horizontal annealing furnace, While ensuring the contact area between the strip steel and the roller surface, it cannot be completed without contacting the lower surface of the cooling section; the vertical annealing furnace can set the tension of different tension areas in the furnace, but all areas of the horizontal annealing furnace are One tension, tension partition control can not be realized

In this article, the roll diameter correction amount is 0.5-1% of the original roll, and our method has positive and negative values. This setting can effectively prevent the joint force of the furnace rolls from being imagined, so that all furnace rolls can be cleaned at the same time; The method in this paper needs 6-8 volumes to complete. The structure of the horizontal annealing furnace is completely different from that of the vertical annealing furnace. This method cannot be applied to the horizontal furnace.

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