Furnace drying method for the strip steel surface coating

Abstract

The invention discloses a drying method for surface coating of strip steel, the drying method includes the procedures as follows: after the strip steel being normally and continuously coated on the production line, the hot wind is used for preliminary drying the coat surface, simultaneously the electromagnetic induction is utilized to heat the inside of the strip steel for inner drying, then the hot wind is utilized again for the final drying the coat surface. The invention dries the coat of the strip steel by outside hot wind and inner heating, the temperature changes uniformly in the drying process of the coat, the invention can effectively eliminate coat crazing and can prevent uneven depth caused by the production accumulation of the coat; the invention utilizes simultaneous drying process for the outside and the inside of the coat, achieving the same effect; the invention can decrease the heating temperature for the electromagnetic induction the strip steel, thereby being useful to cool the production of the strip steel.

Description

technical field [0001] The invention relates to a coating drying treatment method in the production process of coated strip steel. Background technique [0002] In order to meet the market's demand for high-quality coated strip steel, the coating on the surface of the strip steel is required to have high surface quality, such as high coating smoothness and uniform coating thickness, in addition to its anti-corrosion effect. In the production process of coated strip steel, the coating drying method has a great influence on the coating surface quality. In the prior art, the method for drying the surface coating of the strip is to use electromagnetic induction to generate eddy current heat inside the strip to dry the surface coating of the strip. This method has the advantages of simple process and fast coating drying speed. However, in order to realize fast drying on the production line, the electromagnetic induction temperature inside the strip must be increased accordingly,...

AI Technical Summary

Problems solved by technology

In the prior art, the method for drying the surface coating of the strip is to use electromagnetic induction to generate eddy current heat inside the strip to dry the surface coating of the strip. This method has the advantages of simple process and fast coating drying speed. However, in order to realize fast drying on the production line, the electromagnetic induction temperature inside the strip must be increased accordingly, which will cause the temperature of the strip to rise, which is not conducive to the cooling of the finished strip; If the coating is dried outside, the actually produced strips often have defects such as coating cracks and uneven coating thickness, which seriously affect the surface quality of the coated strip and reduce the qualified rate or product grade of the product. direct economic loss

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