A continuous casting slab descaling device and descaling method

Abstract

The invention provides a continuous cast billet descaling device and descaling method. The descaling device comprises a sand box, a blast nozzle and a sand blasting pipeline. The sand box is used forstoring sand grains. One end of the sand box is connected with the sand blasting pipeline through the blast nozzle, and the other end of the sand box is connected with an air inlet pipeline. The air inlet pipeline is used for delivering compressed air. The blast nozzle is used for blasting sand to the surface of casting blanks to conduct descaling. The descaling method comprises the steps that inthe continuous casting and continuous rolling production process, after a continuous cast billet is pulled out, an oxide scale is formed on the surface of the continuous cast billet, the continuous cast billet is rapidly cooled, and the oxide scale is in a pattern cracking shape; the sand grains are blasted to the surface of the continuous cast billet at high pressure; the sand grains are blastedto impact the surface of the cast billet at high pressure, and the oxide scale is broken up through dynamic pressure of the high-pressure sand grains in cracks and strips off from the surface of the steel billet. The problem that the surface temperature of a steel billet is decreased sharply due to high-pressure water descaling is solved. Meanwhile, the scale on the surface of the continuous castbillet can be effectively removed, and the surface quality of the cast billet is ensured.

Description

technical field [0001] The invention relates to the technical field of metal rolling, in particular to a continuous casting slab descaling device and a descaling method. Background technique [0002] The billet is oxidized at high temperature, forming a layer of dense iron oxide scale (scale) on its surface. If this layer of iron oxide scale cannot be removed before rolling, they will be pressed into the surface of the steel plate by the rolls during the rolling process. After annealing, straightening and falling off, the surface of the finished product will form convex and concave marks, which will seriously affect the surface quality of the product. The remaining oxide scale will also accelerate the wear of the roll and reduce the service life of the roll. If the product needs to be pickled, the residual iron scale will increase the difficulty of pickling and increase the acid consumption. Therefore, before the billet is rolled, the iron oxide scale on the surface must b...

AI Technical Summary

Problems solved by technology

[0003] The technical task of the present invention is to provide a continuous casting slab descaling device and descaling method for the above deficiencies in the prior art, which solves the problem of a sharp drop in the surface temperature of the slab caused by high-pressure water descaling, and can effectively remove the The iron sheet on the surface of the slab ensures the surface quality of the slab

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