Pickling process and device utilizing residual heat of hot rolled silicon steel strip

Abstract

The invention discloses pickling process and device utilizing residual heat of a hot rolled silicon steel strip. According to the pickling process, a 120-500 DEG C steel strip which is taken out from a cooling section of a normalizing furnace enters a shot blasting machine to carry out shot blasting and then directly enters the bottom of a pickling tank to carry out pickling, and the steel strip after pickling enters a reeling machine to carry out reeling to obtain a steel strip to be rolled, wherein an oxide scale of the steel strip to be rolled is removed. With the adoption of the pickling process and device, as the residual heat of the silicon steel strip after normalizing is utilized to carry out pickling, the reaction speed of the oxide scale and acid at high temperature is increased, the effect is better, the concentration and the temperature of the acid can be lowered, the warming is not needed, and the energy is saved; in addition, as the high-temperature steel strip is arranged at the bottom of the pickling tank after entering the pickling tank, the heated acid liquor is difficult to volatilize, and the environment pollution is avoided. Compared with the existing descaling process, according to the pickling process, the adopted equipment is less, a flame heating device can not be needed, the energy, the equipment cost and the production cost are saved, and the pickling process is economic and feasible.

Description

technical field [0001] The invention relates to the field of steel processing and manufacturing, in particular to a hot-rolled silicon steel strip residual temperature pickling process and its device. Background technique [0002] The oxide scale on the surface of the hot-rolled steel strip is the secondary oxide scale formed at high temperature when the steel strip is rolled on a hot continuous rolling mill. Due to the difference in the chemical composition of steel, rolling temperature, finish rolling temperature, post-rolling cooling rate and coiling temperature, the organization and structure of surface oxide scale are also different. The iron oxide scale on the surface of the steel strip must be removed before cold rolling. [0003] Removing the oxide scale on the surface of the steel strip is commonly known as descaling. The descaling methods are generally divided into three types: mechanical descaling, chemical descaling and mixed mechanical and chemical descaling. ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of large energy consumption, high acid consumption, high cost and environmental pollution in the existing technology for removing iron scale on the surface of steel strips, and provide a simpler, low energy consumption, and effective hot-rolled silicon steel strip residue Warm Utilization Pickling Process and Its Equipment

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