Method of applying electric field energy on molten steel to improve quality of silicon steel billet

Abstract

The method of applying electric field energy on molten steel to improve quality of silicon steel billet is to introduce electric field energy with the electric field energy generator and the electrodes into molten steel, the electric field energy waveform is duty ratio variable square wave of energy 1000 J-180 MJ, voltage 100-1800V, current 100A-8KA, frequency not higher than 25 Hz and duty ratio of 5-90 %. The electric field energy generator is suitable for use in industrial production and controllable in electric field energy parameters. The treated molten steel results in refined billet structure with obviously increased global crystal, less defaults and high quality.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for applying electric field energy to molten steel in order to improve the quality of silicon steel slabs. Background technique [0002] Due to the special composition of silicon steel and high silicon content, the coarse grain structure and dendrites of the continuous casting slab solidification structure are very developed, but the number of spherical grains in the center is very small or even almost none, so it is very difficult to roll silicon steel plates. It is prone to quality defects, especially corrugated plate shape defects. In order to solve the above defects, electromagnetic stirring and light reduction technology are usually used. In recent years, when the metal is in a completely liquid state, the technology of applying electric field energy to it to change the structure of the liquid metal and refine the solidified structure ...

AI Technical Summary

Problems solved by technology

Some experimental equipment uses a frequency of hundreds or even thousands of hertz without considering the effect of the duty cycle on the released energy. In this way, when applied to large-scale industrial production, the processing effect will become very weak due to the skin effect

Some experimental equipment directly applies the electric energy in the power supply system to the kilogram-level molten metal in the laboratory. If it is directly applied to industrial production, it will cause the power supply system of the factory to trip and fail to work.

Because the experimental equipment does not have a large enough energy storage and release device, although it can meet the needs of the laboratory to process several kilograms of molten metal, it cannot obtain ideal treatment effects in industrial production.

In addition, the difference of the energy waveform of the electric field also affects the effect of molten steel treatment. Unsuitable waveforms have a greater impact on the energy output into the molten steel. Some waveforms have high voltage, but the energy transmitted into the molten steel is very small. , can not achieve the effect of treatment in industrial production

At present, there is no successful experience in applying electric field energy to improve the quality of molten steel for silicon steel continuous casting slabs, especially for large-scale industrial production, so it is impossible to provide suitable electric field energy treatment parameters

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