Method of applying electric field energy to treat molten steel

Abstract

The present invention provides method of applying electric field energy to treat molten steel. One electric field energy generator is used to introduce electric field energy into molten steel via electric poles, and the electric field energy is in square wave of variable duty ratio and has energy of 1000J-200MJ, voltage of 100V-2000V, current 100A-10KA, frequency not higher than 25 Hz, and duty ratio of 5-95 %. The electric field energy generator is suitable for industrial production and has properly adjusted parameters. The treated molten steel has changed solidification process and fine solidified structure, and the solidified material has globular crystal structure and isometric branch structure, less macro segregation and other faults, raised physical and mechanical performance.

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 for refining the metal solidification structure. Background technique [0002] In recent years, the research on the solidification of metals under the action of an electric field has attracted much attention. Under the condition that the metal is in a completely liquid state, the electric field energy is applied to it to change the structure of the liquid metal. Under a certain degree of superheat and appropriate electric field treatment parameters, the solidified structure of the metal can be significantly improved and refined. At present, most of this technology is still in the experimental stage, and some low-temperature alloy tests are mostly done in the laboratory. The energy of experimental equipment in some laboratories is too small to be suitable for the harsh environment of industr...

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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

The effect on the liquid metal solidification structure is the effect of the electric field energy output into the molten metal. 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 applied to industrial production, it will Tripping the power supply system of the plant and making it inoperable

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 the ideal treatment effect in the application of industrial production.

Therefore, in the face of various conditions of industrial production, it is difficult to select suitable processing parameters with existing experimental equipment, and it is impossible to accurately and effectively process and control the metal solidification process.

In addition, the different energy waveforms of the electric field also affect the effect of processing molten steel. Unsuitable waveforms have a greater impact on the energy output into molten steel. Although some waveforms have high voltage, the energy transmitted into molten steel is low. Very small, can not achieve the effect of treatment in industrial production

Due to the above reasons, this technology has not been directly applied to large-scale industrial production, so it cannot provide suitable electric field energy processing parameters

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