Method of applying two-frequency electromagnetic field to improve quality of continuous casting

A continuous casting billet and electromagnetic field technology, which is applied in the field of metal material processing, can solve the problems of mold slag entrainment and nozzle erosion, blocked mold slag channels, and deteriorated lubrication effect, so as to improve the initial solidification process and reduce the occurrence of surface cracks. The effect of improving the probability and liquid level stability

Inactive Publication Date: 2004-01-07
DALIAN UNIV OF TECH
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Problems solved by technology

Using this method can not only solve the current problems such as meniscus fluctuations caused by electromagnetic stirring in the crystallizer, blockage of mold slag passage, deterioration of lubrication effect, mold slag entrainment and nozzle erosion, but also eliminate vibration marks and cracks on the surface of the slab. Surface defects make the surface smooth, which is conducive to the further development of high-speed continuous casting technology and the smooth realization of the integration of continuous casting and rolling processes

Method used

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  • Method of applying two-frequency electromagnetic field to improve quality of continuous casting
  • Method of applying two-frequency electromagnetic field to improve quality of continuous casting

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Embodiment 1

[0016] A certain unit produces billets with a cross-section of 100×100mm. The material is high-quality carbon steel with a carbon content of 0.18%. The surface roughness of the slab is required to be less than 0.2. Less than 0.8 pieces / 100cm 2 , used for rolling wire. In the production process, the technical parameters selected by the present invention are: adopt copper electromagnetic crystallizer 2, its internal size is 100×100×400mm, and its external size is 146×146×400mm, along 4 sides at 20mm from the upper end surface of the crystallizer 20 equally spaced slots with a width of 0.4mm and a length of 280mm are opened longitudinally; a high-frequency coil 4 is set at a distance of 50mm from the top of the crystallizer 2, the number of turns is 5 turns, the internal size is 150×150×70mm, and the external size 174×174×70mm, high-frequency power supply frequency is 40kHZ; applied power is 45kw. The maximum value of the magnetic induction Bz in the crystallizer is 330G; a low...

Embodiment 2

[0018] A certain unit produces round slabs with a section of φ100mm, the material is low alloy steel, the surface roughness of the slab is required to be less than 0.25, the ratio of equiaxed grains in the slab is greater than 70%, and the number of inclusions is less than 1 / 100cm 2 , used as rolled pipe. In the production process, the selected technical parameters of the present invention are: adopt copper electromagnetic crystallizer 2, its internal dimension φ100×400m, external dimension φ144×400mm, and set 16 longitudinally along the circumferential side at the place 20mm away from the upper end surface of the crystallizer 2 Equally spaced gaps with a width of 0.4 mm and a length of 280 mm; a high-frequency coil 4 is set at a distance of 50 mm from the top of the crystallizer 2, with 4 turns, its internal size is 154×60 mm, and its external size is 176×60 mm. The frequency of the applied high-frequency power supply is 25kHz, the power is 40kw, and the maximum value of the ...

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Abstract

The method for improving quality of continuous casted billet by applying double-frequency electromagnetic field is characterized by that the upper portion and lower portion of outside of electromagnetic crystallizer are equipped with two induction coils in turn, its upper coil is connected with high-frequency current, and lower coil is connected with low-frequency current, in the casting process the liquid surface and central surface of upper coil are always retained at same level, and its error is less than plus or minus 5 mm. Its equaxed crystal rate is raised to 100% and its impurity content is reduced by 97%.

Description

technical field [0001] The invention belongs to the field of metal material processing, in particular to continuous casting technology. Background technique [0002] The continuous casting technology replaces the traditional mold casting method is a profound technological revolution in the metallurgical industry. It not only realizes the mechanization and automation of casting production, greatly improves production efficiency, but also reduces energy consumption and material waste, making billets The internal and external metallurgical quality has been greatly improved. In recent years, with the development of continuous casting production towards high speed, near net shape and direct rolling of slabs, higher requirements have been put forward for the quality of continuous casting slabs. [0003] Electromagnetic stirring technology (EMS) uses electromagnetic force to force the molten steel in the slab to flow, changing the flow, heat transfer and mass transfer conditions d...

Claims

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Application Information

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IPC IPC(8): B22D11/115
Inventor 李廷举金俊泽张志峰张兴国姚山曹志强郑贤淑
Owner DALIAN UNIV OF TECH
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