Continuous casting bloom soft press technology based on tail end electromagnetic stirring

A terminal electromagnetic stirring and blooming technology, which is applied in the field of metal casting, can solve the problems that the effect has not been reported, and achieve the effects of convenient and effective control, increased service life, and uniform concentration of molten steel

Active Publication Date: 2013-05-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

For high-carbon steel blooms with strict internal quality requirements, the combination of end electric stirring and light reduction is definitely a very practical technical mea

Method used

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  • Continuous casting bloom soft press technology based on tail end electromagnetic stirring

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Effect test

Embodiment 1

[0017] The 425mm×320mm continuous casting bloom bearing steel in a steel plant is under the condition of no end electromagnetic stirring and light reduction, and the center segregation and porosity are quite serious when the casting speed is 0.65m / min. The bearing steel in this steel plant is continuously cast and lightly reduced when the casting speed is 0.65m / min, the total reduction is 17mm, and the reduction range is fs0.30-0.80. The liquid phase between the columnar crystals is not completely solidified, and the light reduction process At the same time as the straightening process, the slab cracked along the columnar grains, forming serious intermediate cracks, and the central shrinkage cavity was also clearly visible, and the internal quality was quite poor. In order to increase the equiaxed crystal ratio and suppress the occurrence of internal cracks, the terminal electromagnetic stirring device was installed in the air-cooled area 14.1m away from the meniscus. When the...

Embodiment 2

[0019] When the 350mm×470mm continuous casting bloom bearing steel of a steel plant is lightly reduced under the condition of casting speed 0.50m / min, due to the small total reduction of 9mm and no end electromagnetic stirring, the middle crack and central shrinkage cavity are very serious , seriously affecting the yield of rolled products. Under the condition of ensuring output and constant pulling speed, in order to suppress the occurrence of intermediate cracks and reduce the size of the central shrinkage cavity, the steel plant installed an end electromagnetic stirrer in the air-cooled area 14.5m away from the meniscus, and at the same time greatly Increased the total depression when lightly depressing. When the superheat of molten steel in the tundish is 20-30C, the casting speed is 0.50m / min, the terminal electromagnetic stirring current is 550A, the frequency is 6Hz, the total reduction is 20-22mm, and the reduction range fs=0.39-1.0, divide into three pouring times Mo...

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Abstract

The invention provides a continuous casting bloom soft press technology based on tail end electromagnetic stirring and belongs to the field of metal casting. The continuous casting bloom soft press technology based on the tail end electromagnetic stirring is characterized in that after a tail end electromagnetic stirring device is arranged on a second cooling area, a previous air cooling area is straightened. The thickness of a liquid core controlling the position of the stirring device occupies 30% to 55% of the thickness of a casting blank through a solidification heat transmission mathematical model. Stirring current of the tail end electromagnetic stirring device is 350A to 750A and stirring frequency is 3Hz to 8Hz. When soft press and straightening are conducted simultaneously, complete solidification of liquid phase among columnar crystals is guaranteed and meanwhile total press amount of a press intersection is controlled to be 10mm to 25mm, liquid steel superheat degree of a tundish is 20 DEG C to 30DEG C, dragging speed of a continuous casting machine is 0.35m/min to 0.75m/min, and therefore internal quality of a continuous casting bloom is remarkably improved and high quality rolled metal is guaranteed. Continuous casting bloom bearing steel manufactured through the technology is continuously manufactured for over 10 boilers, occurrence of internal cracks is avoided, a central organization is dense and even, the rate that a center contracting hole <=1.0 reaches 97.54%, center C segregation is controlled to be under 1.06 and thus the internal quality of the bearing steel is remarkably improved.

Description

technical field [0001] The invention belongs to the field of metal casting, in particular to a continuous casting bloom soft reduction process based on terminal electromagnetic stirring. Background technique [0002] With the continuous casting slab output and continuous casting ratio increasing year by year, the demand for steel has reached saturation, the market has already broken through the low-level demand in terms of quantity, and gradually transformed into a high-level demand for quality. Objectively, the iron and steel industry is required to It is necessary to change from the traditional emphasis on "production type" to "variety type" and "quality type". A batch of high-end products with high purity, high uniformity and ultra-fine grain have increasingly become the focus of research and development by iron and steel enterprises. [0003] Defects such as center segregation, center porosity and internal cracks are recognized as the most important quality problems in ...

Claims

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Application Information

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IPC IPC(8): B22D11/115B22D11/22B22D11/16
Inventor 张炯明肖超罗衍昭王顺玺宋炜李茂康赵新凯王博
Owner UNIV OF SCI & TECH BEIJING
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