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

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 ...

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 means. In addition, there are many studies on the use of the two technologies alone, but the combination of the two The effect on the continuous casting bloom has not been reported

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