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A method for controlling slag line erosion of immersed nozzles by using an external electric field

An applied electric field, immersion technology, applied in manufacturing tools, metal processing equipment, casting melt containers, etc., can solve the problems of single casting conditions and limited improvement effect, and achieve strong universality, single casting time increase, The effect of simple process operation method

Active Publication Date: 2022-07-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can alleviate the erosion rate of the slag line at the nozzle to a certain extent, the applicable casting conditions are relatively single, and the actual improvement effect is very limited

Method used

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  • A method for controlling slag line erosion of immersed nozzles by using an external electric field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This example takes a double-flow ultra-low carbon slab continuous casting as the object. During the experiment, the first nozzle was cast normally as the control group, and the other nozzle was cast by the method of external electric field control as the experimental group. For the experimental group, before casting, the outside of the nozzle should be grooved in advance, and the high-temperature metal wire should be evenly wound inside the groove. The slotting position is 40cm above the slag line of the submerged nozzle, the slot width is 1.5cm, and the slot depth is 1.3cm. The selected high-temperature metal wire is molybdenum with a high melting point, and the diameter of the wire is 1.5mm. After that, the used graphite rod is slotted, and then the high-temperature metal wire is evenly wound inside the slot. The diameter of the graphite rod is 5cm, and the length of the graphite rod is 1.4m. The slotting position is 3 cm from the top of the graphite rod, the slot w...

Embodiment 2

[0045] This example still takes a double-flow ultra-low carbon slab continuous casting described in Example 1 as the object. During the experiment, the two-flow nozzles were cast by the method of external electric field control as the experimental group. A comparative experiment was carried out with the comparative flow without electric field applied in Example 1. During the casting process, all the operation processes remained unchanged, except that the casting time in the original continuous casting process was increased from 6.5 hours to 8.5 hours.

[0046] During the casting process, compared with the normal casting nozzle and its surrounding liquid surface, the liquid level near the nozzle controlled by the electric field is still very stable, and there is no obvious fluctuation. After the casting is completed, the change of the slag line of the two nozzles is still not obvious. After the nozzle is cut open, it is found that the inside of the slag line of the nozzle remain...

Embodiment 3

[0048] In this example, the low-carbon steel billet continuous casting of one machine and eight streams in a steel plant is used as the experimental object. During the experiment, the second nozzle adopts normal casting as the control group, and the seventh nozzle at the other end adopts an external electric field. Casting was performed in a controlled manner as the experimental group. For the experimental group, the outside of the nozzle should be grooved before casting, and the high-temperature metal wire should be evenly wound inside the groove. The slotting position is 35cm above the slag line of the submerged nozzle, the slot width is 1.5cm, and the slot depth is 1.5cm. The selected high-temperature metal wire is molybdenum with a high melting point, and the diameter of the wire is 1.0mm. After that, the used graphite rod is slotted, and then the high-temperature metal wire is evenly wound inside the slot. The diameter of the graphite rod is 5cm, and the length of the g...

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Abstract

The invention relates to the field of continuous casting, in particular to a method for controlling the erosion of immersed nozzle slag lines by using an externally applied electric field, which specifically comprises the following steps: slotting the nozzle and burying the wire, slotting the graphite rod for wiring, installing the graphite rod with a lifting device and fixing it Above the mold, build electric field loops and apply electric fields to control slag line erosion. The method can effectively protect the material of the submerged nozzle slag line, delay the erosion rate of the submerged nozzle slag line, and greatly improve the continuous pouring time and work efficiency.

Description

technical field [0001] The invention relates to the field of continuous casting, in particular to a method for controlling slag line erosion of an immersed nozzle by using an external electric field. Background technique [0002] As a high-efficiency and low-cost metallurgical technology, continuous casting has been widely used in the smelting and production of most steel grades. And with the continuous progress and improvement of continuous casting technology, the production quality and continuous casting speed of continuous casting billets have been significantly improved. [0003] In the process of continuous casting, the submerged nozzle, as the key functional refractory material connecting the mold and the tundish, plays the role of guiding the flow of the molten steel and preventing the secondary oxidation of the molten steel. However, at the slag line outside the nozzle, due to the alternating contact and interaction of molten slag and molten steel at the nozzle, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/50B22D11/16
CPCB22D41/505B22D11/16
Inventor 袁磊田晨李延刘朝阳温天朋颜正国于景坤
Owner NORTHEASTERN UNIV LIAONING
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