A dynamic control method for cored wire feeding and wire feeding process of steel continuous casting crystallizer
A continuous casting mold and dynamic control technology, which is applied in the field of iron and steel metallurgical continuous casting production, can solve problems such as large fluctuations in the liquid level of the mold, drifting melting speed of the mold, and deterioration of the internal quality of the billet, so as to achieve stable internal quality, Great undercooling, reduced center segregation and porosity
Active Publication Date: 2017-07-11
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
However, when the steel strip is fed, the liquid level of the crystallizer fluctuates greatly, and it is easy to drift in the crystallizer and the melting speed cannot be controlled
If the fused steel strip is still not melted after the slab is solidified, it will cause the discontinuity of the steel quality of the slab and deteriorate the internal quality of the slab
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[0052] The embodiments of the present invention will be described in detail in conjunction with the accompanying drawings.
[0053] The process of feeding the cored wire to the crystallizer is carried out on a continuous casting machine in a domestic steel factory, in which the effective height of the mold is 0.8m; the cross-sectional size of the billet after forming is 230mm×1500mm; the steel type of continuous casting in the embodiment is High-strength steel Q960, the liquidus temperature is 1518.6°C, the carbon content in the steel is 0.12%, and the alloying elements are titanium, molybdenum, and chromium;
[0054] A steel continuous casting crystallizer feeding cored wire, the composition and size are as follows:
[0055] Core-spun shell:
[0056] Low-carbon steel strips are used, wherein the composition of low-carbon steel is, by mass percentage, C: 0.1%, the rest is Fe, the liquidus temperature is 1520.5°C, and its thickness is 0.3mm;
[0057] The core of the cored wir...
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A steel continuous casting mold core-feeding wire and a dynamic control method for the wire-feeding process, belonging to the field of iron and steel metallurgical continuous casting production. The steel continuous casting mold core-feeding wire consists of an outer shell and an inner core, and adopts a steel continuous casting crystallizer. The steps of the dynamic control method for feeding cored wire during the wire feeding process include: (1) establishing a database of the optimal wire feeding speed of the crystallizer; (2) retrieving the optimal wire feeding speed of the wire feeding machine from the database; (3) Obtain the speed deviation value; (4) Determine whether the speed deviation δ is zero; (5) Dynamic control of wire feeding speed; During the continuous casting production process, the superheat of the molten steel and the casting speed of the casting machine are affected by the production rhythm, and the process parameters Changes all the time, this method can dynamically adjust the wire feeding speed in real time according to the continuous casting process parameters, promote the molten steel to reach a greater degree of supercooling, thereby increasing the nucleation of liquid phase cavity grains, refining the grain size, and improving the two-phase area. Feeding behavior achieves the purpose of reducing segregation and porosity in the center of the slab and stabilizing the internal quality of the slab.
Description
technical field [0001] The invention belongs to the field of iron and steel metallurgical continuous casting production, in particular to a dynamic control method for feeding a cored wire and a wire feeding process in a steel continuous casting crystallizer. Background technique [0002] In the process of steel continuous casting, the high-temperature molten steel is continuously cooled by the copper plate of the crystallizer and the water spray in the secondary cooling zone, the surface of the slab grows in the form of columnar crystals to form a shell of a certain thickness, and the temperature of the liquid phase cavity is continuously reduced , the molten steel nucleates under supercooling and grows in the form of equiaxed dendrites. During the growth of dendrites, due to the difference in solubility and diffusion behavior of solute elements in the solid phase and liquid phase, solute elements (carbon, phosphorus, sulfur, etc.) are continuously discharged from the solid ...
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IPC IPC(8): B22D11/11B22D11/16
CPCB22D11/11B22D11/16
Inventor 朱苗勇姜东滨罗森王卫领刘航
Owner NORTHEASTERN UNIV LIAONING