Core-covered wire fed by steel continuous casting crystallizer and method for dynamically controlling wire feeding process

Abstract

The invention discloses a core-covered wire fed by a steel continuous casting crystallizer and a method for dynamically controlling a wire feeding process, and belongs to the field of iron and steel metallurgy continuous casting production. The core-covered wire fed by the steel continuous casting crystallizer consists of an outer shell and an inner core. The method for dynamically controlling the core-covered wire fed by the steel continuous casting crystallizer comprises the following steps: (1) establishing a database of the optimal wire feeding speed of the crystallizer; (2) retrieving the optimal wire feeding speed of a wire feeder from a database; (3) obtaining a speed deviation value; (4) judging whether the speed deviation value delta is zero or not; (5) dynamically controlling the wire feeding speed. During a continuous casting production process, the superheat degree of molten steel and the casting speed of a casting machine are affected by the rhythm of production, and process parameters change time after time; according to the method, the wire feeding speed can be adjusted dynamically in real time according to the continuous casting process parameters, so that the molten steel can be promoted to achieve great supercooling degree to increase liquid phase core grain nucleation, refine crystal grain size, and improve a feeding behaviour of a two-phase area; therefore, the purposes of reducing centre segregation and loosening of a casting blank and stabilizing the internal quality of the casting blank are achieved.

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 ...

AI Technical Summary

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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