Submerged nozzle control method of bar strip continuous casting

Abstract

The invention discloses a control method of a thin-slab casting and submerged nozzle. Setting the eroding range of the nozzle, the nozzle carries out unidirectional movement after finishing a single adjusting slag. The invention has the advantages that erosion time of a solution plane to the nozzle is shortened and the erosion times of erosion positions and same positions is changed, thus prolonging the service life of the nozzle in a whole. Furthermore, the invention also improves the assurance coefficients of the nozzle when producing the light-gauge steel plates, such as a carbon steel plate, and greatly reduces perforation rate of the nozzle as well as improves the production efficiency.

Description

technical field [0001] The invention relates to a control method of a thin slab continuous casting submerged nozzle. Background technique [0002] In the CSP steel industry, when continuous casting is used to produce common steel and other types of steel, the structural diagram of the tundish steel is as follows figure 1 As shown, during casting, molten steel 6 is fed into the crystallizer 2 through the submerged nozzle 1, and the top of the crystallizer 2 is provided with a cover plate 3. During continuous casting, it is necessary to add slag-adjusting materials for multiple slag-adjusting treatments. On the surface of molten steel 6, mold slag covering surface 4 and dissolving surface 5 will be formed. Among them, the meniscus-shaped dissolving surface 5 has a relatively large corrosion on nozzle 1, which is likely to cause nozzle 1 perforation, which affects the normal process of casting. In a single slag adjustment cycle, the nozzle 1 stays at the preset position in th...

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Problems solved by technology

The opening position of the sprue is 20mm, after the slab passes through the shearing machine, it drops to less than 10mm, and then the position of nozzle 1 in the molten steel changes in the following order: 10mm→20mm→30mm→40mm→50mm→60mm→70mm→60mm→50mm→ 40mm→30mm→20mm→10mm, after a total of 13 slag adjustment cycles, the design life of 1# casting machine is 13×60=780min, and that of 2# casting machine is 13×50=650min; but due to the uneven erosion of the nozzle, different Steel types and mold slag have different effects on the life of the nozzle, and the nozzle has to undergo two erosions at the same position, and the time is at least 100 minutes. In actual production, the nozzle often cannot reach the aforementioned design life

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