A system and method for predicting the thickness of the initial solidified billet shell in a steel continuous casting crystallizer

Abstract

A system and method for predicting the initial solidification shell thickness in a steel continuous casting mold. The system includes an information collection module, a steel type thermophysical parameter calculation module, a crystallizer initial solidification shell growth prediction module and a result output module; the method Including: detection of the microscopic solidification structure of the billet shell; collecting initial information: calculating the solute segregation and solidification path between dendrites during the solidification process of the molten steel to obtain the thermal physical parameters of the steel; solving the molten steel flow field and crystallizer temperature field of the mold and the solute field of the crystallizer, and coupled the macroscopic transport process in the crystallizer with the evolution behavior of the microscopic solidification structure in the crystallizer to further predict the shell growth behavior during the solidification process of high-temperature molten steel inside the continuous casting mold; the predicted solidification in the crystallizer The structure morphology and the thickness of the initially solidified shell at different positions in the crystallizer are output and displayed, as well as the comparison results with the actual thickness of the initially solidified shell. The invention can accurately predict the microscopic solidification behavior of the initial solidification shell in the crystallizer.

Description

technical field

[0001] The invention belongs to the technical field of metallurgical process production, and in particular relates to a prediction system and method for the thickness of an initial solidification slab shell in a steel continuous casting crystallizer. Background technique

[0002] As the most critical component in the continuous casting machine, the continuous casting mold is called the "heart" of the continuous casting machine. The high-temperature molten steel flows into the crystallizer through the submerged nozzle, and under the action of the crystallizer cooling water, a primary solidified shell of a certain shape is formed. The uniformity of the primary solidified slab shell in the crystallizer plays a decisive role in the surface quality of the continuous casting slab and the continuous casting castability, and the thickness of the solidified slab shell is related to the strength of the slab. It is very important to prevent breakout. For this reason, ...

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