A method for predicting macro-segregation of continuous casting slabs

Abstract

The invention discloses a macrosegregation prediction method of a continuous casting slab. The method is characterized by including the following steps: step 1, establishing a macrosegregation model of continuous casting solidification to obtain solute concentration distribution and temperature distribution situations which are in the continuous casting slab and of not considering inclusion precipitation; step 2, introducing an inclusion precipitation calculation model to calculate and acquire an inclusion precipitation distribution situation in the casting slab, solute consumption amounts ofinclusion precipitation and the like according to an inclusion precipitation thermodynamics theory and a solute mass conservation law, and step 3, recalculating and correcting solute concentration distribution, which is calculated and obtained by the macrosegregation model of continuous casting, according to solute concentration after inclusion precipitation, and finally, predicting and acquiringsolute macrosegregation distribution which is in the continuous casting slab and of considering inclusion precipitation. The macrosegregation prediction method of the continuous casting slab of the invention has the advantages that costs are lower, efficiency is higher, and a solute macrosegregation distribution situation in the continuous casting slab can be more accurately predicted. A prediction result can be used for optimizing continuous casting technology and improving quality of the continuous casting slab.

Description

technical field [0001] The invention belongs to the field of continuous casting solidification forming control methods for iron and steel materials, and in particular relates to a continuous casting slab macro segregation prediction method. Background technique [0002] The continuous casting slab is the initial steel product obtained after the molten steel smelted in the steelmaking furnace is cast by the continuous casting machine. [0003] Segregation is the phenomenon that after the solidification of liquid alloy (molten steel) in the mold, there is an uneven chemical composition between various parts of the casting section and between grains and grain boundaries; segregation is an inherent feature of alloy solidification, and it is also a continuous casting process of molten steel. One of the important quality defects of casting slabs; it has a great influence on the life and performance of alloy products. There are three types of segregation: intragranular segregation...

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Problems solved by technology

[0006] In the above studies, the influence of inclusion precipitation on solute macro-segregation is generally carried out through experimental detection, and the cost of experimental detection and research on the interaction between inclusion precipitation and solute segregation is generally high, the efficiency is low, and it cannot be fully detailed. Obtain the distribution of solute and inclusions in the entire macroscopic section of the continuous casting slab during the continuous casting process

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