In-situ analysis method for accurate determination of billet shell thickness by nail shot

Abstract

The invention discloses an in-situ analysis method for accurately judging the thickness of a blank shell of a casting blank through a spanker bolt sample, and belongs to the technical field of continuous casting. The method includes the steps of machining the spanker bolt sample into an in-situ analysis sample of 50 mm-90 mm*80 mm-150 mm, conducting continuous spectrum scanning analysis, quantitatively and accurately judging the boundary between a continuous casting solid-phase area and an area where two phase areas have different liquid phase rates according to the change rule of the concentration of each element in the direction of a spanker bolt body, researching the flowing and diffusion conditions inside a solidified tail end of the casting blank, and analyzing the content distribution of each element and the density of a base body of each element, thereby obtaining the thickness of the blank shell of the casting blank at the designated position in the continuous casting secondary cooling process and the width of the area where the two phase areas have different liquid phase rates. According to the indexes, the advantages and disadvantages of process control technologies of the amount of water for cooling the casting blank, the casting speed, the electromagnetic stirring and the like can be clearly reflected, and the method has great significance in improving the quality of the casting blank and improving the technology. Thus, the method has the great reference and guidance significance in the continuous casting field.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and the invention provides a method for accurately judging the boundary between the solid phase region of a continuous casting slab and the regions with different liquid phase ratios in the two-phase region. Background technique [0002] The determination of the solid-liquid phase and the thickness of the two-phase region of the slab is one of the most important means to verify the correctness of the solidification heat transfer model of the slab. The working conditions of the continuous casting process are harsh, and it is difficult to effectively obtain the thickness data of the solid-liquid phase and the two-phase region of the slab during the continuous casting process through non-destructive testing. Most of the current detection methods are indirectly judged by the diffusion of steel elements, and there are also a few methods that directly measure the solid shell. [0003] The c...

AI Technical Summary

Problems solved by technology

[0006] The traditional billet shell thickness detection method is rarely used due to its high cost and difficulty in operation, while the most widely used analysis method of nail shooting + low magnification / sulfur print only relies on visual inspection and is difficult to quantitatively analyze, although it can be obtained more accurately The thickness of the shell in the solid phase, but it is difficult to obtain the boundary between the liquid phase and the two-phase region of the slab during solidification

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