Analytical method for component segregation of continuous casting slab

Abstract

The invention relates to an analytical method for the component segregation of a continuous casting slab, and belongs to the technical field of analysis of component segregation in steel industry. The segregation grade evaluation analytical method which is used currently has the defects of few analytical elements, uncontinuous sampling, high randomness of sampling points, no quantitation, inaccurate analytical results of the component segregation and the like. By utilizing a metal in-situ analysis meter, the invention provides an analytical method for performing continuous sampling and fine and quantitative analysis on a plurality of elements such as carbon, sulphur and the like and performing the component segregation of the continuous casting slab and capable of being displayed visually in a mode of images and texts. In the analytical method, the cross section of the continuous casting slab is taken as an analytical object, and the analytical method comprises steps of collecting samples, scanning the samples by utilizing the metal in-situ analysis meter, and displaying each scanning result by using diagrams. The analytical method has the advantages of expressing the segregation of the continuous casting slab quantitatively, having good repeatability, expressing the segregation characteristic and segregation law in the modes of points, lines and surfaces, obtaining multielement quantitative segregation results through one-time scanning results, having accurate results and a few analytical samples, and reducing the detection time and detection cost.

Description

technical field [0001] The invention belongs to the technical field of component segregation analysis in the iron and steel industry, in particular to a method for component segregation analysis of continuous casting slabs by using a metal in-situ analyzer. Background technique [0002] Composition segregation of continuous casting slab is a common internal quality defect, which is inevitable in the production process. When the segregation is serious, it will have an adverse effect on the uniformity of the mechanical properties of the steel. Traditional segregation detection methods include drilling sampling method, low magnification, etc. In recent years, image analysis method has been developed. The sampling points of the borehole sampling method are discontinuous, and the analysis results have poor repeatability and representativeness, and cannot clearly display the composition distribution in a large range. At present, the metallurgical recommendation standard YB / T4003...

AI Technical Summary

Problems solved by technology

The sampling points of the borehole sampling method are discontinuous, the analysis results are poor in repeatability, the representativeness is not strong, and the composition distribution in a large range cannot be clearly displayed

At present, the metallurgical recommendation standard YB / T4003-1997 "Continuous Casting Billet Defect Sulfur Impression Rating Chart" is used for segregation level assessment in production inspection. Its advantages are intuitive and easy to implement; the disadvantages are: 1. Only the rating results can be given, not quantitative , 2. Only carbon and sulfur elements can be analyzed, and other elements cannot be analyzed. 3. The effect on severe segregation is better, and the effect on general segregation is poor

The image analysis method uses metallographic image analysis combined with thermodynamic calculations to obtain the macro-segregation method in the thickness direction of the slab, which can semi-quantitatively analyze the macro-segregation of carbon in the slab and the carbon content distribution in the thickness direction of the billet; the disadvantages are: 1. It can only analyze carbon Elements, other elements cannot be analyzed; 2. The result is semi-quantitative and cannot be accurately quantified; 3. The test result is a micro-field of view under high magnification, and the test results are not strictly continuous; 4. It can be used for the analysis of small cross-section samples. For large samples such as slabs, the analysis process is very time-consuming and complicated.

[0003] 1) There are few elements to be analyzed, at most only two elements, carbon and sulfur, can be analyzed, and other elements cannot be analyzed

2) The analysis sampling is discontinuous, the sampling point is random, and the macro-segregation characteristics on a large area of ​​the slab cannot be analyzed

3) The analysis results are not precise and quantitative; 4) The distribution state of segregation cannot be accurately or comprehensively reflected

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