Method for quantitatively analyzing segregation of sheet material

Abstract

The invention discloses a method for quantitatively analyzing the segregation of a sheet material. The segregation degrees of easily segregated elements of a sheet material sample are studied to obtain an accurate and reliable method to evaluate the segregation degree of the steel plate. With a segregation index, the segregation degrees of elements in the steel plate are evaluated; and specific elements causing the segregation can be accurately determined and the segregation degrees of elements can be calculated quantitatively. Therefore, method has the important reference significance in steel type development and process improvement. The method is simple and is easy to implement and is protected from being affected by human factors. A problem that the detection result can only be evaluated qualitatively cannot be quantitatively in the prior art is solved. Moreover, the rapid optimization of the process for the steel plate production is realized; the production efficiency is improved;and lots of costs are saved for the companies.

Description

technical field [0001] The invention belongs to the technical field of steel detection and relates to a method for quantitatively analyzing steel plate segregation. Background technique [0002] Segregation is a common defect of casting slabs, which is difficult to eliminate during hot rolling and heating, and it is easy to cause serious defects such as banded structure, center segregation, center cracks, and inclusion accumulation exceeding the standard in the finished product. For microalloyed steels, such as microalloyed medium-thick steel plates for ship plates, bridges, containers, and marine facilities, in order to ensure toughness, Z-direction performance, and welding performance, central segregation must be strictly controlled. For pipeline steel plates used for oil and gas transportation, in order to ensure their low-temperature impact toughness, stress corrosion resistance, and HIC resistance, the central segregation of the slab must also be strictly controlled. I...

AI Technical Summary

Problems solved by technology

In the electron microscope analysis, it is often found that due to the severe center segregation, cracks are formed in the center of the steel plate after cooling and phase transformation, resulting in unqualified flaw detection and low impact toughness. , and the industry has never had a specific quantitative standard for the problem of segregation, to what extent will segregation cause quality problems

Because the test adopts the line scanning method, it cannot accurately characterize the segregation of the entire section

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