Evaluation method of composition segregation of low-carbon high-manganese steel continuous casting small square billet

A component segregation and billet technology, which is applied to the analysis of materials, material analysis using wave/particle radiation, and measurement devices, can solve the problems of inability to accurately quantify the degree of component segregation of continuous casting slabs, and achieve stable results and simple operation , the effect of a large amount of data

Inactive Publication Date: 2013-09-25
SHOUGANG CORPORATION
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  • Application Information

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Problems solved by technology

The Journal of Metallology "Research on the Micro-segregation Model of Continuous Casting Slab" conducted a model study on the micro-segregation in the continuous casting slab, and can calculate the influence of steel C, Mn, P and other elements on the micro-segregation between dendrites at the solidification front, but cannot accurately Quantitative degree of composition segregation in actual continuous casting slabs

Method used

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  • Evaluation method of composition segregation of low-carbon high-manganese steel continuous casting small square billet
  • Evaluation method of composition segregation of low-carbon high-manganese steel continuous casting small square billet
  • Evaluation method of composition segregation of low-carbon high-manganese steel continuous casting small square billet

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Embodiment

[0020] 160mm for low carbon and high manganese steel 2 The alloy welding wire continuous casting billet is analyzed, and the samples are divided into three groups: Group1, Group2 and Group3, of which Group2 is the sample of Group1 after simulating the billet heating furnace process on the rolling site, and the heating process is: 15℃ / min to 650°C; 10°C / min to 1100°C; post-holding for 36min, quenching and air cooling. The composition of the corresponding slab is shown in Table 1, and the continuous casting process is shown in Table 2. sampling methods such as figure 1 shown, at a position 35mm away from the edge of the slab (such as figure 1 ), select 3 to 4 fields of view for analysis.

[0021] Table 1 Chemical composition of samples

[0022] Numbering

C

Si

Mn

P

S

Ti

Alt

Als

Group1

0.077

0.87

1.46

0.014

0.014

0.004

0.008

0.007

Group3

0.077

0.86

1.46

0.01

0.013

0....

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Abstract

The invention discloses an evaluation method of composition segregation of low-carbon high-manganese steel continuous casting small square billet and belongs to the technical field of continuous casting billet detection. Segregation characteristics are analyzed by utilizing the characteristic that an Mn element in the low-carbon high-manganese steel continuous casting small square billet is easy to form interdendritic enrichment and segregation, and the composition segregation of the continuous casting billet is quantitatively evaluated by utilizing an electron probe. The evaluation method comprises the specific steps of: determining the Mn element as an analysis object, scanning a casting billet sample by utilizing the electron probe to obtain a composition distribution diagram of the Mn element, carrying out line scanning on the composition diagram to extract Mn content data, carrying out deviation analysis on the obtained Mn content data, and comparing and evaluating the segregation degree of the continuous casting small square billet by calculating the size of standard deviation. The evaluation method can be used for expressing the composition segregation of the casting billet by using a curve and quantitatively evaluating the composition segregation by using the standard deviation, and has the advantages that the sample preparation is easy, the results are accurate, and the detection time and cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of continuous casting billet detection, and in particular relates to a method for evaluating the composition segregation of the continuous casting billet of a low-carbon and high-manganese steel. Quantitative and trending detection of cast slab composition segregation in iron and steel enterprises. Background technique [0002] Continuous casting billet segregation is an inherent characteristic of molten steel during solidification. Usually, the solubility of solute elements in liquids is higher than that in solids, so the solutes tend to leave the solidified phase and be pushed into the liquid at the solidification front. Compositional segregation. The segregation of the billet will affect subsequent processing and final product properties. In the continuous casting billet of low-carbon and high-manganese steel, local bainite or even martensite is formed in the rolled wire rod due to the segregation of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/225
Inventor 孙齐松佟倩陈涛严春莲王立峰鞠新华刘珂马跃罗志俊吕迺冰
Owner SHOUGANG CORPORATION
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