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Method for quantitative analysis of continuous casting sheet billet gross segregation by image analysis method

An image analysis and quantitative analysis technology, applied in the field of metallurgy, can solve problems such as the adverse effects of the welding performance and corrosion resistance of steel plates, the uniformity of mechanical properties of steel plates, and the delamination of steel plates.

Active Publication Date: 2010-09-22
SHOUGANG CORPORATION
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Problems solved by technology

[0002] The central segregation of the slab is inseparable from the quality defects of the finished product. It not only affects the uniformity of the mechanical properties of the steel plate, has an adverse effect on the welding performance and corrosion resistance of the steel plate, but also causes quality defects such as delamination of the steel plate.

Method used

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  • Method for quantitative analysis of continuous casting sheet billet gross segregation by image analysis method
  • Method for quantitative analysis of continuous casting sheet billet gross segregation by image analysis method
  • Method for quantitative analysis of continuous casting sheet billet gross segregation by image analysis method

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Embodiment

[0029] The slab used in the analysis is ship slab, and its composition is shown in Table 1.

[0030] Table 1 Chemical composition of test slabs (tundish analysis)%

[0031]

[0032] At 1 / 4 of the width of the slab, cut 5 samples of 11mm×11mm×10mm along the length direction at 5 positions 20, 55mm from the upper and lower surfaces and the thickness center, and obtain 2 groups of 10 samples along the length direction. samples, and each set of samples includes the above 5 positions.

[0033] The samples were etched with 2% nitric acid alcohol solution after inlaying and polishing. For each sample, 7 columns of observation areas are randomly selected along the width direction of 11mm, and the magnification of X100 is used, and the calculation and analysis of 30 continuous areas are carried out in each column along the thickness direction (the length and width of each analysis area are less than 1mm ). The tissue change in each thickness direction adopts the average value cor...

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Abstract

The invention discloses a gross segregation quantitative analyzing method of a continuous casting sheet billet that adopts an image analyzing method, which belongs to the technical field of metallurgical analysis, and comprises the following steps: the structural content change of the sheet billet in the thickness direction is obtained through metalloid image analysis, the structural volume percent is converted into the mole percent through crystal lattice volume computation, a binary phase diagram of the carbon weight percent and the austenite structure mole percent is obtained through thermodynamic computation, and the structural mole percent in each analyzed region is converted into the carbon weight percent. The gross segregation quantitative analyzing method has the advantages that the analyzing method that combines the metalloid structure image analysis method with the thermodynamic computation is adopted for analyzing the gross segregation of the sheet billet, thus quantitatively analyzing the carbon gross segregation in the sheet billet, more precisely observing and analyzing the carbon content distribution in the sheet billet, and consequently providing a novel tool for examining and analyzing the gross segregation of the sheet billet.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and mainly relates to a novel method for analyzing macroscopic carbon segregation of continuous casting slabs by using an image analysis method and a thermodynamic calculation method. Background technique [0002] The central segregation of the slab is inseparable from the quality defects of the finished product. It not only affects the uniformity of the mechanical properties of the steel plate, has an adverse effect on the welding performance and corrosion resistance of the steel plate, but also causes quality defects such as delamination of the steel plate. There have been many studies on the mechanism and principle of slab center segregation, and there are many methods for evaluating the degree of segregation. The most commonly used ones are low-magnification inspection using sulfur printing to evaluate the level of center segregation and drilling samples with drill bits or along the In rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88
Inventor 金茹赵焕春杨铁城
Owner SHOUGANG CORPORATION
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