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

An in-situ analysis and casting slab technology, which is applied in the field of accurately judging the boundary between the solid phase area of ​​the continuous casting slab and the area of ​​different liquid phase ratios in the two-phase area, can solve the problems of difficult quantitative analysis, difficulty in obtaining the boundary of the slab, and high cost question

Active Publication Date: 2017-05-31
UNIV OF SCI & TECH BEIJING
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  • Description
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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

Method used

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

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Embodiment 1

[0028] The technical scheme of the invention is adopted to analyze a certain slab CSG610 steel sample. figure 1 It is a schematic diagram of the position of the in-situ sample and the scanning area in the low-magnification sample, where the size of the low-magnification sample is A1×B1; the size of the in-situ sample is A2×B2; the OPA scanning area is A3×B3; the central circle The inside of the dotted line is the melting part of the nail. Firstly, nailing is performed at the center of the billet width at a distance of 18.0 m from the mold meniscus. The thickness of the billet is 250 mm, the length of the nail body is 140 mm, and the diameter of the nail body is 5 mm. Cut the nail sample from the slab, and the center axis of the nail body basically coincides with the center axis of the low-magnification sample. Use a planer to machine the nailed sample, expose the central axis of the nail body and then polish it to make a low-magnification sample and pickle it to obtain a l...

Embodiment 2

[0031] Adopting the technical solution of the present invention, a 150 mm×150 mm billet 20Cr steel sample is analyzed. Firstly, the nail is shot at the center of the billet width 10.3 m away from the meniscus of the crystallizer, the length of the nail body is 120 mm, and the diameter of the nail body is 5 mm. Cut the nail sample from the slab, and the center axis of the nail body basically coincides with the center axis of the low-magnification sample. Use a lathe to machine the nailed sample, expose the central axis of the nail body and polish it, make and process low-magnification samples with length, width, and thickness of 150 mm, 150 mm, and 25 mm, respectively, and pickle. Get a low magnification photo. Then the low-magnification sample was further processed into an in-situ analysis block sample of 120 mm×90 mm×25 mm. After removing the oil stains on the surface, the nailing surface of the sample was polished with 6# sandpaper to make the surface smooth and clean with ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/06G01N21/84
Inventor 包燕平彭尊岳峰冯美兰王敏赵丽华林路张立强王睿李怡宏张超杰张乐辰
Owner UNIV OF SCI & TECH BEIJING
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