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Casting blank liquid core length measuring method

A determination method and liquid-phase hole technology are applied in the field of iron and steel continuous casting, which can solve problems such as inability to detect, and achieve the effects of easy operation, favorable promotion and application, and low cost.

Inactive Publication Date: 2009-02-18
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mostly adopts the nail-shooting method for the determination of the length of the liquid-phase cavity in the existing slab, and the obtained value is a calculated value, and it cannot determine the longitudinal section shape of the liquid-phase cavity and the transverse direction of the liquid-phase cavity on the corresponding slab length. The shortcoming of detecting the cross-sectional shape, the present invention provides a method for measuring the length of the liquid phase cavity of the casting slab, the length of the liquid phase cavity of the casting slab obtained by this method is the measured value, and the longitudinal section shape and shape of the liquid phase cavity can be detected. The cross-sectional shape of the liquid phase pocket along the length of the corresponding strand

Method used

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  • Casting blank liquid core length measuring method
  • Casting blank liquid core length measuring method
  • Casting blank liquid core length measuring method

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Experimental program
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Effect test

Embodiment 1

[0026] The composition of molten steel is (wt%):

[0027] C Si mn S P Ca [Al]s 0.75 0.21 0.62 0.01 0.009 0.0004 0.0006

[0028] The rest is iron and unavoidable impurities.

[0029] The above-mentioned molten steel flows into the crystallizer from the tundish, and in the mold, the molten steel is gradually condensed along the wall of the crystallizer cooled by water around it to form a primary billet shell, and then the shell that is initially condensed in the crystallizer passes through the secondary cooling section and solidifies while being cooled. And pull out at a speed of 1.4m / min. At the end of continuous casting, when the molten steel in the tundish stops pouring, a certain amount of lead tracer is added into the crystallizer. The billet is billet.

[0030] Then the billet is inspected. If the problem of difficult operation is not considered, the profile of the billet after longitudinal section along the center line is as follows f...

Embodiment 2

[0034] The composition of molten steel is: (wt%):

[0035] C Si mn S P Cu [Al]s 0.143 0.222 0.499 0.015 0.012 0.033 0.0014

[0036] The rest is iron and unavoidable impurities.

[0037] The above-mentioned molten steel flows into the crystallizer from the tundish, and in the mold, the molten steel is gradually condensed along the wall of the crystallizer cooled by water around it to form a primary billet shell, and then the shell that is initially condensed in the crystallizer passes through the secondary cooling section and solidifies while being cooled. And pull out at a speed of 1.3m / min. At the end of continuous casting, when the molten steel in the tundish stops pouring, a certain amount of lead tracer is added into the crystallizer. The blank is a slab.

[0038] The detection method of this embodiment is to cut a billet sample of a certain length, and cut the billet longitudinally along the central line of the casting billet.

[0039]...

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Abstract

The invention discloses a method for measuring the length of a liquid core of a casting blank, which belongs to the technical field of steel continuous casting. The method comprises the following steps: during the continuous casting, a tracer is added in the liquid core in the center of the continuous casting blank and flows to the tail end of the liquid core, when the continuous casting blank is cooled down and solidified, the tracer is sampled and is subjected to split detection. The method for measuring the length of the liquid core of the casting blank, which replaces the prior bolt striking method, can accurately and directly find the liquid core position of the casting blank; and by utilizing the method, the actual solidifying condition of the casting machine can be better shown, and the cross sectional shape of the liquid core and the cross sectional diameter of the liquid core with the corresponding casting blank length can be measured. The measurement method of the invention has the advantages of simpleness, accuracy, easy operation, low cost, fast result derivation and convenient popularization and application.

Description

technical field [0001] The invention belongs to the technical field of iron and steel continuous casting. Background technique [0002] During the continuous casting process, molten steel from the tundish flows into the mold, and in the mold, the molten steel is gradually condensed into the primary billet shell along the wall of the crystallizer that is cooled by water around it, and then the shell that is initially condensed in the mold passes through the secondary cooling section Solidify while cooling, and pull out at a certain speed. [0003] Due to the comprehensive effect of the flow state of molten steel and the temperature gradient between the solidification front and the surface of the continuous casting slab, a "V"-shaped liquid phase cavity is formed in the center of the continuous casting slab, and the solid and liquid two-phase regions of the liquid phase cavity are in the continuous casting During the descending process, the billet is further cooled and gradua...

Claims

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Application Information

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IPC IPC(8): B22D2/00G01B15/04G01B15/00
Inventor 高文芳易卫东张剑君赵继宇王光进潘艳华王金平吴福生张康兴周运武
Owner WUHAN IRON & STEEL (GROUP) CORP
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