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
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  • Claims
  • Application Information

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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-secti

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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

Examples

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Example Embodiment

[0025] Example 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 inevitable impurities.

[0029] The above-mentioned molten steel flows into the mold from the tundish. In the mold, the molten steel is gradually condensed into a primary green shell along the wall of the mould cooled with water around it. Then, the primary solidified shell of the mould is cooled and solidified in the secondary cooling section. And pull it out at a speed of 1.4m / min. At the end of continuous casting, a certain amount of lead tracer was added into the mold while the molten steel in the tundish was stopped. After the tracer fully penetrated to the end of the liquid cavity, the continuous casting billet was pulled out. The billet is a square billet.

[0030] The billet is then inspected. If the problem of difficult operation is not considered, the cross-sectional view o...

Example Embodiment

[0033] Example 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 inevitable impurities.

[0037] The above-mentioned molten steel flows into the mold from the tundish. In the mold, the molten steel is gradually condensed into a primary green shell along the wall of the mould cooled with water around it. Then, the primary solidified shell of the mould is cooled and solidified in the secondary cooling section. And pull it out at a speed of 1.3m / min. At the end of continuous casting, a certain amount of lead tracer was added into the mold while the molten steel in the tundish was stopped. After the tracer fully penetrated to the end of the liquid cavity, the continuous casting billet was pulled out. The billet is a slab.

[0038] The detection method of this embodiment is to intercept a blank sample of a certain length, and cut the blank sample lo...

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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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