A method for eliminating centerline segregation of continuous casting slabs by using additive dilution

A continuous casting billet and centerline technology, applied in the field of continuous casting, can solve the problem of not putting forward implementation parameters, and achieve the effect of small deviation and good three-dimensionality

Active Publication Date: 2019-06-21
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic public reports (patents: CN200610044356.0, CN201210565960.3, CN201410799131.0) gave a general introduction to belt feeding equipment or technology, but did not propose specific implementation parameters

Method used

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  • A method for eliminating centerline segregation of continuous casting slabs by using additive dilution
  • A method for eliminating centerline segregation of continuous casting slabs by using additive dilution
  • A method for eliminating centerline segregation of continuous casting slabs by using additive dilution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] like figure 1 As shown, the casting liquid flows out from the nozzle 1, and the casting liquid flows into the mold. The sidewall of the crystallizer continuously cools the liquid phase cavity 3 , so that the side and bottom of the liquid phase cavity 3 are continuously crystallized to form a mushy zone 4 , and the mushy zone 4 continues to cool down to form a solidified shell 5 . The solidified shell 5 is pulled out from below. The liquid phase cavity 3, the mushy zone 4 and the solidified billet shell 5 continuously flow and evolve, forming a continuous casting billet as a whole. Under the premise that the conditions remain unchanged, the boundary between the liquid cavity 3 and the mushy region 4 and the boundary between the mushy region 4 and the solidified shell 5 are stably located at a certain position and stably maintain a certain shape.

[0048] The continuous casting slab in this embodiment is a low-carbon continuous casting thick slab, and the following meth...

Embodiment 2

[0065] As the calculation result of embodiment 1, choose C 选1 =0.11wt%>C a1 , C 选2 =0.26wt%>C a2 ,C 选3 =1.40wt%>C a3 ,C 选4 =0.0137wt%>C a4 ,C 选5 =0.0012wt%>C a5 , C 选6 =0.011wt%>C a6 , manufacturing additive. The ratio of elements is better controlled, the additive manufacturing is convenient, and the process is simpler. It can also greatly reduce the central segregation of the continuous casting billet and solve the central shrinkage porosity.

Embodiment 3

[0067] As in Example 1, the impurity concentration C is added to the input of the macro model 标7 , including C in the final output a7 , choose C 选7 a7 Manufacturing additive, the additive section is annular, the difference between the inner and outer radii of the annular is 3mm, and the annular area is equal to 30mm 2 , Additive manufacturing is convenient. During the process of feeding the additive, the additive body 2 is subjected to vibration with an amplitude of 2 mm and a vibration frequency of 500 Hz. It can further improve the central performance of the continuous casting slab and solve the central shrinkage.

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Abstract

The invention relates to a method for diluting and eliminating center line segregation of a continuous casting slab by utilizing an additive material. The method comprises the following steps: acquiring the parameters of production working conditions; determining supply speed va, the thickness d of the additive material and the width w of the additive material, wherein w is larger than d; calculating a segregation index of the tail end of a liquid core based on a standard solute concentration C<standard> to obtain a solute concentration Coi, and adopting an inverse method to obtain a solute concentration Ca of the additive material; obtaining a selection concentration C<selection> according to a formula that C<selection> is larger than or equal to Ca and smaller than C<standard>; selectingand / or manufacturing the additive material according to the thickness d of the additive material, the width w of the additive material and the selection concentration C<selection>, and continuously conveying the additive material to the tail end of the liquid core in a vibrating manner. According to the method for diluting and eliminating center line segregation of the continuous casting slab byutilizing the additive material provided by the invention, the center line segregation is alleviated and eliminated by utilizing proportioning of alloy components, and meanwhile the additive materialcan eliminate center loosening. The additive material is completely molten after reaching the tail end of the liquid core; under a vibration effect, the molten liquid group is totally mixed with casting liquid inside the tail end of the liquid core, so two great internal quality defects about center line segregation and center loosening inside the continuous casting slab are simultaneously prevented.

Description

technical field [0001] The invention relates to the field of continuous casting, in particular to a method for eliminating central line segregation of continuous casting slabs by using additive dilution. Background technique [0002] The central segregation of the continuous casting slab is accompanied by the porosity of the center, and the presence of internal inclusions will seriously deteriorate the performance of the slab. Pouring with high superheat is conducive to the floating of inclusions, but it will increase the degree of central segregation. Minimizing the degree of central segregation is very important to further improve the quality of the slab. [0003] In the conventional continuous casting production process, the methods that can reduce the center segregation have been adopted so far: electromagnetic stirring at the end of solidification and light reduction, etc. However, these measures have some disadvantages. It is difficult to accurately determine the pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/108B22D11/112B22D11/114B22D11/18
CPCB22D11/108B22D11/112B22D11/114B22D11/18
Inventor 李宝宽牛冉刘中秋卜立夫李向龙
Owner NORTHEASTERN UNIV LIAONING
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