Method for diluting and eliminating center line segregation of continuous casting slab by utilizing additive material

A technology of continuous casting slab and center line, which is applied in the field of continuous casting, can solve the problems such as the implementation parameters are not proposed, and achieve the effect of small deviation and good three-dimensionality

Active Publication Date: 2018-07-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Domestic public reports (patents: CN200610044356.0, CN201210565960.3, CN201410799131.0) gave a general...

Method used

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  • Method for diluting and eliminating center line segregation of continuous casting slab by utilizing additive material
  • Method for diluting and eliminating center line segregation of continuous casting slab by utilizing additive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 As shown, the casting liquid flows out from the nozzle 1, and the casting liquid flows into the crystallizer. The side wall 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 region 4, and the mushy region 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 region 4 and the solidified slab shell 5 continuously flow and evolve to form a continuous casting slab as a whole. Under the premise of constant conditions, the boundaries between the liquid-phase cavity 3 and the mushy region 4, and the boundaries between the mushy region 4 and the solidified shell 5 are stably in 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, select 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 additives. The element ratio 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 slab and solve the central shrinkage porosity.

Embodiment 3

[0067] As in Example 1, the impurity concentration C is added to the input of the macroscopic model 标7 , the final output includes C a7 , choose C 选7 a7 Manufacture additives, the cross-section of additives is circular, the difference between the inner and outer radius of the ring is 3mm, and the area of ​​the ring is equal to 30mm 2 , Additive manufacturing is convenient. During the process of feeding the additive, vibration with an amplitude of 2 mm and a vibration frequency of 500 Hz is applied to the additive body 2 . It can further improve the central performance of the continuous casting slab and solve the central shrinkage porosity.

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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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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
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