Method for promoting crystal growth of casting blank in crystallizer and crystallizer thereof

A technology to promote crystallization and crystal growth, which is applied in the field of molds for continuous steel casting, can solve problems affecting the casting speed of continuous casting machines, rhombic change, and the uniformity of crystal growth of the slab shell, so as to improve the crystal growth of the slab shell Uniformity, increase casting speed, and avoid shell shell cracks

Inactive Publication Date: 2019-09-06
常州市武进长虹结晶器有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If the molten steel stays in the crystallizer for a long time, it is beneficial to its crystallization, but it will affect the casting speed of the continuous casting machine
The current development direction is high-speed continuous casting, but in the case of high-speed casting, the uniformity of crystal growth of the slab shell is affected, and the slab is prone to rhomboid and square-off phenomena after being pulled out of the mold. Therefore, the current high-speed Continuous casting can only achieve a one-time pulling speed of 2.8 meters per minute

Method used

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  • Method for promoting crystal growth of casting blank in crystallizer and crystallizer thereof
  • Method for promoting crystal growth of casting blank in crystallizer and crystallizer thereof
  • Method for promoting crystal growth of casting blank in crystallizer and crystallizer thereof

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Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, an array type crystallizer comprises a crystallizer upper port 10 and a crystallizer lower port 30, and the crystallizer inner wall 90 between the crystallizer upper port 10 and the crystallizer lower port 30 is provided with several inner grooves 20. The inner groove 20 is located at the upper part of the crystallizer close to the upper port 10 of the crystallizer.

[0044] By adding an inner groove structure on the basis of the high-speed copper tube (high-speed crystallizer), the integration is optimized, so that the shell in this section grows more uniformly, and prevents cracks in the shell that are easily caused by excessive rapid cooling.

[0045] In continuous casting production, in order to maintain the passability of molten steel and its slab, prevent the molten steel from adhering to the inner wall of the crystallizer during the condensation process, reduce the friction resistance during casting, improve the surface quality of the s...

Embodiment 2

[0056] A method for promoting the growth of cast slab crystals in a crystallizer is to inject molten steel from the upper mouth of the mold, and the molten steel flows from the upper mouth of the crystallizer to the lower mouth, and undergoes three cooling steps of preliminary rapid cooling, slow cooling and shaping rapid cooling in sequence, and After forming the casting slab whose appearance is solidified slab shell and the inside is unsolidified molten steel, it is pulled out from the lower opening of the crystallizer; wherein,

[0057] The preliminary rapid cooling step is to preliminarily rapidly cool the injected molten steel to form a thin shell around the molten steel;

[0058] The slow cooling step is to slow down the solidification of the molten steel through slow cooling while continuing to form the billet shell;

[0059] The shaping quenching step is to continue to pull down the cast slab and cool the crystallized molten steel to solidify to form a slab shell of re...

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Abstract

The invention discloses a method for promoting crystal growth of a casting blank in a crystallizer. The method is characterized in that molten steel is injected from an upper opening of a crystallizer, the molten steel flows from the upper opening to a lower opening of the crystallizer, the molten steel is sequentially subjected to three-stage cooling steps of primary rapid cooling, slow cooling and setting rapid cooling, and form a casting blank with a solidified blank shell and internal unset molten steel, and then the casting blank is pulled out from the lower opening of the crystallizer; the primary quenching step comprises the following steps that primary rapid cooling is conducted the injected molten steel, and the molten steel is set to form the thin blank shell at the periphery ofthe molten steel; the slow cooling step comprises the following steps that solidification of the molten steel is slowed by slow cooling, and the blank shell is continuously formed; and the setting rapid cooling step comprises the following steps that the casting blank is continuously pulled downwards and the crystallized molten steel is cooled so as to be solidified to form the blank shell with the required thickness. The crystal growth uniformity of the blank shell is improved while the continuous casting and pulling speed is increased.

Description

technical field [0001] The invention relates to the field of crystallizers for continuous steel casting. Background technique [0002] The production process of continuously casting high-temperature molten steel into a billet with a certain cross-sectional shape and a certain size specification is called continuous steel casting. [0003] The crystallizer is a continuous casting equipment that accepts the injected molten steel and solidifies it into a solid slab shell according to the specified cross-sectional shape. It is the most critical part of the continuous casting machine. Ability plays a decisive role. The molten steel is rapidly cooled in the water-cooled crystallizer to form a cast slab whose appearance is a solidified slab shell and whose interior is unsolidified molten steel. The solidified billet shell at the outlet of the lower end of the crystallizer should have sufficient thickness to ensure that the internal molten steel does not flow out. As the pull rol...

Claims

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Application Information

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IPC IPC(8): B22D11/055B22D11/057
CPCB22D11/055B22D11/057
Inventor 吴纯辉
Owner 常州市武进长虹结晶器有限公司
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