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Method for preventing liquid fluctuating of continuous casting peritectic steel crystallizer

A liquid level fluctuation and crystallizer technology, which is applied in the field of preventing liquid level fluctuations in continuous casting molds, can solve problems such as liquid level fluctuations, achieve the effects of eliminating liquid level fluctuations, facilitating popularization and application, and reducing casting slab quality defects

Inactive Publication Date: 2009-03-11
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Every time the weak shell passes through a pair of clamping rods in the sector, there will be a process of bulging and pressing back, thus causing periodic fluctuations in the liquid level

Method used

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  • Method for preventing liquid fluctuating of continuous casting peritectic steel crystallizer
  • Method for preventing liquid fluctuating of continuous casting peritectic steel crystallizer
  • Method for preventing liquid fluctuating of continuous casting peritectic steel crystallizer

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The inhomogeneity of the primary shell in the mold is the root cause of the fluctuation of the liquid level of peritectic steel. Therefore, ensuring the uniformity and stability of the primary shell of the mold is the key to solving the problem. Both theory and practice have proved that weak cooling and slow cooling of the crystallizer can effectively control the uneven growth of the shell.

[0033] The straight arc type casting machine is designed as a 900mm long straight plate mold, the water flow rate of the wide side is 3600l / min, and the temperature difference between the inlet and outlet water is about 5°C. The cooling intensity of the billet in the mold is obviously higher than that of the original full arc type casting machine. One of the reasons why the peritectic steel liquid level rarely fluctuates in the original full-arc casting machine. Therefore, by calculating and referring to the water volume of the 900-long full-arc caster mold, this embodiment provide...

Embodiment 2

[0041] The only difference between this embodiment and embodiment 1 is that the specific composition of the peritectic steel mold flux is (wt%): SiO 2 : 25.25, Fe 2 o 3 : 1.07, CaO: 35.06, Al 2 o 3 : 2.18, MgO: 3.23, C: 3.18, H 2 O: 0.15,K 2 O: 0.55, Na 2 O: 8.82, F: 6.92, R: 1.17, and the rest are impurities. After testing, the melting point of mold flux with this composition is 1145°C, and the viscosity (Pa.s) is 0.158.

[0042] A large number of experiments have proved that the proportion of mold flux in this embodiment can completely eliminate liquid level fluctuations during casting of peritectic steel.

Embodiment 3

[0044] The only difference between this embodiment and embodiment 1 is that the specific composition of the peritectic steel mold flux is (wt%): SiO 2 : 33.49, Fe 2 o 3 : 0.85, CaO: 38.5, Al 2 o 3 : 1.82, MgO: 3.48, C: 2.83, H 2 O: 0.42,K 2 O: 0.26, Na 2 O: 9.24, F: 6.53, R: 1.42, and the rest are impurities. After testing, the melting point of mold flux with this composition is 1132°C, and the viscosity (Pa.s) is 0.168.

[0045] A large number of experiments have proved that the proportion of mold flux can completely eliminate the phenomenon of liquid level fluctuation when casting peritectic steel.

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Abstract

The present invention is method of preventing liquid surface fluctuation in the peritectic steel crystallizer for continuous casting, and belongs to the field of continuous casting technology. The method includes controlling the flow rate of cooling water, controlling the pressure of the last driving roll in the straightening section and adopting peritectic steel protecting slag of new formula. The present invention can eliminate liquid surface fluctuation in the peritectic steel crystallizer and reduce the cracking rate of peritectic steel casting blank greatly.

Description

technical field [0001] The invention relates to a method for preventing liquid level fluctuations in a continuous casting crystallizer, in particular to a method for preventing liquid level fluctuations in a crystallizer when a straight-arc continuous casting machine casts peritectic steel, and belongs to the technical field of continuous casting. Background technique [0002] When the straight arc casting machine casts the peritectic steel series with [C] around 0.12%, the liquid level of the crystallizer fluctuates from time to time, and the fluctuation range is more than ±30mm, which often leads to a large decrease in casting speed of the casting machine, which affects production safety and The production capacity and production organization of the casting machine have a great impact, and the surface quality of the slab is very poor, requiring manual flame cleaning in the later stage, and it will be rejected directly in severe cases. Through statistics, it is found that t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18B22D11/11
Inventor 吴强宋泽启陈清泉张友华谢旭东
Owner 武钢集团有限公司
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