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Anti-plugging tundish water supplying opening and manufacturing method thereof

An anti-clogging and nozzle technology, applied in the direction of manufacturing tools, casting equipment, casting melt containers, etc., can solve the problem of increasing the difficulty of continuous steel casting production process control, the difficulty of determining the argon flow index, and the excessive fluctuation of the crystallizer liquid level To avoid the instability of argon flow and back pressure, reduce the difficulty of installation and use, and eliminate deposition

Active Publication Date: 2013-07-10
UNIV OF SCI & TECH LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When the upper nozzle of the aluminum-zirconium carbon gas permeable tundish is in use, on the one hand, there is an air leak in the pipeline conveying argon or at the connection between the pipeline and the upper nozzle during installation; on the other hand, the outer wall of the upper nozzle is also a porous material, and part of the argon gas At the same time, it leaks from the outer wall of the nozzle. Two reasons cause the argon back pressure to become smaller, the effective argon flow rate on the inner wall of the upper nozzle is insufficient, and the upper nozzle of the air-permeable tundish may have a reduced anti-clogging function.
[0007] When the upper nozzle of the aluminum-zirconium carbon gas permeable tundish is in use, under different molten steel conditions, the flow index of the blown argon gas is not easy to determine, which increases the difficulty of process control in continuous steel casting production
If the flow rate of argon gas is too small, the upper nozzle of the tundish is easy to be blocked; if the flow rate of argon gas is too large, the steel liquid level in the mold will fluctuate too much, which will affect the metallurgical function of the mold

Method used

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  • Anti-plugging tundish water supplying opening and manufacturing method thereof
  • Anti-plugging tundish water supplying opening and manufacturing method thereof
  • Anti-plugging tundish water supplying opening and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] ① The zirconium-calcium carbon material used in the bowl 1 and the inner layer 2 is prepared according to the following weight ratio:

[0051]

[0052] ② The aluminum-zirconium carbon material used in the outer layer 3 is prepared according to the following weight ratio:

[0053]

[0054] ③ The aluminum-zirconium carbon material used in the bottom 4 is prepared according to the following weight ratio:

[0055]

[0056]

[0057] The manufacturing process of the above-mentioned anti-clogging tundish upper nozzle is as follows:

[0058] 1) Ingredients: Weigh all kinds of raw materials according to the ingredients list.

[0059] 2) Mixing: Put the prepared materials into a high-speed mixer, add liquid resin, mix well, and dry for later use.

[0060] 3) Molding: Add the mixed bottom 4 material, outer layer 3 material, inner layer material 2 and bowl 1 material into the combined mold according to the drawing requirements, and form it in an isostatic press. 130M...

Embodiment 2

[0068] ① The zirconium-calcium carbon material used in the bowl 1 and the inner layer 2 is prepared according to the following weight ratio:

[0069]

[0070] ② The aluminum-zirconium carbon material used in the outer layer 3 is prepared according to the following weight ratio:

[0071]

[0072] ③ The aluminum-zirconium carbon material used in the bottom 4 is prepared according to the following weight ratio:

[0073]

[0074] The manufacturing process of the above-mentioned anti-clogging tundish upper nozzle is the same as that of Example 1.

[0075] After testing, the physical performance indicators of the upper nozzle bowl of the anti-clogging tundish and the inner layer of zirconium-calcium carbon material are: porosity 13.2%, room temperature flexural strength 14.3Mpa, bulk density 3.05g / cm 3 ; The physical performance indicators of the outer layer of aluminum-zirconium carbon material are: porosity 9.5%, room temperature flexural strength 14.7Mpa, bulk density 2...

Embodiment 3

[0077] ① The zirconium-calcium carbon material used in the bowl 1 and the inner layer 2 is prepared according to the following weight ratio:

[0078]

[0079] ② The aluminum-zirconium carbon material used in the outer layer 3 is prepared according to the following weight ratio:

[0080]

[0081] ③ The aluminum-zirconium carbon material used in the bottom 4 is prepared according to the following mass ratio:

[0082]

[0083] The manufacturing process of the above-mentioned anti-clogging tundish upper nozzle is the same as that of Example 1.

[0084] After testing, the physical performance indicators of the upper nozzle bowl of the anti-clogging tundish and the inner layer of zirconium-calcium carbon material are: porosity 11.8%, room temperature flexural strength 12.5Mpa, bulk density 2.97g / cm 3 ; The physical performance indicators of the outer layer of aluminum-zirconium carbon material are: porosity 9.6%, room temperature flexural strength 13.7Mpa, bulk density 2.5...

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Abstract

The invention relates to an anti-plugging tundish water supplying opening and a manufacturing method thereof. The anti-plugging tundish water supplying opening is formed by compounding three parts, namely an inner layer, an outer layer and a bottom layer on a bowl part, wherein the inner layer is made of anti-plugging zirconium calcium and carbon materials; the outer layer and the bottom layer are made of aluminum zirconium and carbon materials with different components; the three materials are formed by pressing and compounding through an isostatic pressing machine; and slit type argon blowing gaps are not formed in the inner layer, the outer layer and the bowl part. In the tundish water supplying opening manufactured by the method, the effect of effectively preventing the inner wall of the water supplying opening from plugging can be achieved without blowing of argon in the using process; and the problems of complicated molding processes in the manufacturing process, plugging of theinner wall of the tundish water supplying opening due to unstable argon flow rates and back pressure in the using process and production safety accidents caused by penetration of molten steel into the argon blowing gaps due to high possibility of cracks of air-permeable materials on the inner wall of the air-permeable tundish water supplying opening in the process of manufacturing and using aluminum zirconium and carbon air-permeable tundish water supplying openings commonly used during continuous steel casting are solved.

Description

technical field [0001] The invention relates to a functional refractory material for steelmaking, in particular to an anti-clogging tundish upper nozzle used in the continuous casting production process of steel and a manufacturing method thereof. Background technique [0002] The tundish upper nozzle is an important part in the continuous steel casting production process, and it is installed at the bottom of the tundish. The bowl of the upper nozzle cooperates with the overall stopper of the tundish, and the flow of molten steel is controlled by moving the stopper up and down; the bottom of the upper nozzle is connected with the submerged nozzle. Controlled by the stopper rod, the molten steel flows from the tundish through the upper nozzle of the tundish and the submerged nozzle to the crystallizer in sequence. Whether the flowing steel channel is unobstructed directly affects the production of continuous casting steel. [0003] In the process of continuous steel casting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/10B22D41/50
Inventor 李波李轼保陈永范王仁贵李涛刘绍杰徐全胜徐占魁高玉明
Owner UNIV OF SCI & TECH LIAONING