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Method for removing slag inclusion of continuous casting tundish purging upper nozzle seating brick through argon blowing

A continuous casting tundish and tundish technology, which is applied in the direction of casting molten material containers, casting equipment, manufacturing tools, etc., can solve the problems of affecting the metallurgical effect of removing inclusions, the liquid level of molten steel is prone to fluctuations, and affecting the effect of inclusions, etc. To achieve the effect of highlighting the metallurgical effect, improving the effect, and slowing down the large fluctuation of the molten steel level

Active Publication Date: 2017-11-07
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing continuous casting tundish technology of blowing argon on the breathable upper nozzle block has the following problems or deficiencies: the molten steel level directly above the breathable upper nozzle block is prone to fluctuations, which makes the molten steel exposed and causes secondary oxidation of the molten steel, and the argon bubbles drive inclusions After the impurities floated to the molten steel surface in the tundish, they were not absorbed by the tundish slag in time, which affected the effect of removing inclusions
The disadvantage of this patented technology is that the molten steel level directly above the upper nozzle block of the breathable ceramic tube is prone to fluctuations, which makes the molten steel exposed and causes secondary oxidation of the molten steel, and the argon bubbles drive the inclusions to float to the molten steel level in the tundish without being Timely absorption of tundish slag affects the metallurgical effect of removing inclusions
The deficiency of this patented technology: the molten steel liquid level directly above the nozzle seat brick of the diffused breathable ring is prone to fluctuations, which makes the molten steel exposed to cause secondary oxidation of the molten steel, and the argon bubbles drive the inclusions to float to the liquid steel surface of the tundish. It is absorbed by the tundish slag in time, which affects the metallurgical effect of removing inclusions

Method used

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  • Method for removing slag inclusion of continuous casting tundish purging upper nozzle seating brick through argon blowing

Examples

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Effect test

Embodiment 1

[0026] Such as figure 1 , figure 2 As shown, a method for removing inclusions by blowing argon on the ventilating upper nozzle block of the continuous casting tundish includes the following steps:

[0027] 1) While the continuous casting ladle is being poured, argon gas is blown into the breathable upper nozzle block. The initial argon gas flow rate is 8L / min. When the molten steel in the tundish reaches the normal pouring molten steel level, increase the argon gas flow rate to 12L / min, the flow rate of argon is preferably controlled by the slight fluctuation of the molten steel level in the area directly above the vent block;

[0028] 2) The first furnace is poured in the tundish. After the molten steel surface in the tundish has overflowed the ladle nozzle, add 50kg of high-alkalinity and low-carbon tundish covering agent from the molten steel injection area in the tundish, and place it directly above the block of the ventilated upper nozzle. Add 20kg of high-alkalinity a...

Embodiment 2

[0038] The method for removing inclusions by blowing argon to the breathable upper nozzle block of the continuous casting tundish as described in Example 1, the difference lies in:

[0039] A method for removing inclusions by blowing argon on a ventilating upper nozzle block of a continuous casting tundish, comprising the following steps:

[0040] 1) While the continuous casting ladle is being poured, argon gas is blown into the breathable upper nozzle block. The initial argon gas flow rate is 12L / min. When the molten steel in the tundish reaches the normal pouring molten steel level, increase the argon gas flow rate to 16L / min, the flow rate of argon is preferably controlled by the slight fluctuation of the molten steel level in the area directly above the vent block;

[0041] 2) The first furnace is poured in the tundish. After the liquid steel surface in the tundish overflows the nozzle of the ladle, add 30kg of high-alkalinity and low-carbon tundish covering agent from the...

Embodiment 3

[0047] The method for removing inclusions by blowing argon to the breathable upper nozzle block of the continuous casting tundish as described in Example 1, the difference lies in:

[0048] A method for removing inclusions by blowing argon on a ventilating upper nozzle block of a continuous casting tundish, comprising the following steps:

[0049] 1) While the continuous casting ladle is being poured, argon gas is blown into the breathable upper nozzle block. The initial argon gas flow rate is 10NL / min. When the molten steel in the tundish reaches the normal pouring molten steel level, increase the argon gas flow rate to 14NL / min, the flow rate of argon is preferably controlled by the slight fluctuation of the molten steel level in the area directly above the vent block;

[0050] 2) The first furnace is poured in the tundish. After the liquid steel surface in the tundish overflows the nozzle of the ladle, add 80kg of high-alkalinity and low-carbon tundish covering agent from t...

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Abstract

The invention provides a method for removing slag inclusion of a continuous casting tundish purging upper nozzle seating brick through argon blowing. The proper amount of high-alkalinity low-carbon tundish covering agent is added to the molten steel liquid face of the area over the continuous casting tundish purging upper nozzle seating brick per charge, the problem that due to argon blowing of the continuous casting tundish purging upper nozzle seating brick, the molten steel liquid face greatly fluctuates is solved, the problem of molten steel secondary oxidization and slag entrapment can be effectively prevented, the argon bubble capture inclusion floats to the tundish liquid face to be absorbed timely by the high-alkalinity low-carbon tundish covering agent and be removed more effectively, and the metallurgical results of argon blowing slag inclusion removal of the continuous casting tundish purging upper nozzle seating brick is improved.

Description

technical field [0001] The invention relates to a method for removing inclusions by blowing argon on a ventilating upper nozzle block of a continuous casting tundish, and belongs to the technical field of iron and steel metallurgy continuous casting tundish metallurgy. Background technique [0002] At present, low-carbon aluminum-killed steel and IF steel are produced by casting slab continuous casting machines. In order to solve the problem of nozzle nodules, the method of blowing argon into the inner wall of the ventilating upper nozzle is replaced by the method of blowing argon into the inner wall of the ventilating upper nozzle in the continuous casting tundish, which not only suppresses The nozzle nodulation problem is solved, and the technical problem that the protective argon bubbles enter the steel and cause the subcutaneous bubbles of the slab is solved. However, the existing continuous casting tundish technology of blowing argon on the breathable upper nozzle block...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/117B22D11/108B22D41/58B22D41/02
CPCB22D11/108B22D11/117B22D41/02B22D41/58
Inventor 武光君
Owner SHANDONG IRON & STEEL CO LTD
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