Tundish covering agent and application thereof

A technology of tundish and covering agent, applied in the direction of improving process efficiency, etc., can solve the problems of unsuitable titanium-containing steel production, retention, and no effective treatment of titanium-containing steel, so as to improve continuous casting production conditions, prevent corrosion, The effect of strengthening the performance of preventing secondary oxidation

Inactive Publication Date: 2015-08-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these researched tundish covering agents mainly focus on heat preservation and air barrier research, and do not effectively deal with the special problems of titanium-containing steels, so they are not suitable for the production of titanium-containing steels.

Method used

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  • Tundish covering agent and application thereof
  • Tundish covering agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A tundish covering agent, its composition mass percentage is CaO: 43.4%, SiO 2 : 8.8%, Al 2 o 3 : 28%, MgO: 10%, B 2 o 3 : 1%, (Na 2 O+Li 2 O): 8.3%, TiO 2 : 0.5%. The alkalinity of the tundish covering agent is 4.9, and Na 2 O / Li 2 O (mass ratio) = 16:1; the main physical properties are shown in Table 1. After the tundish covering agent designed in this embodiment is applied to the tundish of titanium-containing steel continuous casting, the [O] in the tundish molten steel is less than 17ppm, the temperature drop of molten steel is less than 9°C, and the corrosion of the ladle lining is not serious. No encrustation occurs.

Embodiment 2

[0045] A tundish covering agent, its composition mass percentage is CaO: 38%, SiO 2 : 9%, Al 2 o 3 : 30%, MgO: 15%, B 2 o 3 : 2.1%, (Na 2 O+Li 2 O): 5.3%, TiO 2 : 0.6%. The alkalinity of the tundish covering agent is 4.2, and Na 2 O / Li 2 O (mass ratio) = 4:1; the main physical properties are shown in Table 1. After the tundish covering agent designed in this embodiment is applied to the tundish of titanium-containing steel continuous casting, the [O] in the tundish molten steel is less than 11ppm, the temperature drop of molten steel is less than 7°C, and the corrosion of the ladle lining is not serious. No encrustation occurs.

Embodiment 3

[0047] A tundish covering agent, its composition mass percentage is CaO: 40%, SiO 2 : 10%, Al 2 o 3 : 26%, MgO: 11.6%, B 2 o 3 : 3%, (Na 2 O+Li 2 O): 8.7%, TiO 2 : 0.7%. The alkalinity of the tundish covering agent is 4, and Na 2 O / Li 2 O (mass ratio) = 16:1; the main physical properties are shown in Table 1. After the tundish covering agent designed in this embodiment is applied to the tundish of titanium-containing steel continuous casting, the [O] in the tundish molten steel is less than 18ppm, the temperature drop of molten steel is less than 10°C, and the corrosion of the ladle lining is not serious. No encrustation occurs.

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Abstract

The invention relates to a tundish covering agent and application thereof and belongs to the technical field of tundishes in the continuous casting process. The tundish covering agent is mainly prepared from, by percentage content, 35-45% of CaO, 8-15% of SiO2, 25-30% of Al2O3, 5-15% of MgO, 5-12% of (Na2O+Li2O), 1-5% of B2O3 and 0.5-1% of TiO2. The tundish covering agent has the advantages that the melting point is low and is 1250-1350 DEG C, the viscosity is high and is 0.8-1.2 Pa*s at the temperature of 1300 DEG C, and the basicity is high and is 3-6. The tundish covering agent is applicable to the continuous casting production process, for producing the tundishes, of titanium-added steel. When the tundish covering agent is applied to the continuous casting production process of the titanium-added steel, produced TiO2, produced TiN and other produced inclusion can be effectively dissolved. The inclusion is prevented from entering a crystallizer, the cleanness degree of molten steel is improved, and therefore the quality of cast blanks is improved.

Description

technical field [0001] The invention relates to a tundish covering agent and its application, and belongs to the technical field of tundish in continuous casting process. Background technique [0002] With the development of society, the requirements for the cleanliness of steel are getting higher and higher, and the tundish, as the last container for molten steel before the molten steel solidifies, has a very important influence on the molten steel. At the same time, with the development of smelting technology, the tundish is no longer just a container, but more and more undertakes metallurgical functions such as purifying molten steel, isolating air, and maintaining temperature. If the tundish wants to complete such functions, the role of the covering agent is irreplaceable. Therefore, in the current smelting process, the tundish covering agent has a great influence on the smooth progress of the continuous casting process and the quality of steel. [0003] Nowadays, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111B22D1/00C21C7/076
CPCY02P10/20
Inventor 王万林周乐君罗志灿刘勇李静文黄道远马范军
Owner CENT SOUTH UNIV
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