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Novel aluminum steel continuous casting tundish covering agent and application thereof

A technology of continuous casting tundish and covering agent, which is applied in the field of continuous casting of iron and steel, which can solve the problems that it is not suitable for continuous casting of aluminum-containing steel, and does not take into account the reaction between molten steel and tundish covering agent steel slag, etc., to achieve the suppression of the slag-steel interface Effect of reaction, reduction of viscosity and interfacial tension, and increase of activity

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 the preparation of tundish covering agents, and do not target some aluminum-containing steel types, nor do they take into account the reaction between molten steel and tundish covering agents, and are not suitable for aluminum-containing Continuous casting of steel, especially the continuous casting tundish process of aluminum-containing steel with an Al content of 0.3-3% by mass

Method used

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  • Novel aluminum steel continuous casting tundish covering agent and application thereof

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Effect test

Embodiment 1

[0034] A new aluminum-containing steel continuous casting tundish covering agent, its composition mass percentage is: CaO 28%, SiO 2 8%, Al 2 o 3 32%, MgO 12%, (Na 2 O+Li 2O) 14% (Na 2 O / Li 2 O=13:1 mass ratio), B 2 o 3 6%. The basicity of the tundish covering agent CaO / SiO 2 is 3.5. The main physical properties of the tundish covering agent measured by the above method are shown in Table 1. The tundish covering agent designed in this embodiment is used for the continuous casting process of aluminum-containing steel with an Al mass percentage content of 3%; after testing, the total amount of inclusions in the molten steel decreases by 44% before and after the tundish, and the total oxygen content is only With an increase of 1 ppm, the temperature of molten steel drops by 5°C.

Embodiment 2

[0036] A new aluminum-containing steel continuous casting tundish covering agent, its composition mass percentage is: CaO 30%, SiO 2 6%, Al 2 o 3 30%, MgO 12%, (Na 2 O+Li 2 O) 15% (Na 2 O / Li 2 O=30:1 mass ratio), B 2 o 3 7%. The basicity of the tundish covering agent CaO / SiO 2 for 5. The main physical properties of the tundish covering agent measured by the above method are shown in Table 1. The tundish covering agent designed in this embodiment is used for the continuous casting process of aluminum-containing steel with an Al mass percentage content of 2.5%; after testing, the total amount of inclusions in molten steel decreases by 35% before and after passing through the tundish, and the total oxygen content does not increase, the molten steel temperature drops by 4°C.

Embodiment 3

[0038] A new aluminum-containing steel continuous casting tundish covering agent, its composition mass percentage is: CaO 35%, SiO 2 13%, Al 2 o 3 27%, MgO 5%, (Na 2 O+Li 2 O) 12% (Na 2 O / Li 2 O=11:1 mass ratio), B 2 o 3 8%. The basicity of the tundish covering agent CaO / SiO 2 is 2.7. The main physical properties of the tundish covering agent measured by the above method are shown in Table 1. The tundish covering agent designed in this embodiment is used in the continuous casting process of aluminum-containing steel with an Al mass percentage of 0.3%; after testing, the total amount of inclusions in molten steel decreases by 40% before and after passing through the tundish, and the total oxygen content only increases 2 ppm, the temperature of molten steel drops by 4°C.

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Abstract

The invention relates to a novel aluminum steel continuous casting tundish covering agent and the application thereof and belongs to the technical field of steel continuous casting. The tundish covering agent comprises components, by mass, 26-35% of CaO, 26-13% of SiO, 22-32% of Al2O3, 5-12% of MgO, 8-15% of (Na2O+Li2O) and 2-8% of B2O3. The tundish covering agent has the low viscosity of 0.5-1.2 Pa.s at the temperature of 1300 DEG C and has the low melting temperature of 1180 DEG C-1300 DEG C, can effectively absorb impurities in aluminum steel, improve the cleanness of molten steel in a tundish, well prevent the molten steel from being oxidized for the second time, and improve the quality of a casting blank, and has the advantages of being good in heat preserving property and the like. The designed covering agent can be well applied to the aluminum steel continuous casting process with the Al mass percentage within the range of 0.3-3%.

Description

technical field [0001] The invention relates to a novel aluminum-containing steel continuous casting tundish covering agent and application thereof, belonging to the technical field of steel continuous casting. Background technique [0002] As an important functional material in the continuous casting process, the tundish covering agent plays an important role in heat insulation and heat preservation in the continuous casting tundish to prevent crusting on the liquid surface; to isolate air and prevent secondary oxidation of molten steel; and to absorb non-metallic inclusions and other important functions. The performance of the tundish covering agent directly determines the quality of the slab, thus affecting the production efficiency. [0003] Alloying elements added to steel not only greatly improve the quality of steel, but also have adverse effects on its production process. The element Al in the aluminum-containing steel will react with some oxides in the tundish cove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111B22D1/00
CPCB22D1/00B22D11/111
Inventor 王万林周乐君刘勇罗志灿李静文马范军黄道远
Owner CENT SOUTH UNIV
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