Tundish covering agent used for chrome-bearing steel and application thereof

A technology of tundish and covering agent, which is applied in the field of tundish covering agent for chromium-containing steel, can solve problems such as stagnation, the performance of tundish covering agent is not effectively treated, and is not suitable for continuous casting production of chromium-containing steel, so as to prevent coiling Slag, good spreadability, effect of increasing viscosity

Inactive Publication Date: 2015-09-02
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. For the high melting point substance Cr produced by chromium-containing steel, 2 o 3 The impact on the performance of the tundish covering agent has not been effectively dealt with
Therefore these tundish covering agents are not suitable for continuous casting production of chromium-containing steel

Method used

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  • Tundish covering agent used for chrome-bearing steel and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A tundish covering agent for chromium-containing steel, the composition mass percentage of which is CaO: 32%, SiO 2 : 10%, Al 2 o 3 : 33%, MgO: 10%, B 2 o 3 : 1%, (Na 2 O+Li 2 O): 14%. The alkalinity of the tundish covering agent is 3.2, and Na 2 O / Li 2 O (mass ratio) = 13:1, the main physical properties are shown in Table 1. The tundish covering agent designed in this embodiment is applied in the tundish of chromium-containing steel continuous casting, and the Cr content absorbed and melted in the tundish covering agent after casting is 1.2%, [O] in the tundish molten steel is less than 28ppm, and the molten steel temperature If the drop is less than 8°C, the corrosion of the ladle lining is not serious.

Embodiment 2

[0042] A tundish covering agent for chromium-containing steel, the composition mass percentage of which is CaO: 36%, SiO 2 : 8%, Al 2 o 3 : 33.8%, MgO: 7.5%, B 2 o 3 : 2.2%, (Na 2 O+Li 2 O): 12.5%. The alkalinity of the tundish covering agent is 4.5, and Na 2 O / Li 2 O (mass ratio) = 24:1, and the main physical properties are shown in Table 1. The tundish covering agent designed in this embodiment is applied in the tundish of chromium-containing steel continuous casting. After casting, the Cr content absorbed and melted in the tundish covering agent is 0.8%, [O] in the tundish molten steel is less than 31ppm, and the molten steel temperature If the drop is less than 11°C, the corrosion of the ladle lining is not serious.

Embodiment 3

[0044] A tundish covering agent for chromium-containing steel, the composition mass percentage of which is CaO: 42%, SiO 2 : 10%, Al 2 o 3 : 30%, MgO: 6%, B 2 o 3 : 2.0%, (Na 2 O+Li 2 O): 10%. The alkalinity of the tundish covering agent is 4.2, and Na 2 O / Li 2 O (mass ratio) = 9:1, and the main physical properties are shown in Table 1. The tundish covering agent designed in this embodiment is applied in the tundish of chromium-containing steel continuous casting. After casting, the Cr content absorbed and melted in the tundish covering agent is 0.8%, [O] in the tundish molten steel is less than 25ppm, and the molten steel temperature If the drop is less than 7°C, the corrosion of the ladle lining is not serious.

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Abstract

The invention relates to a tundish covering agent used for chrome-bearing steel and application thereof and belongs to the technical field of tundishes in the continuous casting process. The tundish covering agent comprises, by mass percent, 30%-45% of CaO, 5%-10% of SiO2, 30%-35% of Al2O3, 5%-10% of MgO, 1%-4% of B2O3 and 6%-15% of (Na2O+Li2O). The tundish covering agent has the advantages that the melting point is low and is 1200-1300 DEG C, the viscosity is high and is 0.7-1.5Pa*s at the temperature of 1300 DEG C, and the alkalinity is high and is 3.0-5.0. The tundish covering agent is applicable to the process of the tundishes produced through continuous casting of the chrome-bearing steel. The tundish covering agent is applied to the continuous casting production process of the chrome-bearing steel, Cr2O3 inclusion can be effectively absorbed and dissolved, Cr2O3 is prevented from entering a crystallizer, the cleanliness 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 for chromium-containing steel and an application thereof, belonging to the technical field of tundishes in the continuous casting process. Background technique [0002] The tundish covering agent is an important functional material in the continuous casting production. Adding the tundish covering agent in the tundish can insulate the molten steel and prevent the molten steel from having a large temperature drop before continuous casting; to isolate the air, Prevent secondary oxidation of molten steel; and absorb inclusions in molten steel, etc. Therefore, the performance of the tundish covering agent affects the smooth progress of the continuous casting process and product quality, and plays an important role in the continuous casting production. [0003] Although the alloying element Cr added to chromium-containing steel can greatly improve the performance of the steel, Cr in the steel will also have ...

Claims

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Application Information

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