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A low-titanium double-layer covering agent for silicon steel and its application method

A technology of covering agent and silicon steel, which is applied in the field of metallurgy, can solve the problems of increasing titanium in molten steel, etc., and achieve the effects of improving the magnetic properties of finished products, reducing thermodynamic conditions, and reducing Ti sources

Active Publication Date: 2019-10-11
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the actual production process, it is found that the titanium content in the covering agent has a significant impact on the titanium composition in the molten steel during the casting process. However, due to the high content of silicon and aluminum in the molten steel of high-grade silicon steel, the silicon and aluminum elements in the molten steel will be included in the casting process. The titanium dioxide in the slag is reduced, resulting in the increase of titanium in molten steel

Method used

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  • A low-titanium double-layer covering agent for silicon steel and its application method
  • A low-titanium double-layer covering agent for silicon steel and its application method
  • A low-titanium double-layer covering agent for silicon steel and its application method

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preparation example Construction

[0086] The preparation method of the covering agent includes: mixing the materials of the above-mentioned components according to the weight ratio, and crushing until the average particle size is 1-10mm; or first crushing each material until the average particle size is 1-10mm, and then pressing The weight ratio is mixed evenly.

[0087] Such as figure 1 As shown, the embodiment of the present invention is used for the use method of the low-titanium double-layer covering agent of silicon steel, and described method comprises the following steps:

[0088] 1) When the weight of molten steel in the tundish reaches 1 / 8-1 / 4 of the normal casting weight, add 35-55kg of lower layer covering agent to the molten steel surface; when the weight of molten steel in the tundish reaches 1 / 3-2 of the normal casting weight / 3, add 60-80kg of lower layer covering agent to the molten steel surface;

[0089] 2) When the molten steel in the tundish reaches the normal casting weight, after the li...

Embodiment 1

[0094] Embodiment 1 of the present invention is a special low-titanium double-layer covering agent for high-grade silicon steel, including an upper layer covering agent and a lower layer covering agent, wherein the chemical composition and weight percentage of the upper layer covering agent are: SiO 2 45%, MgO 5%, CaO6%, Fe 2 o 3 4%, Al 2 o 3 22%, C (full) 0.4%, TiO 2 ≤0.2%, the remainder is loss on ignition; the chemical composition and weight percentage of the lower covering agent are: SiO 2 16%, MgO 5%, CaO 56%, Fe 2 o 3 4%, Al 2 o 3 0.6%, C (full) 0.4%, TiO 2 0.12%, the balance is loss on ignition.

[0095] Embodiment 1 of the present invention is used for the use method of the low-titanium double-layer covering agent of silicon steel, and described method comprises the steps:

[0096] 1) When the weight of the molten steel in the tundish is 1 / 6, add the lower covering agent, add 25kg of the lower covering agent to the temperature measurement sampling holes ...

Embodiment 2

[0102] Embodiment 2 of the present invention is a special low-titanium double-layer covering agent for high-grade silicon steel, including an upper layer covering agent and a lower layer covering agent, wherein the chemical composition and weight percentage of the upper layer covering agent are: SiO 2 53%, MgO 7%, CaO7%, Fe 2 o 3 4%, Al 2 o 3 30%, C (full) 0.7%, TiO 2 0.34%, the balance is loss on ignition; the chemical composition and weight percentage of the lower layer covering agent are: SiO 2 21%, MgO 6%, CaO 61%, Fe 2 o 3 7%, Al 2 o 3 0.6%, C (full) 0.6%, TiO 2 0.08%, the balance is loss on ignition.

[0103] Embodiment 2 of the present invention is used for the use method of the low-titanium double-layer covering agent of silicon steel, and described method comprises the following steps:

[0104] 1) When the weight of the molten steel in the tundish is 1 / 8, start to add the lower layer covering agent, add 20kg of the lower layer covering agent to the tem...

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Abstract

The invention provides a low-titanium-content double-layer covering agent for silicon steel and a use method of the low-titanium-content double-layer covering agent. The low-titanium-content double-layer covering agent comprises an upper layer covering agent part and a lower layer covering agent part; the lower layer covering agent part is contacted with molten steel; the upper layer covering agent part is located above the lower layer covering agent part; the upper layer covering agent part comprises the following raw materials, by weight percentage, 44-62% of SiO2, 2-10% of MgO, 1-10% of CaO, greater than 0 and less than or equal to 7% of Fe2O3, 20-38% of Al2O3, greater than 0 and less than or equal to 1% of C (all), greater than 0 and less than or equal to 0.5% of TiO2, and the balance ignition lost; and the lower layer covering agent part comprises the following raw materials, by weight percentage, 15-25% of SiO2, 3-8% of MgO, 48-68% of CaO, 2-10% of Fe2O3, greater than 0 and less than or equal to 1% of Al2O3, greater than 0 and less than or equal to 1% of C (all), greater than 0 and less than or equal to 0.2% of TiO2, and the balance ignition loss. With the use of the low-titanium-content double-layer covering agent, the content of titanium in molten silicon steel can be reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a low-titanium double-layer covering agent for silicon steel and its application method. Background technique [0002] With the maturity of the trinity smelting process of primary smelting-refining-continuous casting in the modern iron and steel industry, the tundish covering agent, as one of the important components, is mainly used to cover the surface of molten steel in the tundish during the continuous casting process. The basic requirements are: No adverse reaction with molten steel to avoid contamination of molten steel; no corrosion of alkaline tundish lining. Its main functions are: heat preservation of molten steel, avoiding excessive temperature drop of molten steel in the tundish during pouring and cold steel on the surface of molten steel, forming a liquid slag layer covering the surface of molten steel to isolate air and preventing secondary oxidation of molten ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 赵艳宇彭开玉刘珍童胡卫东李志军刘建斌闵常杰张远芬
Owner BEIJING SHOUGANG CO LTD
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