Method for reducing inclusion content of casting blank

A technology of inclusions and content, which is applied in the field of reducing the content of inclusions in the slab in the continuous casting process, can solve problems such as slab defects, waste products, and increased oxide inclusions, so as to reduce slab defects and waste products and improve product quality. mass, the effect of avoiding inhalation

Inactive Publication Date: 2011-03-30
ANGANG STEEL CO LTD
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Problems solved by technology

[0004] In the above method, no protective measures are taken for the molten steel entering the tundish at the initial stage of pouring. At this time, the molten steel in the tundish is directly in contact with the atmosphere, so the molten steel will undergo secondary oxidation, which will increase the inclusion of oxides in the steel, and Resulting strand defects and rejects

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  • Method for reducing inclusion content of casting blank
  • Method for reducing inclusion content of casting blank
  • Method for reducing inclusion content of casting blank

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Embodiment Construction

[0011] The specific embodiment of the present invention is described further below:

[0012] 1. Steelmaking: A 100-ton converter is used, and the loading capacity is: 94.6 tons of molten iron and 12.4 tons of scrap steel. After the composition and temperature of the molten steel meet the requirements, the slag is blocked and tapped.

[0013] 2. Refining: use LF furnace refining and VD refining device to refine and degas the molten steel, so that the temperature and composition of the molten steel meet the requirements of the continuous casting machine, during which the molten steel is blown with argon throughout;

[0014] 3. Continuous casting: Before injecting molten steel into the tundish through the long nozzle at the bottom of the molten steel tank, blow nitrogen into the tundish with a vent pipe (φ32mm) on the upper part of the tundish, and the nitrogen pressure is 0.4MPa; After being capped by nitrogen gas (about 2-3 minutes), open the nozzle at the bottom of the molten ...

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Abstract

The invention discloses a method for reducing inclusion content of a casting blank. The production processes comprise steel making, refining, continuous casting, heating in a heating furnace and continuous rolling. The method is characterized in that: during continuous casting, before molten steel is injected into a tundish, an inert gas is blown into the tundish by using a breather pipe above the tundish; after the interior of the tundish is basically covered by the inert gas, a long nozzle at the bottom of a molten steel tank is opened so that the molten steel enters the tundish; after the molten steel in the tundish reaches 1/4 of the height of the tundish, a covering agent is added into the tundish; and after the covering agent is melted and the molten steel is fully covered, the blowing of the inert gas is stopped. The tundish is covered by the inert gas blown into the tundish before casting, and then the molten steel at the initial casting stage is prevented from directly contacting the atmosphere so that air suction and secondary oxidation of the molten steel are avoided and the purpose of reducing the inclusion in the casting blank is fulfilled.

Description

technical field [0001] The invention relates to a method for improving the quality of casting slabs, in particular to a method for reducing the content of inclusions in casting slabs during continuous casting. Background technique [0002] The traditional continuous casting production process is: steelmaking-refining-continuous casting. Usually, conventional electric furnace or converter is used for steelmaking. After steelmaking, molten steel is refined in LF and RH or VD refining devices, and then continuous casting is carried out in billet or slab continuous casting machine. After the billet is bent, straightened and sheared , is sent to the next process for subsequent process processing. [0003] In the above process, the methods adopted to control the content of inclusions mainly include: during the converter smelting process, under the conditions of ensuring the temperature and composition of the molten steel specified by the steel type, the oxidation of the molten st...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/117B22D11/111
Inventor 雷洪波许刚张晓军曹维华李惊鸿叶印鹏薛军徐向阳
Owner ANGANG STEEL CO LTD
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