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Method for deoxidizing and alloying molten steel

An alloying and molten steel technology, applied in the field of metallurgical technology, can solve the problems of low alloy yield, poor deoxidation effect, and inaccurate calculation of alloy addition amount.

Inactive Publication Date: 2010-11-03
武钢集团有限公司
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  • Abstract
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Problems solved by technology

[0005] The existing converter tapping deoxidation and alloying methods have the following problems: First, the amount of alloy added is only a rough estimate, resulting in inaccurate calculation of the amount of alloy added
Secondly, the alloy is added into the molten steel from the feeding funnel without oxidation protection, and the specific gravity of most alloys is much smaller than the specific gravity of molten steel, so that it floats on the molten steel and slag, and is oxidized in large quantities, resulting in poor deoxidation effect. Alloy yield is low

Method used

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  • Method for deoxidizing and alloying molten steel
  • Method for deoxidizing and alloying molten steel
  • Method for deoxidizing and alloying molten steel

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0044] Specific examples: the known carbon content is 0.1%, the tapping temperature is 1600°C, the ferrosilicon is deoxidized, the molten steel oxygen content is 0.025% at the end of smelting, the finished molten steel contains 0.27% silicon, and the ferrosilicon contains 50% silicon.

[0045] 1. Calculate the amount of ferrosilicon added

[0046] Silicon consumed by deoxidation: 0.013%

[0047] Silicon in finished molten steel: 0.27%

[0048] Silicon required for deoxidation and alloying per ton of molten steel: 0.013%+0.27%=0.283%

[0049] The amount of ferrosilicon that should be added per ton of steel for deoxidation and alloying is 5.66kg

[0050] 2. The converter slag stopper or slag stop ball is tapped. After tapping, ladle protective slag is added to the surface of the ladle. The amount of molten steel per ton is 1kg-1.5kg.

[0051] 3. Insert the ...

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Abstract

The invention relates to a method for deoxidizing and alloying molten steel, comprising the following steps of: firstly, measuring the actual oxygen content of each heat of molten steel; then, accurately calculating alloy amount required by deoxidizing and alloying treatment; and conveying alloys with moderate particle size to molten steel of a ladle through a blowing pipe and inert gas to enable ferroalloys to completely melt before floating to the surface of molten steel so as to achieve the deoxidizing and alloying effects almost without loss. In the invention, the alloy amount is accurately calculated, alloys can be sufficiently stirred in molten steel so that the deoxidizing and alloying effects of alloys are obvious, the oxidation loss in the process of deoxidizing and alloying treatment is also avoided, and the quality of molten steel is greatly improved.

Description

technical field [0001] The invention relates to the field of metallurgical technology, in particular to a method for deoxidizing and alloying molten steel. Background technique [0002] During the smelting process of molten steel, the molten steel contains a large amount of oxygen, and the percentage of oxygen in the molten steel in the converter is 400-600×10 -6 , if the percentage of oxygen in molten steel is not reduced to a certain level (such as 80-10×10 -6 ), will seriously affect the quality and performance of the steel, so the molten steel must be deoxidized and alloyed. The alloys widely used in the existing technology include ferrosilicon, ferromanganese, aluminum iron, silicon calcium (iron), silicon manganese (iron), silicon barium (iron), silicon aluminum (iron) and so on. The alloy contains a certain proportion of silicon, manganese, aluminum, silicon calcium elements, these elements are called deoxidizing elements. At present, the following formula is gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/00
Inventor 黄诚
Owner 武钢集团有限公司
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