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Method of smelting ultra-low carbon steel in LF (Ladle Furnace)

An ultra-low carbon steel and molten steel technology, applied in the field of iron and steel metallurgy, can solve the problems of changing product properties, increasing the carbon content of molten steel, and high carbon content at the end of the molten steel, and achieves the effect of reducing the number of heating times, reducing the increase in carbon content, and reducing the carbon content at the end point.

Active Publication Date: 2014-12-10
MAGANG (GROUP) HOLDING CO LTD +1
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Problems solved by technology

In this process, the molten steel is decarburized in the RH furnace, and then goes to the LF furnace for slagging, desulfurization, and temperature rise. This operation will easily cause the molten steel in the LF furnace to increase carbon, and eventually cause the end point of the molten steel to have a high carbon content, even exceeding the range required by the regulations. change product performance

Method used

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Embodiment Construction

[0024] The specific implementation manner of the present invention will be further described in detail through the description of the best embodiment below.

[0025] The method for smelting ultra-low carbon steel in the LF furnace is specifically:

[0026] Taking the weight of each furnace of molten steel as 120 tons as an example, after the ladle car reaches the processing position, the argon blowing pipe is connected, the argon gas is turned on, and the argonized slag is blown on the molten steel. The amount of blowing, carry out the operation of strong blowing argon, the flow rate of strong blowing argon is ≧600L / min, until the slag layer is completely melted; When the argon molten steel is started, enter the next step to add aluminum to the molten steel for the first time to adjust the aluminum. If the argon molten steel is not available, weigh the lime and directly heat the molten steel;

[0027] After blowing argon, add aluminum to molten steel after the slag layer is b...

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Abstract

The invention discloses a method of smelting ultra-low carbon steel in an LF (Ladle Furnace). The method comprises the following steps of: blowing argon in quantity to fully slag before molten steel heating, so that top slag of the molten steel is completely molten; controlling bottom argon blowing during molten steel heating or closing argon before molten steel heating, and reducing the opportunity that the molten steel licks an electrode; adding aluminum and lime in batches; effectively reducing the opportunity of carbon content increasing in the smelting process by reducing heating times in the smelting process and the like; and reducing the content of end point carbon, and improving the quality and property of the product.

Description

technical field [0001] The invention relates to the iron and steel metallurgy industry, in particular to a method for smelting ultra-low carbon steel in an LF furnace. Background technique [0002] At present, the ultra-low carbon steel produced by Maanshan Iron and Steel is often limited by the conditions of Maanshan Iron and Steel's molten steel, scrap steel and CSP's own characteristics, and often adopts the RH+LF furnace dual production process. In this process, the molten steel is decarburized in the RH furnace, and then goes to the LF furnace for slagging, desulfurization, and temperature rise. This operation will easily cause the molten steel in the LF furnace to increase carbon, and eventually cause the end point of the molten steel to have a high carbon content, even exceeding the range required by the regulations. change product performance. In order to ensure that the ultra-low carbon steel produced by this process can meet the product performance requirements, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068C21C7/064
Inventor 胡玉畅解养国
Owner MAGANG (GROUP) HOLDING CO LTD
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