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A method for smelting in a top-bottom combined blowing converter

A technology of top-bottom re-blowing and smelting method, applied in the direction of manufacturing converters, etc., can solve the problems of reducing carbon and oxygen content, many non-metallic inclusions in steel, increasing consumption of deoxidized alloys, etc. Dephosphorization rate, the effect of promoting sufficient balance

Active Publication Date: 2019-09-03
SHOUGANG CORPORATION
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  • Claims
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Problems solved by technology

[0002] A high carbon and oxygen product at the end of the converter will lead to a series of problems such as high oxygen content at the end of the converter, increased consumption of deoxidized alloys, and more non-metallic inclusions in steel grades, which seriously affect the production quality of high-quality automotive sheets
In order to reduce the carbon and oxygen accumulation at the end point of the converter, the bottom blowing gas is often used to stir the molten steel to realize the mixing between the converter steel slag and promote the reduction of the carbon and oxygen accumulation. Reduce the content of carbon and oxygen products, resulting in poor effect of reducing carbon and oxygen products

Method used

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  • A method for smelting in a top-bottom combined blowing converter

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Embodiment Construction

[0019] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0020] Embodiments of the present invention provide a method for smelting a top-bottom combined blowing converter, such as figure 1 As shown, the method includes:

[0021] Step 101: In the process of blowing molten steel by using the top-bottom combined blowing converter, when the oxygen supply of the top-bottom combined blowing converter is 80-85%, add limestone to the molten steel.

[0022] Step 102: During the process of using ...

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Abstract

The invention relates to the technical field of converter smelting, in particular to a smelting method of a top-bottom combined blowing converter. The method comprises the steps of during a process of utilizing the top-bottom combined blowing converter for blowing molten steel, and when the oxygen supply rate of the top-bottom combined blowing converter is 80 to 85 percent, adding limestone in the molten steel; during a process of utilizing an oxygen lance for blowing oxygen to the molten steel added with the limestone, converting a the lance position of the oxygen lance according to a preset lance position conversion frequency and a preset lance position conversion sequence. According to the smelting method of the top-bottom combined blowing converter provided by the invention, when the oxygen supply rate of the top-bottom combined blowing converter is 80 to 85 percent, the limestone is added in the molten steel and is decomposed in the molten steel, the generated carbon monoxide and carbon dioxide can further play a role in stirring, and the sufficient balance between melting slags and furnace steel slags is promoted, so that carbon-oxygen equilibrium of a converter terminal can be further reduced.

Description

technical field [0001] The invention relates to the technical field of converter smelting, in particular to a smelting method of a top-bottom combined blowing converter. Background technique [0002] A high carbon and oxygen product at the end of the converter will lead to a series of problems such as high oxygen content at the end of the converter, increased consumption of deoxidized alloys, and more non-metallic inclusions in steel grades, which seriously affect the production quality of high-quality automotive sheets. In order to reduce the carbon and oxygen accumulation at the end point of the converter, the bottom blowing gas is often used to stir the molten steel to realize the mixing between the converter steel slag and promote the reduction of the carbon and oxygen accumulation. Reducing the content of carbon and oxygen deposits results in a poor effect of reducing carbon and oxygen deposits. Contents of the invention [0003] In view of the above problems, the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35
Inventor 高攀李海波王新华吕迺冰王建伟于会香彭开玉刘风刚郭玉明赵晓东孙亮
Owner SHOUGANG CORPORATION
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