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Smelting method for low-sulfur steel

A smelting method and technology for low-sulfur steel, applied in the field of metallurgy, can solve the problems of complex production process and high production cost of low-sulfur steel, and achieve the effects of improving the thermodynamic conditions of desulfurization and reducing the pressure of sulfur return.

Active Publication Date: 2016-07-27
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiment of the present invention provides a method for smelting low-sulfur steel, which solves the technical problems of complex production process and high production cost of low-sulfur steel in the prior art, simplifies the process flow of low-sulfur steel, and reduces the production cost of low-sulfur steel. production cost

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  • Smelting method for low-sulfur steel

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Embodiment 1

[0026] The low-sulfur steel smelting method provided in this example includes converter smelting, desulfurization of tapping slag, KR desulfurization treatment, RH refining and continuous casting process, wherein the converter is 300 tons.

[0027] During the converter smelting process, molten iron is added to the converter, and lime is added to the molten iron. The amount of lime added is 18,000kg / ton of steel. The binary basicity of the slag at the end of the converter is controlled to be 4.0, and the tapping temperature of the converter is controlled to be 1710°C.

[0028] In the process of removing sulfur from the steel slag, the slag blocking operation is adopted to control the thickness of the slag layer to ≤50mm. Add lime and fluorite before tapping 1 / 5, the amount of lime added is 3000kg, and the amount of fluorite added is 600kg. Add aluminum and iron for deoxidation when tapping 1 / 3 to 1 / 2, control the amount of aluminum and iron added according to the oxygen content...

Embodiment 2

[0031] The low-sulfur steel smelting method provided in this example includes converter smelting, desulfurization of tapping slag, KR desulfurization treatment, RH refining and continuous casting process, wherein the converter is 300 tons.

[0032] During the converter smelting process, molten iron is added to the converter, and lime is added to the molten iron. The amount of lime added is 6200kg / ton of steel. The binary basicity of the slag at the end of the converter is controlled to be 3.0, and the tapping temperature of the converter is controlled to be 1690°C.

[0033] In the process of removing sulfur from the steel slag, the slag blocking operation is adopted to control the thickness of the slag layer to ≤30mm. Add lime and fluorite before tapping 1 / 5, the amount of lime added is 1500kg, and the amount of fluorite added is 300kg. Add aluminum and iron for deoxidation when tapping 1 / 3 to 1 / 2, control the amount of aluminum and iron added according to the oxygen content a...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a smelting method for low-sulfur steel. The smelting method includes the processes of converter smelting, steel slag discharging and washing desulfuration, KR desulfuration treatment, RH refining and continuous casting. By means of the smelting method for the low-sulfur steel in the embodiment, the technical problems that in the prior art, production processes for low-sulfur steel are complex, and the production cost is high are solved, the technical processes for the low-sulfur steel are simplified, the quality of the low-sulfur steel is improved, and the production cost of the low-sulfur steel is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for smelting low-sulfur steel. Background technique [0002] The traditional low-sulfur steel production process includes hot metal desulfurization pretreatment, converter smelting, LF refining, RH refining and continuous casting process. First, hot metal desulfurization pretreatment is adopted, and then the converter uses low-sulfur steel scrap, low-sulfur lime and other raw and auxiliary materials to strictly control the converter back to sulfur, and then the molten steel is sent to LF refining, and desulfurization is carried out by using processes such as white slag making and large-bottom blowing and stirring, and then The molten steel is sent to RH for refining, and finally for continuous casting. The process flow is relatively long, so the process cost is relatively high. Pretreatment of hot metal, and then LF deep desulfurization, the desulfurization process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30C21C7/064
CPCC21C5/30C21C7/064
Inventor 高攀李海波王新华孙彦辉黄福祥庞在刚张勇罗衍昭孙亮赵东伟马文俊尹娜
Owner SHOUGANG CORPORATION
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