Method for smelting clean steel by supplementation and decarburization with CO2 at end of converter blowing

A smelting method and converter blowing technology, which is applied in the field of clean steel smelting where CO2 is supplemented and decarburized at the end of converter blowing to achieve the effects of reducing overoxidation of molten steel, reducing iron loss, and reducing FeO content
CN102146491AActive Publication Date: 2011-08-10ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANGANG STEEL CO LTD
Publication Date
2011-08-10

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Abstract

The invention discloses a method for smelting clean steel by supplementation and decarburization with CO2 at the end of converter blowing. In the method, when the clean steel is smelted by using a converter, the oxygen consumption is about 80%-95% of total theoretical calculation amount and the decarburization speed is reduced to below 50% of that in a severe decarburization period, a certain proportion of CO2 gas is mixed in oxygen for decarburization, and the content of carbon in a molten bath is controlled by a furnace gas analysis system. The method has the advantages and effects that CO2 is added in the decarburization gas at the end of converter blowing, thus a decarburization purpose can be achieved and the blowing amount of oxygen can be reduced, so that the content of oxygen in steel is reduced, the loss of the temperature in the tapping process is decreased, and the increase of the oxygen activity in the molten steel is effectively controlled, thereby achieving the purposes of reducing iron loss, lowering the dosage of alloy, decreasing the quantity of impurities in the molted steel and improving the quality of the molten steel.
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Description

technical field

[0001] The invention belongs to the technical field of steelmaking, and relates to a method for controlling the endpoint of non-oxygen smelting clean steel at the end stage of a converter, in particular to a method for controlling the end point of a converter blowing end stage using CO 2 Clean steelmaking methods that supplement decarburization. Background technique

[0002] In the process of clean steel production, it is often required to tap low-carbon steel from the converter. In order to achieve low-carbon steel tapping, it is often necessary to blow more O 2 , so often lead to excessive oxygen content in molten steel, that is, molten steel peroxidation, which will not only increase the amount of deoxidized alloy in the later stage, but also make it difficult to remove deoxidized inclusions, which indirectly leads to a decline in steel quality.

[0003] In the prior art, a COMI (CO 2 and O 2 Mixed Injection) experimental method, through the use of th...

Claims

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