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

A smelting method and converter blowing technology are applied in the field of clean steel smelting where CO2 supplementary decarburization is used in the final stage of converter blowing to achieve the effects of reducing the number of inclusions, temperature loss and FeO content

Active Publication Date: 2014-01-01
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] None of these patent applications address how to use CO blowing in the production of clean steel 2 Elaboration on decarbonization

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) The total amount of oxygen consumption is controlled by a mathematical model. When the blowing reaches 80% of the total oxygen consumption, the first gas switching judgment is made. At this time, the decarburization rate has not yet dropped to 50% of the severe decarburization period. Continue to blow oxygen;

[0035] (2) When the blowing reaches 88% of the total oxygen consumption, the second gas switching judgment is made. At this time, the decarburization rate has dropped to 50% of the severe decarburization period, and the mathematical model judges that the carbon content is 0.24%. When the gas injection is carried out by O 2 switch to O 2 with CO 2 mixed gas, CO 2 The content accounts for 11% of the air blowing volume, and the air supply intensity is 2.0Nm 3 / t min;

[0036] (3) When the measured carbon content is 0.072%, stop blowing;

Embodiment 2

[0038] (1) The total amount of oxygen consumption is controlled by a mathematical model. When blowing reaches 85% of the total oxygen consumption, the first gas switching judgment is made. At this time, the decarburization rate has not yet dropped to 50% of the severe decarburization period. Continue to blow oxygen;

[0039] (2) When the blowing reaches 90% of the total oxygen consumption, the second gas switching judgment is made. At this time, the decarburization rate has dropped to 50% of the severe decarburization period. The mathematical model judges that the carbon content is 0.18%. gas, that completes the blown gas by O 2 Switch to O 2 with CO 2 mixed gas, CO 2 The content accounts for 14% of the air blowing volume, and the air supply intensity is 2.0Nm 3 / t min;

[0040] (3) When the measured carbon content is 0.06%, stop blowing;

Embodiment 3

[0042] (1) The total amount of oxygen consumption is controlled by the mathematical model. When the blowing reaches 90% of the total oxygen consumption, the first gas switching judgment is made. At this time, the decarburization rate has not yet dropped to 50% of the severe decarburization period. Continue to blow oxygen;

[0043] (2) When the blowing reaches 92% of the total oxygen consumption, the second gas switching judgment is made. At this time, the decarburization rate has dropped below 50% of the severe decarburization period, and the mathematical model judges that the carbon content is 0.12%. switch gas, i.e. finish blowing gas by O 2 Switch to O 2 with CO 2 mixed gas, CO 2 The content accounts for 18% of the air blowing volume, and the air supply intensity is 2.0Nm 3 / t min;

[0044] (3) When the measured carbon content is 0.072%, stop blowing;

[0045] The implementation results are listed in Table 2. The blowing is controlled smoothly during the operation pr...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C7/068
Inventor 唐复平万雪峰李德刚赵成林赵刚曹东
Owner ANGANG STEEL CO LTD
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