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Smelting method for ultra-low carbon steel

A smelting method and technology for ultra-low carbon steel, applied in the field of iron and steel smelting, can solve the problem of high oxide inclusions, and achieve the effects of improving the cleanliness of molten steel, improving pourability, and reducing oxidizability

Active Publication Date: 2016-08-03
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present application provides a method for smelting ultra-low carbon steel, which solves the technical problem of high oxide inclusions in molten steel in the prior art, reduces the oxidizability of slag, and improves the cleanliness of molten steel

Method used

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  • Smelting method for ultra-low carbon steel

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Embodiment 1

[0032] The embodiment of the present application provides a method for smelting ultra-low carbon steel, including:

[0033] Step S1: Smelting molten iron through a converter, and adding high-calcium-aluminum slag balls according to the oxygen content at the end of the converter to reduce the TFe content in the top slag when tapping the converter, thereby obtaining molten steel;

[0034] Step S2: vacuum refining the molten steel through RH, and evenly sprinkle high-calcium aluminum slag balls on the slag surface at the end of RH breaking to further reduce the TFe content in the slag, thereby obtaining molten steel with high cleanliness;

[0035] Step S3: Continuous casting the molten steel with high cleanliness to obtain a finished product.

[0036] Wherein, in step S1, the molten iron is smelted by a converter to obtain molten steel. When the converter is tapping, adding high-calcium aluminum slag balls according to the oxygen content at the end of the converter to reduce the ...

Embodiment 2

[0062] In the examples of this application, the initial C content of molten iron is 4.48%, the P content is 0.085%, the converter tapping temperature is controlled at 1682°C, the final carbon content is 0.039%, the P content is 0.0070%, and the final oxygen content is 706ppm. The steel time is 466s, 98.92kg of bauxite is added, 508.1kg of small lime is added, and 346.1kg of high-calcium aluminum slag balls are added according to the calculation of oxygen content. The TFe of the slag is 15.68%, the TFe of the slag at the end of RH is 4.95%, and the TFe of the slag before the end of RH is 3.73%. After adopting the above dynamic two-step slag reforming process, the final slag TFe of converter tapping is reduced from 15.68% to 3.73% of the TFe of the slag before the RH ends. Package T.[O] can be controlled at 20×10 -6 Therefore, the TFe content in the ultra-low carbon steel slag is significantly reduced, which plays a role in reducing the oxidation of slag and improving the clean...

Embodiment 3

[0064] In the examples of this application, the initial C content of smelted molten iron is 4.04%, the P content is 0.076%, the converter tapping temperature is controlled at 1703°C, the final carbon content is 0.024%, the P content is 0.0097%, and the final oxygen content is 603ppm. The steel time is 510s, 100.03kg of bauxite is added, 488.9kg of small lime is added, and 330.4kg of high-calcium aluminum slag balls are added according to the calculation of oxygen content. The slag TFe is 16.21%, the slag TFe after RH is 3.4%, and the slag TFe before RH is 2.15%. After adopting the above dynamic two-step slag reforming process, the final slag TFe of converter tapping is reduced from 16.21% to 2.15% of the TFe of the slag before the end of RH. The T.[O] content is 0.0022%, so the TFe content in the ultra-low carbon steel slag is significantly reduced, which can reduce the oxidation of slag and improve the cleanliness of molten steel.

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Abstract

The invention discloses a smelting method for ultra-low carbon steel. The smelting method for the ultra-low carbon steel comprises the steps that molten iron is smelted through a converter; when steel is discharged out of the converter, high-calcium aluminum slag balls are added according to the end-point oxygen content of the converter so as to reduce the TFe content in top slag, so that molten steel is obtained; the molten steel is subjected to RH vacuum refining, the high-calcium aluminum slag balls are scattered to the slag surface evenly when RH vacuum breaking is completed, and the TFe content in the slag is further reduced, so that molten steel with a high clean degree is obtained; and a finished product is obtained by continuously casting the molten steel with the high clean degree. By means of the smelting method for the ultra-low carbon steel, the oxidability of ladle slag of the ultra-low carbon steel can be reduced remarkably, the castability of the molten steel is improved, and the clean degree of the molten steel is increased.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for smelting ultra-low carbon steel. Background technique [0002] When the converter smelts ultra-low carbon steel (C<0.0030%), the current ultra-low carbon steel smelting process is the converter-RH vacuum treatment-continuous casting process. In the smelting process of ultra-low carbon steel, reasonable control of slag is crucial to the cleanliness of molten steel. High FeO in slag will cause secondary oxidation of molten steel in the subsequent process. A good top slag can not only protect the molten steel and avoid the secondary oxidation of the molten steel, but for ultra-low carbon steel, because it needs to undergo RH vacuum treatment and use carbon-oxygen reaction to reduce the carbon content in the steel, good The top slag can also reduce the transfer of oxygen from the top slag to the molten steel, reduce the diffusion of nitrogen in the ai...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C7/10C21C7/068C21C7/06C21C5/28
CPCC21C5/28C21C7/06C21C7/068C21C7/076C21C7/10Y02P10/20
Inventor 罗衍昭李海波青靓干明崔阳庞在刚倪有金陈建光刘慧裴兴伟朱建强王东胡卫东尹娜赵东伟马文俊
Owner SHOUGANG CORPORATION
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