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Refining furnace molten steel dephosphorization method adopting component adjustment and hermetical blowing of argon gas and oxygen gas

A technology of sealing argon blowing and composition adjustment, which is applied in the field of steelmaking technology, can solve the problems of excessive phosphorus in molten steel, achieve the effects of improving internal quality, reducing smelting production costs, and reducing the loss of steel reforming and furnace waste

Active Publication Date: 2013-11-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for dephosphorizing molten steel based on CAS-OB, as an auxiliary dephosphorization method, to solve the problem of excessive phosphorus in molten steel in some furnaces when smelting low-phosphorus steel grades in steelmaking furnaces, so as to reduce The purpose of reducing the cost of smelting production and improving the intrinsic quality of steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Molten steel in tapping ladle: C0.063%; P0.018%.

[0024] The concrete control process of CAS-OB molten steel dephosphorization method of the present invention is:

[0025] 1. Steelmaking adopts non-deoxidation tapping, and the oxygen content in the steel is controlled at 0.042%; after tapping, the temperature of molten steel in the ladle is controlled at 1632°C.

[0026] 2. The clearance height of the upper part of the ladle is controlled at 400mm.

[0027] 3. During the process of steelmaking and tapping, the amount of lime added is 550kg, and the amount of fluorite added is 200kg.

[0028] 4. After the molten steel enters the CAS-OB, argon blowing operation is carried out at the bottom of the ladle, with medium-intensity stirring, and the flow rate of argon blowing is 18Nm 3 h -1 ; After blowing away the slag, lower the dipping pipe, the depth of dipping pipe insertion is 250mm.

[0029] 5. Lower the oxygen lance to blow oxygen, the height of the lance position i...

Embodiment 2

[0038] Molten steel in tapping ladle: C0.057%; P0.005%.

[0039] The concrete control process of CAS-OB molten steel dephosphorization method of the present invention is:

[0040] 1. Steelmaking adopts non-deoxidation tapping, and the oxygen content in the steel is controlled at 0.0495%; after tapping, the temperature of molten steel in the ladle is controlled at 1619°C.

[0041] 2. The clearance height of the upper part of the ladle is controlled at 550mm.

[0042] 3. During the process of steelmaking and tapping, the amount of lime added is 700kg, and the amount of fluorite added is 280kg.

[0043] 4. After the molten steel enters the CAS-OB, carry out the argon blowing operation at the bottom of the ladle, use medium-intensity stirring, and the flow rate is 30 Nm 3 h -1 ; After blowing away the slag, lower the dipping pipe, the depth of dipping pipe insertion is 300mm.

[0044] 5. Lower the oxygen gun to blow oxygen, the height of the gun position is 500mm from the molt...

Embodiment 3

[0053] Molten steel in tapping ladle: C0.038%; P0.008%.

[0054] The concrete control process of CAS-OB molten steel dephosphorization method of the present invention is:

[0055] 1. Steelmaking adopts non-deoxidation tapping, and the oxygen content in the steel is controlled at 0.0632%; after tapping, the temperature of molten steel in the ladle is controlled at 1637°C.

[0056] 2. The clearance height of the upper part of the ladle is controlled at 680mm.

[0057] 3. During the process of steelmaking and tapping, the amount of lime added is 900kg, and the amount of fluorite added is 350kg.

[0058] 4. After the molten steel enters the CAS-OB, carry out the argon blowing operation at the bottom of the ladle, use medium-intensity stirring, and the flow rate is 50 Nm 3 h -1 ; After blowing away the slag, lower the dipping tube, and the dipping tube is inserted to a depth of 200mm.

[0059] 5. Lower the oxygen gun to blow oxygen, the height of the gun position is 550mm from ...

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Abstract

The invention provides a refining furnace molten steel dephosphorization method adopting component adjustment and hermetical blowing of argon gas and oxygen gas. Steelmaking tapping without deoxidation is performed, and the oxygen content in steel, the tapping temperature, the ladle clearance and the lime and fluorite addition amount are controlled; after the molten steel enter CAS-OB, ladle bottom blowing of argon gas and moderate-intensity stirring are performed, the immersion insertion depth, the oxygen blowing gun height, the oxygen gas flow and the oxygen blow time are controlled while continuously adding lime and fluorite; after the immersion pipe is lifted, bottom blowing and strong stirring of argon gas are performed; and after the immersion pipe is re-inserted, fluorite and lime are added again, and ladle bottom blowing of argon gas and moderate-intensity stirring are performed. The method can realize the molten steel dephosphorization rate above 30% and the minimum phosphorus content can be reduced to below 0.003%, to thereby effectively solve the problem on phosphorus overproofing of the molten steel, greatly reduce steel modification and loss of re-molten defective product, reduce smelting cost, improve inherent quality of steel and provide favorable condition for the production of ultralow-phosphorus steel.

Description

technical field [0001] The invention belongs to the field of steelmaking technology, and in particular relates to a method for dephosphorizing molten steel based on composition adjustment of a sealed argon-blowing and oxygen-blowing refining furnace (CAS-OB for short). Background technique [0002] The application research of molten steel dephosphorization mainly focuses on dephosphorization of molten iron, dephosphorization in steelmaking and smelting, and dephosphorization in converter tapping process. So far, the methods that have become mature and widely used at home and abroad are mainly molten iron dephosphorization and steelmaking furnace dephosphorization, and because the dephosphorization conditions in steelmaking furnaces, especially converters, are the most widely used, but in the export The research and application of dephosphorization during steel refining outside the furnace is not common. The refining and dephosphorization methods that have been studied requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 李镇林洋孙群费鹏王晓峰于守巍方敏吴春杰
Owner ANGANG STEEL CO LTD