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Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion

A continuous casting nozzle and anti-clogging technology, which is applied to casting equipment, casting molten material containers, metal processing equipment, etc., can solve the problems of inability to prevent nozzle clogging, billet defects, and limited CaO composition, and achieve improved anti-clogging and Reduce erosion, improve effect, power supply and convenient operation on site

Inactive Publication Date: 2008-05-14
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to solid solution into ZrO 2 The amount of CaO in the lattice is certain, therefore, by ZrO 2 The amount of CaO component brought in is limited and cannot continuously prevent the nozzle from being blocked
[0031] (2) The blown gas is easy to form slab defects: the gas blown into the molten steel from the inner wall of the nozzle can easily form large bubbles and be involved in the steel flow, forming surface defects of the slab
[0032] (3) The erosion of the nozzle cannot be suppressed while preventing the clogging of the nozzle: among the above-mentioned methods of preventing the nozzle from clogging, the factors that cause the erosion of the nozzle are not considered
Especially when the additional layer inside the nozzle containing CaO is used, due to the formation of calcium aluminate low-melting point compounds, the nozzle will be severely eroded and the service life of the nozzle will be affected.

Method used

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  • Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion
  • Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion
  • Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3， Embodiment 5

[0064] A continuous casting nozzle of a steel casting furnace is used, and the composition of pouring molten steel is: C 0.0030-0.35%, Si 0.01-0.45%, Mn 0.2-1.2%, P 0.006-0.02%, S 0.001-0.030%. The cast slabs are slabs, round billets and thin slabs.

[0065] Such as Figure 1-2 As shown, the inner wall of the continuous casting nozzle of the casting furnace is used as one pole, and the molten steel is used as the other pole. By changing the polarity of the electric field and the magnitude of the current on the inner wall of the nozzle, the adhesion speed of oxides in the molten steel on the inner wall of the nozzle is controlled.

[0066] The inner wall lining of the tundish is made of MgO or MgO-CaO paint, and the inner wall lining of the continuous casting nozzle is made of conductive refractory material. The inner wall lining of the continuous casting nozzle is Al 2 o 3 - C quality and inner layer lined with ZrO 2 Al 2 o 3 -ZrO 2 -C quality refractory material, slidi...

Embodiment 4

[0071] Except that this embodiment is an embodiment after changing the positive and negative poles of the electric field, that is, the nozzle (inner wall) is connected to the negative pole of the power supply, and the molten steel is connected to the positive pole, the others are the same as Embodiments 1-3 and Embodiment 5. casting operation.

[0072] Under the action of the electric field, the oxygen position at the contact interface between the nozzle and the molten steel decreases, thereby reducing the oxidation and adhesion of acid-soluble aluminum on the surface of the nozzle (inner wall). In addition, due to the electrochemical action, the oxides on the surface of the nozzle (inner wall) will dissolve and decompose, further reducing the blockage of the nozzle. The results are as described in Table 1.

[0073] Table 1

[0074]

[0075]

Embodiment 6-10

[0081] Except that the continuous casting nozzle itself is made of the above-mentioned conductive refractory material, the continuous casting operation is carried out as in Examples 1-5. The results are as described in Examples 1-5 in Table 1.

[0082] Evaluation of the test results shown in Table 1 was carried out in the following manner.

[0083] Comments on nozzle clogging:

[0084] Evaluation is carried out according to the amount of steel passing through each nozzle without clogging and stable pouring.

[0085] Excellent: the amount of steel passing through is more than 500 tons, no blockage occurs,

[0086] Good: The amount of steel passing through is more than 400 tons, and no blockage occurs.

[0087] Possible: the amount of steel passing through is more than 300 tons, no blockage occurs,

[0088] Inferior: The effect of anti-blocking is not obvious, and the amount of steel passed cannot reach 300 tons.

[0089] Evaluation on the anti-corrosion performance of nozzle...

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Abstract

The invention relates to an anti-block and erosion-reducing method for continuous casting nozzle, which has the advantages that: a DC electric field is applied between an inner wall of the continuous casting nozzle and a plurality of liquid steels; based on the specific situation of the blockage and erosion in the nozzle, the adhesion speed of the oxide in the liquid steels to the inner wall is controlled by changing the polarities of the electric field in the inner wall of the nozzle, so as to prevent the blockage and erosion of the nozzle.

Description

technical field [0001] The invention relates to a method for preparing and using a continuous casting nozzle of a steel casting furnace, in particular to a method for preventing clogging and reducing erosion of a continuous casting nozzle of a steel casting furnace. Background technique [0002] With the continuous improvement of modern industry's requirements for steel quality, almost all steel types need to be refined outside the steel casting furnace to further remove harmful elements such as nitrogen, hydrogen, oxygen, phosphorus, and sulfur in the steel. In order to control the free oxygen content in the steel, a large amount of deoxidized alloy is generally added in the refining process for deep deoxidation to generate corresponding oxides. Most of these oxides can be removed from the molten steel by floating into the slag during the refining process and during the residence of the molten steel in the tundish, but some of them will remain in the molten steel in the for...

Claims

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Application Information

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IPC IPC(8): B22D41/50
Inventor 沈建国任玉森
Owner BAOSHAN IRON & STEEL CO LTD
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