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Refining method for reducing steel ladle lining erosion

A ladle and ladle lining technology, which is applied in the refining field of reducing ladle lining erosion, can solve the problems of ladle slag line erosion, increase in the number of foreign inclusions, serious problems, etc., to reduce erosion, reduce the content of foreign inclusions, and improve the life of the ladle Effect

Inactive Publication Date: 2018-03-27
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the VD furnace treatment, the corrosion of the slag line of the ladle is more serious, and the number of foreign inclusions in the molten steel increases at the same time

Method used

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  • Refining method for reducing steel ladle lining erosion
  • Refining method for reducing steel ladle lining erosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The refining method for reducing ladle lining corrosion adopts the following specific processes.

[0022] During the refining process of aluminum-containing steel SWRCH22A in LF furnace, the types and specific additions of materials are: lime 4.6kg / ton steel, fluorite 1.0kg / ton steel, pre-melted refining slag 1.6kg / ton steel, calcium carbide 0.67kg / ton per ton of steel, aluminum powder 0.64kg / ton of steel, magnesia 1.3kg / ton of steel. After the refining process, the temperature of the molten steel and the refining slag out of the station were sampled and tested for the main components. The specific results were (wt): CaO 53.62%, SiO 2 4.35%, Al 2 o 3 26.83%, MgO 12.04%, FeO+MnO 0.92%, molten steel temperature 1705°C. The finished cast slab of this embodiment was tested for inclusions, and the specific test results are shown in Table 1.

Embodiment 2

[0023] Embodiment 2: The refining method for reducing ladle lining corrosion adopts the following specific processes.

[0024] During the refining process of aluminum-containing steel SWRCH22A in the LF furnace, the types and specific additions of materials are: lime 4.9kg / ton steel, fluorite 1.06kg / ton steel, pre-melted refining slag 1.6kg / ton steel, calcium carbide 0.76kg / ton per ton of steel, aluminum powder 0.5kg / ton of steel, magnesia 1.6kg / ton of steel. After the refining process, the temperature of the molten steel and the refining slag out of the station were sampled and tested for the main components. The specific results were (wt): CaO 52.36%, SiO 2 5.14%, Al 2 o 3 27.42%, MgO 13.0%, FeO+MnO 0.89%, molten steel temperature 1702°C. The finished cast slab of this embodiment was tested for inclusions, and the specific test results are shown in Table 1.

Embodiment 3

[0030] Embodiment 3: The refining method for reducing ladle lining corrosion adopts the following specific processes.

[0031] During the refining process of H08A steel in LF furnace, the types and specific additions of materials are: lime 5.5kg / ton steel, fluorite 1.2kg / ton steel, pre-melted refining slag 2.0kg / ton steel, calcium carbide 0.72kg / ton steel , aluminum powder 0.68kg / ton steel, magnesia 1.4kg / ton steel. After the refining process, the temperature of the molten steel and the refining slag out of the station were sampled and tested for the main components. The specific results were (wt): CaO 56.27%, SiO 2 3.94%, Al 2 o 3 24.33%, MgO 12.51%, FeO+MnO 0.93%, molten steel temperature 1699°C. The finished casting slab of this embodiment was inspected for inclusions, and the specific inspection results are shown in Table 2.

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Abstract

The invention discloses a refining method for reducing steel ladle lining erosion. The refining method comprises LF refining and VD refining. In the later stage of LF refining, a magnesium raw material is added in a steel ladle. According to the method, the magnesium fireproof raw material is used for adjusting the content of magnesium in refining slag so that the concentration difference of the magnesium content between magnesium-carbon bricks and the refining slag can be reduced; in the VD furnace vacuum treatment process, erosion of the refining slag to the steel ladle lining magnesium-carbon bricks is restrained; and the purposes of reducing the steel ladle lining erosion and reducing the content of foreign inclusions in molten steel are achieved. By means of the method, erosion of furnace slag to a steel ladle lining in the VD processing process is reduced, the service life of the steel ladle is prolonged, and meanwhile, the molten steel inclusions are reduced.

Description

technical field [0001] The invention relates to a refining method, in particular to a refining method for reducing ladle lining erosion. Background technique [0002] In the production process of variety steel, LF-VD refining technology is a relatively common refining method. Since the molten steel is in a closed state during the vacuum treatment process of the VD furnace, operations such as heating up, deoxidation, alloying, and wire feeding cannot be performed on the molten steel, so the temperature of the molten steel is relatively high before being treated by the VD furnace. The ladle lining is mostly built with magnesia carbon bricks, aluminum magnesia carbon bricks, corundum prefabricated blocks and other materials. During the vacuum treatment process, the degassing reaction near the ladle slag line is the strongest, and the corrosion of the ladle lining is also the most serious, making the ladle The service life is reduced, and at the same time, the number of foreign...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/10
CPCC21C7/0087C21C7/10
Inventor 李亚厚康毅梁新维贾元海连庆靳刚强
Owner HEBEI IRON AND STEEL
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