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Vacuum refining agent and preparation method thereof

A technology of vacuum refining and vacuum refining furnace, which is applied in the field of refining agents, can solve the problems of difficult control of steel slag performance, difficulty in quality assurance, strong oxidation of steel slag, etc., to facilitate slag/gold reaction, facilitate transportation and use, and improve alloy Yield effect

Inactive Publication Date: 2007-02-07
刘星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above method is not applicable to low-carbon steels such as non-oriented silicon steel and electrical steel currently produced by Wuhan Iron and Steel No. 2 Steelmaking Plant.
Because the content of inclusions in the above-mentioned low-carbon steel is high, the oxidation of steel slag is strong, and it is difficult to control the properties of steel slag, especially not conducive to the subsequent RH vacuum refining deep desulfurization and reduction of inclusions. The above method will lead to unstable composition of the steel. The quality of steel production is difficult to guarantee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The composition of 100 kg of refining agent is:

[0047] CaO: 45Kg Al 2 o 3 : 25Kg Al: 18Kg CaF 2 : 2Kg

[0048] SiO 2 : 8Kg The rest is C and impurities.

[0049] Use the RH silo to add, and the addition time is after the RH decarburization period, that is, 17-18 minutes. Add 230 kg / furnace, [0] reduces by 107ppm on average, and the aluminum yield in steel is 82.8%. 1.5% higher than normal heat. Medium and low grades of non-oriented silicon steel and electrical steel have an average carbon content of 20.4ppm after treatment, which is equivalent to the normal heat, and the desulfurization rate is 12.7% higher than that of the heat.

Embodiment 2

[0051] The composition of 100 kg of refining agent is:

[0052] CaO: 32Kg Al 2 o 3 : 34Kg Al: 25Kg CaF 2 : 0Kg

[0053] SiO 2 : 5Kg The rest is C and impurities.

[0054] Use the RH silo to add, and the addition time is after the RH decarburization period, that is, 17-18 minutes. Add 230 kg / furnace, [0] reduces by an average of 127ppm, and the yield of aluminum in steel is 87.9%. 6.3% higher than normal heat. Medium and low grades of non-oriented silicon steel and electrical steel have an average carbon content of 15.5ppm after treatment, which is equivalent to normal heats, and the desulfurization rate is increased by 10.3% compared with heats.

Embodiment 3

[0056] The composition of 100 kg of refining agent is:

[0057] CaO: 36Kg Al 2 o 3 : 36Kg Al: 16Kg CaF 2 : 8Kg

[0058] SiO 2 : 2Kg The rest is C and impurities.

[0059] Use the RH silo to add, and the addition time is after the RH decarburization period, that is, 17-18 minutes. Add 230 kg / furnace, [0] reduces by 128ppm on average, and the aluminum yield in steel is 84.5%. 2.9% higher than normal heat. Medium and low grades of non-oriented silicon steel and electrical steel have an average carbon content of 16.3ppm after treatment, which is equivalent to the normal heat, and the desulfurization rate is 13.1% higher than that of the heat.

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Abstract

the invention discloses a vacuum refiner in the RH vacuum refining furnace, which comprises the following parts: 32-45% CaO, 25-36% Al2O3, 15-25% Al, 0-8% CaF, 0-8% SiO2, 0-0.18% C and impurity. the invention satisfies environmental-protective request, which improves recycling and desulfurizing effect of Al.

Description

technical field [0001] The present invention relates to a refining agent used in RH vacuum refining furnaces, specifically a vacuum refining agent capable of reducing [O] inclusions in molten steel before or after alloying, improving the effect of RH vacuum refining, and improving the quality of molten steel at the same time. its preparation method. Background technique [0002] For converter steelmaking, the molten steel and slag at the end of the converter generally have strong oxidation properties, the total amount of inclusions after deoxidation is high, and affect the alloy yield; due to the addition of SiFe (some steel plants also add Alloys such as SiAlBa and SiCaBa) reduce the basicity of slag in the ladle and cause phosphorus and sulfur return; if the amount of slag is large during the tapping process, it will seriously affect the refining effect and steel quality. In view of the adverse effects caused by the above unfavorable factors in steelmaking, countries arou...

Claims

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Application Information

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IPC IPC(8): C21C7/04C21C7/06
CPCY02P10/20
Inventor 刘星
Owner 刘星
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