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Method for smelting high-purity steel through vacuum induction furnace

A technology of vacuum induction furnace and pure steel, which is applied in the direction of improving energy efficiency and process efficiency, and can solve the problems that cannot be reduced to a lower level, and achieve the effect of reducing the effect of heat release

Inactive Publication Date: 2012-07-25
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology can reduce certain elements in the steel to a lower level respectively, but cannot reduce the content of carbon, nitrogen, oxygen, sulfur, hydrogen, and acid-melted aluminum to a lower level at the same time, that is, the above six elements in the steel The total content of the content generally exceeds 100ppm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for smelting high-purity steel in a vacuum induction furnace, the steps of which are as follows:

[0026] a. Update the pump oil in the vacuum pump;

[0027] b. Preheating the diffusion pump;

[0028] c. Put the industrial pure iron to be smelted and the carbon particles whose weight is 0.0055-0.0065% of the industrial pure iron to be smelted into the CaO crucible, and the CaO crucible is inclined to one side by 10°-20°;

[0029] d. When the diffusion pump is preheated for 35 minutes, turn on the mechanical pump to pump air;

[0030] e. Turn on the Roots pump when the vacuum reaches 266Pa, and at the same time, the induction coil is energized, and the power is adjusted to ≤10kW;

[0031] f. Turn on the diffusion pump when the vacuum reaches ≤15Pa, and adjust the power of the induction coil to 10-25kW;

[0032] g. After 10 minutes since the diffusion pump is turned on, the power of the induction coil is adjusted to 30-40kW;

[0033] h. After another 9-11 min...

Embodiment 2

[0041] In the solution described in Example 1, the CaO crucible is inclined to one side by 14°-16°. Example 3

[0042] In the solution described in Example 2, the weight of the carbon particles is 0.0059-0.0061% of the weight of the industrial pure iron to be smelted.

Embodiment 4

[0044] In the scheme described in Example 3, the weight of the carbon particles is 0.006% of the weight of the industrial pure iron to be smelted.

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Abstract

The invention relates to a method for smelting high-purity steel through a vacuum induction furnace. The method comprises the following steps of: replacing vacuum pump oil; preheating a diffusion pump; placing industrial pure iron to be smelted and carbon particles into a CaO crucible which tilts towards one side; preheating the diffusion pump for 35 minutes and then beginning to suck air; starting a Roots pump when vacuum degree reaches 266Pa and electrifying an induction coil at power of 10kW; starting the diffusion pump when the vacuum degree is less than or equal to 15Pa and adjusting thepower to 20kW; gradually increasing the power to 60kW; adjusting the power to 50kW, closing the diffusion pump and meanwhile adding ferrous silicon into the crucible in 10 minutes after iron is smelted; closing the Roots pump and a mechanical pump after 10 minutes and filling argon at the same time; adding Mn alloy after 2 minutes; powering down the induction coil after 2 minutes; and standing for 3 minutes and then tapping steel. By adopting the method, degasification is facilitated, oxygen supply is reduced, a preliminary deoxidation effect is guaranteed, and aluminum content, sulfur content and impurities are reduced, so that total content of carbon, nitrogen, oxygen, sulfur, hydrogen and acid-soluble aluminum in the smelted steel does not exceed 100ppm.

Description

technical field [0001] The invention relates to a method for smelting high-purity steel, in particular to a method for smelting high-purity steel in a vacuum induction furnace. Background technique [0002] The market demand for high-purity steel is increasing, and its purity index is also getting higher and higher. It is often required that the total content of carbon, nitrogen, oxygen, sulfur, hydrogen, and acid-melted aluminum in the steel should not exceed 100ppm. The existing technology can reduce certain elements in the steel to a lower level respectively, but cannot reduce the content of carbon, nitrogen, oxygen, sulfur, hydrogen, and acid-melted aluminum to a lower level at the same time, that is, the above six elements in the steel The sum of the content in it generally exceeds 100ppm. Therefore, it is necessary to design a method for smelting high-purity steel in a vacuum induction furnace that can ensure that the total content of carbon, nitrogen, oxygen, sulfur,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/04C22C33/04
CPCY02P10/25
Inventor 孙伟陈子宏董中波王建民曹同友吴杰蒋扬虎袁伟霞
Owner 武钢集团有限公司
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