Refining device and vacuum refining process for use in non-oriented silicon steel production

A technology of oriented silicon steel and refining equipment, which is applied in the field of steelmaking and refining, can solve the problems of limiting the performance of silicon steel products and high sulfur content, and achieve the effects of reducing production costs and improving production efficiency

Inactive Publication Date: 2010-10-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since non-oriented silicon steel is produced by converter-RH refining process, there is no post-furnace refining desulfurization measure (except for RH-KTB), resulting in high sulfur content in the finished steel, generally around 0.0045%, which limits the performance of silicon steel products. Further improve

Method used

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  • Refining device and vacuum refining process for use in non-oriented silicon steel production
  • Refining device and vacuum refining process for use in non-oriented silicon steel production

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] Using the refining device for the production of non-oriented silicon steel, adopt the vacuum refining process described in the present invention to produce non-oriented silicon steel W600

[0033] (1) Control the carbon content in the steel at 0.03-0.04% when tapping the converter, and the dissolved oxygen in the steel is greater than 600ppm.

[0034] (2) The VD vacuum chamber 2 uses forced oxygen blowing to decarburize, reducing the carbon in the steel to below 0.0025%.

[0035] (3) After decarburization finishes, add ferrosilicon, Al, lime and other slag materials in ladle 1 through line feeding device 6, adjust [Si], [Al] content in molten steel to target value, and control the content of slag in slag (FeO+MnO)≤1.0%.

[0036] (4) After the ladle is covered, vacuum is started, and at the same time, argon gas is blown in three ways from the breathable brick at the bottom of the ladle for stirring. The argon flow rate of each channel is 600Nl / min, and the total flow r...

Embodiment 2

[0040] The non-oriented silicon steel W800 is produced by using the refining device for producing non-oriented silicon steel and adopting the vacuum refining process described in the present invention.

[0041] (1) Control the carbon content in the steel at 0.03-0.04% when the converter is tapping the steel, and the dissolved oxygen in the steel is greater than 600ppm.

[0042] (2) The VD vacuum chamber 2 uses forced oxygen blowing to decarburize, reducing the carbon in the steel to 0.0020%.

[0043] (3) After decarburization finishes, add ferrosilicon, Al, lime and other slag materials in ladle 1 through line feeding device 6, adjust [Si], [Al] content in molten steel to target value, and control the content of slag in slag (FeO+MnO)≤0.8%.

[0044] (4) After the ladle is covered, vacuum is started, and at the same time, argon gas is blown into 3 ways from the breathable brick at the bottom of the ladle for stirring. The argon flow rate of each channel is 600Nl / min, and the ...

Embodiment 3

[0047] Using the refining device for the production of non-oriented silicon steel, adopt the vacuum refining process described in the present invention to produce non-oriented silicon steel W500

[0048] (1) Control the carbon content in the steel at 0.04-0.05% when tapping the converter, and the dissolved oxygen in the steel is greater than 600ppm.

[0049] (2) The VD vacuum chamber 2 uses forced oxygen blowing to decarburize, reducing the carbon in the steel to below 0.0030%.

[0050] (3) After decarburization finishes, add ferrosilicon, Al, lime and other slag materials in ladle 1 through line feeding device 6, adjust [Si], [Al] content in molten steel to target value, and control the content of slag in slag (FeO+MnO)≤1.0%. (4) After the ladle is covered, vacuum is started, and at the same time, argon gas is blown in three ways from the breathable brick at the bottom of the ladle for stirring. The argon flow rate of each channel is 600Nl / min, and the total flow rate can r...

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Abstract

The invention provides a refining device and a vacuum refining process for use in non-oriented silicon steel production, which belong to the technical field of steel refining. The refining device comprises a ladle, a VD vacuum chamber, a vacuum cover trolley, an alloy inlet, a coolant inlet, a coolant bin, an alloy bin and a vacuum pump, wherein the ladle is provided with a ladle cover on the top and a plurality of breathable bricks at the bottom; the two ends of the vacuum chamber cover trolley are provided with wire feeding devices; an oxygen blowing device is arranged on the vacuum chamber cover trolley; and the oxygen blowing opening is led to the inside of the ladle from the ladle cover directly. The refining device can meet the requirements for synchronous external decarburization, desulfuration and denitrification in non-oriented silicon steel production, reduce production cost and obviously improve production efficiency. When the novel external refining device is used in non-oriented silicon steel production, molten water blown in a converter is subjected to vacuum-oxygen decarbonization first at a VD station in a vacuum chamber to reduce carbon content to below 25ppm and then aluminum and slag are added into the molten steel in the ladle to perform high-efficiency desulfuration with forced stirring.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and refining, and relates to a non-oriented silicon steel production process and a device thereof, in particular to a refining device and a vacuum refining process for the production of non-oriented silicon steel. Background technique [0002] The iron loss of non-oriented silicon steel mainly depends on the content of carbon, silicon, sulfur, aluminum, oxygen and nitrogen in the steel, inclusions and the microstructure of the steel plate. C in non-oriented silicon steel is a harmful element. It can form interstitial solid solution with Fe, causing serious lattice distortion, causing large internal stress, and significantly reducing magnetic properties. Therefore, the C content in the finished product should be controlled below 0.003; sulfur is only The harmful element next to C, sulfur increases the iron loss and coercive force. The reason is that sulfur and manganese form fine manganese sulf...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/068C21C7/064
CPCY02P10/20
Inventor 王新华王万军黄福祥于会香
Owner UNIV OF SCI & TECH BEIJING
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