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Refining furnace dehydrogenation method

A refining furnace and dehydrogenation technology, applied in the field of refining furnace dehydrogenation, can solve the problems of inability to use RH furnace for dehydrogenation, affecting the dehydrogenation effect, and slag on the surface of molten steel.

Inactive Publication Date: 2011-06-15
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the current process uses VD furnace or RH furnace for dehydrogenation. The disadvantage of VD method is that there is slag on the surface of molten steel, which offsets the suction of vacuum and affects the final dehydrogenation effect. The hydrogen content at the end point is 1.2ppm-2.0ppm
In addition, although the dehydrogenation effect of the RH furnace is better than that of the single nozzle refining furnace, the RH furnace cannot be used for dehydrogenation on high alloy steel or stainless steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The type of steel smelted in this embodiment is P20HL, 90t ladle, and the smelting process route of this steel is converter→LF→single nozzle refining furnace→CCM. Adjust the temperature and composition of the molten steel to the target content before the molten steel enters the single nozzle refining furnace for treatment.

[0027] The initial conditions of the single nozzle refining furnace are: molten steel temperature 1611°C, vertical distance from the free space of the ladle (that is, the vertical distance from the slag surface to the upper edge of the ladle) 450mm, the thickness of the slag layer is 100mm, and the weight of molten steel is 80.75t.

[0028] The weight percentage ratio of the molten steel components before treatment in the single nozzle refining furnace is:

[0029] C 0.30%; Si 0.47%; Mn 0.87%; P 0.012%;

[0030] S 0.0056%; Al 0.03%; H 4.7ppm

[0031] The rest is Fe and unavoidable impurities.

[0032] The embodiment steps of the method for this r...

Embodiment 2

[0043] The type of steel smelted in this embodiment is P265GH, 90t ladle, and the smelting process route of this steel is converter→LF→single nozzle refining furnace→CCM. Adjust the temperature and composition of the molten steel to the target content before the molten steel enters the single nozzle refining furnace for treatment.

[0044] The initial conditions of the single-nozzle refining furnace are: molten steel temperature 1654°C, vertical distance from the free space of the ladle (that is, the vertical distance from the slag surface to the upper edge of the ladle) is 400mm, the thickness of the slag layer is 100mm, and the weight of molten steel is 84.7t.

[0045] The weight percentage ratio of the molten steel components before treatment in the single nozzle refining furnace is:

[0046] C 0.155%; Si 0.25%; Mn 1.29%; P 0.015%;

[0047] S 0.0063%; Al 0.03%; H 5.4ppm

[0048] The rest is Fe and unavoidable impurities.

[0049] The steps of the method embodiment of thi...

Embodiment 3

[0060] The type of steel smelted in this embodiment is 718HL, 90t ladle, and the smelting process route of this steel is converter→LF→single nozzle refining furnace→CCM. Adjust the temperature and composition of the molten steel to the target content before the molten steel enters the single nozzle refining furnace for treatment.

[0061] The initial conditions of the single-nozzle refining furnace are: molten steel temperature 1601°C, vertical distance from the free space of the ladle (that is, the vertical distance from the slag surface to the upper edge of the ladle) 450mm, the thickness of the slag layer is 90mm, and the weight of molten steel is 81.9t.

[0062] The weight percentage ratio of the molten steel components before treatment in the single nozzle refining furnace is:

[0063] C 0.33%; Si 0.24%; Mn 1.34%; P 0.009%;

[0064] S 0.005%; Al 0.078%; H 6.2ppm;

[0065] The rest is Fe and unavoidable impurities.

[0066] The steps of the method embodiment of this ref...

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Abstract

The invention relates to a refining furnace dehydrogenation method. The method comprises the following steps: 1) a ladle is opened to a hydraulic lifting position, the ladle is jacked, an insertion tube is inserted, bottom blowing argon is performed, the stirring intensity is 3-5L / (min.t), vacuumizing is performed to ensure that the vacuum degree is reduced to less than 2mbar in 3-5 minutes, molten steel is sucked in the vacuum chamber of a single-burner refining furnace; 2) vacuumizing is completed in 3-5 minutes to ensure that the vacuum degree is no more than 2mbar; 3) before the dehydrogenation of molten steel, alloying is performed according to the component requirements of different steels, and alloy is added to ensure that the component weight percentages of molten steel meet the requirements of the steel finished product; 4) dehydrogenation is performed, wherein the vacuum degree remains no more than 2mbar in no less than 15min; and 5) bottom blowing argon is stopped, and when molten steel is in a rest state after 2min, the vacuum valve is opened to break vacuum. The refining furnace dehydrogenation method has high dehydrogenation rate and the hydrogen content of molten steel can be reduced to 0ppm-1.5ppm. Therefore, the dehydrogenation rate is 70%-90%.

Description

technical field [0001] The invention relates to a method for dehydrogenating a refining furnace. Background technique [0002] Hydrogen in steel is the main cause of white spots, shrinkage cavities, cracks and various types of bubbles. The solid solubility of hydrogen in steel is only a few parts per million to a dozen or so. When hydrogen exceeds the solid solubility in steel, bubbles will form during the solidification process of steel. When it is serious, it will cause the steel ingot to rise; when it is light, it will extend during hot working to form a small amount of fine cracks, that is, white spots. The existence of these defects will seriously reduce the strength, impact toughness, reduction of area and elongation of the steel, seriously affecting the steel the quality of. In the production of high-grade pipeline steel and nuclear power stainless steel, there are strict requirements on the hydrogen content in steel. For this reason, it is required that the hydrog...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/072
Inventor 侯东涛陈泽民
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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