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Improved circulation type molten steel vacuum refining method and device

A vacuum refining and circulating technology, which is applied in the field of improved circulating molten steel vacuum degassing refining method, smelting and molten ferroalloy processing, can solve the problem of not being able to effectively improve the removal efficiency of inclusions in steel and meet the requirements of Increase the treatment of steel types and other issues to achieve the effects of increased probability, reduced air bubbles and inclusions, and improved efficiency

Inactive Publication Date: 2006-01-11
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the circulation flow rate of the RH vacuum degassing system, there have been many plans to change the structure and cross-sectional shape of the riser and downcomer. However, the method of simply increasing the circulation flow rate of molten steel cannot effectively improve the removal efficiency of inclusions in steel. , nor can it better meet the requirements of increasing steel types and improving steel quality

Method used

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  • Improved circulation type molten steel vacuum refining method and device
  • Improved circulation type molten steel vacuum refining method and device
  • Improved circulation type molten steel vacuum refining method and device

Examples

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Embodiment 1

[0022] Embodiment 1: Improved circulation type molten steel vacuum refining method and device with electromagnetic stirrer

[0023] Such as figure 2 As shown, outside the rising tube 2 of the vacuum chamber 1 of the existing RH, a water-cooled electromagnetic winding 6 fixed to the outer wall of the rising tube is installed. So that the electromagnetic force can drive the molten steel to do vortex motion. Generally, the electromagnetic stirrer is suitable for the riser with an inner diameter of less than 600 mm, and the magnetic induction intensity of the corresponding electromagnetic field is 0.1-0.2 Tes (Tesla).

[0024] Use method of the present invention to carry out vacuum refining process to 120 tons of ladle 5 in certain steel factory. The riser and downcomer 3 of the device have a diameter of 500 mm, and the vacuum chamber is pressed on the ladle so that the riser and the downcomer are immersed in the ladle, and the vacuum pump is started to evacuate. When the press...

Embodiment 2

[0025] Embodiment 2: Improved circulation type molten steel vacuum refining method and device with mechanical agitator

[0026] The method and device are suitable for RH devices with an internal diameter of the riser tube of more than 600 mm. Adopt existing RH molten steel vacuum treatment device, according to such as image 3 The design shown is modified; a speed-regulating motor is placed on the upper cover of the vacuum chamber 1, and a rotating shaft 7 vertically inserted into the riser 2 is connected, and two impellers 8 are fixed on the shaft.

[0027] The impeller is detachable and is assembled from a wheel seat 9 and blades 10, such as Figure 5 shown. The mechanical stirrer of the present invention is equipped with three kinds of impellers. (1) if Figure 5 For the impeller with three blades shown in a, the plane of the blades is parallel to the busbar of the wheel seat, that is, the installation angle is 0°; (2) Figure 5 For the impeller with four blades shown ...

Embodiment 3

[0029] Embodiment 3: Improved circulation type molten steel vacuum refining method and device with composite stirrer

[0030] according to Figure 4 According to the design plan to transform the RH molten steel vacuum treatment device, a speed-regulating motor is installed on the cover of the vacuum chamber 1, and a rotating shaft 7 inserted vertically downward into the riser 2 is connected, and two impellers 8 are fixed on the shaft, each Five blades 10 are installed on the wheel seat 9 of the impeller, as Figure 5 As shown in c, the installation angle of the blade is 45°. A 0.1 t water-cooled electromagnetic winding is installed outside the riser tube.

[0031] When vacuum refining a 180 ton ladle, the inner diameter of the riser and downcomer is designed to be 600mm. Press the vacuum chamber onto the ladle 5, start the vacuum pump to evacuate, and when the pressure of the vacuum chamber drops to 1 torr, the molten steel begins to circulate in the ascending pipe and the ...

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Abstract

An improved circulation-type vacuum refining method for molten steel includes such steps as sucking the molten steel upward from ladle to vacuum chamber via up-flow pipe while applying an external force to said molten steel to make it rotate in the up-flow pipe, blowing argon gas, and flowing back to the ladle via down-flow pipe. Its refining apparatus is composed of vacuum chamber, up-flow pipe, down-flow pipe, gas nozzle and molten steel stirrer.

Description

technical field [0001] The invention belongs to the technical field of smelting of carbon steel and processing of molten ferroalloy, especially the technical field of vacuum treatment, and proposes an improved circulation type molten steel vacuum degassing and refining method. Background technique [0002] In recent years, due to the increasingly stringent requirements for steel quality in industries such as automobiles and petroleum, some high-performance steels have to strictly control the content and shape of inclusions, and even began to seek how to remove non-metallic metals in molten steel. Inclusions A method of producing pure steel. [0003] RH (Rheinstahl Hutte-Werke&Heraeus GMBK) circular vacuum refining method is one of the effective processes for producing pure steel. It is connected with the ladle through a vacuum chamber with two pipes installed in the lower part and an argon blowing device. When the two tubes at the lower part of the vacuum chamber are inser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/072C21C7/10
Inventor 李宝宽齐凤升
Owner NORTHEASTERN UNIV
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