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A method for avoiding molten steel splashing in the refining process

A refining process and molten steel technology, applied in the field of steelmaking refining process, can solve the problems of unfavorable molten steel refining process, burning out the top gun device, unsatisfactory effect, etc., to prevent clogging and top gun burning accidents, reduce splash, easy-to-control effects

Inactive Publication Date: 2011-12-28
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the vast majority of steelmaking plants have adopted the RH molten steel refining technology, and in the RH molten steel refining process, if the carbon content in the molten steel is high and the oxygen content is also high, in the initial stage of vacuum refining, the molten steel The carbon-oxygen reaction will be very violent, so the molten steel will have a large splash in the vacuum chamber. In severe cases, it will even block the feeding port, burn out the top gun device, etc., which will have a very adverse effect on the molten steel refining process.
[0003] So far, there is no specific solution to the problem of molten steel splashing during the refining process of RH molten steel. Only the method of reducing the lifting gas flow rate in process control can reduce the splashing, but the effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The tonnage of RH refining is 250t.

[0016] 1. Pressure control in the vacuum chamber:

[0017] First, set the target pressure to 18kPa through the pressure control device, then slowly reduce the pressure in the vacuum chamber, set the target pressure to 8kPa after decarburization for 5 minutes, control the intensity of the decarburization reaction, cancel the pressure control after 10 minutes of decarburization, and carry out no pressure refining.

[0018] 2. Addition of deoxidized aluminum:

[0019] When the molten steel still splashes after adopting the above method of controlling the pressure in the vacuum chamber, add 10kg of aluminum to the molten steel to quickly reduce the oxygen content of the molten steel in the vacuum chamber and reduce the splashing of the molten steel.

Embodiment 2

[0021] The tonnage of RH refining is 250t.

[0022] 1. Pressure control in the vacuum chamber:

[0023] First, set the target pressure to 22kPa through the pressure control device, then slowly reduce the pressure in the vacuum chamber, set the target pressure to 12kPa after decarburization for 5 minutes, control the intensity of the decarburization reaction, cancel the pressure control after 10 minutes of decarburization, and carry out no pressure refining.

[0024] 2. Addition of deoxidized aluminum:

[0025] When the molten steel still splashes after adopting the above method of controlling the pressure in the vacuum chamber, add 25kg of aluminum to the molten steel to quickly reduce the oxygen content of the molten steel in the vacuum chamber and reduce the splashing of the molten steel.

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Abstract

The invention provides a method for avoiding molten steel splashing in the refining process, which is to slowly reduce the pressure in the vacuum chamber and set the target pressure of the pressure control device to 18-22kPa during the refining process of the vacuum circulation degassing furnace (RH molten steel) After 5 minutes of decarburization, set the target pressure to 8-12kPa, and cancel the pressure control after 10 minutes of decarburization; when there is still splashing, add aluminum at a rate of 0.04-0.10kg per ton of steel to quickly reduce the oxygen content of molten steel in the vacuum chamber quantity. Thereby effectively reducing the splashing of molten steel in the vacuum chamber, preventing the blockage of the discharge port of the vacuum chamber and the burnout accident of the top gun caused by the splashing of molten steel, and ensuring the smooth progress of RH refining production. The method of the invention is simple, easy to operate, easy to control, and has less investment and quick effect.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and refining technology, and in particular relates to a method for preventing molten steel from splashing during the refining process of a vacuum circulation degassing furnace (abbreviated as RH). Background technique [0002] At present, the vast majority of steelmaking plants have adopted the RH molten steel refining technology, and in the RH molten steel refining process, if the carbon content in the molten steel is high and the oxygen content is also high, in the initial stage of vacuum refining, the molten steel The carbon-oxygen reaction will be very violent, so the molten steel will have a large splash in the vacuum chamber. In severe cases, it will even block the feeding port, burn out the top gun device, etc., which will have a very adverse effect on the molten steel refining process. [0003] So far, there is no specific solution to the problem of molten steel spattering in the RH mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/06C21C7/068
Inventor 吴世龙陈明毛志勇刘伟孟宪娟孙艳霞
Owner ANGANG STEEL CO LTD