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A treatment method for insertion tube blockage

A processing method and a technology of inserting tubes, which are applied in the field of steelmaking technology, can solve problems such as waste of refractory materials, high labor intensity, and increased production costs, and achieve the effect of reducing refractory material consumption, reducing frequent replacement, and ensuring smooth progress

Active 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

[0003] During the RH production process, due to factors such as molten steel temperature, spraying of the insertion tube, and cleanliness of the molten steel, the insertion tube may be blocked
However, once the insertion tube is blocked, it can only be treated by manual burning of oxygen in the past, which not only takes a long time and is labor-intensive; but also the treatment effect is extremely unstable, and it cannot even be disposed of.
For insertion tubes that cannot be removed due to blockages, new insertion tubes have to be replaced, resulting in waste of refractory materials and directly increasing production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, use the RH vacuum chamber whose insertion tube has been blocked to continue to produce molten steel with a temperature greater than 1630°C and an oxygen content greater than 550ppm. Through the circulating flow of high-temperature high-oxygen molten steel in the insertion tube, the inclusions blocked on the inner wall of the insertion tube are washed away.

[0019] Secondly, strictly control the RH refining process system, control the vacuum degree of the vacuum chamber at 10kPa, and control the lifting gas flow rate at 120Nm 3 / h, after circulating for 15 minutes in the molten steel boiling state, the refining is stopped, and the molten steel out of the station is hoisted to the ladle refining furnace (ie LF furnace) refining station for refining, and then poured on the casting machine.

Embodiment 2

[0021] First, use the RH vacuum chamber whose insertion tube has been blocked to continue to produce high-temperature and high-oxygen molten steel with a temperature greater than 1640 ° C and an oxygen content greater than 600 ppm. Through the circulation of high-temperature and high-oxygen molten steel in the insertion tube, the blockage will be removed Wall inclusions are washed away.

[0022] Secondly, strictly control the RH refining process system, control the vacuum degree of the vacuum chamber at 6kPa, and control the flow rate of the lifting gas at 150Nm 3 / h, after circulating for 11 minutes under the boiling state of molten steel, stop the refining, lift the molten steel out of the station to the LF furnace for refining, and then put it on the continuous casting machine for pouring.

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Abstract

The invention relates to a handling method for blockage of an insertion tube. In the method, high-temperature and high-oxygen-content molten steel at the temperature of more than 1,620 DEG C and with oxygen content of more than 500ppm is produced by using a vacuum cycle degassing furnace, namely an RH (Ruhrstahl Heraeus) vacuum chamber, with a blocked insertion tube; RH refining process is controlled; and inclusions blocked at the inner wall of the insertion tube are scoured away through circular flow of the high-temperature and high-oxygen molten steel in the insertion tube. Thus, unplanned offline of the vacuum chamber and frequent replacement of the insertion tube caused by blockage of the insertion tube are reduced, the service cycle of the insertion tube is prolonged, the consumptionof a refractory material is reduced, the production cost is reduced, online handling of the blockage of the insertion tube of the vacuum chamber is realized, and smooth production is guaranteed.

Description

technical field [0001] The invention belongs to the field of steelmaking technology, and in particular relates to a treatment method for clogging of an insertion pipe of a vacuum circulation degassing furnace (abbreviated as RH). Background technique [0002] The RH insertion tube as the channel of molten steel is an important part of the RH vacuum chamber equipment. During the refining process of RH molten steel, if the insertion tube is blocked by steel slag or inclusions, the refining process of molten steel will be directly interrupted. [0003] During the RH production process, due to factors such as molten steel temperature, gunning of the insertion tube, and cleanliness of the molten steel, the insertion tube may be blocked. Once the insertion tube is blocked, it can only be treated by manual burning of oxygen in the past, which not only takes a long time and is labor-intensive, but also the treatment effect is extremely unstable, and it cannot even be disposed of. F...

Claims

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Application Information

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IPC IPC(8): C21C7/10
Inventor 吴世龙陈明毛志勇刘伟孟宪娟孙艳霞
Owner ANGANG STEEL CO LTD
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