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Method for increasing usage times of ANS refining furnace dipping cover

The technology of dipping hood and refining furnace is applied in the field of refining process, which can solve the problems of low usage frequency, easy damage, and increased cost of refractory materials, and achieve the effects of reducing smelting cost, reducing the number of replacements, and reducing consumption.

Active Publication Date: 2017-05-24
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to volume stability, thermal shock stability, and poor corrosion resistance, the dipping hood is easily damaged during the production process, so the number of times it is used is low, and the average number of times it is used is only 30 times for each furnace produced. , resulting in frequent replacement of the dipping hood, which seriously affects the continuous production of the continuous casting machine and increases the cost of refractory materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Change the structure of the dipping hood. Lengthen the lower cover of the dipping hood by 300mm, shorten the upper cover by 300mm, and keep the total height of the dipping hood unchanged.

[0020] 2. Reduce the oxidation of top slag. After the molten steel tank enters the ANS refining position, according to the Als composition of 0.035% of the molten steel sample in the converter argon station, 0.15kg / ton of steel is added to the aluminum line section. After the aluminum line section is added, start blowing argon at the bottom of the ladle, and the flow rate of argon gas is 40m 3 / h, argon blowing time 3min.

[0021] 3. Shorten the immersion time of the lower cover of the dipping cover into molten steel. Change the original production process and adopt the process requirement that the lower cover of the dipping hood is not immersed in the molten steel to blow argon, that is, the original argon blowing in the molten steel tank for 3 minutes, and the net blowing of ...

Embodiment 2

[0023] 1. Change the structure of the dipping hood. Lengthen the lower cover of the dipping hood by 360mm, shorten the upper cover by 360mm, and keep the total height of the dipping hood unchanged.

[0024] 2. Reduce the oxidation of top slag. After the molten steel tank enters the ANS refining position, when the Als composition of the molten steel sample in the converter argon station is 0.02%, add 0.30kg / ton of steel in the aluminum line section. After the aluminum line section is added, start blowing argon at the bottom of the ladle, and the flow rate of argon gas is 60m 3 / h, argon blowing time 5min.

[0025] 3. Shorten the immersion time of the lower cover of the dipping cover into molten steel. Changing the original production process, adopting argon blowing under the dipping hood without immersing in molten steel, that is, blowing argon for 5 minutes in the molten steel tank before entering the station, blowing argon for 8 minutes after alloy addition or temperature ...

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PUM

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Abstract

The invention provides a method for increasing the usage times of an ANS refining furnace dipping cover. The method comprises: lengthening a lower cover of the dipping cover by 200-400mm, shortening an upper cover by 200-400mm, and keeping the total height of the dipping cover unchanged; when the Als content of an argon station is greater than 0.03%, adding 0.08-0.25kg of aluminum wire section in every ton of steel; increasing the addition amount of the aluminum wire section in every ton of steel by 0.08-0.12kg; and after adding the aluminum wire section, starting steel ladle bottom argon blowing, wherein the argon flow is 30-80m<3> / h, and the time is 3-5min. The lower cover of the dipping cover is dipped into molten steel to carry out argon blowing does not happen within the process time intervals that a ladle car gets in a station to carry out argon blowing for 3-5min and carry out net argon blowing for 5-8min. By using the method, the time that the dipping cover in every car is dipped into molten steel can be shortened by longer than 8min, and the usage times of the dipping cover are increased from 30 to 70, so that the consumption of the dipping cover can be greatly reduced, the smelting cost can be reduced, and the productivity of a continuous casting machine can be increased.

Description

technical field [0001] The invention belongs to the technical field of refining technology, and in particular relates to a method for increasing the number of times of use of an ANS refining furnace dipping cover. Background technique [0002] The ANS refining furnace uses a molten steel tank as a refining container. On the basis of blowing argon at the bottom of the molten steel tank, an impregnation hood is inserted on the surface of the molten steel. The slag is removed, and the ferroalloy is directly added to the molten steel from the immersion hood. The composition of the molten steel is fine-tuned. An oxygen lance is installed in the cover to blow oxygen to the molten steel, and at the same time add aluminum or ferrosilicon to the molten steel, and use the oxidation reaction to heat the equipment. ANS refining furnace has multiple functions such as oxygen blowing to raise temperature, removal of inclusions and fine adjustment of composition. [0003] The immersion hoo...

Claims

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Application Information

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IPC IPC(8): C21C7/04C21C7/072
CPCC21C7/0006C21C7/0075C21C7/04C21C7/072
Inventor 吕志勇于海岐苏小利王显库张宏亮王金辉费鹏赵雷
Owner ANGANG STEEL CO LTD