Method of removing impurity from molten steel

An inclusion and small technology, applied in the field of iron and steel metallurgy, can solve the problems such as the generation method of dispersing tiny bubbles that is not proposed, and achieve the effects of low cost, high removal efficiency, and simple and easy operation.

Inactive Publication Date: 2011-04-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the literature did not propose a feasible method for the generation of dispersed micro-bubbles.

Method used

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  • Method of removing impurity from molten steel
  • Method of removing impurity from molten steel
  • Method of removing impurity from molten steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In this embodiment, the position of the through hole 2 of the shroud for metallurgy in the tundish is 100 mm from the top of the shroud, the number of the through hole 2 is 1, the diameter of the hole located on the inner wall of the shroud is 10 mm, and the length is 10 mm, and the hole located on the outer wall of the shroud The diameter is 20mm, the axial direction of the through hole and the axial direction of the upper long nozzle form an included angle of 10°, the outer diameter of the front part of the joint 5 is 20mm, and the inner diameter is 10mm.

[0017] A two-strand slab continuous casting machine is used, the section of the cast slab is 1150×230mm, and the casting speed is 1.2m / min. Argon gas is blown into the shroud through the external delivery pipe 6, the gas supply pressure is 2 atm, and the flow rate is 25 l / min. The argon gas is fully dispersed by the stream in the shroud, and a large number of dispersed micro-bubbles are generated in the tundish, an...

Embodiment 2

[0019] In this embodiment, the position of the through hole 2 of the shroud for metallurgy in the tundish is 160 mm from the top of the shroud, and the number of the through holes 2 is 2, distributed along the radial direction of the shroud, and the angle between the two through holes 2 is 180°. The diameter of the hole located on the inner wall of the shroud is 8 mm, and the length is 12 mm. The diameter of the hole located on the outer wall of the shroud is 30 mm. 30mm with an inner diameter of 25mm.

[0020] A two-strand slab continuous casting machine is used, the section of the cast slab is 1150×230mm, and the casting speed is 1.2m / min. Argon gas is blown into the shroud through the external delivery pipe 6, the gas supply pressure is 6 atm, and the flow rate is 300 l / min. The argon gas is fully dispersed by the stream in the shroud, and a large number of dispersed micro-bubbles are generated in the tundish, and the size of the bubbles is less than 0.8mm. The T[O] of th...

Embodiment 3

[0022] In this embodiment, the number of shroud through-holes 2 for metallurgy in the tundish is six, which are asymmetrically and arbitrarily distributed along the shroud space. The position of the uppermost through hole 2 is 80mm from the top of the long nozzle, and the position of the lowermost through hole 2 is 500mm from the top of the nozzle. The hole located on the inner wall of the shroud has a diameter of 25 mm and a length of 0 mm, and the hole located on the outer wall of the shroud has a diameter of 25 mm and a length of 60 mm. The axial direction of the through hole 2 forms an included angle of 40° with the axial direction of the upper part of the shroud, and the outer diameter of the front part of the joint 5 is 25 mm, and the inner diameter is 14 mm.

[0023] A two-strand slab continuous casting machine is used, the section of the cast slab is 1150×230mm, and the casting speed is 1.2m / min. Argon gas is blown into the shroud through the external delivery pipe 6,...

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Abstract

The invention provides a method of removing impurity from molten steel and is characterized by: on the wall of tundish metallurgical long outlet upper potion, forming a through hole whose axial direction forms an angle of 10 to 90 DEG with the axial direction of outlet upper portion, connecting the through hole with gas source through a joint connected with an external conveyer pipe, during continuous casting, through the external conveyer pipe blowing into the long outlet with inert gas with a gas flow of 3 to 300 l / min and an air pressure of 1.0 to 10 atm; or through the external conveyer pipe and long outlet, using powder-sending equipment to blow into molten steel with carbonate powder or various synthesis slag powder with a granularity of 0.1 to 3 mm, the carriers being inert gas Ar or N2 with a gas flow of 3 to 400 l / min and an air pressure of 1.0 to 15 atm. The invention is advantageous by easy operation, low costs and high impurity removing efficiency; it is in favor of alleviating outlet obstruction caused by tundish intrusion and forms inert atmosphere over tundish to protect molten steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, relates to tundish metallurgy technology, and in particular to a method for realizing the removal of fine inclusions in a tundish. Background technique [0002] In recent years, due to the progress of ladle refining technology and continuous casting technology, the content of oxide-based non-metallic inclusions has been reduced, so that molten steel with excellent cleanliness can be produced. However, due to the use of steel and the harsh conditions of use, the requirements for inclusions in steel are more stringent. The harm of inclusions to steel is mainly related to the quantity and size of inclusions. To control the quality of inclusions, the most important thing is to control the quantity and size of inclusions. Due to different steel types and smelting cost constraints, the requirements for inclusions are also different. For ordinary steel, the total oxygen is 50ppm, and ...

Claims

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Application Information

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IPC IPC(8): B22D11/117
Inventor 唐复平李镇王晓峰刘万山任子平陈明王文仲孟劲松温铁光姜振生吴春杰陈本文康伟金学峰栗红李海滨林洋苏毅费鹏孙群袁皓孙涛王向辉
Owner ANGANG STEEL CO LTD
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