Method for removing impurities by argon blowing by adopting continuous casting tundish air curtain barricade technology

A technology of continuous casting tundish and gas curtain retaining wall, applied in the field of metallurgical technology of continuous casting tundish of iron and steel metallurgy, can solve the problems of complex production process, influence removal of inclusions, low inclusion removal rate, etc. Metallurgical effect highlights the effect

Active Publication Date: 2017-11-17
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strip-shaped air curtain retaining wall produced by the existing technology has become a key technical problem restricting the popularization and application of this technology due to the low removal rate of inclusions. The main defects or deficiencies: (1) The strip-shaped air curtain retaining wall in the tundish The upper molten steel level is prone to fluctuations, making the molten steel exposed to cause secondary oxidation of the molten steel, and the argon bubbles drive the inclusions to float to the liquid surface of the tundish molten steel, but are not absorbed by the tundish slag in time, which affects the effect of removing inclusions; (2) The blind end length of the air curtain retaining wall produced by the prior art is 90-100mm, and the length of the fixed sleeve end is 120-150mm, because the blind end of the air curtain retaining wall and the end of the fixed sleeve cannot form argon bubbles. Screen barrier, so it affects the effect of removing inclusions
Insufficiency of the patented technology: the metallurgical effect of removing inclusions is not obvious
The disadvantages of this patented technology: the production process is complicated, the cost is high, the gas volume is small, and a continuous and dense argon bubble air curtain barrier cannot be formed, which affects the metallurgical effect of removing non-metallic inclusions in molten steel

Method used

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  • Method for removing impurities by argon blowing by adopting continuous casting tundish air curtain barricade technology
  • Method for removing impurities by argon blowing by adopting continuous casting tundish air curtain barricade technology
  • Method for removing impurities by argon blowing by adopting continuous casting tundish air curtain barricade technology

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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a method for removing inclusions by blowing argon on a continuous casting tundish gas curtain wall, used for pouring and producing low carbon steel, includes the following steps:

[0033] 1) While the continuous casting ladle is pouring, argon is blown into the strip gas curtain wall. The initial argon flow is 30NL / min and the pressure is 0.25Mpa. When the molten steel in the tundish reaches the normal molten steel level, adjust The flow rate of large argon gas is 50NL / min, and it is advisable to slightly fluctuate the molten steel level in the area directly above the strip gas curtain wall;

[0034] 2) In the first furnace of the tundish pouring, after the molten steel level in the tundish overflows the ladle nozzle, add 50kg of high-alkalinity and low-carbon tundish covering agent from the molten steel injection area in the tundish. Add 20kg of high-alkalinity and low-carbon tundish covering agent to the molten steel surface in the upper area, a...

Embodiment 2

[0039] The method for removing inclusions by blowing argon on the continuous casting tundish gas curtain wall as described in Example 1, the difference is:

[0040] A method for removing inclusions by blowing argon on a continuous casting tundish gas curtain wall, used for pouring and producing low carbon steel, includes the following steps:

[0041] 1) While the continuous casting ladle is pouring, argon is blown into the strip gas curtain wall. The initial argon flow is 50NL / min and the pressure is 0.5Mpa. When the molten steel in the tundish reaches the normal molten steel level, adjust The large argon gas flow rate is 100NL / min, and the argon gas flow rate should be controlled according to the slight fluctuation of the molten steel level in the area directly above the strip gas curtain wall;

[0042] 2) In the first furnace of the tundish pouring, after the molten steel level in the tundish overflows the nozzle of the large ladle, add 30kg of high-alkalinity and low-carbon tundis...

Embodiment 3

[0046] The method for removing inclusions by blowing argon on the continuous casting tundish gas curtain wall as described in Example 1, the difference is:

[0047] A method for removing inclusions by blowing argon on a continuous casting tundish gas curtain wall, used for pouring and producing low carbon steel, includes the following steps:

[0048] 1) While the continuous casting ladle is being poured, argon is blown into the strip-shaped gas curtain wall. The initial argon flow is 40NL / min and the pressure is 0.4Mpa. When the molten steel in the tundish reaches the normal molten steel level, adjust The large argon gas flow rate is 80NL / min, and the argon gas flow rate should be controlled by the slight fluctuation of the molten steel level in the area directly above the strip gas curtain wall;

[0049] 2) In the first furnace of the tundish pouring, after the molten steel in the tundish overflows the nozzle of the large ladle, add 80kg of the high-alkalinity and low-carbon tundish...

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Abstract

The invention relates to a method for removing impurities by argon blowing by adopting a continuous casting tundish air curtain barricade technology. According to the method, a proper amount of high-alkalinity low-carbon tundish covering agent and the high-alkalinity low-carbon tundish covering agent with carbonized rice husks are added to each furnace on the liquid surface of molten steel in a region right above a strip-shaped air curtain barricade correspondingly according to low-carbon steel and non-low-carbon steel, and therefore the problem that the liquid surface fluctuation of the molten steel caused by argon blowing of the strip-shaped air curtain barricade is large can be solved, and the problem of secondary oxidation and slag entrapment of the molten steel can be more effectively prevented; and in addition, argon bubbles capture the impurities and float upwards to the tundish liquid surface to be adsorbed and more effectively removed by the high-alkalinity low-carbon tundish covering agent, and therefore the metallurgical effect of removing the impurities by argon blowing of the continuous casting tundish strip-shaped air curtain barricade can be improved.

Description

Technical field [0001] The invention relates to a method for removing inclusions by blowing argon on a continuous casting tundish gas curtain wall, and belongs to the technical field of steel metallurgy continuous casting tundish metallurgy technology. Background technique [0002] The continuous casting tundish gas curtain wall technology is a new technology developed at the end of the 20th century to remove non-metallic inclusions in the molten steel. The principle is to use a strip-shaped gas curtain wall perpendicular to the flow direction of the molten steel to be placed in the tundish At an optimal position at the bottom, blow in argon gas, and argon gas floats through the gas curtain wall to form an argon bubble gas curtain barrier, which has the function of promoting the floating and removal of non-metallic inclusions in the molten steel. However, the strip-shaped air curtain wall produced by the prior art has become a key technical problem restricting the popularization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/117
CPCB22D11/117
Inventor 武光君
Owner SHANDONG IRON & STEEL CO LTD
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