A method for obtaining the flow rate of argon blowing in a single furnace

A technology of argon blowing flow rate and argon gas flow rate, which is applied in the direction of liquid/fluid solid measurement, measurement flow rate/mass flow rate, measuring device, etc. It can solve the problem of inaccurate argon gas blowing volume, reduce slag inclusion defects, improve Product quality, to ensure the normal effect of liquid level fluctuations

Active Publication Date: 2021-08-17
SHOUGANG CORPORATION
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, in the casting process, a certain range of constant amount of argon is often used to pass through the entire furnace (all furnaces), but due to the different working conditions of a single furnace (single furnace), this extensive argon ventilation Injection method will lead to inaccurate amount of argon blowing into the furnace

Method used

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  • A method for obtaining the flow rate of argon blowing in a single furnace
  • A method for obtaining the flow rate of argon blowing in a single furnace
  • A method for obtaining the flow rate of argon blowing in a single furnace

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Experimental program
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Effect test

Embodiment 1

[0059] The TFe content of a heat of ultra-low carbon steel smelted after RH refining is measured as 1%, and the T.O content of the tundish is 15ppm. According to the calculation, the gas flow rate of argon blowing for a single heat is 9.95L / min, which is relatively large for the casting heat. Adjust the amount of argon blowing to 10L / min, the casting section is 230mm×1400mm, the casting speed is 1.4m / min, ultra-low carbon steel mold slag is used, the superheat is controlled at about 25°C-40°C, and the liquid level in the crystallizer can be seen during the casting process Stable, liquid level fluctuation ± 3mm ratio is good.

Embodiment 2

[0061] The TFe content measured at the end of the RH refining of a heat of ultra-low carbon steel is 6%, and the T.O content of the tundish is 25ppm. According to the calculation according to the formula, the gas flow rate of argon blowing in a single heat is 14.9L / min. Adjust the amount of argon blowing to 15L / min, the casting section is 230mm×1400mm, the casting speed is 1.3m / min, ultra-low carbon steel mold slag is used, the superheat is controlled at about 25°C-40°C, and the liquid level in the crystallizer can be seen during the casting process Stable, liquid level fluctuation ± 3mm ratio is good.

Embodiment 3

[0063] The TFe content measured at the end of RH refining of a certain heat of ultra-low carbon steel is 2.5%, and the T.O content of the tundish is 18ppm. According to the calculation according to the formula, the gas flow rate of argon blowing in a single heat is 20.5L / min, and the casting section is 230mm ×1400mm, casting speed 1.5m / min, using ultra-low carbon steel mold slag, the superheat is controlled at about 25°C-40°C, the liquid level in the crystallizer can be seen to be stable during the casting process, and the liquid level fluctuation ± 3mm ratio is good.

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Abstract

The invention relates to a method for obtaining the flow rate of argon blowing in a single heat. In the process of RH refining and continuous casting, the weight percentage content of total iron in the refining slag of a single heat and the concentration of total oxygen in ppm in continuous casting molten steel are measured. According to the The weight percent content of total iron and the ppm concentration of total oxygen are used to obtain the flow rate of argon blowing for a single furnace time; the mass percentage content of total iron is expressed in TFe, the ppm concentration of total oxygen is expressed in T. The argon flow rate is obtained by the following calculation formula: In the formula, Q is the argon blowing flow rate of a single furnace, and the unit is L / min, a and b are the minimum and maximum argon flow rates of the entire furnace, respectively, and the TFe is controlled to be 0 ‑6%, the control said T.O is 12‑30ppm.

Description

technical field [0001] The invention relates to a method for obtaining the flow rate of argon blowing in a single furnace, and belongs to the technical field of continuous casting. Background technique [0002] When casting ultra-low carbon steel (C<0.0030%), the clogging of the nozzle and the nodulation of the stopper rod head can be avoided by introducing argon gas, and a reasonable flow rate of argon gas can be used to form a gas film on the inner wall of the submerged nozzle, reducing The reaction between molten steel and refractory materials, thereby slowing down the Al 2 o 3 Aggregation of class inclusions. [0003] At present, in the casting process, a certain range of constant amount of argon is often used to pass through the entire furnace (all furnaces), but due to the different working conditions of a single furnace (single furnace), this extensive argon ventilation If the injection method is not used, the amount of argon gas injected into the furnace will b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072B22D41/58G01F1/00
CPCB22D41/58C21C7/072G01F1/00
Inventor 罗衍昭季晨曦邓小旋刘柏松张志敏刘延强李海波杨晓山王胜东潘宏伟何文远安泽秋赵长亮
Owner SHOUGANG CORPORATION
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