Method for obtaining single-heat argon blowing flow

A technology of argon blowing flow and argon gas flow, which is applied in liquid/fluid solid measurement, measurement flow/mass flow, measuring device, etc., can solve the problem of inaccurate argon blowing amount, reduce slag entrainment defects, improve Product quality, ensuring the effect of liquid level fluctuations

Active Publication Date: 2019-10-01
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • 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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  • Method for obtaining single-heat argon blowing flow
  • Method for obtaining single-heat argon blowing flow
  • Method for obtaining single-heat argon blowing flow

Examples

Experimental program
Comparison scheme
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 single-heat argon blowing flow. In the RH refining and continuous casting processes, the total iron weight percentage content in single-heat refining slag and the total oxygen ppm concentration in continuous casting molten steel are measured, and the single-heat argon blowing flow is obtained according to the total iron weight percentage content andthe total oxygen ppm concentration; the total iron mass percentage content is represented as TFe, and the total oxygen ppm concentration is represented as T.O; and the single-heat argon blowing flow is obtained according to the calculation formula detailed in the description, specifically, in the formula, Q is the single-heat argon blowing flow in L / min, a and b are respectively the minimum valueand the maximum value of the whole heat argon flow, the TFe is controlled to be 0-6%, and the T.O is controlled to be 12-30 ppm.

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 Applications(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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