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Tundish protection casting method for ultra-low carbon steel

A technology of ultra-low carbon steel and casting method, which is applied in the field of tundish protection and casting of ultra-low carbon steel, can solve the problems of increasing cost and difficulty, and achieves reduction of smelting difficulty, smelting cost and cycle, and reduction of carbon removal pressure. Effect

Active Publication Date: 2020-04-10
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the ultra-low carbon steel liquid contacts them, the carbon element will undergo mass transfer from the refractory material, the covering agent to the steel liquid. It varies from a few ppm. In order to ensure that the composition of the molten steel meets the standard, the carbon increase in the casting process needs to be taken into account. Therefore, the requirements for the carbon content in the molten steel before casting are more stringent, and the cost and difficulty of the early smelting increase.

Method used

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  • Tundish protection casting method for ultra-low carbon steel

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Effect test

Embodiment 1

[0027] A tundish protective casting method for ultra-low carbon steel, comprising the following steps:

[0028] S1, ultra-low carbon steel casting, when casting, the tundish cover blowing device blows out the mixed gas of carbon dioxide and argon; the mass fraction of C element of ultra-low carbon steel is 0.01%; cover the cover in full argon On the basis of the shielding gas flow, it is also necessary to consider that each unit volume of carbon dioxide gas will produce two units of CO gas, resulting in an increase in gas flow. The CO gas is detected once every 5 minutes by the CO detector, and recorded for comparison to judge the rising trend of the CO gas concentration.

[0029] At the casting temperature T, the formula is:

[0030] C+CO 2 (g)→2CO 2 (g)ΔG=144700-1295T

[0031] In the formula, C is the carbon content in ultra-low carbon steel, CO 2 is the mass of carbon dioxide, ΔG is a constant -2.18×10 6 ;

[0032] When the casting temperature is 1600℃, the reaction ...

Embodiment 2

[0037] A tundish protective casting method for ultra-low carbon steel, comprising the following steps:

[0038] S1. Casting of ultra-low carbon steel. When casting, the tundish cover blowing device blows out the mixed gas of carbon dioxide and argon; the mass fraction of C element in the steel grade of ultra-low carbon steel is 0.001%; ​​the cover is covered in full argon On the basis of the shielding gas flow, it is also necessary to consider that each unit volume of carbon dioxide gas will produce two units of CO gas, resulting in an increase in gas flow. The CO gas is detected once every 10 minutes by the CO detector, and recorded for comparison to judge the rising trend of the CO gas concentration.

[0039] At the casting temperature T, the formula is:

[0040] C+CO 2 (g)→2CO 2 (g)ΔG=144700-1295T

[0041] In the formula, C is the carbon content in ultra-low carbon steel, CO 2 is the mass of carbon dioxide, ΔG is a constant -2.18×10 6 ;

[0042] When the casting temp...

Embodiment 3

[0047] A tundish protective casting method for ultra-low carbon steel, comprising the following steps:

[0048] S1. Casting of ultra-low carbon steel. During casting, the tundish cover blowing device blows out a mixture of carbon dioxide and argon; On the basis of the shielding gas flow, it is also necessary to consider that each unit volume of carbon dioxide gas will produce two units of CO gas, resulting in an increase in gas flow. The CO gas is detected once every 6 minutes by the CO detector, and recorded for comparison to judge the rising trend of the CO gas concentration.

[0049] At the casting temperature T, the formula is:

[0050] C+CO 2 (g)→2CO 2 (g)ΔG=144700-1295T

[0051] In the formula, C is the carbon content in ultra-low carbon steel, CO 2 is the mass of carbon dioxide, ΔG is a constant -2.18×10 6 ;

[0052] When the casting temperature is 1630℃, the reaction ΔG=-2.18×10 6 , and with the elimination of product CO, the reaction can continue to proceed to...

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Abstract

The invention discloses a tundish protection casting method for ultra-low carbon steel. The tundish protection casting method comprises the following steps that S1, ultra-low carbon steel is cast, andduring casting, a tundish cover blowing device blows out mixed gas of carbon dioxide and argon; S2, when casting is started for 0-5min, the flow of the carbon dioxide gas in the mixed gas of the carbon dioxide and the argon blown out by the tundish cover blowing device is 1500-2500Nl / min; and S3, after the casting time is 5min, casting is finished, the volume fraction of the carbon dioxide gas is5%-15%, and the gas flow is 200-1500Nl / min. According to the method, the 5%-30% carbon dioxide gas is mixed in the tundish cover protection gas argon, the carbon dioxide gas enters molten steel to react, and carbon monoxide bubbles float up in the molten steel to be discharged. The carbon dioxide gas can consume carbon in the steel under the casting temperature condition, the concentration of thegenerated carbon monoxide gas is extremely low, and the carbon monoxide gas is fully burnt out when escaping out of a tundish, and the safety problem cannot be caused.

Description

technical field [0001] The invention relates to the technical field of ultra-low carbon steel tundish protective casting, in particular to a method for ultra-low carbon steel tundish protective casting. Background technique [0002] A large amount of air enters the tundish between the end of the tundish baking and before pouring. In this case, the molten steel will be oxidized when the molten steel is cast. Therefore, an argon blowing device for the cover of the tundish was added. After the tundish is baked, open the argon blowing pipeline, and increase the argon pressure, and blow the argon gas at a high speed to completely purge the tundish, and discharge all the air in the tundish, so as to form a Argon protective layer, until the tonnage of the tundish rises to a certain height, then cover it with a covering agent, and then reduce the gas flow rate to ensure that the high-temperature molten steel is in a slightly positive pressure state of argon during the casting proce...

Claims

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Application Information

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IPC IPC(8): B22D1/00
CPCB22D1/002
Inventor 吕迺冰刘国梁李海波朱国森朱志远潘宏伟季晨曦刘珂邓小旋董文亮高攀尹娜
Owner SHOUGANG CORPORATION
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