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A kind of dephosphorization method in if steel ladle

A technology for ladle and ladle refining furnace is applied in the field of dephosphorization in ladle when ultra-low carbon steel for automobile is refined in a ladle refining furnace, which can solve problems such as affecting the qualified rate of steel quality, exceeding the standard of phosphorus content in steel, reducing phosphorus content, etc. Achieve the effect of reducing the probability of steel modification, ensuring that the phosphorus content reaches the standard, and improving the control level

Inactive Publication Date: 2011-12-28
ANGANG STEEL CO LTD
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Problems solved by technology

However, high temperature tapping is not conducive to the reduction of phosphorus content in molten steel. In addition, there are no other dephosphorization measures, so the phosphorus content of IF steel often exceeds the standard, and steel modification has to be carried out, which not only seriously affects the quality of steel. and cause undue economic loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Adopt 250t converter, 250t ladle refining furnace, 250t ladle.

[0020] 1. After the molten steel reaches the ladle refining furnace, that is, the LF refining position, add lime into the ladle in two batches; the first batch adds 1000kg of lime at a rate of 4kg per ton of steel; the second batch adds 750kg of lime at a rate of 3kg per ton of steel white ash.

[0021] 2. The LF heats up according to the needs of the outbound temperature. When the temperature rises to 1645°C, the ladle blows argon at an argon flow rate of 80Nm3 / h.

Embodiment 2

[0023] Adopt 250t converter, 250t ladle refining furnace, 250t ladle.

[0024] 1. After the molten steel reaches the ladle refining furnace, that is, the LF refining position, add lime into the ladle in 3 batches; the first batch adds 750kg of lime at a rate of 3kg per ton of steel; the second batch adds 750kg of lime at a rate of 3kg per ton of steel Lime ash; in the third batch, 500kg of lime is added at a ratio of 2kg per ton of steel.

[0025] 2. LF heats up according to the needs of the outbound temperature. When the temperature rises to 1650°C, press 100Nm 3 / h argon gas flow for ladle blowing argon operation.

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Abstract

The invention provides a dephosphorization method in the IF ladle. After the molten steel reaches the ladle refining furnace, that is, the LF refining position, a certain amount of lime is added to the ladle in 2 to 3 batches; After that, carry out argon blowing operation with large argon gas flow rate in the ladle. The present invention utilizes the principles of thermodynamics and kinetics respectively to realize the dephosphorization treatment of IF steel in molten steel tank during LF refining process, and the implementation effect is remarkable, which can improve the control level of phosphorus in IF steel and reduce the phosphorus content in molten steel by 50%. The above ensures that the phosphorus content reaches the standard, reduces the probability of steel modification caused by excessive phosphorus content in molten steel, improves the quality pass rate of steel, and avoids economic losses caused by steel modification.

Description

technical field [0001] The invention belongs to the field of steelmaking technology, and particularly relates to a method for dephosphorizing in a ladle when ultra-low carbon steel for automobiles (abbreviated as IF steel) is refined in a ladle refining furnace (abbreviated as LF). Background technique [0002] Due to the requirements of the refining production process regulations of the vacuum circulation degassing furnace (RH for short), the ultra-low carbon steel for automobiles, that is, IF steel, should be heated up as little or not as possible during the RH refining process, so the tapping temperature of the steelmaking process is required to be relatively high. . However, high temperature tapping is not conducive to the reduction of phosphorus content in molten steel. In addition, there are no other dephosphorization measures, so the phosphorus content of IF steel often exceeds the standard, and steel modification has to be carried out, which not only seriously affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/10
Inventor 毛志勇吴世龙王鹏郭猛孙艳霞孟宪娟
Owner ANGANG STEEL CO LTD
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