New method for modifying top dross in steel ladle of rimmed steel

A new method and technology for boiling steel, applied in the direction of manufacturing converters, etc., can solve the problems of secondary pollution of molten steel, difficult top slag modification, poor modification effect, etc., and achieve the effect of ensuring modification effect.

Active Publication Date: 2012-07-18
ANGANG STEEL CO LTD
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Problems solved by technology

It is difficult to modify the top slag in the ladle in this route. The current modification method is to add a modifier to the top slag of the molten steel tank, and to provide kinetic conditions by blowing argon at the bottom of the molten steel, but there are many ways to do this. Disadvantages, such as modification after vacuum refining, will cause the oxidation of molten steel after refining; if modification before vacuum refining, due to the high oxygen content of molten steel, the top slag modifier reacts with oxygen in molten steel, and the modification effect is poor
If it is not modified, the highly oxidizable top slag will cause secondary pollution to molten steel during the casting process

Method used

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  • New method for modifying top dross in steel ladle of rimmed steel
  • New method for modifying top dross in steel ladle of rimmed steel
  • New method for modifying top dross in steel ladle of rimmed steel

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Embodiment Construction

[0011] The method of upgrading the top slag is mainly to add a deoxidizer to the top slag, and the deoxidizer reacts with (FeO) in the top slag to remove the oxygen in the top slag to achieve the purpose of upgrading.

[0012] In order to prevent the oxygen in the molten steel from entering the top slag during the top slag modification process before vacuum refining and destroy the modification effect, the present invention does not use bottom-blown argon to stir the molten steel to provide dynamic conditions for the top slag modification, but uses mechanical stirring The method is to stir the top slag, so as to prevent the oxygen in molten steel from entering the top slag to participate in the reaction.

[0013] The present invention applies steel type:

[0014] 1. Low-carbon aluminum-killed steel with a carbon content of 150-500ppm;

[0015] 2. Ultra-low carbon aluminum killed steel with carbon content less than 60ppm;

[0016] The specific technical scheme is described as...

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Abstract

The invention relates to a liquid steel secondary refining method for steelmaking, in particular to a new method for modifying the top dross in a steel ladle of rimmed steel. The method is achieved by stirring the top dross by adopting a mechanical stirring way to promote the contact and reaction of a modifier and the top dross and react, wherein the modifier comprises the main components as follows in parts by weight: 30-70 parts of CaO and 70-30 parts of Al. The method is suitable for aluminum killed low carbon steel with the carbon content of 150-500ppm or aluminum killed ultralow carbon steel with the carbon content less than 60ppm. Compared with the prior art, the invention effectively ensures the modifying effect of the top dross of the rimmed steel and lowers the FeO content in steel slag to below 4 percent and can be used for producing steel for cold-rolled sheets with high cleanliness.

Description

technical field [0001] The invention relates to secondary refining of molten steel in steelmaking, and is a new method for improving quality of top slag in a boiling steel ladle. Background technique [0002] The production route of ultra-low carbon steel is to produce boiling steel by converter, and reduce the carbon content of molten steel through vacuum refining. It is difficult to modify the top slag in the ladle in this route. The current modification method is to add a modifier to the top slag of the molten steel tank, and to provide kinetic conditions by blowing argon at the bottom of the molten steel, but there are many ways to do this. Disadvantages, such as modification after vacuum refining, will cause the oxidation of molten steel after refining; if modification before vacuum refining, due to the high oxygen content of molten steel, the top slag modifier reacts with oxygen in molten steel, and the modification effect is poor. If it is not modified, the highly ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 吴世龙刘伟孟宪娟毛志勇
Owner ANGANG STEEL CO LTD
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