Secondary refining method of 10 to 30 tons bottom breakout ladle

A technology of ladle furnace and steel breakout, which is applied in the field of 10-30 tons of bottom leakage ladle refining outside the furnace, which can solve the problems of insufficient refining time, inability to open the ladle, and deformation of the stopper rod, so as to reduce inclusions and improve the quality of molten steel , the effect of simple installation

Active Publication Date: 2008-11-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a 10-30 ton bottom leaking ladle refining method outside the furnace, which mainly adopts early electroslag protection technology, electroslag heating technology, long-time argon blowing refining technology, technology for preventing plug sticking, prevent

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  • Secondary refining method of 10 to 30 tons bottom breakout ladle
  • Secondary refining method of 10 to 30 tons bottom breakout ladle
  • Secondary refining method of 10 to 30 tons bottom breakout ladle

Examples

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Example Embodiment

[0037] Example 1

[0038] The material of this embodiment is No. 45 steel, the weight of the molten metal is 10 tons, and the refining time is 30 minutes.

[0039] The implementation of the present invention is as follows: mainly adopts early electroslag protection technology, electroslag heating technology, long-term argon blowing refining technology, plug rod sticking prevention technology, plug rod deformation prevention technology, gas entrainment, inclusion technology and furnace lining protection technology Wait. The specific process is as follows:

[0040] 1. Early electroslag protection. Before the molten steel is released from the furnace, a 200mm thick electroslag is placed on the bottom of the ladle. The main component of the electroslag is: CaF 2 70wt%, Al 2 O 3 30wt%. The graphite electrode is placed in the protective electroslag above the molten metal, at 2 / 3 of the thickness of the electroslag, the electroslag heating time is 30 minutes, the power is 100KW, and the ...

Example Embodiment

[0044] Example 2

[0045] The material of this embodiment is high manganese steel, the weight of the molten metal is 15 tons, and the refining time is 35 minutes.

[0046] The implementation of the present invention is as follows: mainly adopts early electroslag protection technology, electroslag heating technology, long-term argon blowing refining technology, plug rod sticking prevention technology, plug rod deformation prevention technology, gas entrainment, inclusion technology and furnace lining protection technology Wait. The specific process is as follows:

[0047] 1. In the early days of electroslag protection, a 300mm thick electroslag was placed on the bottom of the ladle before the molten steel was released. The main component of the electroslag was: CaF 2 75wt%, Al 2 O 3 25wt%. The graphite electrode is placed in the protective electroslag above the molten metal, at 2 / 3 of the thickness of the electroslag, the electroslag heating time is 35 minutes, the power is 120KW, ...

Example Embodiment

[0051] Example 3

[0052] The material of this embodiment is 35CrMo steel, the weight of the molten metal is 25 tons, and the refining time is 40 minutes.

[0053] The implementation of the present invention is as follows: It mainly adopts early electroslag protection technology, electroslag heating technology, long-term argon blowing refining technology, technology to prevent plug rod sticking, technology to prevent plug rod deformation, technology to avoid entrainment, inclusion and furnace lining protection technology Wait. The specific process is as follows:

[0054] 1. In the early days of electroslag protection, electroslag with a thickness of 400mm was placed on the bottom of the ladle before the molten steel was released. The main component of the electroslag was: CaF 2 80wt%, Al 2 O 3 20wt%. The graphite electrode is placed in the protective electroslag above the molten metal, which is located at 3 / 4 of the thickness of the electroslag. The heating time of the electroslag...

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Abstract

The invention relates to an external furnace refining technology for a bottom leakage steel ladle of 10 to 30 tons, in particular to the external furnace refining technology for the bottom leakage steel ladle of 10 to 30 tons. A method of the invention mainly adopts an early electroslag protection technology, an electroslag heating technology, a long-term argon blowing refining technology, a plugstick adhesion prevention technology, a plugstick deformation prevention technology, an air coiling and mingling prevention technology, a furnace brick lining protection technology, etc. The technology successfully solves the problems that the argon blowing refining time is not enough, air coiling and mingling and plugstick deformation are prevented, the steel ladle can not be opened, etc. The technology reasonably designs the electrical heating output power, an argon blowing position, the argon blowing amount and the argon blowing time, effectively carries out degassing, desulphurization, impurity removal, etc. to molten metal and remarkably improves the quality of molten steel. Through carrying out electroslag hating to the steel ladle of 10 to 30 tons, the technology carries out argon pumping and refining for a long time, and uses graphite as electrodes; and the output power can meet the power needed when a temperature reduction speed is the rapidest and ensure that the temperature of the molten steel is stable and is not reduced.

Description

technical field [0001] The invention relates to an out-of-furnace refining technology for a 10-30 ton bottom leak ladle, in particular to an out-of-furnace refining method for a 10 to 30 ton bottom leak ladle. Background technique [0002] With the continuous development of the industry, the traditional steelmaking process and equipment are difficult to meet the high-quality requirements, so the external refining technology must be adopted. In recent years, with the advancement of pure steel production technology and the requirement to reduce production costs, the refining process and equipment outside the furnace have become popular rapidly. At present, the out-of-furnace refining methods popularized on an industrial scale can be divided into the following categories according to their characteristics: vacuum degassing method, ladle refining method, and AOD method, and the bottom blowing argon technology is widely used in these methods. The argon blowing steelmaking techno...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/072
Inventor 傅排先刘宏伟康秀红夏立军李殿中李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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