Secondary refining method of 10 to 30 tons bottom breakout ladle

A technology of ladle and ladle furnace, which is applied in the field of 10-30 ton bottom leakage ladle refining outside the furnace, can solve the problems of inability to open the ladle, deformation of the plug rod, insufficient refining time, etc. The effect of liquid quality

Active Publication Date: 2010-03-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, preventing plug rod Deformation technology, avoiding gas entrainment, inclusion technology and furnace lining protection technology have successfully solved the problems of insufficient argon blowing refining time, prevention of entrainment gas inclusion, deformation of stopper rod, and inability to open the ladle, etc.

Method used

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

Examples

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Effect test

Embodiment 1

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

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

[0040] 1. Early electroslag protection, place electroslag with a thickness of 200mm at the bottom of the ladle before the molten steel is released from the furnace. The main components of electroslag are: CaF2 70wt%, Al 2 o 3 30 wt%. The graphite electrode is placed in the protective electroslag on the upper part of the molten metal, at 2 / 3 of the thickness of the electroslag, the electroslag heating time is 30 minutes,...

Embodiment 2

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

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

[0047] 1. Early electroslag protection, place electroslag with a thickness of 300mm on the bottom of the ladle before the molten steel is released from the furnace. The main component of electroslag is: CaF 2 75wt%, Al 2 o 3 25 wt%. The graphite electrode is placed in the protective electroslag on the upper part of the molten metal, at 2 / 3 of the thickness of the electroslag, the electroslag heating time is 35...

Embodiment 3

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

[0053] The implementation of the present invention is as follows: mainly adopt early electroslag protection technology, electroslag heating technology, long-time argon blowing refining technology, technology of preventing plug sticking, technology of preventing plug rod deformation, technology of avoiding gas entrainment, inclusion technology and furnace lining protection technology Wait. The specific process is as follows:

[0054] 1. Early electroslag protection, place electroslag with a thickness of 400mm at the bottom of the ladle before the molten steel is released from the furnace. The main component of electroslag is: CaF 2 80wt%, Al 2 o 3 20 wt%. The graphite electrode is placed in the protective electroslag on the upper part of the molten metal, which is 3 / 4 of the thickness of the electroslag. The electroslag heating time is 40 m...

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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 technologysuccessfully 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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Patent Type & Authority Patents(China)
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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