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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AI-Extracted 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, prevent...

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Method used

In the development process of this technology, fully considered its practicability and ease of operation, still adopt stopper type operating mechanism, movable electric heating system, also make full use of original equipment, accomplish low input, and Good removal effect can be obtained, the quality of molten steel can be greatly improved, and there is great market potential.

The change of ladle temperature is small, and the refining time of blowing argon is long, reduces gas entrainment, inclusion, solves the problems such as stopper bar deformation, can't open ladle. The output power of electric heating and argon blowing position, argon blowing volume, and argon blowing time meet the requirements, effectively degassing and removing inclusions from molten metal, and significantly improve the quality of molten steel.

The embodiment results show that the present invention mainly adopts electroslag heating, long-time argon-blowing refining technology, technology for preventing stopper rod sticking, technology for preventing stopper rod deformation to meet the needs of small-sized tundish for refining outside the furnace. The original tundish is improved, and the operation process is simple. Compared with the induction current and plasma heating methods, the present invention adopts the electroslag heating method, which not only has small investment and is convenient to use, but also reduces the e...

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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.

Technology Topic

ElectricityLadle furnace +9

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Examples

Experimental program(3)

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 molten metal temperature of the ladle is 1560°C.

[0041] 2. The characteristics of long-term argon blowing refining technology are: the position of argon blowing is 0.5R away from the center of the ladle (R is the radius of the ladle), the argon pressure is 0.3MPa, and the inner diameter of the pressure pipe 5mm, 30 minutes of argon blowing time.

[0042]3. To prevent the plug rod from sticking to the bag, the bottom leakage plug hole brick at the bottom of the ladle and the bottom of the plug rod is 100mm higher than the bottom surface to prevent the plug rod from deforming; the hollow of the plug rod is 10mm, argon gas is passed through the central channel of the stopper rod, the pressure is 0.35MPa, and the time is 30 minutes. To avoid air entrainment and inclusion, the top of the brick with a plug hole adopts the outer winding method, the outer winding radius is R60mm, and the refractory mud is 20mm thick on the outer layer of the ladle refractory brick. In this embodiment, the refractory mud has a particle size of 40-80 mesh, and is used in combination with water glass. The water glass accounts for 6% of the weight of the refractory mud; the refractory mud is commonly used refractory mud, calculated by weight percentage, Al 2 O 3 : 20%; SiO 2 : 65%; C: 10%, the rest is Na 2 O, K 2 O.

[0043] The invention solves the problems of insufficient refining time, entrainment, inclusions, plug rod deformation, and inability to open ladle by argon blowing. Electric heating output power, argon blowing position, argon blowing volume, and argon blowing time can effectively degas and remove inclusions from molten metal, which significantly improves the quality of molten steel.

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, and the ladle molten metal temperature is 1550°C.

[0048] 2. The characteristics of long-term argon blowing refining technology are: the position of argon blowing is 0.6R from the center of the ladle (R is the radius of the ladle), the argon pressure is 0.4MPa, and the inner diameter of the pressure pipe 8mm, argon blowing time 35 minutes.

[0049] 3. To prevent the plug rod from sticking to the bag, the bottom leakage plug hole brick at the bottom of the ladle and the bottom of the plug rod is 150mm higher than the bottom surface to prevent the plug rod from being deformed; the hollow of the plug rod is 20mm, argon gas is passed through the central passage of the stopper rod, the pressure is 0.45MPa, and the time is 35 minutes. To avoid air entrainment and inclusion, the top of the brick with a plug hole adopts the outer winding method, the outer winding radius is R70mm, and the refractory mud is 30mm thick on the outer layer of the ladle refractory brick. In this embodiment, the refractory mud has a particle size of 40-80 mesh, and is used in combination with water glass. The water glass accounts for 3% of the weight of the refractory mud; the refractory mud is commonly used refractory mud, calculated by weight percentage, Al 2 O 3 : 20%; SiO 2 : 65%; C: 10%, the rest is Na 2 O, K 2 O.

[0050] The temperature change of the ladle is small, the argon blowing refining time is long, the entrainment and inclusions are reduced, and the problems such as deformation of the plug rod and failure to open the ladle are solved. The electric heating output power, argon blowing position, argon blowing volume, and argon blowing time meet the requirements, effectively degassing and removing inclusions from the molten metal, and significantly improves the quality of molten steel.

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 is 40 minutes, the power is 140KW, and the molten metal temperature of the ladle is 1570°C.

[0055] 2. The characteristics of long-term argon blowing refining technology are: the position of argon blowing is 0.7R from the center of the ladle (R is the radius of the ladle), the argon pressure is 0.5MPa, and the inner diameter of the pressure pipe 15mm, argon blowing time 40 minutes.

[0056] 3. To prevent the plug rod from sticking to the bag, the bottom leakage plug hole brick at the bottom of the ladle and the bottom of the plug rod is 200mm higher than the bottom surface to prevent the plug rod from being deformed; the hollow of the plug rod is 12mm, argon gas is passed through the central channel of the stopper rod, the pressure is 0.55MPa, and the time is 40 minutes. To avoid air entrainment and inclusion, the top of the brick with a plug hole adopts the outer winding method, the outer winding radius is R80mm, and the refractory mud is 40mm thick on the outer layer of the ladle refractory brick. In this embodiment, the refractory mud has a particle size of 40-80 mesh, and is used in combination with water glass. The water glass accounts for 10% of the weight of the refractory mud; the refractory mud is commonly used refractory mud, calculated by weight percentage, Al 2 O 3 : 20%; SiO 2 : 65%; C: 10%, the rest is Na 2 O, K 2 O.

[0057] The argon blowing refining time is long, and the temperature is controlled uniformly. The gas and inclusions float up to the protective slag to solve the problems of plug rod deformation and failure to open the ladle. Electric heating output power, argon blowing position, argon blowing volume, and argon blowing time meet the requirements, effectively degassing and removing inclusions from molten metal, and significantly improves the quality of molten steel.

[0058] Working process and results of the present invention:

[0059] When using the present invention to refining 10-30 tons of bottom leaking ladle outside the furnace, it mainly adopts early electroslag protection technology, electroslag heating technology, long-term argon blowing refining technology, technology to prevent plug rod sticking, and technology to prevent plug rod deformation. Avoid air entrainment, inclusion technology and furnace lining protection technology, etc. Successfully solved the problem of insufficient refining time by blowing argon to prevent entrainment, inclusion and deformation of the plug rod, and failure to open the ladle. The electric heating output power, argon blowing position, argon blowing volume, and argon blowing time are reasonably designed to effectively degas, desulfurize, and remove inclusions from the molten metal, which significantly improves the quality of molten steel.

[0060] The results of the examples show that the present invention mainly adopts electroslag heating, long-term argon blowing refining technology, plug rod sticking prevention technology, and plug rod deformation prevention technology to meet the needs of small tundish for refining outside the furnace, and only the original intermediate The package is improved and the operation process is simple. Compared with the induction current and plasma heating methods, the present invention adopts the electroslag heating method, which not only has low investment and is convenient to use, but also reduces the corrosion of high temperature to the furnace lining, enables the heat to be quickly transferred to the molten steel, and ensures the stability of the molten steel temperature. The electroslag heating ensures the argon blowing time. The alkaline slag system used not only helps to remove sulfur, but also avoids gas suction. After argon blowing and stirring, the effect of removing gas and inclusions is obvious. In order to prevent secondary oxidation during the casting process, an argon protection device is used outside the drain.

[0061] In the development process of this technology, the practicability and ease of operation were fully considered, and the stopper-type operating mechanism, the movable electric heating system were still used, and the original equipment was also fully utilized to achieve low investment and good performance. The removal effect can greatly improve the quality of molten steel and has great market potential.

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PUM

Property	Measurement	Unit
Granularity	40.0 ~ 80.0	mesh
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce inclusions
Improve the quality of molten steel

Secondary refining method of 10 to 30 tons bottom breakout ladle

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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