CN109880974A - A kind of RH method of refining reducing ultra-low-carbon steel tundish total oxygen content - Google Patents
A kind of RH method of refining reducing ultra-low-carbon steel tundish total oxygen content Download PDFInfo
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- CN109880974A CN109880974A CN201910211383.XA CN201910211383A CN109880974A CN 109880974 A CN109880974 A CN 109880974A CN 201910211383 A CN201910211383 A CN 201910211383A CN 109880974 A CN109880974 A CN 109880974A
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Abstract
The present invention relates to a kind of RH method of refining for reducing ultra-low-carbon steel tundish total oxygen content, belong to continuous casting technology field, comprising: into the converter molten steel by decarburization and/or degassing process, aluminium is added and carries out deoxidation treatment, at least 3min is kept, siliceous metal is then added, obtains refined molten steel；Based on mass percentage, based on parts per million concentration, silicone content is 90-110ppm in the refined molten steel, increase [Si] content in molten steel, reaching RH terminates to trough casting process after molten steel is in contact with air, the combination for reducing Al and oxygen generates Al2O3, to reach the method for packet oxygen content in reduction.Reach purified steel oxygen content in water≤10ppm, have the function of purifying molten steel and avoids nozzle blocking.
Description
Technical field
The present invention relates to a kind of RH method of refining for reducing ultra-low-carbon steel tundish total oxygen content, belong to refining techniques neck
Domain.
Background technique
When using converter-RH refining-continuous casting manufacturing technique casting ultra-low-carbon steel (C < 0.0030%), RH refining process
In, deoxidation is generally carried out to molten steel using aluminium, aluminium and steel water oxygen generate Al2O3Type impurity, in later period calmness and casting process
Although little particle Al2O3Type impurity is easy collision polymerization and grows up and removal of floating, but still some Al2O3Type impurity is deposited
In molten steel, on the one hand, influence Molten Steel Cleanliness, and then influence Ultra-low carbon billet quality, on the other hand, in crystallizer immersion
At water-gap outlets be easy aggregation and nozzle clogging phenomenon occurs, nozzle clogging block the phenomenon that aggravation influence whether tundish even pour
Ultra-low-carbon steel casting castability in furnace number and steel-making process, and then influence Ultra-low carbon steel billet production efficiency and quality.
Al in molten steel2O3Field trash total amount has with tundish total oxygen content directly to be contacted, by controlling tundish total oxygen content
To nozzle blocking is reduced, improves slab quality and play an important role.
Summary of the invention
In view of the above technical problems, the purpose of the present invention is to provide a kind of reduction ultra-low-carbon steel tundish total oxygen contents
RH method of refining, deoxidation is all completed by aluminium block after RH refining decarburization, and steel oxygen content in water is removed within 10ppm,
Low-carbon ferrosilicon purpose is added to increase [Si] content in molten steel, reaching RH terminates to trough casting process when molten steel and air
After being in contact, the combination for reducing Al and oxygen generates Al2O3, to reach the method for packet oxygen content in reduction.The present invention mentions
For a kind of method for reducing ultra-low-carbon steel tundish total oxygen content, comprising: to the converter molten steel by decarburization and/or degassing process
In, aluminium block is added and carries out deoxidation treatment, keeps at least 3min, siliceous metal is then added, obtains refined molten steel；By quality percentage
Content meter, based on parts per million concentration, silicone content is 90-110ppm in the refined molten steel.
Further, the tapping temperature of the converter molten steel is 1650-1665 DEG C, and RH inlet temperature is 1570-1630 DEG C,
Wherein, it if the RH inlet temperature is higher than 1605 DEG C, carries out adjusting coolant scrap operation；Preferably, the RH inlet temperature
It is 1585-1600 DEG C.
Further, it is described turn down carbon duriron and ferro-titanium after, carry out the pure circulation, the pure circulation time >=
6min。
Further, while carrying out the pure circulation, heating by O2 blowing operation is carried out, in heating by O2 blowing operation, often
Oxygen blast 100Nm3, then the circulation time increases 1min.
Further, the aluminium includes aluminium block and/or aluminum strip and/or aluminium powder, and the aluminum amount is the converter steel water quality
The 0.038-0.042% of amount.
Further, the aluminium is aluminium block.
Further, after the aluminum deoxidation carries out at least 3min, the siliceous metal is added.
Further, the mass percentage of silicon is 75-77% in the siliceous metal.
Further, the siliceous metal is low-carbon ferrosilicon.
Compared with the prior art, the invention has the following advantages that
1, the method for the present invention is by the way that in ultra-low-carbon steel RH refining process, deoxidation is all by aluminium block after RH refines decarburization
It completes, steel oxygen content in water is removed within 10ppm, add low-carbon ferrosilicon purpose to increase [Si] content in molten steel, reach
Terminating to trough casting process after molten steel is in contact with air to RH, the combination for reducing Al and oxygen generates Al2O3, from
And reach the method for packet oxygen content in reduction.Reach purified steel oxygen content in water≤10ppm, there is purification molten steel and avoids the mouth of a river
The effect of blocking.
2, the method for the present invention is easy to operate, is readily put into large-scale production.
Specific embodiment
Below in conjunction with specific embodiment and embodiment, it is specifically described the present invention, advantages of the present invention and various effects
It thus will clearly present.It will be understood by those skilled in the art that these specific embodiments and embodiment are for illustrating
The present invention is not intended to limit the present invention.
Throughout the specification, unless otherwise specified, terms used herein are interpreted as usual in this field
Used meaning.Therefore, unless otherwise defined, all technical and scientific terms used herein has leads with belonging to the present invention
The identical meaning of the general understanding of field technique personnel.Contradiction if it exists, this specification are preferential.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention, can pass through
Market is commercially available or can be prepared by existing method.
Embodiment 1
The present invention provides a kind of method for reducing ultra-low-carbon steel tundish total oxygen content, comprising: to process decarburization and/or takes off
In the converter molten steel of gas disposal, aluminium block is added and carries out deoxidation treatment, keeps 3min, low-carbon ferrosilicon is then added, obtains purified steel
Water；Based on parts per million concentration, silicone content is 100ppm in the refined molten steel.
The tapping temperature of the converter molten steel is 1658 DEG C, and RH inlet temperature is 1585 DEG C
The aluminum amount is the 0.040% of the converter molten steel quality, obtains tundish oxygen content in 17ppm
Embodiment 2
The present invention provides a kind of method of total oxygen content in reduction ultra-low-carbon steel RH refining, comprising: to by decarburization and/or
In the converter molten steel of degassing process, aluminium block is added and aluminum strip carries out deoxidation treatment, keeps 3min, low-carbon ferrosilicon is then added, obtains
To refined molten steel；Based on parts per million concentration, silicone content is 90ppm in the refined molten steel.
The tapping temperature of the converter molten steel is 1650 DEG C, and RH inlet temperature is 1590 DEG C.
The aluminum amount is the 0.041% of the converter molten steel quality, tundish oxygen content is obtained in 18ppm.
Embodiment 3
The present invention provides a kind of method for reducing ultra-low-carbon steel tundish total oxygen content, comprising: to process decarburization and/or takes off
In the converter molten steel of gas disposal, aluminium block is added and carries out deoxidation treatment, keeps 3min, low-carbon ferrosilicon is then added, obtains purified steel
Water；Based on parts per million concentration, silicone content is 110ppm in the refined molten steel.
The tapping temperature of the converter molten steel is 1665 DEG C, and RH inlet temperature is 1600 DEG C.
The aluminum amount is the 0.042% of the converter molten steel quality, obtains tundish oxygen content in 18ppm.
Embodiment 4
The present invention provides a kind of method for reducing ultra-low-carbon steel tundish total oxygen content, comprising: the converter molten steel goes out
Steel temperature is 1650 DEG C, and RH inlet temperature is 1615 DEG C, first carries out adjusting coolant scrap operation, at by decarburization and/or degassing
In the converter molten steel of reason, aluminium block is added and carries out deoxidation treatment, keeps 3min, low-carbon ferrosilicon is then added, carries out pure circulation behaviour
Make, obtains refined molten steel；Based on parts per million concentration, silicone content is 90ppm in the refined molten steel.
The pure circulation time is 6min.
The aluminum amount is the 0.038% of the converter molten steel quality, obtains tundish oxygen content in 17ppm.
Embodiment 5
The present invention provides a kind of method for reducing ultra-low-carbon steel tundish total oxygen content, comprising: carries out adjusting coolant scrap behaviour
Make, into the converter molten steel by decarburization and/or degassing process, aluminium block is added and carries out deoxidation treatment, keeps 3min, is then added
Low-carbon ferrosilicon, pure circulate operation obtain refined molten steel；Based on parts per million concentration, silicone content is 90 in the refined molten steel.
The tapping temperature of the converter molten steel is 1650 DEG C, and RH inlet temperature is 1615 DEG C.
The pure circulation time is 8min.
Wherein, while carrying out the pure circulation, heating by O2 blowing operation is carried out, in heating by O2 blowing operation, every oxygen blast
200Nm3。
The aluminum amount is the 0.038% of the converter molten steel quality, obtains tundish oxygen content in 18ppm.
Finally, it is to be noted that, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of method for reducing total oxygen content in ultra-low-carbon steel RH refining characterized by comprising to by decarburization and/or
In the converter molten steel of degassing process, aluminium is added and carries out deoxidation treatment, keeps at least 3min, siliceous metal is then added, obtains essence
Make steel water；Based on mass percentage, based on parts per million concentration, silicone content is 90-110ppm in the refined molten steel.
2. the method according to claim 1, wherein the tapping temperature of the converter molten steel be 1650-1665 DEG C,
RH inlet temperature be 1570-1650 DEG C, wherein if the RH inlet temperature be higher than 1605 DEG C, carry out adjust coolant scrap and
Pure circulate operation.
3. according to the method described in claim 2, it is characterized in that, the RH inlet temperature is 1585-1600 DEG C.
4. according to the method described in claim 2, carry out the pure circulation it is characterized in that, after the tune coolant scrap,
Pure circulation time >=the 6min.
5. the method according to claim 3 or 4, which is characterized in that while carrying out the pure circulation, carry out heating by O2 blowing
It operates, in the heating by O2 blowing operation, every oxygen blast 100Nm3, then the circulation time increases 1min.
6. the method according to claim 1, wherein the aluminium includes aluminium block and/or aluminum strip and/or aluminium powder, institute
State the 0.038-0.042% that aluminum amount is the converter molten steel quality.
7. according to the method described in claim 6, it is characterized in that, the aluminium is aluminium block.
8. the method according to claim 1, wherein the mass percentage of silicon is 75- in the siliceous metal
77%.
9. method according to claim 1 or 8, which is characterized in that the siliceous metal is low-carbon ferrosilicon.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110982979A (en) * | 2019-12-30 | 2020-04-10 | 首钢集团有限公司 | Production method of ultra-low carbon steel for iron-based alloy |
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Application publication date: 20190614 |