CN108330251A - Process for decarbonizing after a kind of Converter - Google Patents
Process for decarbonizing after a kind of Converter Download PDFInfo
- Publication number
- CN108330251A CN108330251A CN201810494196.2A CN201810494196A CN108330251A CN 108330251 A CN108330251 A CN 108330251A CN 201810494196 A CN201810494196 A CN 201810494196A CN 108330251 A CN108330251 A CN 108330251A
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- steel
- converter
- molten steel
- ladle
- decarburization
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Process for decarbonizing after a kind of Converter, it is controlled by the steel grade normal operating technique in converter steelmaking process, in converter terminal to the oxygen and carbon progress suitable control in steel, suitable suitable slag charge is added in converter tapping process, it is not added with deoxygenated alloy, also without alloying, to ensure that molten steel suitable oxygen content in ladle, tapping do not allow slag.Tapping finishes, ladle is stirred using big argon gas to molten steel decarburization, when the carbon content in steel reaches≤0.03%, suitable deoxygenated alloy is added into ladle again and carries out component controlling, then ladle is hung into refining station and carries out refining operation, obtain the ultra-low-carbon steel that finished product carbon content is no more than 0.05%.
Description
Technical field
The invention belongs to iron and steel smelting technology fields, are related specifically to the converter of steel grade of the finished product carbon content less than 0.05%
Process for decarbonizing after stove.
Background technology
With the fast development of all trades and professions and the continuous improvement of technology, the composition design of many steel grades is also constantly excellent
To change, especially many low-alloy high-strength steel grades, with the increase of intensity, toughness, plasticity and welding performance etc. are all declining, and
And carbon content it is high when steel in carbon segregation it is more serious, be further degrading the performance of steel.Therefore, this kind of steel grade is at setting up separately
Timing reduces carbon content, to improve the welding performance and corrosion resistance of steel while by increasing alloying element content.Mesh
Before, more and more steel grades in composition design all by carbon content control 0.05% hereinafter, this dramatically increases smelt difficulty.
The steel grade required now this kind of Ultra-low carbon, normal smelting process are exactly to carry out oxygen blast to molten steel in the converter smelting later stage to take off
Carbon, this makes the converter lining service life substantially reduce, while molten steel also being made serious peroxidating occur, and deoxygenation of liquid steel and oxide are mingled with
Removal it is more difficult, be unfavorable for the smelting of clean steel, also considerably increase cost.Ye You small parts iron and steel enterprise is producing this
Vacuum decarburization is used when class steel grade, vacuum decarburization effect is fine, but cost is too high.
Invention content
The purpose of the present invention is to provide process for decarbonizing after a kind of Converter to be subtracted using decarbonization process after Converter
The burden of light converter, prevents the peroxidating of molten steel, improves the cleanliness factor of molten steel, realizes decarburization target in a short time, stablizes life
Output carbon content is 0.05% steel grade below.
Technical scheme of the present invention：
Process for decarbonizing after a kind of Converter, processing step are as follows：
（1）Converter smelting is operated by the normal smelting process of the steel grade, converter terminal Control for Oxygen Content [O] >=500ppm,
Endpoint carbon content of converter controls [C]≤0.08%, outlet temperature >=1600 DEG C；
（2）100 ~ 300kg of lime, 200 ~ 400kg of refined synthetic slag are added into ladle for tapping process, are not added with deoxygenated alloy also not
Carry out alloying, tapping process not slag；
（3）Converter tapping finishes, and ladle is stirred using big argon gas and carries out Decarburization Operation to 5 ~ 10min of agitation of molten steel, when in molten steel
Carbon content stops decarburization when being less than 0.03%；
（4）When molten steel decarburization temperature is inadequate, molten steel can be hung to refining station and carry out warming temperature, be more than when temperature is increased to
200 ~ 300kg lime is added at 1560 DEG C, then big argon gas stirs 3 ~ 5min and carries out further decarburization to molten steel, when
Carbon content in molten steel stops decarburization when being less than 0.03%；
（5）After decarburization, the deoxygenated alloys such as high alumina ferromanganese, mid-carbon fe-mn are added into molten steel to molten steel progress deoxidation and alloy
Change, ladle, which is then hung refining station, carries out refining operation；
（6）Molten steel carries out deoxidation, slag making and alloying operation in refining station, finally obtains carbon content and is no more than 0.05% finished product
Steel.
Wherein refining process molten steel can generally rise carbon 0.007% ~ 0.012%, and the carbon that can generally rise is wrapped during continuous casting
0.003% ~ 0.009%, but the carbon content in finished steel is no more than 0.05%.
The present invention in converter steelmaking process by the steel grade normal operating technique by being controlled, in converter terminal in steel
Oxygen and carbon carry out suitable control, converter tapping process is added suitable suitable slag charge, deoxygenated alloy is not added with, also without alloy
Change, to ensure that molten steel suitable oxygen content in ladle, tapping do not allow slag.Tapping finishes, and ladle is stirred using big argon gas
To molten steel decarburization, when the carbon content in steel reaches≤0.03%, then be added into ladle suitable deoxygenated alloy carry out deoxidation and
Then ladle is hung refining station and carries out refining operation, obtains the Ultra-low carbon that finished product carbon content is no more than 0.05% by alloying
Steel.
The present invention passes through improvement according to the basic principle of carbon-oxygen reaction under the premise of meeting its thermodynamics of reactions condition
The dynamic conditions of C-O reactions, the progress for promoting C-O to react achieve the purpose that decarburization.This not only simplifies smelting process, reduces
Production cost, while the oxide also reduced in steel is mingled with, and improves the cleanliness factor of molten steel, and can make in finished steel
Carbon content stability contorting is below 0.05%.
Description of the drawings
Fig. 1 is the figure of changing using this technique smelting process carbon content.
Specific implementation mode
Embodiment one
Converter enters stove molten iron and first carries out molten iron pretreatment, molten steel sulfur content [S]=0.013% after processing, 1298 DEG C of temperature, molten iron
Molten iron pretreatment slag is taken off totally before entering converter.It is after the previous stove of converter smelting that the residual steel residue in converter is clean, turn
Stove, which is smelted, is added molten iron and steel scrap, molten iron 136t, steel scrap 15t, and it is 0.46% that carbon content, which is 4.86%, Si contents, in molten iron.
The steel grade that converter steelmaking process control routinely requires is operated, and 1628 DEG C of converter terminal temperature, terminal oxygen contains
It is 530 ppm to measure, endpoint carbon content 0.076%, and tapping process carries out pushing off the slag operation, forbids slag of tapping, tapping time
5min, tapping process lime 200kg into ladle, refined synthetic slag 300kg, tapping operate without deoxidation and alloying, go out
Steel is finished carries out big argon gas stirring operation to molten steel, is sampled after stirring 6min.Inspection by sampling carbon content is 0.0264%, carbon
Content is suitable, and high alumina ferromanganese 360kg, mid-carbon fe-mn 150kg are added into ladle and carries out deoxidation alloying to molten steel, then by steel
Packet hangs LF refining station and carries out the refining operations such as further deoxidation, slag making, alloying.LF refining, which finishes, carries out thermometric sampling,
Temperature be 1593 DEG C, carbon content 0.0372%, then by ladle hang VD stoves carry out Fruit storage, VD processing terminate by
Ladle hangs continuous casting station and is poured into a mould, and it is 0.0426% that middle ladle sample, middle ladle sample carbon content are taken after 30 tons of pouring molten steel.
Embodiment two
Converter enters stove molten iron and first carries out molten iron pretreatment, molten steel sulfur content [S]=0.012% after processing, 1295 DEG C of temperature, molten iron
Molten iron pretreatment slag is taken off totally before entering converter.It is after the previous stove of converter smelting that the residual steel residue in converter is clean, turn
Stove, which is smelted, is added molten iron and steel scrap, molten iron 133t, steel scrap 16t, and it is 0.44% that carbon content, which is 4.67%, Si contents, in molten iron.
The steel grade that converter steelmaking process control routinely requires is operated, and 1636 DEG C of converter terminal temperature, terminal oxygen contains
It is 546 ppm to measure, endpoint carbon content 0.065%, and tapping process carries out pushing off the slag operation, forbids slag of tapping.It taps the time
5min, tapping process lime 230kg into ladle, synthetic slag 310kg, tapping are operated without deoxidation and alloying, have been tapped
The big argon gas stirring operations of Bi Jinhang are sampled after stirring 6min.Inspection by sampling carbon content is 0.0237%, and carbon content is suitable, to
High alumina ferromanganese 380kg, mid-carbon fe-mn 160kg are added in ladle, deoxidation alloying is carried out to molten steel, ladle is then hung into LF essences
It refines station and carries out the refining operations such as further deoxidation, slag making, alloying.LF refining, which finishes, carries out thermometric sampling, temperature 1596
DEG C, then ladle is hung VD stoves and carries out Fruit storage by carbon content 0.0358%, VD processing terminates to hang ladle even
Foundry work position is poured into a mould, and it is 0.0406% that middle ladle sample, middle ladle sample carbon content are taken after pouring molten steel 30t.
Claims (1)
1. process for decarbonizing after a kind of Converter, it is characterised in that processing step is as follows：
（1）Converter smelting is operated by the normal smelting process of the steel grade, converter terminal Control for Oxygen Content [O] >=500ppm,
Endpoint carbon content of converter controls [C]≤0.08%, outlet temperature >=1600 DEG C；
（2）100 ~ 300kg of lime, 200 ~ 400kg of refined synthetic slag are added into ladle for tapping process, are not added with deoxygenated alloy also not
Carry out alloying, tapping process not slag；
（3）Converter tapping finishes, and ladle is stirred using big argon gas and carries out Decarburization Operation to 5 ~ 10min of agitation of molten steel, when in molten steel
Carbon content stops decarburization when being less than 0.03%；
（4）When molten steel decarburization temperature is inadequate, molten steel can be hung to refining station and carry out warming temperature, be more than when temperature is increased to
200 ~ 300kg lime is added at 1560 DEG C, then big argon gas stirs 3 ~ 5min and carries out further decarburization to molten steel, works as molten steel
In carbon content be less than 0.03% when stopping decarburization；
（5）After decarburization, the deoxygenated alloys such as high alumina ferromanganese, mid-carbon fe-mn are added into molten steel to molten steel progress deoxidation and alloy
Change, ladle, which is then hung refining station, carries out refining operation；
（6）Molten steel carries out deoxidation, slag making and alloying operation in refining station, finally obtains carbon content and is no more than 0.05% finished product
Steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810494196.2A CN108330251B (en) | 2018-05-22 | 2018-05-22 | Converter post-decarburization process method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810494196.2A CN108330251B (en) | 2018-05-22 | 2018-05-22 | Converter post-decarburization process method |
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| Publication Number | Publication Date |
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| CN108330251A true CN108330251A (en) | 2018-07-27 |
| CN108330251B CN108330251B (en) | 2020-02-07 |
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| CN201810494196.2A Active CN108330251B (en) | 2018-05-22 | 2018-05-22 | Converter post-decarburization process method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113337677A (en) * | 2021-05-12 | 2021-09-03 | 安阳钢铁股份有限公司 | Method for further decarbonizing converter molten steel after tapping and in LF (ladle furnace) process |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599119A (en) * | 1982-07-06 | 1984-01-18 | Sumitomo Metal Ind Ltd | Manufacture of low carbon steel |
| KR20050014467A (en) * | 2003-07-31 | 2005-02-07 | 주식회사 포스코 | Method for rising temperature of converter |
| CN101215618A (en) * | 2007-12-27 | 2008-07-09 | 本钢板材股份有限公司 | Method for smelting ultra-low-carbon steel |
| CN102965469A (en) * | 2012-11-26 | 2013-03-13 | 湖南华菱湘潭钢铁有限公司 | Smelting control method by utilizing inclusion of reoxides in steel |
| CN103911487A (en) * | 2012-12-31 | 2014-07-09 | 攀钢集团攀枝花钢钒有限公司 | Method for smelting of ultra-low carbon steel and continuous casting method for ultra-low carbon steel |
| CN105886694A (en) * | 2016-07-04 | 2016-08-24 | 湖南华菱湘潭钢铁有限公司 | Ultra-low phosphorus moulded steel smelting method |
| CN105986063A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for producing cold-rolled sheet SPHD by VD |
-
2018
- 2018-05-22 CN CN201810494196.2A patent/CN108330251B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599119A (en) * | 1982-07-06 | 1984-01-18 | Sumitomo Metal Ind Ltd | Manufacture of low carbon steel |
| KR20050014467A (en) * | 2003-07-31 | 2005-02-07 | 주식회사 포스코 | Method for rising temperature of converter |
| CN101215618A (en) * | 2007-12-27 | 2008-07-09 | 本钢板材股份有限公司 | Method for smelting ultra-low-carbon steel |
| CN102965469A (en) * | 2012-11-26 | 2013-03-13 | 湖南华菱湘潭钢铁有限公司 | Smelting control method by utilizing inclusion of reoxides in steel |
| CN103911487A (en) * | 2012-12-31 | 2014-07-09 | 攀钢集团攀枝花钢钒有限公司 | Method for smelting of ultra-low carbon steel and continuous casting method for ultra-low carbon steel |
| CN105986063A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for producing cold-rolled sheet SPHD by VD |
| CN105886694A (en) * | 2016-07-04 | 2016-08-24 | 湖南华菱湘潭钢铁有限公司 | Ultra-low phosphorus moulded steel smelting method |
Non-Patent Citations (2)
| Title |
|---|
| 俞海明: "《转炉钢水的炉外精炼技术》", 31 August 2011, 冶金工业出版社 * |
| 杜长坤: "《冶金工程概论》", 30 April 2014, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113337677A (en) * | 2021-05-12 | 2021-09-03 | 安阳钢铁股份有限公司 | Method for further decarbonizing converter molten steel after tapping and in LF (ladle furnace) process |
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| Publication number | Publication date |
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| CN108330251B (en) | 2020-02-07 |
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