CN102443680A - Method for preventing flocculation flow of first tank of aluminum killed steel produced by medium-thin slab continuous casting machine - Google Patents
Method for preventing flocculation flow of first tank of aluminum killed steel produced by medium-thin slab continuous casting machine Download PDFInfo
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- CN102443680A CN102443680A CN2011104034592A CN201110403459A CN102443680A CN 102443680 A CN102443680 A CN 102443680A CN 2011104034592 A CN2011104034592 A CN 2011104034592A CN 201110403459 A CN201110403459 A CN 201110403459A CN 102443680 A CN102443680 A CN 102443680A
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- Prior art keywords
- tundish
- argon
- controlled
- killed steel
- medium
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- 238000000034 method Methods 0.000 title claims abstract description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 15
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 14
- 238000009749 continuous casting Methods 0.000 title abstract description 4
- 230000016615 flocculation Effects 0.000 title abstract 2
- 238000005189 flocculation Methods 0.000 title abstract 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052786 argon Inorganic materials 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 6
- 239000011575 calcium Substances 0.000 claims abstract description 6
- 239000004411 aluminium Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000002791 soaking Methods 0.000 abstract 1
- 238000007670 refining Methods 0.000 description 9
- 229920000742 Cotton Polymers 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005008 domestic process Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 208000018875 hypoxemia Diseases 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a method for preventing flocculation flow of an initial tank of an aluminum killed steel produced by a medium-thin slab continuous casting machine, wherein the desulfurization rate of the initial tank of an LF furnace reaches more than 80%; weak argon blowing stirring is adopted during wire feeding, the stirring time is controlled to be 5-10min, and the weight percentage of calcium in molten steel after wire feeding is more than or equal to 0.0020 percent; the baking temperature of the tundish is more than or equal to 1100 ℃; the baking temperature of the soaking water inlet is more than or equal to 1100 ℃; the time interval from the lifting of the tundish roaster to the casting is less than 5min, and the argon test blowing operation is carried out before the water feeding port is installed; argon is introduced before the pouring of the tundish, and the reducing atmosphere in the tundish is maintained. Therefore, the top slag can generate good adsorption effect on the inclusion, the inclusion can be promoted to float sufficiently, the generation of the floc flow can be controlled, the floc flow proportion of the first tank of the aluminum killed steel produced by the sheet billet caster in the LF furnace treatment can be reduced from 50% to 2%, the casting failure caused by the floc flow can be avoided, and the stability of the steelmaking production process can be ensured.
Description
Technical field
The invention belongs to continuous casting refinery practice field, relate in particular to a kind of medium and thin slab continuous caster that is used for ladle refining furnace (being the LF stove) processing and produce the method that aluminium killed steel prevents that first jar of generation wadding from flowing.
Background technology
The LF stove is the refining unit that grows up in Japan at the initial stage seventies.Because its equipment is simple, investment cost is low, and flexible operation and refining effect are good and become the up-and-coming youngster of metallurgy industry, and have worldwide obtained using widely and developing.The white slag in the ladle is mainly leaned in the refining of LF stove, and blowing argon gas stirs in ladle in the atmosphere of hypoxemia, and by Graphite Electrodes the molten steel through first furnace is heated and refining.Because argon gas stirs and quickened the chemical reaction between slag one steel, carries out temperature compensation with electric-arc heating, can guarantee the refining time of long period, thereby reduce oxygen, sulphur content in the steel.
Casting machine wadding stream refers generally to immerse mouth of a river inwall and adheres to Al
2O
3Deng inclusion and the latch up phenomenon that takes place.Nozzle clogging mechanism: casting contains aluminum steel water, and nozzle clogging often takes place, and can cause beam to interrupt when serious, the direct motion of influence casting.For Al
2O
3The inclusion reason of on the inwall of the mouth of a river, adhering to, generally believe: steel flow is when the mouth of a river, and molten steel flow speed is parabolic distribution on the transverse section, the mouth of a river, and is very low near near the flow velocity wall of the mouth of a river, impels solid Al
2O
3Be mingled with to be deposited on the wall of the mouth of a river and also grow up until obstruction gradually.
The domestic method of improving the continuous casting steel casting properties has: 1, non-metallic inclusion is removed to extremely low-level.2, non-metallic inclusion is carried out denaturing treatment, promptly calcium is handled, to alleviate and to eliminate its harmful effect.
For casting machine is medium and thin slab continuous caster, and slab thickness is divided into 135mm and two kinds of specifications of 170mm.Adopt the flat mouth of a river.Because the reason of mouth of a river shape, the molten steel of the same terms, the casting properties that on medium and thin slab continuous caster, shows will be worse than conventional slab caster.In casting cycle, be easy to nozzle clogging takes place and cause the stream of wadding a quilt with cotton.Particularly produce the first jar of aluminium killed steel and take place more easily to wad a quilt with cotton to flow, reason is: at first, tundish is through the coal gas baking, and the interior oxidisability of bag is more intense, and the Als in the meeting oxidation molten steel generates Al
2O
3Be mingled with, on the wall of the mouth of a river.Secondly, more much lower because of the temperature that unwrap when watering the centre than the temperature of molten steel, cause the liquid steel temperature that gets into tundish to reduce mobile variation.Because above two reasons, wadding stream takes place in the aluminium killed steel that medium and thin slab continuous caster is produced first jar more easily, and wadding stream is serious, even causes the disconnected accident of watering.
Summary of the invention
The object of the invention aim to provide a kind of when effectively preventing to handle the aluminium killed steel that medium and thin slab continuous caster produces first jar the wadding flow phenomenon takes place; The method of stream thereby the disconnected accident of watering that the conductance of avoiding wadding a quilt with cotton causes, the first jar of aluminium killed steel that guarantees the medium and thin slab continuous caster production that refining process is stable prevent to wad a quilt with cotton.
For this reason, the solution that the present invention taked is:
A kind of medium and thin slab continuous caster is produced the method for first jar of anti-wadding stream of aluminium killed steel, it is characterized in that:
(1), first jar of desulfurization degree of LF stove treatment process reaches more than 80%;
(2), adopt during line feeding weak Argon to stir, argon flow amount is controlled at 30-40Nm
3/ h, the weight percent of calcium>=0.0020% in the molten steel after the line feeding;
(3), weak Argon churning time is controlled at 5-10min after the line feeding;
(4), tundish storing temperature >=1100 ℃;
(5), immerse mouth of a river storing temperature >=1100 ℃;
(6), be raised to open from the tundish roaster and water pitch time＜5 min;
(7), tundish upper nozzle tries the Argon operation before installing, and guarantees the filling pipe end good air permeability, especially filling pipe end bowl portion must breathe freely;
(8), the centre leads to argon gas before unwrapping and watering, the reducing atmosphere in the maintenance tundish.
Positively effect of the present invention is:
Embodiment of the present invention can make the top slag that inclusion is produced the good adsorption effect; And impel inclusion fully to float; The condition that control wadding stream generates; Thereby the ratio of wadding stream takes place the first jar of aluminium killed steel that makes the LF stove handle the production of medium thin slab casting machine is reduced to 2% by 50%, has avoided having guaranteed the stable of STEELMAKING PRODUCTION process owing to wadding flows the disconnected accident of watering that causes.
Embodiment
Embodiment 1:
Refining adopts the LF stove to handle, and steel grade is an aluminium killed steel.
Its concrete control method and step are:
1, the desulfurization degree of the first jar of control LF stove treatment process, first jar of desulfurization degree of LF stove treatment process reaches 82%.
2, adopt during line feeding weak Argon to stir, argon flow amount is controlled at 30Nm
3/ h, after the line feeding in the molten steel weight percent of calcium be controlled at 0.0030%.
3, weak Argon churning time is controlled at 10min after the line feeding, does not add steel scrap after the line feeding, and carrying out argon flow amount is 60Nm
3The big argon flow amount of/h stirs.
4, the tundish storing temperature is controlled at 1180 ℃.
5, immerse mouth of a river storing temperature and be controlled at 1180 ℃.
6, be raised to open from the tundish roaster and water min pitch times 4.5.
7, try the Argon operation before tundish upper nozzle is installed, filling pipe end bowl portion is ventilative, guarantees the filling pipe end good air permeability.
8, logical argon gas kept the reducing atmosphere in the tundish before the centre was unwrapped and watered.
Simultaneously, should guarantee ladle as far as possible, avoid ladle to adopt and burn the oxygen drainage from opening.
Embodiment 2:
Refining adopts the LF stove to handle, and steel grade is an aluminium killed steel.
Its concrete control method and step are:
1, the desulfurization degree of the first jar of control LF stove treatment process, first jar of desulfurization degree of LF stove treatment process reaches 81%.
2, adopt during line feeding weak Argon to stir, argon flow amount is controlled at 38Nm
3/ h, after the line feeding in the molten steel weight percent of calcium be controlled at 0.0050%.
3, weak Argon churning time is controlled at 7min after the line feeding, does not add steel scrap after the line feeding, and carrying out argon flow amount is 75Nm
3The big argon flow amount of/h stirs.
4, the tundish storing temperature is controlled at 1150 ℃.
5, immerse mouth of a river storing temperature and be controlled at 1150 ℃.
6, be raised to open from the tundish roaster and water min pitch times 4.
7, try the Argon operation before tundish upper nozzle is installed, filling pipe end bowl portion is ventilative, guarantees the filling pipe end good air permeability.
8, logical argon gas kept the reducing atmosphere in the tundish before the centre was unwrapped and watered.
Simultaneously, guarantee ladle as far as possible, avoid ladle to adopt and burn the oxygen drainage from opening.
Claims (1)
1. a medium and thin slab continuous caster is produced the method that first jar of anti-wadding of aluminium killed steel flows, and it is characterized in that:
(1), first jar of desulfurization degree of LF stove treatment process reaches more than 80%;
(2), adopt during line feeding weak Argon to stir, argon flow amount is controlled at 30-40Nm
3/ h, the weight percent of calcium>=0.0020% in the molten steel after the line feeding;
(3), weak Argon churning time is controlled at 5-10min after the line feeding;
(4), tundish storing temperature >=1100 ℃;
(5), immerse mouth of a river storing temperature >=1100 ℃;
(6), be raised to open from the tundish roaster and water pitch time＜5 min;
(7), tundish upper nozzle tries the Argon operation before installing, and guarantees the filling pipe end good air permeability, especially filling pipe end bowl portion must breathe freely;
(8), the centre leads to argon gas before unwrapping and watering, the reducing atmosphere in the maintenance tundish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104034592A CN102443680A (en) | 2011-12-07 | 2011-12-07 | Method for preventing flocculation flow of first tank of aluminum killed steel produced by medium-thin slab continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104034592A CN102443680A (en) | 2011-12-07 | 2011-12-07 | Method for preventing flocculation flow of first tank of aluminum killed steel produced by medium-thin slab continuous casting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102443680A true CN102443680A (en) | 2012-05-09 |
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|---|---|---|---|
| CN2011104034592A Pending CN102443680A (en) | 2011-12-07 | 2011-12-07 | Method for preventing flocculation flow of first tank of aluminum killed steel produced by medium-thin slab continuous casting machine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273033A (en) * | 2013-06-06 | 2013-09-04 | 鞍钢股份有限公司 | Remediation method for square billet uniflow casting interruption |
| CN109022680A (en) * | 2017-06-12 | 2018-12-18 | 鞍钢股份有限公司 | Method for preventing first tank low-silicon aluminum killed steel from flocculating |
| CN110295268A (en) * | 2019-06-17 | 2019-10-01 | 首钢集团有限公司 | A method of obtaining single heat argon blowing rate |
| CN112517898A (en) * | 2020-09-11 | 2021-03-19 | 南京钢铁股份有限公司 | Continuous casting tundish baking operation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273033A (en) * | 2013-06-06 | 2013-09-04 | 鞍钢股份有限公司 | Remediation method for square billet uniflow casting interruption |
| CN109022680A (en) * | 2017-06-12 | 2018-12-18 | 鞍钢股份有限公司 | Method for preventing first tank low-silicon aluminum killed steel from flocculating |
| CN109022680B (en) * | 2017-06-12 | 2020-05-29 | 鞍钢股份有限公司 | Method for preventing first tank low-silicon aluminum killed steel from flocculating |
| CN110295268A (en) * | 2019-06-17 | 2019-10-01 | 首钢集团有限公司 | A method of obtaining single heat argon blowing rate |
| CN112517898A (en) * | 2020-09-11 | 2021-03-19 | 南京钢铁股份有限公司 | Continuous casting tundish baking operation method |
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Application publication date: 20120509 |