CN104060046B - A kind of calcium line feeding method prevented in the nitrogen pick-up of argon station - Google Patents
A kind of calcium line feeding method prevented in the nitrogen pick-up of argon station Download PDFInfo
- Publication number
- CN104060046B CN104060046B CN201410316298.7A CN201410316298A CN104060046B CN 104060046 B CN104060046 B CN 104060046B CN 201410316298 A CN201410316298 A CN 201410316298A CN 104060046 B CN104060046 B CN 104060046B
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- Prior art keywords
- argon
- calcium line
- molten steel
- steel
- station
- Prior art date
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 59
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 51
- 239000011575 calcium Substances 0.000 title claims abstract description 51
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 238000007664 blowing Methods 0.000 claims abstract description 11
- XMPZLAQHPIBDSO-UHFFFAOYSA-N argon dimer Chemical compound [Ar].[Ar] XMPZLAQHPIBDSO-UHFFFAOYSA-N 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000007423 decrease Effects 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 238000011112 process operation Methods 0.000 claims abstract description 7
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 238000002309 gasification Methods 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 238000007670 refining Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Prevent the calcium line feeding method in the nitrogen pick-up of argon station, its step: after molten steel arrives argon station, the oxygen level in the molten steel that composition and temperature adjust controls at below 20PPm; Decline steel ladle cover, makes the upper edge of ladle contact with the thermofin of steel ladle cover lower surface to be formed to close; In ladle bottom Argon; Start to feed calcium line after argon blowing time is not less than 2 minutes; Carry out increasing argon Argon; Steel ladle cover is moved to holding fix, and stops Argon, carry out lower process operations.The present invention, after argon station feeding calcium line, makes molten steel drop to below 2ppm because of the nitrogen pick-up of feeding calcium line by original about 9ppm, significantly improve the cleanliness factor of molten steel, and technique is easy to control, simple to operate.
Description
Technical field
The present invention relates to a kind of method preventing impurity from increasing in steel-making, belong to a kind of calcium line feeding method prevented in the nitrogen pick-up of argon station particularly.
Background technology
At present, for needing the molten steel carrying out Calcium treatment, the feeding major part of calcium line is carried out in refining latter stage.Calcium treatment can carry out sex change to inclusion on the one hand, can promote the purification of molten steel on the other hand.But because calcium belongs to the element being very easily oxidized and gasifying, the temperature of molten steel when refining belongs to high temperature again, the gasification of calcium is difficult to avoid, therefore the gasification of calcium and oxidation cause the local boiling of molten steel surface when adding calcium line, thus involve in air, cause the secondary oxidation of molten steel, make molten steel [N], [O] content increase and reduce Cleanliness of Molten Steel.
Through retrieval, generally add the molten steel pollution that calcium line causes because of gasification oxidation, make [N] in molten steel increase about 9ppm, should be avoided.
Summary of the invention
The present invention is directed to prior art, namely feeding calcium line is carried out latter stage in refining, calcium is caused to be oxidized due to high temperature and gasification, thus make the gasification of calcium and oxidation cause the local boiling of molten steel surface and involve in air, cause the deficiency of the secondary oxidation of molten steel, there is provided a kind of by argon station feeding calcium line, make molten steel be dropped to the calcium line feeding method prevented in the nitrogen pick-up of argon station of below 2ppm by original about 9ppm because of the nitrogen pick-up of hello calcium line.
The application to achieve these goals, the technique of the object realizing the application is conducted in-depth research, its result: at argon station feeding calcium line: by forming the space of relative closure between ladle and steel ladle cover, and by blowing a certain amount of argon gas within a certain period of time to get rid of the air of the inside, and to be formed in enclosed space be malleation, the air of outside can not be entered, although calcium generating gasification, molten steel can not be produced and produce secondary oxidation problem.Therefore existing problem can be made to be resolved, molten steel drops to below 2ppm because feeding the nitrogen pick-up of calcium line by original about 9ppm.
Realize the measure of above-mentioned purpose:
Prevent the calcium line feeding method in the nitrogen pick-up of argon station, its step:
1), after molten steel arrives argon station, the oxygen level in the molten steel that composition and temperature adjust controls at below 20PPm;
2) decline steel ladle cover, makes the upper edge of ladle contact with the thermofin of steel ladle cover lower surface to be formed to close;
3) in ladle bottom Argon, flow is controlled at 10 ~ 20Nm
3/ h;
4) after argon blowing time is not less than 2 minutes, start to feed calcium line, feeding speed controls at 230 ~ 280 ms/min;
5), after hello calcium line terminates, increasing argon Argon is carried out: argon flow amount increases to 30 ~ 35Nm
3/ h, argon blowing time is not less than 3 minutes;
6) steel ladle cover is moved to holding fix, and stop Argon, carry out lower process operations.
The effect of master operation in the present invention
Why taking that the upper edge of ladle is contacted with the thermofin of steel ladle cover lower surface and formed to close, is because after being formed and closing, by Argon, the air of enclosed space can be got rid of and form malleation, prevent entering of air;
Feeding after calcium line terminates, carry out increasing argon Argon, and control argon flow amount and increase to 30 ~ 35Nm
3/ h, argon blowing time is not less than 3 minutes, is to prevent air from entering enclosed space because on the one hand can form malleation, on the other hand can well the evenly distribution of calcium in molten steel, obtains the effect of Calcium treatment.
The present invention compared with prior art, after argon station feeding calcium line, makes molten steel drop to below 2ppm because of the nitrogen pick-up of feeding calcium line by original about 9ppm, significantly improve the cleanliness factor of molten steel, and technique is easy to control, simple to operate.
Embodiment
Below the present invention is described in detail:
Embodiment 1
Prevent the calcium line feeding method in the nitrogen pick-up of argon station, its step:
1), after molten steel arrives argon station, the oxygen level in the molten steel that composition and temperature adjust is 18PPm;
2) decline steel ladle cover, makes the upper edge of ladle contact with the thermofin of steel ladle cover lower surface to be formed to close;
3) in ladle bottom Argon, flow is 10 ~ 11Nm
3/ h;
4) after Argon was by 2.2 minutes, start to feed calcium line, feeding speed is at 251 ms/min;
5), after hello calcium line terminates, increasing argon Argon is carried out: argon flow amount increases to 32Nm
3/ h, argon blowing time is 3 minutes;
6) steel ladle cover is moved to holding fix, and stop Argon, carry out lower process operations.
After testing, molten steel drops to 2ppm because feeding the nitrogen pick-up of calcium line by original about 9ppm.
Embodiment 2
Prevent the calcium line feeding method in the nitrogen pick-up of argon station, its step:
1), after molten steel arrives argon station, the oxygen level in the molten steel that composition and temperature adjust is 16PPm;
2) decline steel ladle cover, makes the upper edge of ladle contact with the thermofin of steel ladle cover lower surface to be formed to close;
3) in ladle bottom Argon, flow is 13.5 ~ 14.5Nm
3/ h;
4) after Argon was by 2.5 minutes, start to feed calcium line, feeding speed is at 231 ms/min;
5), after hello calcium line terminates, increasing argon Argon is carried out: argon flow amount increases to 30Nm
3/ h, argon blowing time is 3.3 minutes;
6) steel ladle cover is moved to holding fix, and stop Argon, carry out lower process operations.
After testing, molten steel drops to 1.8ppm because feeding the nitrogen pick-up of calcium line.
Embodiment 3
Prevent the calcium line feeding method in the nitrogen pick-up of argon station, its step:
1), after molten steel arrives argon station, the oxygen level in the molten steel that composition and temperature adjust is 17PPm;
2) decline steel ladle cover, makes the upper edge of ladle contact with the thermofin of steel ladle cover lower surface to be formed to close;
3) in ladle bottom Argon, flow is 16.5 ~ 17Nm
3/ h;
4) after Argon was by 3 minutes, start to feed calcium line, feeding speed is at 265 ms/min;
5), after hello calcium line terminates, increasing argon Argon is carried out: argon flow amount increases to 35Nm
3/ h, argon blowing time is 3.2 minutes;
6) steel ladle cover is moved to holding fix, and stop Argon, carry out lower process operations.
After testing, molten steel drops to 1.9ppm because feeding the nitrogen pick-up of calcium line.
Embodiment 4
Prevent the calcium line feeding method in the nitrogen pick-up of argon station, its step:
1), after molten steel arrives argon station, the oxygen level in the molten steel that composition and temperature adjust is 18PPm;
2) decline steel ladle cover, makes the upper edge of ladle contact with the thermofin of steel ladle cover lower surface to be formed to close;
3) in ladle bottom Argon, flow is 19 ~ 20Nm
3/ h;
4) after Argon was by 2.6 minutes, start to feed calcium line, feeding speed is at 278 ms/min;
5), after hello calcium line terminates, increasing argon Argon is carried out: argon flow amount increases to 34Nm
3/ h, argon blowing time is 3.5 minutes;
6) steel ladle cover is moved to holding fix, and stop Argon, carry out lower process operations.
After testing, molten steel drops to 1.5ppm because feeding the nitrogen pick-up of calcium line.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. prevent the calcium line feeding method in the nitrogen pick-up of argon station, its step:
1), after molten steel arrives argon station, the oxygen level in the molten steel that composition and temperature adjust controls at below 20PPm;
2) decline steel ladle cover, makes the upper edge of ladle contact with the thermofin of steel ladle cover lower surface to be formed to close;
3) in ladle bottom Argon, flow is controlled at 10 ~ 20Nm
3/ h;
4) after argon blowing time is not less than 2 minutes, start to feed calcium line, feeding speed controls at 230 ~ 280 ms/min;
5), after hello calcium line terminates, increasing argon Argon is carried out: argon flow amount increases to 30 ~ 35Nm
3/ h, argon blowing time is not less than 3 minutes;
6) steel ladle cover is moved to holding fix, and stop Argon, carry out lower process operations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410316298.7A CN104060046B (en) | 2014-07-04 | 2014-07-04 | A kind of calcium line feeding method prevented in the nitrogen pick-up of argon station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410316298.7A CN104060046B (en) | 2014-07-04 | 2014-07-04 | A kind of calcium line feeding method prevented in the nitrogen pick-up of argon station |
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| Publication Number | Publication Date |
|---|---|
| CN104060046A CN104060046A (en) | 2014-09-24 |
| CN104060046B true CN104060046B (en) | 2016-03-09 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545028A (en) * | 2008-03-24 | 2009-09-30 | 宝山钢铁股份有限公司 | Multifunctional vacuum refining process |
| CN101892356A (en) * | 2010-07-21 | 2010-11-24 | 中国重型机械研究院有限公司 | Argon blowing protection system |
| CN102559983A (en) * | 2010-12-15 | 2012-07-11 | 鞍钢股份有限公司 | Method for preventing nitrogen increase of molten steel in converter tapping process |
| CN102690927A (en) * | 2012-06-18 | 2012-09-26 | 辽宁科技大学 | Method for recycling argon from LF ladle refining furnace |
| CN103103314A (en) * | 2012-12-18 | 2013-05-15 | 济钢集团有限公司 | Method for reducing nitrogen increment of molten steel in refining process |
-
2014
- 2014-07-04 CN CN201410316298.7A patent/CN104060046B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545028A (en) * | 2008-03-24 | 2009-09-30 | 宝山钢铁股份有限公司 | Multifunctional vacuum refining process |
| CN101892356A (en) * | 2010-07-21 | 2010-11-24 | 中国重型机械研究院有限公司 | Argon blowing protection system |
| CN102559983A (en) * | 2010-12-15 | 2012-07-11 | 鞍钢股份有限公司 | Method for preventing nitrogen increase of molten steel in converter tapping process |
| CN102690927A (en) * | 2012-06-18 | 2012-09-26 | 辽宁科技大学 | Method for recycling argon from LF ladle refining furnace |
| CN103103314A (en) * | 2012-12-18 | 2013-05-15 | 济钢集团有限公司 | Method for reducing nitrogen increment of molten steel in refining process |
Non-Patent Citations (1)
| Title |
|---|
| 《VD过程钢液氮含量控制工艺研究与实践》;刘向东 等;《炼钢》;20121031;第28卷(第5期);32-34 * |
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| CN104060046A (en) | 2014-09-24 |
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Effective date of registration: 20170809 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |