CN102899456A - Method for reducing nitrogen increase of molten steel in refined-smelting ladle furnace (LF) in heating process - Google Patents
Method for reducing nitrogen increase of molten steel in refined-smelting ladle furnace (LF) in heating process Download PDFInfo
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- CN102899456A CN102899456A CN2012103612528A CN201210361252A CN102899456A CN 102899456 A CN102899456 A CN 102899456A CN 2012103612528 A CN2012103612528 A CN 2012103612528A CN 201210361252 A CN201210361252 A CN 201210361252A CN 102899456 A CN102899456 A CN 102899456A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a method for reducing nitrogen increase of molten steel in a refined-smelting ladle furnace (LF) in a heating process. The center of each of three electrodes is provided with an argon hole, the circumference of the lower edge of a furnace cover is provided with an argon ring pipe provided with argon blowing holes, and the argon holes and the argon ring pipe are respectively connected through a gas inlet hose and an argon pipeline. In the molten steel treatment process of the LF, argon is blown into the furnace respectively through the electrode argon holes and the argon blowing holes in the argon ring pipe. In the heating process of the LF, the speed of a dust removal blower is reduced to 30-70% of the normal speed, and foaming white lime is added to molten steel by 1-3 batches, wherein 1-3kg of foaming white lime is added to every ton of molten steel for each batch. The invention can control the nitrogen increase mass percent of molten steel for one minute on average in the heating process to be lower than 0.00003%, reduce the nitrogen increase of the LF in the heating process, improve the submerged arc effect, relieve the influence of the molten steel nitrogen increase on the quality of the molten steel, and improve the quality of the molten steel treated by the LF.
Description
Technical field
The invention belongs to the process for making technical field, be specifically related to a kind of method that in ladle refining furnace (LF stove) refining process, reduces molten steel heating nitrogen pick-up.
Background technology
The LF stove is one of Main Means of present steel secondary refining, and it has the several functions such as submerged arc heating, Argon stirring, slag making, deoxidation and alloying, for raising steel quality, adjusting rhythm of production very important effect is arranged all.The LF stove be adopt electric furnace reduction period principle design out, its outstanding advantages is high efficiency slag making desulfurization, has very strong advantage for super low sulfur steel grades such as production flow line steel.Simultaneously, owing to adopting the electric-arc heating molten steel, the technique that contrast adopts " aluminium-oxygen " or materials such as " silicon-oxygen " to carry out the molten steel chemical heating is compared, and the impact that can not cause the metal oxide such as aluminium sesquioxide that molten steel is mingled with has improved the purity of molten steel.
Yet, since the LF stove in carrying out the electric-arc heating temperature-rise period can because electric arc to air in the ionizing event of nitrogen, be easy to cause the nitrogen pick-up of molten steel, for most of steel grade, nitrogen content there is strict requirement, the quality of too much nitrogen pick-up meeting remarkably influenced steel, and have influence on the final correlated performance of steel.Therefore be necessary to study a kind of method of effective control LF stove intensification nitrogen pick-up, process the quality of molten steel to improve the LF stove.
Summary of the invention
The present invention aims to provide a kind of method that can effectively control nitrogen pick-up in the LF stove molten steel heating process, thereby improves the submerged arc effect, reduces the molten steel nitrogen increased amount, alleviates because molten steel nitrogen pick-up on the impact of steel quality, improves the quality that the LF stove is processed molten steel.
For this reason, the present invention has taked following solution:
A kind of method that reduces the nitrogen pick-up of ladle refining furnace molten steel heating, its concrete grammar is:
1, be that the center of LF stove three root graphite electrodes processes respectively an argon gas hole at ladle refining furnace, the argon gas hole is by hose connection argon gas pipeline; When the LF stove is processed molten steel, in stove, be blown into argon gas by Graphite Electrodes argon gas hole, the argon gas supply gas pressure is controlled at 0.4-0.8MPa, and the argon flow amount in each argon gas hole is controlled at 20-200 l/min.
2, along circumference the argon gas endless tube is installed under LF stove bell, is evenly equipped with 10-50 argon blowing hole on the argon gas endless tube, the argon blowing hole opening direction is towards the gap of bell and ladle, and the argon gas endless tube is connected with the argon gas pipeline by air induction hose; When the LF stove was processed molten steel, the argon blowing hole below bell on the argon gas endless tube carried out Argon, and argon pressure is controlled at 0.4-0.8MPa, and the Argon amount of whole argon gas endless tube is controlled at 250-500 l/min.
3, in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to the 30-70% of maximum speed of revolution, makes the furnace gas pressure-fired in the LF stove; And in molten steel, divide a 1-3 to criticize adding foaming lime, every batch of add-on is that steel per ton adds 1-3kg; In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution, use lime as sludging flux.
Described foaming lime means the lime of not grilling thoroughly fully, CaCO in the foaming lime
3Mass percentage content is 10-20%.
Beneficial effect of the present invention is:
Adopt the present invention can control the mass percent of average interior molten steel nitrogen increased amount of per minute heating-up time in the temperature-rise period below 0.00003%, thereby reduce the nitrogen pick-up of LF stove in temperature-rise period, improve the submerged arc effect, alleviate because molten steel nitrogen pick-up on the impact of steel quality, improves the quality that the LF stove is processed molten steel.
Description of drawings
Fig. 1 is the electrode schematic diagram with the argon gas hole.
Fig. 2 is the LF stove bell upward view with the argon gas endless tube.
Among the figure: flexible pipe 1, electrode 2, argon gas hole 3, bell 4, argon gas endless tube 5, air induction hose 6.
Embodiment
Take 180 tons of LF stoves, processing steel grade Q235B as example, the present invention will be further described.
Before the enforcement, 3, three the argon gas holes 3, argon gas hole that at first process respectively a diameter at the center of LF stove three root graphite electrodes 2 and be 5-10mm are connected on the argon gas pipeline by flexible pipe 1 respectively.Then along circumference argon gas endless tube 5 is installed at the lower of LF stove bell 4, the argon blowing hole that to be evenly equipped with 10-50 diameter on the argon gas endless tube 5 be 2-5mm, the argon blowing hole opening direction is towards the gap of bell 4 with ladle, and argon gas endless tube 5 is connected with the argon gas pipeline by air induction hose 6.
Embodiment 1:
1, when the LF stove is processed molten steel, be blown into argon gas by argon gas hole 3 in stove, the argon gas supply gas pressure is controlled at 0.4MPa, and the argon flow amount in each argon gas hole is controlled at 50 l/min.In the molten steel heating process, because argon gas is blown near the arc zone by the center of electrode 2, has reduced air and participated in the probability of ionization nitrogen pick-up, thereby reduced the nitrogen pick-up of molten steel.
When 2, the LF stove is processed molten steel, carry out Argon by the argon blowing hole on the argon gas endless tube 5, argon pressure is controlled at 0.5MPa, and the Argon amount of whole argon gas endless tube 5 is controlled at 250 l/min, thereby can reduce the air concentration in the stove, the nitrogen pick-up of control molten steel.
3, in the LF stove temperature-rise period, it is 442rpm that the rotating speed of dedusting fan is down to 66% of maximum speed of revolution, makes the furnace gas pressure-fired in the LF stove, avoids the temperature-rise period Air to be drawn in the LF stove by the slit between bell 4 and the ladle, reduces molten steel nitrogen pick-up.
Simultaneously, disposable adding contains CaCO in the molten steel
3Mass percent is 16% foaming lime 200 kg, by CaCO in the foaming lime
3The effect of reducing foaming, form good foamy slag, thereby improve the submerged arc effect, reduce the contact probability of electric arc and air, the nitrogen pick-up of minimizing molten steel.In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution 670 rpm, use lime as sludging flux.
After implementing as stated above, the initial nitrogen content mass percent of LF stove is 0.0026%, and finishing the nitrogen content mass percent is 0.0027%.
Embodiment 2:
1, when the LF stove is processed molten steel, be blown into argon gas by argon gas hole 3 in stove, the argon gas supply gas pressure is controlled at 0.7MPa, and the argon flow amount in each argon gas hole is controlled at 90 l/min.In the molten steel heating process, because argon gas is blown near the arc zone by the center of electrode 2, reduced the probability that air participates in ionization nitrogen pick-up.
When 2, the LF stove is processed molten steel, carry out Argon by the argon blowing hole on the argon gas endless tube 5, argon pressure is controlled at 0.6MPa, and the Argon amount of whole argon gas endless tube 5 is controlled at 300 l/min, reduces the air concentration in the stove.
3, in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to 389rpm, makes the furnace gas pressure-fired in the LF stove, avoid the temperature-rise period Air to be drawn in the LF stove by the slit between bell 4 and the ladle.
Simultaneously, add in two batches in the molten steel and contain CaCO
3Mass percent is 20% foaming lime, and every batch adds 225 kg, by CaCO in the foaming lime
3The effect of reducing foaming, form good foamy slag, thereby improve the submerged arc effect, reduce the contact probability of electric arc and air.In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution 670 rpm, use lime as sludging flux.
After implementing as stated above, the initial nitrogen content mass percent of LF stove is 0.0021%, and finishing the nitrogen content mass percent is 0.0024%.
Embodiment 3:
1, when the LF stove is processed molten steel, be blown into argon gas by argon gas hole 3 in stove, the argon gas supply gas pressure is controlled at 0.8MPa, and the argon flow amount in each argon gas hole is controlled at 150 l/min.In the molten steel heating process, because argon gas is blown near the arc zone by the center of electrode 2, reduced the probability that air participates in ionization nitrogen pick-up.
When 2, the LF stove is processed molten steel, carry out Argon by the argon blowing hole on the argon gas endless tube 5, argon pressure is controlled at 0.7MPa, and the Argon amount of whole argon gas endless tube 5 is controlled at 420 l/min, reduces the air concentration in the stove.
3, in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to 268rpm, makes the furnace gas pressure-fired in the LF stove, avoid the temperature-rise period Air to be drawn in the LF stove by the slit between bell 4 and the ladle.
Simultaneously, add in two batches in the molten steel and contain CaCO
3Mass percent is 12% foaming lime, and every batch adds 355 kg, by CaCO in the foaming lime
3The effect of reducing foaming, form good foamy slag, thereby improve the submerged arc effect, reduce the contact probability of electric arc and air.In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution 670 rpm, use lime as sludging flux.
After implementing as stated above, the initial nitrogen content mass percent of LF stove is 0.0019%, and finishing the nitrogen content mass percent is 0.0023%.
Embodiment 4:
1, when the LF stove is processed molten steel, be blown into argon gas by argon gas hole 3 in stove, the argon gas supply gas pressure is controlled at 0.5MPa, and the argon flow amount in each argon gas hole is controlled at 190 l/min.In the molten steel heating process, because argon gas is blown near the arc zone by the center of electrode 2, reduced the probability that air participates in ionization nitrogen pick-up.
When 2, the LF stove is processed molten steel, carry out Argon by the argon blowing hole on the argon gas endless tube 5, argon pressure is controlled at 0.8MPa, and the Argon amount of whole argon gas endless tube 5 is controlled at 500 l/min, reduces the air concentration in the stove.
3, in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to 201rpm, makes the furnace gas pressure-fired in the LF stove, avoid the temperature-rise period Air to be drawn in the LF stove by the slit between bell 4 and the ladle.
Simultaneously, add in three batches in the molten steel and contain CaCO
3Mass percent is 10% foaming lime, and every batch adds 280 kg, by CaCO in the foaming lime
3The effect of reducing foaming, form good foamy slag, thereby improve the submerged arc effect, reduce the contact probability of electric arc and air.In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution 670 rpm, use lime as sludging flux.
After implementing as stated above, the initial nitrogen content mass percent of LF stove is 0.0031%, and finishing the nitrogen content mass percent is 0.0037%.
Claims (2)
1. method that reduces the nitrogen pick-up of ladle refining furnace molten steel heating is characterized in that:
(1), be that the center of LF stove three root graphite electrodes processes respectively an argon gas hole at ladle refining furnace, the argon gas hole is by hose connection argon gas pipeline; When the LF stove is processed molten steel, in stove, be blown into argon gas by Graphite Electrodes argon gas hole, the argon gas supply gas pressure is controlled at 0.4-0.8MPa, and the argon flow amount in each argon gas hole is controlled at 20-200 l/min;
(2), under LF stove bell, along circumference the argon gas endless tube is installed, be evenly equipped with 10-50 argon blowing hole on the argon gas endless tube, the argon blowing hole opening direction is towards the gap of bell and ladle, and the argon gas endless tube is connected with the argon gas pipeline by air induction hose; When the LF stove was processed molten steel, the argon blowing hole below bell on the argon gas endless tube carried out Argon, and argon pressure is controlled at 0.4-0.8MPa, and the Argon amount of whole argon gas endless tube is controlled at 250-500 l/min;
(3), in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to the 30-70% of maximum speed of revolution, make the furnace gas pressure-fired in the LF stove; And in molten steel, divide a 1-3 to criticize adding foaming lime, every batch of add-on is that steel per ton adds 1-3kg; In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution, use lime as sludging flux.
2. the method for minimizing ladle refining furnace molten steel heating according to claim 1 nitrogen pick-up is characterized in that, CaCO in the described foaming lime
3Mass percentage content is 10-20%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103612528A CN102899456A (en) | 2012-09-25 | 2012-09-25 | Method for reducing nitrogen increase of molten steel in refined-smelting ladle furnace (LF) in heating process |
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| CN2012103612528A CN102899456A (en) | 2012-09-25 | 2012-09-25 | Method for reducing nitrogen increase of molten steel in refined-smelting ladle furnace (LF) in heating process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107164610A (en) * | 2017-06-07 | 2017-09-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel increasing method for nitrogen |
| CN115717180A (en) * | 2022-11-01 | 2023-02-28 | 山东钢铁股份有限公司 | Method for reducing nitrogen increase of molten steel in LF refining process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0177908A1 (en) * | 1984-10-12 | 1986-04-16 | Nippon Kokan Kabushiki Kaisha | Arc-heating type extra-furnace refining apparatus |
| US4650517A (en) * | 1985-05-29 | 1987-03-17 | Nippon Kokan Kabushiki Kaisha | Method of heating molten steel by arc process |
| CN1218900A (en) * | 1997-11-28 | 1999-06-09 | 北京兰斯节能技术开发中心 | Direct current steel ladle refiner |
| CN2550708Y (en) * | 2002-06-25 | 2003-05-14 | 罗廷和 | AC plasma steel ladle refining furnace |
| CN102031338A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Method for nitriding molten steel stably |
| CN102260770A (en) * | 2010-05-26 | 2011-11-30 | 上海梅山钢铁股份有限公司 | Slag material for refinery furnace |
| CN102296160A (en) * | 2011-08-16 | 2011-12-28 | 秦皇岛首秦金属材料有限公司 | Low-cost RH molten steel nitrogen increasing and controlling process |
| CN202415609U (en) * | 2011-12-20 | 2012-09-05 | 鞍钢股份有限公司 | Furnace cover argon-seal device for ladle refining furnace |
-
2012
- 2012-09-25 CN CN2012103612528A patent/CN102899456A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0177908A1 (en) * | 1984-10-12 | 1986-04-16 | Nippon Kokan Kabushiki Kaisha | Arc-heating type extra-furnace refining apparatus |
| US4650517A (en) * | 1985-05-29 | 1987-03-17 | Nippon Kokan Kabushiki Kaisha | Method of heating molten steel by arc process |
| CN1218900A (en) * | 1997-11-28 | 1999-06-09 | 北京兰斯节能技术开发中心 | Direct current steel ladle refiner |
| CN2550708Y (en) * | 2002-06-25 | 2003-05-14 | 罗廷和 | AC plasma steel ladle refining furnace |
| CN102031338A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Method for nitriding molten steel stably |
| CN102260770A (en) * | 2010-05-26 | 2011-11-30 | 上海梅山钢铁股份有限公司 | Slag material for refinery furnace |
| CN102296160A (en) * | 2011-08-16 | 2011-12-28 | 秦皇岛首秦金属材料有限公司 | Low-cost RH molten steel nitrogen increasing and controlling process |
| CN202415609U (en) * | 2011-12-20 | 2012-09-05 | 鞍钢股份有限公司 | Furnace cover argon-seal device for ladle refining furnace |
Non-Patent Citations (1)
| Title |
|---|
| 李玮等: "降低LF炉精炼过程钢水增氮量的生产实践", 《冶金丛刊》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107164610A (en) * | 2017-06-07 | 2017-09-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel increasing method for nitrogen |
| CN115717180A (en) * | 2022-11-01 | 2023-02-28 | 山东钢铁股份有限公司 | Method for reducing nitrogen increase of molten steel in LF refining process |
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Application publication date: 20130130 |