CN102145380B - Method for continuously casting clean molten steel in tundish - Google Patents
Method for continuously casting clean molten steel in tundish Download PDFInfo
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- CN102145380B CN102145380B CN2011100557401A CN201110055740A CN102145380B CN 102145380 B CN102145380 B CN 102145380B CN 2011100557401 A CN2011100557401 A CN 2011100557401A CN 201110055740 A CN201110055740 A CN 201110055740A CN 102145380 B CN102145380 B CN 102145380B
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- tundish
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Abstract
The invention relates to a method for continuously casting clean molten steel in a tundish. The technical scheme adopted by the invention is as follow: 1-4 air bricks (4) are arranged at the bottom (2) of a tundish (1), 1-4 ultrasonic generators (3) are arranged at one side outside the tundish (1), each ultrasonic generator (3) is arranged on an extended line of a corresponding air brick (4), the distance between each ultrasonic generator (3) and an end face of the corresponding air brick (4) at the same side is 500-1200mm; before the tundish is poured, argon is firstly introduced in by virtue of the air bricks (4), wherein the argon blowing flow is 10-50Nl/min, and the pressure is 0.10-0.20MPa; and when the tundish is poured, the ultrasonic generators (3) are started, the argon blowing flow is 20-120Nl/min, and the pressure is 0.15-0.30MPa. The method provided by the invention is beneficial to degassing and removing massive small nonmetallic inclusions, the inclusion content in the molten steel can be reduced to a low-down level, the molten steel contains no slag entrainment, and the temperature is uniform and stable; meanwhile, the method has the advantages of less investment, light equipment, simpleness of operation, stable steel grade quality and the like.
Description
Technical field
The invention belongs to the steel-making continuous casting technical field.Be specifically related to a kind of method of continuous casting tundish clean molten steel.
Background technology
High-quality clean steel is meant and is mingled with the processing characteristics that is reduced to product, the steel that serviceability has no adverse effects in the steel.Along with the development of national defence, traffic, energy industry, its demand is constantly increasing in recent years, becomes the important directions of new century world's steel-smelting technology development, and developed country falls over each other to have the clean steel with strategic position and smelts cutting edge technology.
The cleanliness factor that improves molten steel is the basis of improving steel product quality, steel performance is had removing of impurity such as [O], [H], [N] and non-metallic inclusion in the steel of big negative effect, becomes an important step of producing the high-quality steel grade in the steel making working procedure.Therefore, the smelting level of converter-double refining-each link of continuous casting has important practical significance in improvement and the lifting steelmaking process.
Development along with continuous casting technology; The continuous casting tundish is controlled the final opportunity that is mingled with in the steel before becoming a useful person as molten steel; People have worked out various tundish metallurgy technology; As change the structure of tundish, and control stream means such as various barricades, turbulence inhibitor, high calcium filter are set in tundish, promoted the come-up of big (greater than 50 μ m) non-metallic inclusion in the molten steel effectively.In recent years, scientific and technical personnel have also developed tundish Argon technology, but are confined to produce bubble size and distribution, and are still lower less than the tiny non-metallic inclusion elimination factor of 50 μ m, and can cause molten steel temperature to descend, and energy consumption is big, production efficiency is low.
At present, the high-quality steel product has very harsh requirement to the oxide inclusions particle size, is that the DI jar of 0.2～0.3mm use carbon aluminium-killed steel like thickness, cracks when preventing to dash jar, requires the steel inclusion particle size less than 40 μ m; The engine valve spring steel then requires the field trash size less than 15 μ m; And thickness has only the picture tube of 0.1～0.2 μ m to use high antimagnetic shadow mask is that the radial of 0.1～0.25mm is used steel wire with steel and diameter as thin as a wafer, requires the field trash diameter less than 5 μ m.But also fail to reach efficiently and stably above-mentioned target at present.
Summary of the invention
The present invention is intended to overcome the prior art defective, and purpose provides a kind of small investment, simple to operate, the method that can efficiently outgas and get rid of in a large number the continuous casting tundish clean molten steel of tiny non-metallic inclusion.
For realizing above-mentioned purpose; Technical scheme of the present invention is: be provided with 1～4 air brick in the bottom of tundish; Side outside tundish is provided with 1～4 supersonic generator accordingly; Each supersonic generator lays respectively on the extended line of each self-corresponding air brick, and the end face distance of each supersonic generator and each self-corresponding air brick homonymy one end is 500～1200mm.
Before the centre was unwrapped and watered, through air brick Argon (feeding argon gas), argon blowing rate was 10～50Nl/min earlier, and Argon pressure is 0.10～0.20MPa; Unwrap when watering the centre, opens supersonic generator again, and argon blowing rate is 20～120Nl/min, and Argon pressure is 0.15～0.30MPa.
In technique scheme: air brick is a kind of in diffuse type air brick, straight-through slot-type ventilating brick, straight-through cellular type air brick, the combined type air brick: the ultrasonic frequency of supersonic generator 3 outputs is 20～80KHz.
Because adopt technique scheme, the invention has the advantages that: the side outside tundish is provided with several supersonic generators, need not increase miscellaneous equipment, so small investment and simple to operate; And, will above air brick, form the ultrasonic wave zone of action because each supersonic generator is positioned on the extended line of each self-corresponding air brick.When in molten steel, being blown into a large amount of inert gas through air brick; Gas can produce great amount of bubbles after getting into molten steel; When bubble is in the ultrasonic wave zone of action, a big velocity of wave motion gradient is arranged on the bubble, the shearing force that is produced by its can smash into 0.5～1mm's even littler micro-bubble with bubble; And, can more efficiently adsorb and get rid of 40 μ m even small field trash below the 10 μ m because action of ultrasonic waves causes the gas-liquid interface foldization of micro-bubble and molten steel; The ultrasonic cavitation interaction energy removes the foreign gas in the molten steel; Especially can remove [H] bigger to the performance impact of steel; It is separated out the formation micro-bubble and makes the inclusion particle come-up; Also help the inclusion particle collision and grow up and the removal of floating, the energy that discharges with ultrasonic wave in the gas at normal temperature ability that is blown into simultaneously, the molten steel cooling that this has also been avoided blowing and has brought.
Therefore, the present invention is used for the tundish clean steel and smelts, and helps the degassing and the small non-metallic inclusion of a large amount of eliminatings, can being mingled with in the molten steel be reduced to low-down level, and molten steel does not have the volume slag, temperature is uniform and stable; Simultaneously, also have advantages such as small investment, equipment are light, simple to operate, steel grade steady quality.
Description of drawings
Fig. 1 adopts a kind of structural representation of a supersonic generator (3) for the present invention;
Fig. 2 adopts a kind of structural representation of two supersonic generators (3) for the present invention;
Fig. 3 adopts a kind of structural representation of three supersonic generators (3) for the present invention;
Fig. 4 adopts a kind of structural representation of four supersonic generators (3) for the present invention.
The specific embodiment
Below in conjunction with the specific embodiment and accompanying drawing the present invention being done further description, is not the restriction to protection domain:
A kind of method of continuous casting tundish clean molten steel.As shown in Figure 1; Bottom (2) in tundish (1) is provided with 1 air brick (4); Side outside tundish (1) is provided with 1 supersonic generator (3); Supersonic generator (3) is positioned on the extended line of air brick (4), and supersonic generator (3) is 500～700mm with the end face distance of air brick (4) homonymy one end.
Before tundish (1) is opened and watered, feed argon gas (being Argon) through air brick (4) earlier, argon blowing rate is 10～30Nl/min, and Argon pressure is 0.17～0.20MPa; Tundish (1) is opened when watering, and opens supersonic generator (3) again, and argon blowing rate is 20～60Nl/min, and Argon pressure is 0.20～0.26MPa.
Among the embodiment 1: air brick (4) is the diffuse type air brick; The ultrasonic frequency of supersonic generator (3) output is 20～35KHz.
A kind of method of continuous casting tundish clean molten steel.As shown in Figure 2; Bottom (2) in tundish (1) is provided with 2 air bricks (4); Side outside tundish (1) is provided with 2 supersonic generators (3) accordingly; 2 supersonic generators (3) lay respectively on the extended line of each self-corresponding air brick (4), and 2 supersonic generators (3) are 700～900mm with the end face distance of each self-corresponding air brick (4) homonymy one end;
Before tundish (1) is opened and watered, feed argon gas (being Argon) through air brick (4) earlier, argon blowing rate is 20～40Nl/min, and Argon pressure is 0.14～0.17MPa; Tundish (1) is opened when watering, and opens supersonic generator (3) again, and argon blowing rate is 40～80Nl/min, and Argon pressure is 0.18～0.23MPa.
Among the embodiment 2: air brick (4) is straight-through slot-type ventilating brick; The ultrasonic frequency of supersonic generator (3) output is 35～50KHz.
A kind of method of continuous casting tundish clean molten steel.As shown in Figure 3; Bottom (2) in tundish (1) is provided with 3 air bricks (4); Side outside tundish (1) is provided with 3 supersonic generators (3) accordingly; 3 supersonic generators (3) lay respectively on the extended line of each self-corresponding air brick (4), and 3 supersonic generators (3) are 900～1100mm with the end face distance of each self-corresponding air brick (4) homonymy one end;
Before tundish (1) is opened and watered, feed argon gas (being Argon) through air brick (4) earlier, argon blowing rate is 30～50Nl/min, and Argon pressure is 0.10～0.15MPa; Tundish (1) is opened when watering, and opens supersonic generator (3) again, and argon blowing rate is 60～100Nl/min, and pressure is 0.15～0.19MPa.
Among the embodiment 3: air brick (4) is straight-through cellular type air brick; The ultrasonic frequency of supersonic generator (3) output is 50～65KHz.
Embodiment 4
A kind of method of continuous casting tundish clean molten steel.As shown in Figure 4; Bottom (2) in tundish (1) is provided with 4 air bricks (4); Side outside tundish (1) is provided with 4 supersonic generators (3) accordingly; 4 supersonic generators (3) lay respectively on the extended line of each self-corresponding air brick (4), and 4 supersonic generators (3) are 1000～1200mm with the end face distance of each self-corresponding air brick (4) homonymy one end;
Before tundish (1) is opened and watered, feed argon gas (being Argon) through air brick (4) earlier, argon blowing rate is 20～40Nl/min, and Argon pressure is 0.12～0.15MPa; Tundish (1) is opened when watering, and opens supersonic generator (3) again, and argon blowing rate is 80～120Nl/min, and pressure is 0.24～0.30MPa.
Among the embodiment 4: air brick (4) is the combined type air brick; The ultrasonic frequency of supersonic generator (3) output is 65～80KHz.
The side of this specific embodiment outside tundish (1) is provided with 1～4 supersonic generator (3), need not increase miscellaneous equipment, so small investment and simple to operate; And, will form the ultrasonic wave zone of action in the top of air brick (4) because each supersonic generator (3) lays respectively on the extended line of each self-corresponding air brick (4).When in molten steel, being blown into a large amount of inert argon through air brick (4); Gas can produce great amount of bubbles after getting into molten steel; When bubble is in the ultrasonic wave zone of action, a big velocity of wave motion gradient is arranged on the bubble, the shearing force that is produced by its can smash into 0.5～1mm's even littler micro-bubble with bubble; And, can more efficiently adsorb and get rid of 40 μ m even small field trash below the 10 μ m because action of ultrasonic waves causes the gas-liquid interface foldization of micro-bubble and molten steel; The ultrasonic cavitation interaction energy removes the foreign gas in the molten steel; Especially can remove [H] bigger to the performance impact of steel; It is separated out the formation micro-bubble and makes the inclusion particle come-up; Also help the inclusion particle collision and grow up and the removal of floating, the energy that discharges with ultrasonic wave in the gas at normal temperature ability that is blown into simultaneously, the molten steel cooling that this has also been avoided blowing and has brought.
Therefore, the present invention is used for the tundish clean steel and smelts, and helps the degassing and the small non-metallic inclusion of a large amount of eliminatings, can being mingled with in the molten steel be reduced to low-down level, and molten steel does not have the volume slag, temperature is uniform and stable; Simultaneously, also have advantages such as small investment, equipment are light, simple to operate, steel grade steady quality.
Claims (3)
1. the method for a continuous casting tundish clean molten steel; It is characterized in that being provided with 1～4 air brick (4) in the bottom (2) of tundish (1); Side outside tundish (1) is provided with 1～4 supersonic generator (3) accordingly; Each supersonic generator (3) lays respectively on the extended line of each self-corresponding air brick (4), and each supersonic generator (3) is 500～1200mm with the end face distance of each self-corresponding air brick (4) homonymy one end;
Before tundish (1) is opened and watered, feed argon gas through air brick (4) earlier, argon blowing rate is 10～50Nl/min, and Argon pressure is 0.10～0.20MPa; Tundish (1) is opened when watering, and opens supersonic generator (3) again, and argon blowing rate is 20～120Nl/min, and Argon pressure is 0.15～0.30MPa.
2. the method for continuous casting tundish clean molten steel according to claim 1 is characterized in that a kind of in diffuse type air brick, straight-through slot-type ventilating brick, straight-through cellular type air brick, the combined type air brick of described air brick (4).
3. the method for continuous casting tundish clean molten steel according to claim 1 is characterized in that the ultrasonic frequency of described supersonic generator (3) output is 20～80KHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100557401A CN102145380B (en) | 2011-03-08 | 2011-03-08 | Method for continuously casting clean molten steel in tundish |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018207196A1 (en) * | 2017-05-12 | 2018-11-15 | Shah Chirag Satish | An automated device for degassing and/or foaming of metals and their alloys and process thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102642004A (en) * | 2012-05-22 | 2012-08-22 | 武汉科技大学 | Method of cleaning molten steel with multi-foam screen of continuously casted tundish |
| CN102994701A (en) * | 2012-11-30 | 2013-03-27 | 鞍钢股份有限公司 | Method for refining argon bubble size in refining process |
| CN105057606B (en) * | 2013-06-07 | 2017-07-14 | 马鞍山华盛冶金科技发展有限公司 | A kind of method for improving Cleanliness of Molten Steel and crystal grain thinning |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SU571519A1 (en) * | 1972-11-30 | 1977-09-05 | Ждановский Филиал Украинского Государственного Института По Проектированию Металлургических Заводов | Method of processing metal melt |
| CN101121199A (en) * | 2007-09-12 | 2008-02-13 | 北京科技大学 | Method for removing non-metallic inclusions from continuous casting tundish air curtain |
| CN101307374A (en) * | 2007-05-15 | 2008-11-19 | 宝山钢铁股份有限公司 | Process for removing nonmetal inclusion in molten steel |
| CN101775538A (en) * | 2010-03-24 | 2010-07-14 | 中南大学 | Technique for producing 500MPa level high-strength quake-proof reinforcing steel bar |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04341511A (en) * | 1991-05-20 | 1992-11-27 | Nkk Corp | Device for stirring molten iron |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU571519A1 (en) * | 1972-11-30 | 1977-09-05 | Ждановский Филиал Украинского Государственного Института По Проектированию Металлургических Заводов | Method of processing metal melt |
| CN101307374A (en) * | 2007-05-15 | 2008-11-19 | 宝山钢铁股份有限公司 | Process for removing nonmetal inclusion in molten steel |
| CN101121199A (en) * | 2007-09-12 | 2008-02-13 | 北京科技大学 | Method for removing non-metallic inclusions from continuous casting tundish air curtain |
| CN101775538A (en) * | 2010-03-24 | 2010-07-14 | 中南大学 | Technique for producing 500MPa level high-strength quake-proof reinforcing steel bar |
Non-Patent Citations (1)
| Title |
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| JP特开平4-341511A 1992.11.27 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018207196A1 (en) * | 2017-05-12 | 2018-11-15 | Shah Chirag Satish | An automated device for degassing and/or foaming of metals and their alloys and process thereof |
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