CN102864283A - Argon-blowing long nozzle for clean steel - Google Patents
Argon-blowing long nozzle for clean steel Download PDFInfo
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- CN102864283A CN102864283A CN2012103485611A CN201210348561A CN102864283A CN 102864283 A CN102864283 A CN 102864283A CN 2012103485611 A CN2012103485611 A CN 2012103485611A CN 201210348561 A CN201210348561 A CN 201210348561A CN 102864283 A CN102864283 A CN 102864283A
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Abstract
The invention relates to an argon-blowing long nozzle for clean steel, of which the outer wall is provided with an argon-blowing guide tube. The invention is characterized in that an annular gas chamber communicated with the argon-blowing guide tube is arranged between the inner side wall and the outer side wall of the long nozzle; the annular gas chamber extends in the radial direction of the inner side wall of the nozzle; and the inner side wall of the nozzle is also provided with a plurality of vent holes which communicate the inside of the nozzle with the annular gas chamber. According to the invention, argon is blown into the gas chamber through the argon-blowing connecting tube, and blown into the molten steel through the vent holes in the gas chamber; the inner wall of the nozzle can generate more small bubbles; and meanwhile, shearing force generated by the gradient of flow velocity of the molten steel can smash the small bubbles into smaller bubbles. The increasing number of bubbles can greatly enhance the inclusion removal efficiency. The inclusions entrapped by the small bubbles quickly float up after entering the tundish, and are adsorbed by the tundish covering agent, thereby enhancing the cleanliness of the casting blank.
Description
Technical field
The present invention relates to a kind of argon blowing long nozzle for Clean Steel production, belong to the steel-making continuous casting equipment technical field.
Background technology
Along with socioeconomic development, the performance requriements of steel is improved day by day, how effectively to prevent and removal of inclusions to greatest extent, the cleanliness factor that improves steel is present research work and industrial theme.Therefore, people improve the inclusion removal technology constantly for a long time, explore new inclusion removal method.
Inclusion major part in the steel is by the buoyancy removal of naturally floating, but only depends on nature floating efficient very low, can't satisfy production requirement, therefore needs to adopt special means to strengthen the removal of inclusion.Technical way has at present: gas stirring, electromagnetic purification filters etc.
Wherein, gas stirring is simple effective method, usually adopt the method at ladle or tundish argon bottom-blowing, by jet enter, bubble formation, bubble disperse and the process such as floating, and a series of Physical Chemistry of Metallurgy processes such as the Circulating Flow of Molten Steel that causes thus, interfacial mass transfer and reaction, slag gold interface volume are mixed, inclusion eliminating.
The theoretical analysis of catching inclusion particle by bubble as can be known, the efficient that steel inclusion is captured removal by bubble is decided by to be blown into number of bubbles and bubble size in the molten steel.As the gas supply element of bottom argon blowing technology, Argon is generally 2-4mm with the gas permeable brick mean pore size, and the bubble diameter that produces in argon blowing rate scope commonly used is 10-20mm.And effectively the optimum gas bulb diameter of removal of inclusions is 2-15mm, and bubble floating-upward process in molten steel can expand rapidly.Therefore, it is very little that the bubble that BOTTOM ARGON BLOWING produces is caught small-particle inclusion probability, undesirable to the fine foreign matter removal effect.Therefore, need to produce morely in tundish, the bubble that size is less is to improve the captive probability of inclusion.
Argon gas is incorporated in the molten steel of enough turbulence intensities, the shearing force that relies on the turbulent fluctuation velocity slope to produce smashes bubble, air pocket can be smashed into small bubbles.In the whole flow process, only have the long nozzle between ladle and the tundish just to have so high turbulence intensity from the liquid steel refining to the continuous casting, introducing gas from long nozzle is more satisfactory position.
And ladle long nozzle mainly is that molten steel and air from the ladle to the tundish are separated at present, prevents new being mingled with that secondary oxidation produces in casting process.Be used for the continuous casting protection steel casting ladle long nozzle such as Chinese utility model patent 200520105644.3, mainly be by at the long nozzle inwall ventilative wear ring is set, outer wall arranges gas blow pipe, gas blow pipe arrives ventilative wear ring by the air cleft that forms between long nozzle body upper end and outer ring surface and the box hat; When being blown into gas by blowing afloat pipe in the sealing steel shell, the refractory fibre of internal gas by ventilative sealing-ring blows out that to arrive long nozzle inner, makes the inner malleation that forms in the mouth of a river, and the molten steel process air amount that prevents from casting causes secondary oxidation of steel.The main purpose of this technology is to prevent that by seal washer and Ar hermetic seal Air infitration from causing secondary oxidation of steel, argon gas penetrates into inside, the mouth of a river by sealing-ring, play sealing function, improving cleanliness factor although can prevent the molten steel secondary oxidation, is not to catch inclusion particle by bubble to improve cleanliness factor yet.
201120051787.6 1 kinds of long steel ladle nozzle for cleaning molten steels of Chinese utility model patent mainly are that the air blowing conduit is set above the slag line of long nozzle body, are blown into argon gas by the air blowing conduit in molten steel, and then improve molten steel cleanness.But it only has an air blowing conduit, and diameter 5-10mm only, and air-blowing quantity is less than normal, and number of bubbles is few, can not guarantee to be evenly distributed, and the inclusion removal effect is difficult to guarantee.The conduit of blowing simultaneously is positioned at the slag line top of long nozzle body, and blow-out position is near apart from pouring basket liquid level, and the gas that is blown into does not have the sufficient time to be broken into tiny bubble by the velocity shock of molten steel, so the fine foreign matter removal is difficult to reach ideal effect.
Therefore, be necessary the novel long nozzle of development and Design, promote the cleaning action of long nozzle, promote the removal of inclusion, further improve the strand degree of cleaning.
Summary of the invention
The technical problem to be solved in the present invention is: propose a kind of Clean Steel argon blowing long nozzle, can more effectively remove steel inclusion, further improve the strand degree of cleaning.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of Clean Steel argon blowing long nozzle is arranged on the junction of ladle and tundish, and the upper end of mouth of a river body is that step-like funnel, lower end are right cylinder; The Argon conduit is set on the outer wall of the mouth of a river; It is characterized in that: argon gas access point horizontally disposed gas hole place between the outer side wall in the pars infundibularis of long nozzle or cylindrical portion, the gas hole of long nozzle directly connects the Argon conduit, and argon gas directly is blown into molten steel by the Argon conduit through the gas hole of long nozzle.
By technique scheme, be horizontally disposed with the gas hole of long nozzle toward in from the cylindrical portion outer side wall of long nozzle, the gas hole of long nozzle directly connects the Argon conduit; The gas hole level of long nozzle is communicated with a ring-shaped air chamber toward interior; Ring-shaped air chamber also offers the breather hole of inside, a plurality of connections mouth of a river and ring-shaped air chamber toward interior radially bearing of trend on the inner side-wall of the mouth of a river; Argon gas directly is blown into molten steel by the Argon conduit through gas hole, air chamber, the breather hole of long nozzle.
By technique scheme, described breather hole arranges many rows along mouth of a river axial direction due, and every row arranges a plurality of breather holes along the even interval of mouth of a river circumferential direction.
By technique scheme, the ring-shaped air chamber axial length is no more than 1/2nd of long nozzle body.
By technique scheme, every row is along at least 4 breather holes of mouth of a river circumferential direction setting.
By technique scheme, during casting, this long nozzle is arranged between ladle and the tundish, be blown into argon gas by the Argon conduit to molten steel, argon gas externally enters air chamber under the pressure, and is blown into by breather hole in the molten steel of inside, the mouth of a river; Argon gas produces the small bubbles of One's name is legion at mouth of a river inwall, molten steel smashes into more tiny bubble toward the shearing force of the velocity slope generation of current downflow with small bubbles simultaneously; More tiny bubble and the small bubbles that do not smash are captured and are entered tundish and rapid floating in the molten steel behind the inclusion particle, are adsorbed by tundish covering flux, improve the degree of cleaning of strand.
By technique scheme, argon blowing rate is 5-50L/min, and Argon pressure is 0.1-2Mpa.
Use the present invention, by the junction at ladle and tundish, argon gas is incorporated in the molten steel, the small bubbles that enter the argon gas of inside, the mouth of a river are captured the inclusion in the molten steel, because bubble constantly smashes and produces more tiny bubble, more the tiny bubble probability of catching inclusion is higher than small bubbles, and, the more efficient that also can greatly improve removal of inclusions of number of bubbles.Like this, when all bubbles capture inclusion enter tundish after rapid floating, after being adsorbed by tundish covering flux, just can significantly improve the degree of cleaning of strand.Catch small-particle with respect to the bubble of BOTTOM ARGON BLOWING generation and be mingled with, ideal to the fine foreign matter removal effect.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the invention;
Fig. 2 is the A-A view of Fig. 1;
Among Fig. 1-2: 1, long nozzle; 2 air chambers; 3, Argon conduit; 4, breather hole.
Fig. 3 is the structural representation of another embodiment of the present invention;
Among Fig. 3,1, long nozzle, 2 gas holes, 3 Argon conduits.
Embodiment
The invention will be further described below in conjunction with embodiment, but do not limit the present invention.
As illustrated in fig. 1 and 2, according to Clean Steel of the invention process argon blowing long nozzle 1, the upper end of mouth of a river body is that step-like funnel, lower end are cylindric; Argon conduit 3 is set on the outer wall of the mouth of a river; Between long nozzle inner side-wall and outer side wall, a ring-shaped air chamber 2 that is communicated with Argon conduit 3 is set; Ring-shaped air chamber 2 also offers the breather hole 4 of inside, a plurality of connections mouth of a river and ring-shaped air chamber toward the radially bearing of trend of mouth of a river inner side-wall on the inner side-wall of the mouth of a river.
By technique scheme, described breather hole 4 arranges many rows along mouth of a river axial direction due, and every row arranges a plurality of breather holes 4 along circumferential direction interval, the mouth of a river.
By technique scheme, Argon conduit 3 is arranged on the cylindric cylinder in step-like funnel below of long nozzle, certainly, also can above-mentioned air chamber 2, Argon conduit 3, breather hole 4 be set in mouth of a river funnel part; In any case ring-shaped air chamber 2 axial lengths are no more than 1/2nd of mouth of a river body.
By technique scheme, every row is along at least 4 breather holes of mouth of a river circumferential direction setting 4; Among Fig. 1 and 2, inside, the mouth of a river is provided with 4 row's breather holes and is communicated with air chamber, and every row is by 90 ° of angular distribution 4 breather holes 4.
In producing the soft steel casting process, be blown into argon gas from ladle long nozzle 1, argon gas is blown into air chamber 2 by taking over 3 by Argon, and argon gas is under certain pressure, enter air chamber 2 by Argon conduit 3, argon gas is blown into a large amount of small bubbles of formation in the molten steel by each breather hole 4 in air chamber.The shearing force that the velocity slope of simultaneously molten steel generation produces smashes bubble, and small bubbles are smashed into more tiny bubble, and number of bubbles is more, and bubble size is less, and the captive probability of inclusion is larger, further improves the strand degree of cleaning.
Inside, the mouth of a river is provided with 3 row's breather holes and is communicated with air chamber as different from Example 1, and every row presses 60 ° of angular distribution 6 breather holes 4.
Embodiment 3: a kind of Clean Steel is arranged on the junction of ladle and tundish with argon blowing long nozzle 1, and the upper end of mouth of a river body is that step-like funnel, lower end are right cylinder; Argon conduit 3 is set on the outer wall of the mouth of a river; It is characterized in that: the argon gas access point is positioned at horizontally disposed gas hole 2 places between the pars infundibularis (such as Fig. 3) of long nozzle or the cylindrical portion outer side wall, the gas hole 2 of long nozzle directly connects Argon conduit 3, and argon gas directly is blown into molten steel by Argon conduit 3 through the gas hole 2 of long nozzle.
Claims (7)
1. Clean Steel argon blowing long nozzle is arranged on the junction of ladle and tundish, and the upper end of mouth of a river body is that step-like funnel, lower end are right cylinder; The Argon conduit is set on the outer wall of the mouth of a river; It is characterized in that: argon gas access point horizontally disposed gas hole place between the outer side wall in the pars infundibularis of long nozzle or cylindrical portion, the gas hole of long nozzle directly connects the Argon conduit, and argon gas directly is blown into molten steel by the Argon conduit through the gas hole of long nozzle.
2. long nozzle according to claim 1, it is characterized in that: be horizontally disposed with the gas hole of long nozzle toward in from the cylindrical portion outer side wall of long nozzle, the gas hole of long nozzle directly connects the Argon conduit; The gas hole level of long nozzle is communicated with a ring-shaped air chamber toward interior; Ring-shaped air chamber also offers the breather hole of inside, a plurality of connections mouth of a river and ring-shaped air chamber toward interior radially bearing of trend on the inner side-wall of the mouth of a river; Argon gas directly is blown into molten steel by the Argon conduit through gas hole, air chamber, the breather hole of long nozzle.
3. long nozzle according to claim 2 is characterized in that: described breather hole arranges many rows along mouth of a river axial direction due, and every row arranges a plurality of breather holes along the even interval of mouth of a river circumferential direction.
4. according to claim 2 or 3 described long nozzles, it is characterized in that: the ring-shaped air chamber axial length is no more than 1/2nd of long nozzle body.
5. long nozzle according to claim 4, it is characterized in that: every row is along at least 4 breather holes of mouth of a river circumferential direction setting.
6. one of according to claim 1-3 or 5 described long nozzles, it is characterized in that: during casting, this long nozzle is arranged between ladle and the tundish, is blown into argon gas by the Argon conduit to molten steel, argon gas externally enters air chamber under the pressure, and is blown into by breather hole in the molten steel of inside, the mouth of a river; Argon gas produces the small bubbles of One's name is legion at mouth of a river inwall, molten steel smashes into more tiny bubble toward the shearing force of the velocity slope generation of current downflow with small bubbles simultaneously; More tiny bubble and the small bubbles that do not smash are captured and are entered tundish and rapid floating in the molten steel behind the inclusion particle, are adsorbed by tundish covering flux, improve the degree of cleaning of strand.
7. long nozzle according to claim 6, it is characterized in that: argon blowing rate is 5-50L/min, Argon pressure is 0.1-2Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012103485611A CN102864283A (en) | 2012-09-19 | 2012-09-19 | Argon-blowing long nozzle for clean steel |
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| CN2012103485611A CN102864283A (en) | 2012-09-19 | 2012-09-19 | Argon-blowing long nozzle for clean steel |
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| CN2012103485611A Pending CN102864283A (en) | 2012-09-19 | 2012-09-19 | Argon-blowing long nozzle for clean steel |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028739A (en) * | 2014-06-18 | 2014-09-10 | 莱芜钢铁集团有限公司 | Ladle gas-permeable upper nozzle pocket block and nozzle slag entrapment control method implemented by same |
| CN104525929A (en) * | 2014-12-18 | 2015-04-22 | 东北大学 | Method for controlling steel ladle tapping slag by blowing argon gas to annular steel outlet in bottom of steel ladle |
| CN104139179B (en) * | 2014-06-05 | 2016-04-06 | 中冶连铸技术工程有限责任公司 | A kind of multi-functional argon blowing long nozzle |
| CN107755679A (en) * | 2017-12-07 | 2018-03-06 | 安徽工业大学 | The long nozzle device and argon jetting method of a kind of argon blowing seal and purifying of steel |
| CN107983943A (en) * | 2017-12-07 | 2018-05-04 | 安徽工业大学 | A kind of system and method for improving tundish Cleanliness of Molten Steel under unstable state state |
| CN108526454A (en) * | 2018-06-04 | 2018-09-14 | 河钢股份有限公司 | A kind of curved surface sealing two-way argon blowing long nozzle structure |
| CN109396365A (en) * | 2018-12-29 | 2019-03-01 | 东北大学 | Casting device under a kind of new eddy flow |
| CN109482825A (en) * | 2018-12-29 | 2019-03-19 | 东北大学 | A kind of lower casting device |
| CN109570484A (en) * | 2019-01-24 | 2019-04-05 | 北京利尔高温材料股份有限公司 | A kind of ventilative submersed nozzle of bottom blowing |
| CN110227814A (en) * | 2019-07-16 | 2019-09-13 | 航大(厦门)新材科技有限公司 | A kind of rotary and centrifugal filtering tundish for clean steel continuous casting and rolling production |
| CN111715874A (en) * | 2020-06-18 | 2020-09-29 | 河北工业职业技术学院 | Filter type continuous casting long nozzle |
| CN112247136A (en) * | 2020-09-30 | 2021-01-22 | 东北大学 | Tundish short-distance jet flow long nozzle structure and argon blowing smelting method |
| CN114042906A (en) * | 2021-11-15 | 2022-02-15 | 攀钢集团研究院有限公司 | Submerged nozzle and method for improving heavy rail non-metallic inclusion control |
| CN114054739A (en) * | 2021-11-15 | 2022-02-18 | 攀钢集团研究院有限公司 | Submerged nozzle for promoting high efficiency and high cleanness and continuous casting production method |
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| CN201320605Y (en) * | 2008-04-17 | 2009-10-07 | 首钢总公司 | Long water gap combined argon blowing airproof device for continuous casting |
| CN102019387A (en) * | 2009-09-15 | 2011-04-20 | 鞍钢股份有限公司 | Method for removing fine inclusions in molten steel |
| JP2011131238A (en) * | 2009-12-24 | 2011-07-07 | Tokyo Yogyo Co Ltd | Long nozzle |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104139179B (en) * | 2014-06-05 | 2016-04-06 | 中冶连铸技术工程有限责任公司 | A kind of multi-functional argon blowing long nozzle |
| CN104028739B (en) * | 2014-06-18 | 2016-09-21 | 莱芜钢铁集团有限公司 | A kind of ladle ventilating filling pipe end brick cup and the method controlling mouth of a river slag thereof |
| CN104028739A (en) * | 2014-06-18 | 2014-09-10 | 莱芜钢铁集团有限公司 | Ladle gas-permeable upper nozzle pocket block and nozzle slag entrapment control method implemented by same |
| CN104525929A (en) * | 2014-12-18 | 2015-04-22 | 东北大学 | Method for controlling steel ladle tapping slag by blowing argon gas to annular steel outlet in bottom of steel ladle |
| CN107983943B (en) * | 2017-12-07 | 2019-07-05 | 安徽工业大学 | A kind of system and method improving tundish Cleanliness of Molten Steel under unstable state state |
| CN107755679A (en) * | 2017-12-07 | 2018-03-06 | 安徽工业大学 | The long nozzle device and argon jetting method of a kind of argon blowing seal and purifying of steel |
| CN107983943A (en) * | 2017-12-07 | 2018-05-04 | 安徽工业大学 | A kind of system and method for improving tundish Cleanliness of Molten Steel under unstable state state |
| CN107755679B (en) * | 2017-12-07 | 2023-09-19 | 安徽工业大学 | Argon blowing sealing and molten steel cleaning long nozzle device and argon blowing method |
| CN108526454A (en) * | 2018-06-04 | 2018-09-14 | 河钢股份有限公司 | A kind of curved surface sealing two-way argon blowing long nozzle structure |
| CN109482825A (en) * | 2018-12-29 | 2019-03-19 | 东北大学 | A kind of lower casting device |
| CN109396365A (en) * | 2018-12-29 | 2019-03-01 | 东北大学 | Casting device under a kind of new eddy flow |
| CN109570484A (en) * | 2019-01-24 | 2019-04-05 | 北京利尔高温材料股份有限公司 | A kind of ventilative submersed nozzle of bottom blowing |
| CN110227814A (en) * | 2019-07-16 | 2019-09-13 | 航大(厦门)新材科技有限公司 | A kind of rotary and centrifugal filtering tundish for clean steel continuous casting and rolling production |
| CN110227814B (en) * | 2019-07-16 | 2024-04-02 | 航大(厦门)新材科技有限公司 | Rotary centrifugal filtering tundish for continuous casting and rolling production of clean steel |
| CN111715874A (en) * | 2020-06-18 | 2020-09-29 | 河北工业职业技术学院 | Filter type continuous casting long nozzle |
| CN112247136A (en) * | 2020-09-30 | 2021-01-22 | 东北大学 | Tundish short-distance jet flow long nozzle structure and argon blowing smelting method |
| CN114042906A (en) * | 2021-11-15 | 2022-02-15 | 攀钢集团研究院有限公司 | Submerged nozzle and method for improving heavy rail non-metallic inclusion control |
| CN114054739A (en) * | 2021-11-15 | 2022-02-18 | 攀钢集团研究院有限公司 | Submerged nozzle for promoting high efficiency and high cleanness and continuous casting production method |
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Application publication date: 20130109 |