CN201644781U - Crystallizer submersed nozzle for preventing continuous cast slab from rolling slag - Google Patents
Crystallizer submersed nozzle for preventing continuous cast slab from rolling slag Download PDFInfo
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- CN201644781U CN201644781U CN2010201586489U CN201020158648U CN201644781U CN 201644781 U CN201644781 U CN 201644781U CN 2010201586489 U CN2010201586489 U CN 2010201586489U CN 201020158648 U CN201020158648 U CN 201020158648U CN 201644781 U CN201644781 U CN 201644781U
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Abstract
The utility model relates to a crystallizer submersed nozzle for preventing a continuous cast slab from rolling slags, which comprises a nozzle body, water outlets and a distributary base, the water outlet is two holes which are bilateral symmetrical, the right lower end of the nozzle is provided with the distributary base, the water outlet is a downward dip angle. The utility model is characterized in that nozzle body (4) is in a reducing structure, the inner aperture of the upper part of the nozzle is phi 60-80mm, the inner diameter of the bottom end of the nozzle is phi 90-100mm, and the downward dip angle alpha of the water outlet (1) is 65-80 degrees. The utility model overcomes the problem that during the continuous cast, the dimension and hole pattern of the crystallizer submersed nozzle are not rational so that the liquid level fluctuation is large and the surface velocity is too high, and effectively prevents the rolling of the protective the slags, reduces the defects of slag rolling and slag inclusion, and the like.
Description
Technical field
The invention belongs to the steel smelting-continuous casting technical field, a kind of novel crystallization device submersed nozzle that effectively prevents continuous casting steel billet volume slag particularly is provided, play important effect, improved the steel billet degree of purity stablizing liquid fluctuating in the casting process.
Background technology
Casting process reaches about 50% because the Surface Defects in Steel Plate ratio that crystallizer protecting residue " volume slag " causes is very high.In the crystallizer molten steel flow behavior be the volume slag major reason, especially crystallizer protecting residue-molten steel at the interface fluid flow characteristics be to cause the immediate cause of volume slag.The research worker has studied by methods such as physical analogy and numerical simulations and has influenced crystallizer inner fluid flow factor both at home and abroad, by optimizing the submersed nozzle technological parameter, adopting measures such as electromagnetic braking and the automatic control of liquid level to improve crystallizer inner fluid flow regime, to prevent to roll up slag to greatest extent.
Sum up domestic and international worker's result of study, volume slag mode mainly contains two kinds: (1) surface volume slag.The mechanism of surperficial volume slag: the interior molten steel of crystallizer flows out from two outlets of submersed nozzle, arrives near narrow limit base shell back formation two stocks stream up and down.Shunting upwards is up along leptoprosopy, changes direction after impacting meniscus, turns back downwards, forms surface stream.Because the existence of interfacial tension, the part covering slag is flowed with molten steel, cause covering slag near the centre position of the mouth of a river and leptoprosopy, to assemble, form downward projection, strong excessively as surface velocity, some projectioies break away from the protection slag blanket, are refluxed by molten steel surface and bring molten steel inside into, the part covering slag is caught at the base shell that the inner floating-upward process of molten steel can be grown, forms surface volume slag; On the other hand, downward branch flows through when strong after steel flow that submersed nozzle flows out arrives narrow limit, can cause crystallizer molten steel surface heat supply deficiency; the covering slag fusion is bad; because mobile bad, it is subcutaneous that the part covering slag can be wrapped in strand from inside to outside by molten steel, causes dreg defect.(2) liquid level swirl volume slag.Liquid level swirl volume slag mechanism: do not wait because the turbulent flow or the mouth of a river go out to flow the asymmetric surface stream flow velocity of both sides, the mouth of a river that will cause in asymmetric flow field, both sides, the mouth of a river of causing, after surface velocity differs to a certain degree, when converging, two surface streams produce whirlpool near the mouth of a river in the less side of speed.The energy of this whirlpool can be rolled into covering slag molten steel inside when big.In addition; when molten steel is gone out from the mouth of a river; outlet top, the mouth of a river can form negative pressuren zone; whirlpool can be stretched, strengthen under the influence of negative pressuren zone; drip by the slag of vortices entrain and just might be brought to depths, molten steel molten bath; the part covering slag is caught at the base shell that the inner floating-upward process of molten steel can be grown, forms whirlpool volume slag.Be that the sort of volume slag mode all has direct relation with the structure and the occupation mode of submersed nozzle.The factor that influences crystallizer volume slag has: bottom matrix of (1) submersed nozzle and convex structure are to the influence of liquid fluctuating in the crystallizer.The liquid fluctuating at the convex structure mouth of a river is little, meniscus is more dead, this is because after stream strand is flushed to mouth of a river bottom downwards from top, the mouth of a river, directly rived by the point of mouth of a river bottom fork and to be two parts, thereby make stream burst impact velocity downward in crystallizer excessive, stream strand impact depth is dark, and the disturbance of mold liquid level is reduced.But because speed is big during stream plume delivery port side opening, the negative pressure that causes on side opening top, the mouth of a river is inevitable also to be increased, thereby causes the liquid fluctuating at wall place, the mouth of a river to strengthen, so the convex mouth of a river, meniscus is dead but wall place, mouth of a river liquid fluctuating is excessive.(2) mouth of a river immersion depth is to the influence of volume slag.Along with the increase of immersion depth, the liquid fluctuating value is obviously on a declining curve.This is that it is big that the development space of last backflow becomes because after the immersion depth increase, and intensity will inevitably weaken, and liquid fluctuating will weaken, and liquid level tends to be steady.(3) mouth of a river exit angle is to the influence of volume slag.The angle of the mouth of a river, bilateral hole outlet inclination effect jet, along with the increase of inclination angle (downwards) angle, crystallizer surface flow velocity and liquid level wave height all reduce.It is more little that the mouth of a river exports downward angle, big more to the influence of volume slag.(4) influence of mouth of a river discharge area.Mouth of a river discharge area has the influence of the pros and cons to liquid fluctuating, along with the increase of discharge area, has reduced the speed of place, mouth of a river steel flow thigh, can reduce a stream burst shock point speed on the one hand, and liquid fluctuating is reduced; On the other hand, because the reducing of steel flow velocity degree drift angle, move on impacting a little and cause bigger fluctuation.
Summary of the invention
The utility model purpose is to provide a kind of crystallizer submersed nozzle that prevents continuous casting steel billet volume slag, can stablize the control liquid level fluctuation of molten steel, and protection slag blanket heat is supplied with rationally evenly.
The utility model relates to a kind of crystallizer submersed nozzle that prevents continuous casting steel billet volume slag, comprise mouth of a river body, delivery port, distributary base, delivery port is two hole left-right symmetry, distributary base is established in positive lower end, the mouth of a river, delivery port is downward inclination angle, and mouth of a river body is the reducing type structure, and top, mouth of a river internal orifice dimension is Φ 60-80mm, bottom, mouth of a river internal diameter is Φ 90-100mm, and the downward inclination angle a of delivery port is 65-80 °.
The design of this kind of advantage submersed nozzle of the present invention have tapping steel levelling steady, reflux rationally, lower to slab leptoprosopy impulsive force, last backflows is even reasonable, and crystallizer protecting residue can be melted fully.Liquid fluctuating is all stable to be controlled at ± 5mm in, prevented molten steel volume slag effectively.
Description of drawings
Fig. 1 is a crystallizer submersed nozzle schematic diagram.
Among the figure: 1 is delivery port, and 2 is distributary base, and 3 is the intake variable gauge structure, and 4 is mouth of a river body, and a is the downward inclination angle of delivery port.
The specific embodiment
Example 1:
Use the mouth of a river of the present invention to be of a size of: two holes symmetry delivery port, mouth of a river entire length is 840mm, from the top to 475mm mouth of a river internal orifice dimension be Φ 75mm, become Φ 96mm to bottom, mouth of a river internal diameter again, the delivery port angle is apart from 74 ° of vertical direction, and the outer length of diplopore delivery port is 105mm.
Pour into a mould certain medium carbon steel slab, cross dimensions is 1500mm * 230mm, and it is 130mm that crystallizer immerses mouth of a river insertion depth, and pulling rate is 1.2m/min, waters 26 ° of time average degrees of superheat.All in standard value ± 5mm scope, the covering slag fusing is good for liquid level fluctuation of molten steel in the whole casting process, and the liquid slag layer thickness is 12mm, and the covering slag consumption is 0.58kg/t.
Strand rolls off the production line its surface impurities is carried out bulk sample electrolysis and sem analysis check, finds no covering slag and is involved in the steel billet top layer, and the strand degree of purity increases.
Example 2:
Use the mouth of a river of the present invention to be of a size of: two holes symmetry delivery port, mouth of a river entire length is 840mm, from the top to 475mm mouth of a river internal orifice dimension be Φ 75mm, become Φ 96mm to bottom, mouth of a river internal diameter again, the delivery port angle is apart from 74 ° of vertical direction, and the outer length of diplopore delivery port is 105mm.
Use this mouth of a river to pour into a mould certain medium carbon steel slab, cross dimensions is 1550mm * 230mm, and it is 125mm that crystallizer is invaded mouth of a river insertion depth, waters 25 ° of time average degrees of superheat, and pulling rate is 1.2m/min.All in standard value ± 5mm scope, the covering slag fusing is good for liquid level fluctuation of molten steel in the whole casting process, and the liquid slag layer thickness is 11～12mm, and the covering slag consumption is 0.55kg/t.
Strand rolls off the production line its surface impurities is carried out bulk sample electrolysis and sem analysis check, finds no covering slag and is involved in the steel billet top layer, and the strand degree of purity increases.
Example 3:
Use the mouth of a river of the present invention to be of a size of: two holes symmetry delivery port, mouth of a river entire length is 840mm, from the top to 475mm mouth of a river internal orifice dimension be Φ 75mm, become Φ 96mm to bottom, mouth of a river internal diameter again, the delivery port angle is apart from 74 ° of vertical direction, and the outer length of diplopore delivery port is 105mm.
Use this mouth of a river cast pipeline plate slab, cross dimensions is 1600mm * 230mm, and it is 125mm that crystallizer is invaded mouth of a river insertion depth, waters 25 ° of time average degrees of superheat, and pulling rate is 1.1m/min.All in standard value ± 5mm scope, the covering slag fusing is good for liquid level fluctuation of molten steel in the whole casting process, and the liquid slag layer thickness is 11～12mm, and the covering slag consumption is 0.6kg/t.
Strand rolls off the production line its surface impurities is carried out bulk sample electrolysis and sem analysis check, finds no covering slag and is involved in the steel billet top layer, and the strand degree of purity increases.
Claims (1)
1. crystallizer submersed nozzle that prevents continuous casting steel billet volume slag, comprise mouth of a river body, delivery port, distributary base, delivery port is two hole left-right symmetry, distributary base is established in positive lower end, the mouth of a river, delivery port is downward inclination angle, it is characterized in that: mouth of a river body (4) is the reducing type structure, and top, mouth of a river internal orifice dimension is Φ 60-80mm, bottom, mouth of a river internal diameter is Φ 90-100mm, and delivery port (1) inclination angle a downwards is 65-80 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201586489U CN201644781U (en) | 2010-04-12 | 2010-04-12 | Crystallizer submersed nozzle for preventing continuous cast slab from rolling slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201586489U CN201644781U (en) | 2010-04-12 | 2010-04-12 | Crystallizer submersed nozzle for preventing continuous cast slab from rolling slag |
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| CN201644781U true CN201644781U (en) | 2010-11-24 |
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|---|---|---|---|
| CN2010201586489U Expired - Fee Related CN201644781U (en) | 2010-04-12 | 2010-04-12 | Crystallizer submersed nozzle for preventing continuous cast slab from rolling slag |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325126A (en) * | 2014-10-13 | 2015-02-04 | 上海大学 | Submersed nozzle for controlling metal fluid to flow in slab continuous casting process |
| CN105499553A (en) * | 2015-12-08 | 2016-04-20 | 华耐国际（宜兴）高级陶瓷有限公司 | Submersed nozzle for ESP (endless strip production) thin slab |
| CN110315061A (en) * | 2018-03-30 | 2019-10-11 | 宝山钢铁股份有限公司 | A kind of mouth of a river that can prevent pipeline and discharge hole bottom from adhering to |
| CN115255304A (en) * | 2022-06-14 | 2022-11-01 | 江阴兴澄特种钢铁有限公司 | Continuous casting method for controlling macroscopic inclusions in steel |
-
2010
- 2010-04-12 CN CN2010201586489U patent/CN201644781U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325126A (en) * | 2014-10-13 | 2015-02-04 | 上海大学 | Submersed nozzle for controlling metal fluid to flow in slab continuous casting process |
| CN105499553A (en) * | 2015-12-08 | 2016-04-20 | 华耐国际（宜兴）高级陶瓷有限公司 | Submersed nozzle for ESP (endless strip production) thin slab |
| CN105499553B (en) * | 2015-12-08 | 2018-10-19 | 华耐国际（宜兴）高级陶瓷有限公司 | A kind of ESP sheet billets submersed nozzle |
| CN110315061A (en) * | 2018-03-30 | 2019-10-11 | 宝山钢铁股份有限公司 | A kind of mouth of a river that can prevent pipeline and discharge hole bottom from adhering to |
| CN110315061B (en) * | 2018-03-30 | 2021-10-19 | 宝山钢铁股份有限公司 | Can prevent mouth of a river of pipeline and spit hole bottom adhesion |
| CN115255304A (en) * | 2022-06-14 | 2022-11-01 | 江阴兴澄特种钢铁有限公司 | Continuous casting method for controlling macroscopic inclusions in steel |
| CN115255304B (en) * | 2022-06-14 | 2023-10-10 | 江阴兴澄特种钢铁有限公司 | Continuous casting method for controlling macroscopic inclusion in steel |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20190412 |
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| CF01 | Termination of patent right due to non-payment of annual fee |