CN203541512U - Braking type submerged nozzle used for continuous casting of plate blanks or shaped blanks - Google Patents
Braking type submerged nozzle used for continuous casting of plate blanks or shaped blanks Download PDFInfo
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- CN203541512U CN203541512U CN201320689894.0U CN201320689894U CN203541512U CN 203541512 U CN203541512 U CN 203541512U CN 201320689894 U CN201320689894 U CN 201320689894U CN 203541512 U CN203541512 U CN 203541512U
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Abstract
The utility model relates to a braking type submerged nozzle used for continuous casting of plate blanks or shaped blanks. The braking type submerged nozzle comprises nozzle side walls, a bottom and an inner hole shaped like the Chinese character 'ren', wherein the bottom and the nozzle side walls are integrated, the inner hole is defined by the nozzle side walls and the bottom, and the top of the inner hole is provided with an opening. The side walls of the two opening ends of the inner hole are respectively provided with a downward inclined runner hole, and inlets of the runner holes are communicated with the opening ends. According to the braking type submerged nozzle, the initial kinetic energy and the specific trajectory of molten steel are utilized for acting on molten steel which is already contained in a crystallizer, so that the mode of the flow field of the molten steel is changed, and energy is better saved compared with electromagnetic braking. When the braking type submerged nozzle used for continuous casting of the plate blanks or the shaped blanks is used in the continuous casting process, if the position of the submerged nozzle in the vertical direction is found to be inappropriate, optimization of braking of flow of the molten steel in the crystallizer by the braking type submerged nozzle can be achieved by replacing different forms of submerged nozzles on line or finely adjusting the height of an intermediate tank or finely adjusting the pulling rate of the casting blanks.
Description
Technical field
The utility model relates to a kind of soaking water gap, relates in particular to a kind of for slab or shaped blank caster braking formula soaking water gap.
Background technology
At present, the crystallizer submersed nozzle that side, square, circle and slab (containing sheet billet) conticaster adopts, what generally adopt is the Straight with pod apertures, according to continuous casting section configuration or single hole or porous; For meeting the mobile reasonability of molten steel in mold, when pass angle design, be designed with in the vertical direction certain angle; But these mouths of a river when design all only the flow field in crystallizer rationalize as far as possible, and do not consider because of the impact of M-EMS, to cause the possibility of slag in casting process, thereby cause continuous casting billet quality unstable.
Along with efficiently, high-quality, environmental protection, the exploitation of energy-saving casting machine, high pulling rate must strengthen flow and the flow velocity of steel flow thigh in crystallizer, in casting blank solidification process, the impact depth of molten steel in liquid core and the unstability of meniscus place molten steel hump height will have been increased, even if adopt the traditional type submersed nozzle after optimizing, also may not necessarily there be sufficient improvement or optimization to slab quality, in any case, under existence conditions, no matter adopt the mouth of a river of which kind of traditional approach or structure, keep away equally the unavoidable stirring to crystallizer protecting residue liquid slag layer to crystallizer top backflow molten steel because of electromagnetic agitation, certainly will cause the undulating value of mold liquid level to raise, cause slag and finally affect slab quality, simultaneously, also very unfavorable to the floating of field trash in molten steel in mold.Therefore, do not increasing under the prerequisite of equipment investment, it is limited depending merely on that current technology taps the latent power.Requirement slab quality classification standard being improved constantly for adapting to industry, studies and applies novel submersed nozzle, necessary.
Since electromagnetic agitating technology is applied to continuous casting process, for a new platform has been found in the lifting of slab quality, therefore, in the integral body of modern conticaster forms, nearly all join figurate electromagnetic stirring system, and the application achievements of up-to-date electromagnetic agitating technology is exactly the employing of electromagnetic brake technology in crystallizer.
Fluid in crystallizer is under the percussion of beam, is separated into upper and lower two recirculating zones after running into crystallizer wall.Upwards backflowing along crystallizer sidewall near crystallizer molten steel surface in upper recirculating zone, then flows to mouth of a river direction; Lower recirculating zone stream thigh is after impacting crystallizer sidewall, effect due to inertia and gravity, after impacting certain depth downwards, be separated into again two parts, a part is solidified behind " coral " interface running into, change its flow direction to crystallizer center flow starts back near the mouth of a river, another part joins process of setting and flowing downward; And this part of molten steel is in the process of flowing downward, may be separated into again two strands, even more, behind M-EMS region, owing to being subject to the effect of electromagnetic force, slowing down or decay it downwards or flow to the energy at center, until molten steel slowly solidifies, flowing approaches while stopping, reflux course just fades away.In this flow process, crystallizer sidewall is impacted in the be hit effect of power of stream thigh, has a strong impact on the uniformity growth of crystallizer sidewall base shell and the size of upper and lower back-flow velocity.Upper back-flow velocity increase directly affects again the steady degree of mold liquid level and the size that the mouth of a river two side refluxs interactions produce whirlpool.
Because the refluxed effect of molten steel of mold liquid level produces fluctuation, too little heat transfer and the fusing that certainly will affect covering slag of fluctuate, does not become the molten slag layer of stablizing and having adequate thickness, thereby affects the ability of lubricant effect and the dross inclusion adsorption of slag film; And the too large field trash that can cause covering slag or just be adsorbed of fluctuation is involved in steel, affect slab quality.Meanwhile, due near mutual collision and the extruding of two recirculating zones mouth of a river, form whirlpool, only have the faint turn producing for enough hour when swirling flow, just can not affect covering slag and be involved in strand; But when turn is serious, can produce larger funnel whirlpool, make the covering slag on molten steel face directly be rolled onto exit, the mouth of a river, in casting process, molten steel be caused to secondary pollution, this will have a strong impact on the cleanliness factor of molten steel.
Utility model content
The technical problems to be solved in the utility model is: the energy waste causing in order to solve electromagnetic braking, and the nonadjustable problem after installing, the utility model provides a kind of and solves the problems referred to above for slab or shaped blank caster braking formula soaking water gap.
The utility model solves the technical scheme that its technical problem adopts: a kind of for slab or shaped blank caster braking formula soaking water gap, the open-topped herringbone endoporus that comprises mouth of a river sidewall, surrounds with the bottom of sidewall one and sidewall and bottom, on the sidewall of two openends of described endoporus, be respectively arranged with downward-sloping runner hole, the entrance in described runner hole is communicated with openend.By runner hole, coming increases an external rotation brake power to crystallizer top molten steel, moment forces opposite direction with electromagnetic agitation generation in former crystallizer, with the original revolving force of damping, can make mold liquid level more tend to be steady, do not allow the field trash having been adsorbed by crystallizer protecting residue return to molten steel, greatly improve slab quality; The bottom of endoporus arranges two openends, recirculating zone is diminished, impact depth also diminishes simultaneously, because molten steel just has certain rotation amount from endoporus goes out stream, after clashing into leptoprosopy, start to be further strengthened along crystallizer screw, after entering leptoprosopy near zone, rotary speed is maximum, suppresses to greatest extent eddy current one time; Meanwhile, under outside centrifugal action, heart portion liquid is thrown out of and scrubs internal surface of crystallizer, under crystallizer recirculating zone reduce and rotatablely moving of liquid is conducive to the floating of field trash, reduce strand and be mingled with.
The line of centres between two openends of the center line in each runner hole and endoporus is parallel, and the center line in the runner hole of two open end lays respectively at the both sides of the line of centres between two openends of endoporus.
In order to make better effects if, the outlet in described runner hole is provided with and can makes stream strand produce the oblique angle extending out of equidirectional rotation.Oblique angle is only arranged on the exit in runner hole.
Further, specifically, described runner hole has two, and cross section is oval, is separately positioned on the sidewall of two openends.
In order to strengthen effect, the angle at described oblique angle is 41 °.
Further, specifically, the downward-sloping angle in described runner hole is 30 °-35 °.
Experiment shows, the downward-sloping angle in described runner hole is 32 °, and effect is best.
The beneficial effects of the utility model are,
1) can derive fast molten steel overheat, stablize the consumption of covering slag, impel and form uniform slag film, guarantee that lubricated index is relatively stable; For the molten steel part of returning to dirty thigh, be braked after burst cutting of formula mouth of a river stream, its rising kinetic energy of decaying, slowly arrives near mold liquid level it, thereby makes liquid level fluctuation of crystallizer stable;
2) the specific version of this brake type soaking water gap, because stream strand flows out from first flow hole with certain angle, can be with certain first kinetic energy in ferrostatic pressure situation, can automatically produce screw type rotation, direction is contrary with the direction of rotation of M-EMS upper steel water generates, to eliminate it, produce vortex kinetic energy, reach the object of stablizing liquid level;
3) by the research in crystallizer flow field is shown, mold liquid level is because backflow effect produces fluctuation, affect steel inclusion dissolves, spreads in covering slag, and cause crystallizer meniscus slag, simultaneously, due to the interaction of Liang Ge recirculating zone, both sides, the mouth of a river, near the mouth of a river, be easy to again produce swirling flow, swirling flow hour only produces faint turn on liquid level; And when mouth of a river design is unreasonable or insertion depth is improper, turn is serious.Because the upwelling thigh decay distance of upper whirlpool is shorter, impingement flow is larger on the impact of mold liquid level, cause liquid level fluctuation of crystallizer large and near the mouth of a river, produce larger infundibulate vortex, this will cause slag aborning, have a strong impact on the cleanliness factor of strand, and adopt this problem of the utility model substantially can eliminate;
4) adopt the utility model very large on the macrostructure of strand and depth of chatter mark impact, from the situation of test, use brake type soaking water gap, the inner equiax crystal area of strand obviously adopts the mouth of a river of traditional approach to get well;
5) in process of the test, the strand comprehensive quality of producing during than 1.8m/min when pulling rate is controlled at 2.0m/min is good, proves that original design principle is correct, reliable;
6), in high-carbon steel continuous casting process, for improving strand Central Carbon Segregation, there is certain help;
7) brake area of electromagnetic brake is non-adjustable, and adopts brake type function submersed nozzle suitably to adjust brake type soaking water gap form according to different process control conditions, to increase its adjusting range;
8) stable crystalline device molten steel face and meniscus shape, stable and optimize the floating path of field trash, improve slab quality, especially in conticaster vibrational system also not before upgrading or transformation, this mouth of a river can fully demonstrate the feature of improving casting billet surface oscillation mark;
9) can realize molten steel braking, substitute electromagnetic brake, meanwhile, less investment, effective, substantially do not increase expense, economize on electricity, non-maintaining, freedom from repairs;
10) mouth of a river of the present invention is compared with the conventional mouth of a river, only disposablely in process drops into part mould costs of manufacture more, and the service life at the mouth of a river with traditional suitable, ton steel cost can increase hardly;
11) in modern continuous casting process operating process, rely on present capital and technical conditions, courageously carry out technological innovation, use brake type soaking water gap, for improving slab quality, Improving The Quality of Products grade, the in the situation that of relatively weak in existing market, development prospect is fine.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 be the utility model for the front view of slab or shaped blank caster braking formula soaking water gap,
Fig. 2 be the utility model for the top view of slab or shaped blank caster braking formula soaking water gap,
Fig. 3 is the cutaway view of A-A in Fig. 1.
In figure 1, sidewall, 2, bottom, 3, endoporus, 4, runner hole, 5, center line, 6, the line of centres.
The specific embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, basic structure of the present utility model is only described in a schematic way, so it only show the formation relevant with the utility model.
As shown in Figure 1-2, the utility model is for slab or shaped blank caster braking formula soaking water gap, comprise mouth of a river sidewall 1, the open-topped herringbone endoporus 3 surrounding with the bottom 2 of sidewall 1 one and sidewall 1 and bottom 2, on the sidewall 1 of two openends of endoporus 3, be respectively arranged with downward-sloping runner hole 4, the entrance in runner hole 4 is communicated with openend, the line of centres 6 between 3 two openends of the center line 5 in each runner hole 4 and endoporus is parallel, the center line 5 in the runner hole 4 of two open end lays respectively at the both sides of the line of centres 6 between 3 two openends of endoporus, certainly as shown in Figure 3, it is the schematic diagram under limiting condition, the position relationship in runner hole 4 also can be done some distortion, the outlet in runner hole 4 is provided with and can makes stream strand produce the oblique angle extending out of equidirectional rotation, runner hole 4 has two, cross section is oval, be separately positioned on the sidewall 1 of two openends, the angle at oblique angle is 41 °, the downward-sloping angle in runner hole 4 is 30 °-35 °, the downward-sloping angle in runner hole 4 is 32 °.
The utility model is for slab or shaped blank caster braking formula soaking water gap, can be made into monoblock type, also can be applied to combined type (bipartial), integral water gap: tundish upper nozzle and soaking water gap of the present utility model are as a whole, flow control adopts stopper to control; But need configuration emergency gate in addition; The combined type mouth of a river: tundish upper nozzle and submersed nozzle of the present utility model are two separate components; Flow control can be controlled with stopper, and upper and lower junction is taked seal approach; If adopt slide type flow control, under slide plate, dock with submersed nozzle sealing at the mouth of a river, does not need to configure emergency gate.
The design principle of brake type submersed nozzle is similar to the application principle of electromagnetic braking, but also has its feature separately:
1) electromagnetic braking is to utilize electromagnetic action, and the molten steel in crystallizer is applied to external magnetic field, thereby affects the flow trace of molten steel; And brake type soaking water gap is first kinetic energy and the interior existing molten steel of special exercise track effect crystallizer that utilizes molten steel self, thereby the mode of change molten steel flow field belongs to energy saver mode;
2) electromagnetic braking is the molten steel in crystallizer to be applied to the magnetic field of a horizontal mostly; And the stream thigh of brake type soaking water gap is with certain (or upwards) downwards flows at angles, thereby respectively there is the component turning effort of a horizontal and vertical direction in molten steel, be conducive to the floating condition that molten steel in mold meets field trash under function composite by electromagnetic stirring, simultaneously, also liquid fluctuating value that can stable crystalline device, the melting rate of steady heat transfer and covering slag;
3) once electromagnetic braking equipment install, the braking action region to molten steel in mold, generally no longer adjustable in process of production; And brake type soaking water gap, if in casting process, find that vertical direction position is improper, can, by changing online multi-form submersed nozzle or fine setting pans height or fine setting Casting speed, realize the optimization that brake type soaking water gap flows and brakes molten steel in mold;
Utility model principle for slab or shaped blank caster braking formula soaking water gap:
The utility model, for slab or shaped blank caster braking formula soaking water gap, in use no doubt has its many features, but when design, must meet its design principle.
According to one's analysis, the most outward appearance of strand and blemish are to form in the improper process of setting of molten steel in crystallizer, and the process of setting of molten steel in crystallizer, very important position is exactly the meniscus place at crystallizer, so, when this brake type soaking water gap of design, necessarily can not ignore the feature of crystallizer flow field on meniscus shape impact.
1) impact of mouth of a river insertion depth
The principle of brake type soaking water gap insertion depth, the main factor of considering is: main flow, when running into crystallizer sidewall, will be mapped to solid slag diaphragm area scarcely downwards, meanwhile, takes again liquid level fluctuation of crystallizer into account in a rational fluctuation range value.Therefore, in continuous casting production process, for different steel grades and pulling rate, section, optimize selective freezing device covering slag, stablize its lubricated index.And be not directly mapped to meniscus hump place to the jet thigh of upper reaches thigh, and should penetrate in meniscus and melt cinder face flex point by near liquid level central side.Generally, improve Casting speed and the mouth of a river can be inserted more deeply, the needs that raise to adapt to the stable and lubricated index of crystallizer meniscus, but prerequisite is in the time of must guaranteeing out crystallizer, to have enough shell thicknesses.
2) by detecting maximum wave height value, optimize the mouth of a river
For different process conditions and steel grade requirement, the crystallizer submersed nozzle form that choice for use is good, should make molten steel in mold liquid level mean wave height value (that is: crest value-trough value) less, and undulating value is relatively stable and maximum wave height value is reasonable.Be intended to the burn-off rate of stable meniscus place hump height and covering slag, to stablize strand depth of chatter mark, improve slab quality.
3) crystallizer sidewall surge is analyzed
Under different pulling rates and mouth of a river insertion depth condition, molten steel is different to the surge extreme difference of crystallizer sidewall.Meanwhile, while adopting the mouth of a river of different structure form, stream thigh is also different to the maximum impact pressure point of crystallizer sidewall.The maximum of surge and the difference of minimum of a value are less, just illustrate that mouth of a river stream thigh is less and stable to the impulsive force of base shell in crystallizer, are conducive to the growth of base shell.
4) optimize mouth of a river parameter
Mouth of a river stream thigh after optimization, to the uniformity of crystallizer sidewall impact and better to the effect situation of molten steel face, is conducive to the floating of base hull shape one-tenth and steel inclusion, and the fluctuation that the effect of mold liquid level is produced is also less, thereby can improve slab quality.For same crystallizer, the effect of using the difform mouth of a river to obtain with pulling rate is different, and by optimizing, selection can meet need of production and be conducive to improve the submersed nozzle form of slab quality.
Example explanation:
1) slab caster, when producing 1470mm * 250mm Q345B steel, has carried out serial hot pilot production for flat chisel type submersed nozzle used.Test shows, the submersed nozzle of developing can meet the requirement of sheet billet continuous casting full guard pouring technology.By two slag lines, operate, single mouth of a river is watered at most continuously the steel time and can be reached more than 500 minutes, and slag line depth of erosion is 8～10mm the most deeply, within scope of design;
2) hot pilot production tentative confirmation also, flat chisel type submersed nozzle watering after adjustment has well stable crystalline device molten metal pool level and impels the effect moving on high-temperature region under injection-molded, guarantee that casting machine realizes permanent pulling rate and produce.The in the situation that of stable control bath surface, the mold liquid level active degree while producing is at the scene also because moving and be significantly improved on high-temperature region, especially when producing the test of near-net-shape " H " shaped steel strand, outstanding to the improvement of wingtip;
3) in process of the test, crystallizer bath surface is all covered by black slag, and thickness of slag layer is evenly distributed.In the situation that covering slag slag blanket gross thickness is basically identical (35～45mm), liquid slag layer thickness has reached 8mm left and right, 4～5mm when adopting other mouth of a river has improved nearly one times, and slag charge consumption has simultaneously reached 0.65kg/t left and right, also increase than before 0.03～0.05kg/t;
4) casting billet surface temperature measurement data shows, before withdrawal straightening machine, each surface temperature of strand has all exceeded approximately 30 ℃ than in the past, and each Temperature Distribution sees the following form;
Former technique and use flat chisel type water-gap pouring technique withdrawal straightening machine leading portion surface temperature distribution (coefficient: 0.9)
5) be conducive to reduce the stress of strand in aligning process and reduce the defects such as transverse fissure produce.Test strand has been carried out to low power sampling and check, result points out that Inner Quality of Billet has clear improvement, adopt the utility model to reach 1.0 grades of category-Bs for the strand center porosity of slab or shaped blank caster braking formula soaking water gap, adopt the strand center porosity of traditional Outlet Forms cast mostly to be 1.5 grades of category-Bs;
Aspect strand presentation quality, adopt the strand for producing after slab or shaped blank caster braking formula soaking water gap of the present utility model, integral surface quality is good, do not find that lobe defect produces, the depth of chatter mark of strand obviously alleviates before using, each rank steel grade casting billet surface oscillation mark of hot pilot production is clear and more shallow, from original 1mm left and right, be relieved to 0.3 current～0.4mm, the information feeding back from rolling process judges, lumber recovery has improved 0.2% before also using, and mill bar quality is normal.
The above-mentioned foundation desirable embodiment of the present utility model of take is enlightenment, and by above-mentioned description, relevant staff can, within not departing from the scope of this utility model technological thought, carry out various change and modification completely.The technical scope of this utility model is not limited to the content on description, must determine its technical scope according to claim scope.
Claims (7)
1. one kind for slab or shaped blank caster braking formula soaking water gap, it is characterized in that: the open-topped herringbone endoporus (3) that comprises mouth of a river sidewall (1), surrounds with the bottom (2) of sidewall (1) one and sidewall (1) and bottom (2), on the sidewall (1) of two openends of described endoporus (3), be respectively arranged with downward-sloping runner hole (4), the entrance in described runner hole (4) is communicated with openend.
2. as claimed in claim 1 for slab or shaped blank caster braking formula soaking water gap, it is characterized in that: the line of centres (6) between (3) two openends of the center line (5) in each runner hole (4) and endoporus is parallel, and the center line (5) in the runner hole (4) of two open end lays respectively at the both sides of the line of centres (6) between (3) two openends of endoporus.
3. as claimed in claim 2 for slab or shaped blank caster braking formula soaking water gap, it is characterized in that: the outlet in described runner hole (4) is provided with and can makes stream strand produce the oblique angle extending out of equidirectional rotation.
4. as claimed in claim 3 for slab or shaped blank caster braking formula soaking water gap, it is characterized in that: described runner hole (4) has two, cross section is oval, is separately positioned on the sidewall (1) of two openends.
5. as claimed in claim 4 for slab or shaped blank caster braking formula soaking water gap, it is characterized in that: the angle at described oblique angle is 41 °.
6. as claimed in claim 5 for slab or shaped blank caster braking formula soaking water gap, it is characterized in that: the described downward-sloping angle in runner hole (4) is 30 °-35 °.
7. as claimed in claim 6 for slab or shaped blank caster braking formula soaking water gap, it is characterized in that: the described downward-sloping angle in runner hole (4) is 32 °.
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| CN201320689894.0U CN203541512U (en) | 2013-11-01 | 2013-11-01 | Braking type submerged nozzle used for continuous casting of plate blanks or shaped blanks |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057077A (en) * | 2014-07-08 | 2014-09-24 | 华耐国际（宜兴）高级陶瓷有限公司 | High-pulling-speed sheet billet immersion-type water opening |
| CN108393480A (en) * | 2018-05-17 | 2018-08-14 | 山东钢铁股份有限公司 | A kind of herringbone fashion suitable for Profiled Slab CCM full guard casting shunts the mouth of a river |
| CN109570482A (en) * | 2018-12-06 | 2019-04-05 | 莱芜钢铁集团银山型钢有限公司 | A kind of crystallizer submersed nozzle and application method of the casting of Hot Metal in Beam Blank single-point unequal protection |
| CN110976791A (en) * | 2019-12-28 | 2020-04-10 | 西南铝业（集团）有限责任公司 | Self-spinning shunting bag and aluminum alloy casting method |
| CN115194107A (en) * | 2022-07-13 | 2022-10-18 | 沈阳工程学院 | Multi-segment independently adjustable composite magnetic field device and method for controlling molten metal flow |
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2013
- 2013-11-01 CN CN201320689894.0U patent/CN203541512U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057077A (en) * | 2014-07-08 | 2014-09-24 | 华耐国际（宜兴）高级陶瓷有限公司 | High-pulling-speed sheet billet immersion-type water opening |
| CN108393480A (en) * | 2018-05-17 | 2018-08-14 | 山东钢铁股份有限公司 | A kind of herringbone fashion suitable for Profiled Slab CCM full guard casting shunts the mouth of a river |
| CN109570482A (en) * | 2018-12-06 | 2019-04-05 | 莱芜钢铁集团银山型钢有限公司 | A kind of crystallizer submersed nozzle and application method of the casting of Hot Metal in Beam Blank single-point unequal protection |
| CN109570482B (en) * | 2018-12-06 | 2021-04-13 | 莱芜钢铁集团银山型钢有限公司 | Crystallizer submerged nozzle for single-point non-equilibrium protection casting of beam blank and using method |
| CN110976791A (en) * | 2019-12-28 | 2020-04-10 | 西南铝业（集团）有限责任公司 | Self-spinning shunting bag and aluminum alloy casting method |
| CN115194107A (en) * | 2022-07-13 | 2022-10-18 | 沈阳工程学院 | Multi-segment independently adjustable composite magnetic field device and method for controlling molten metal flow |
| CN115194107B (en) * | 2022-07-13 | 2023-05-16 | 沈阳工程学院 | Multi-stage independent adjustable composite magnetic field device and method for controlling metal liquid flow |
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