CN102794445B - Slab continuous casting submersed nozzle - Google Patents
Slab continuous casting submersed nozzle Download PDFInfo
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- CN102794445B CN102794445B CN201210242264.9A CN201210242264A CN102794445B CN 102794445 B CN102794445 B CN 102794445B CN 201210242264 A CN201210242264 A CN 201210242264A CN 102794445 B CN102794445 B CN 102794445B
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Abstract
The invention relates to a slab continuous casting submersed nozzle. The slab continuous casting submersed nozzle consists of a vertical section and a horizontal section; a pair of side holes are formed in the side wall close to the upper side of the bottom of the slab continuous casting submersed nozzle; two side holes are communicated with a hollow inner cavity; the wall surfaces around the side holes extend in the horizontal direction to form the horizontal section; the wall surface of the horizontal section forms a tubular pipeline the shape of which is identical to that of the side holes in an encircling manner; one end of the tubular channel is connected with the side holes; the other end of the tubular channel forms the semi-sealed surface; and an elongated opening identical to the length of the horizontal section is formed in the wall surface of the upper end of the tubular channel. According to the technical scheme, a steel liquid flowing channel is enlarged, and the steel liquid can be fully diffused to the cross section of the whole crystallizer, so that the transverse temperature of the crystallizer and the uniformity of components are guaranteed to ensure that the heat center of high-temperature steel liquid subjected to pouring is moved upwards; a reasonable temperature trapezoid is guaranteed; the normal growth of casting blank is facilitated; flotation removal of nonmetallic inclusion and bubbles is facilitated; the remelting and the destroy of a blank shell is avoided; the disturbance of the steel liquid on the liquid level of the crystallizer is reduced; the smoothness of continuous casting process is facilitated; and the quality of the casting blank is improved.
Description
Technical field
The invention belongs to the continuous casting technical field of steel, more precisely, relate to a kind of slab continuous casting submerged nozzle.
Background technology
The continuous pouring of steel is the process liquid molten steel with certain degree of superheat being become the effigurate solid strand of tool by water mold continuous coo1ing, in the process, molten steel injects in crystallizer by the sleeve pipe needing a refractory material making from the metallurgical tank of upstream, and this refractory sleeve is called as submersed nozzle, submersed nozzle upper end is installed vertically on the bottom of upstream metallurgical tank, below crystallizer molten steel surface is inserted in lower end, its Main Function is the secondary oxidation preventing molten steel, nitrogenize, splash, avoid liquid level slag simultaneously, regulate flow pattern and the Temperature Distribution of Mold, thus impel the even zero defect growth of the base shell in crystallizer, and the gas as far as possible reduced in molten steel and non-metallic inclusion, because submersed nozzle is for raising slab quality, improve working conditions, stabilizing continuous casting operates and prevents the aspect such as casting billet surface and internal soundness defect from all having significant effect, therefore be widely used on the conticaster of countries in the world.
Usually, make submersed nozzle can play its metallurgy action preferably, immersion type water nozzle structure shape that just must be reasonable in design, thus obtain the reasonable crystallizer Flow and heat flux being adapted to current pouring condition, generally speaking, rational crystallizer Flow and heat flux comprises following three aspects: the liquid level fluctuation of crystallizer that (1) is suitable and surface velocity, its target be can prevent that liquid level is exposed, the unfavorable factor such as covering slag turnup and meniscus destruction, the normal melt of covering slag can be ensured again simultaneously; (2) the transversely uniform temperature of crystallizer and component distributing, its objective is the segregation of lobe and the uneven components generation preventing the excessive generation of horizontal thermal stress; (3) crystallizer longitudinally upper rational thermograde; In order to promote that base shell solidifies preferably, ensureing the thermal center (-tre) as far as possible should improving molten steel under above-mentioned two conditions, make in crystallizer, to form the low reasonable temperature gradient of upper temp high temperature of lower, so both can improve Inner Quality of Billet as far as possible, and can prevent again crystallizer from exporting base shell and cross thin and bleed-out.
Under prior art, continuous casting crystallizer for plate billet mainly adopts double-side-hole submersed nozzle to pour into a mould, its agent structure is the pipeline of the bottom end closure suppressed by refractory material, the inner chamber comprising the vertical direction of upper shed and symmetrical two side openings be connected with inner chamber, during cast, two side holes aims at leptoprosopy center, crystallizer both sides, the molten steel of upstream metallurgical tank flows into from the inner chamber upper shed of submersed nozzle, flow out from the symmetrical side opening of two sidewall near bottom surface, and enter in crystallizer, molten steel rebounds after side opening flows out shock crystallizer leptoprosopy, and form cocycle stream and lower circular flow, cocycle stream is formed mold liquid level and covering slag and impacts, lower circular flow is entered crystalliser feet.
In conjunction with before to mention the basic characteristics of rational crystallizer Flow and heat flux known, when adopting existing double-side-hole submersed nozzle to pour into a mould, usually following three drawbacks can be there are: first, flow out from side opening because high-temperature molten steel is direct afterwards from submersed nozzle inner chamber vertical current, lack necessary buffering, therefore the impact velocity of molten steel is very large, damages the nascent solidified shell of crystallizer leptoprosopy, also can cause the remelting of base shell, be unfavorable for the normal growth of base shell; Second; the effective area flowed out from mouth of a river side opening due to molten steel is less; therefore molten steel stream stock is more concentrated; comparatively large to the local assault near mould at narrow, the meniscus near leptoprosopy may be caused to occur larger liquid fluctuating or liquid level slag, and the liquid level position near the mouth of a river there will be the dead band of molten steel flow; molten steel temperature is lower; there will be covering slag crust time serious, meanwhile, this steel liquid flow state is also unfavorable for crystallizer transverse temperature and written homogenising.3rd, after molten steel impact crystallizer leptoprosopy, form upper and lower two backflows, in most cases, the circular flow of bottom molten steel is more, and crystallizer temperature of lower can be made so higher, upper temp is on the low side, rational thermograde can not be formed in the vertical, worsen the internal soundness of strand like this, be unfavorable for that the floating of field trash and bubble in molten steel is removed simultaneously.
Be in the utility model patent of CN201082465Y at notification number, disclose a kind of immersion water gap for continuously casting, one of them key character of this submersed nozzle is that the outlet of mouth of a river side opening has extension, this extension can play good water conservancy diversion and cushioning effect, but, because mouth of a river side opening extension prevents the diffusion of molten steel, make the solidified shell of the impact crystallizer leptoprosopy that the stream stock of water-gap outlets can be more concentrated, destroy the normal growth of leptoprosopy base shell, simultaneously, also the uniformity of the horizontal molten steel temperature of crystallizer and composition is unfavorable for very much, certainly, molten steel can not be made to keep upper temp high in the vertical, the Reasonable Mode that temperature of lower is low, therefore, this submersed nozzle can not effectively solve above-mentioned drawback.
Summary of the invention
The technical problem to be solved in the present invention is, for prior art above-mentioned deficiency and a kind of slab continuous casting submerged nozzle is provided, pass through the technical program, can effectively optimize continuous casting crystallizer for plate billet flow field and temperature field, avoid molten steel stream stock to the impact of leptoprosopy base shell, increase the temperature in crystallizer cross section and homogeneity of ingredients, and make molten steel thermal center (-tre) as far as possible on move, promote the reasonable growth of base shell and the rapid floating of field trash and bubble.
In order to achieve the above object, technical scheme of the present invention is achieved in that a kind of slab continuous casting submerged nozzle, be made up of vertical section and horizontal segment, the bottom that described vertical section comprises sidewall and closes, sidewall is connected with bottom, surround the hollow lumen of vertical direction upper top opening, the sidewall above bottom is provided with a contralateral exposure, and two side holes is connected with hollow lumen; The wall of described side opening surrounding extends to horizontal direction, form described horizontal segment, the wall of described horizontal segment surrounds the tubular conduit identical with side opening shape, tubular conduit one end is connected with side opening, other end bottom is closed, top perforate, and form semiclosed, the upper end wall of tubular conduit is provided with the thin-and-long opening identical with horizontal section length, and be connected with the perforate of semiclosed, form the final flow pass of molten steel.
In order to ensure that the molten steel that submersed nozzle flows out is uniformly distributed in the both sides of plate slab crystallizer, therefore the geomery of horizontal segment that extends out of described side opening and side opening is identical, and vertical section center line is axisymmetricly along the mouth of a river.
Described horizontal segment semiclosed both sides inwall upper surface is upwards outward-dipping inclined-plane from the inside to the outside, can molten steel be made to move upward so as far as possible, ensures the high temperature of mold liquid level and the smooth floating of field trash and bubble.
Described horizontal segment upper end thin-and-long opening is positioned at the center of both sides, horizontal segment upper end inwall, thin-and-long opening is provided with along both sides and outward-dipping leads slope, making elongated opening is from inside to outside expansion inclination angle, form "eight" shape, can make molten steel like this in the process flowed out, under the guide functions leading slope, be dispersed to the cross section of crystallizer very uniformly, be conducive to temperature and the homogenization of composition of molten steel.
The lateral surface of described vertical section and horizontal segment connection is provided with reinforcing inclined-plane, ensures that the connection of horizontal segment and vertical section is more solid and reliable, avoid horizontal segment under the impact of molten steel, occur fracture and come off.
The cross section of described vertical section hollow lumen and sidewall is set to circle, and rectangle or the front-back of band chamfering are plane, and the left and right sides is the flat type of cambered surface.
Described vertical section hollow lumen upper base surface is lower than edge under each side opening, and hollow intracavity bottom forms pit, more effectively cushions the impact dynamics of molten steel.
Described vertical section is positioned on the sidewall on side opening top, loop overlapping shape slag line.
On described vertical section and horizontal segment, all walls all adopt refractory material isostatic compaction.
Beneficial effect after employing technique scheme is: a kind of slab continuous casting submerged nozzle, is compared with prior art had the following advantages by technical scheme:
(1) because the horizontal extension section upper end of side opening has thin-and-long opening, is semiclosed away from side opening end, the two has been linked to be the flow pass of molten steel, this molten steel flow pass is larger, and more disperse on wide of crystallizer, molten steel can be made to flow out more uniformly, diffuse to more fully on the cross section of whole crystallizer, ensure that temperature and the homogeneity of ingredients of crystallizer transverse direction, be conducive to the even solidification of base shell.
(2) because the molten steel flow pass of side opening horizontal extension section is upwards pod apertures, therefore the high-temperature molten steel of cast can be made upwards to run as far as possible, thermal center (-tre) is moved, ensure that longitudinally upper rational temperature is trapezoidal, be conducive to the normal growth of strand and the raising of internal soundness, meanwhile, the floating being conducive to non-metallic inclusion and bubble is removed.
(3) because the horizontal extension section upper end of side opening has thin-and-long opening, be semiclosed top incline away from side opening end, the flow flowing out molten steel from the side can be greatly reduced like this, alleviate molten steel and come into being solidified shell intense impact in crystallizer side, avoid the remelting of base shell and destruction.
(4) because this submersed nozzle adopts the bottom surface of spill and side opening to extend horizontal segment; the flow direction of molten steel can be changed like this for twice; significantly cushion and the impact kinetic energy of the molten steel that dissipates; reduce molten steel to the disturbance of mold liquid level; prevent excessive liquid fluctuating and covering slag turnup, be conducive to continuous casting process direct motion and slab quality improvement.
Accompanying drawing explanation
Fig. 1 is the overall sectional view of the present invention.
Fig. 2 is the side view cutaway drawing of Fig. 1.
Fig. 3 is that the A-A of Fig. 1 is to sectional view.
Fig. 4 is that the B-B of Fig. 1 is to sectional view.
Fig. 5 is that the C-C of Fig. 1 is to sectional view.
Fig. 6 is that the D-D of Fig. 1 is to sectional view.
Fig. 7 is that in embodiments of the invention, submersed nozzle is arranged in the forward sectional view in plate slab crystallizer.
Fig. 8 is that in embodiments of the invention, submersed nozzle is arranged in the E-E sectional view in plate slab crystallizer.
Attached number in the figure is as follows, 1-vertically section, 11-sidewall, 12-bottom, 13-slag line, 14-hollow lumen, horizontal segment, 21-wall, 22-tubular conduit, 23-semiclosed, 24-the second side opening, 25-thin-and-long opening, 26-reinforce inclined-plane, 27 lead slope, 3-plate slab crystallizer.
Detailed description of the invention
Below in conjunction with specific embodiments of the invention and Figure of description 1-8, technical scheme of the present invention is described further.
As shown in Fig. 1 ~ Fig. 6, the slab continuous casting submerged nozzle that the present invention relates to, be made up of vertical section 1 and horizontal segment 2, the bottom 12 that described vertical section 1 comprises sidewall 11 and closes, the lateral surface of sidewall 11 is provided with slag line 13 circlewise, the degree of depth of described slag line 13 is 10 ~ 25mm, is highly 100 ~ 160mm, and bottom slag line 13 lower end is dried up mouth, 12 lower surface distances are 60 ~ 120mm; Described sidewall 11 is connected with bottom 12, and surrounds the hollow lumen 14 of top end opening on vertical direction, and the shape of cross section of described sidewall 11 and hollow lumen 4 can be circular, and the square or front and back of band chamfering are plane, left and right is the flat type of cambered surface.
Described sidewall 11 is provided with the side opening 15 that two size shape are identical, two side holes 15 along hollow lumen 14 center line axisymmetricly, and to be interconnected with hollow lumen 14.Described side opening 15 can be set to ellipse, the rectangle of band chamfering, and circular or left and right is semicircle, centre is square assembly, and described side opening 15 times edges are 10-40mm to the distance of the upper surface of bottom 12, make bottom 12 form pit relative to side opening 15.
The wall of described side opening 15 surrounding stretches out, form horizontal segment 2, extending level section 2 size shape of described two side holes 15 is also identical, and along vertical section 1 inner chamber 15 center line axisymmetricly, described side opening 15 and being symmetrical arranged of horizontal segment 2 are completely necessary, can ensure like this in the mouth of a river go out stream can symmetrically and evenly point to both sides, the mouth of a river, to ensure the harmony of overall Flow and heat flux.
Described horizontal segment 2 comprises wall 21 and semiclosed face 23, wall 21 surrounds the tubular conduit 22 of hollow, tubular conduit 22 shape size is identical with side opening 15, its one end is connected with side opening 15, form a bottom horizontal flow sheet passage, the other end is semiclosed face 23, the upper surface in semiclosed face 23 is inclined upwardly from inside to outside, inclination angle scope is 15 ° ~ 60 °, the top in semiclosed face 23 has the second side opening 24, semiclosed face 23 and the second side opening 24 sectional area are added the sectional area being tubular conduit 22, described wall 21 upper end center has thin-and-long opening 25, thin-and-long opening 25 length is identical with horizontal segment 2 length, run through whole horizontal segment 2.Described thin-and-long opening 25 cross section is lower little up and down trapezoidal, and namely opening wall is the angle of flare from inside to outside, and form "eight" shape, the angular range of the angle of flare and vertical curve is 10 ° ~ 50 °; Described thin-and-long opening 25 is connected with the second side opening 24, forms the passage that molten steel finally flows out submersed nozzle.
The wall 21 of described horizontal segment 2 connects together with the sidewall 11 of vertical section 1, wall about 21 lateral surface two lateral surfaces corresponding to sidewall 11 are mutually concordant, wall 21 is provided with reinforcing inclined-plane 26 near the outside wall surface up and down of sidewall 11, reinforcing inclined-plane 26 upper surface is inclined plane, and fill with solid refractory material between sidewall 21 and sidewall 11, to reach the object of reinforcing horizontal segment 2 and being connected with vertical section 1, described submersed nozzle adopts refractory material to pass through isostatic compaction, wall is interconnected becomes an entirety, this process is the common process that in actual production, submersed nozzle makes, therefore launch no longer in detail to describe.
As shown in Figure 7, Figure 8, in actual molten steel casting process, the horizontal segment 2 of submersed nozzle inserts below crystallizer 3 liquid level, and molten steel enters from the suitable for reading of inner chamber 14 of the vertical section of submersed nozzle 1, flow to bottom 12 under gravity, through the cushioning effect of bottom 12, flow into horizontal segment 2 from side opening 15, now, a part of molten steel flows along the tubular conduit 22 of horizontal segment 2 to the second side opening 24 place, and flowing in crystallizer 3 from the second side opening 24, flow in the meniscus region toward crystallizer 3 bight; The thin-and-long opening 25 of another part molten steel above tubular conduit 22 flows in crystallizer 3, flows in the meniscus region towards crystallizer 3 middle part.Molten steel flow downward in vertical section 1 and the direction of upwards flowing in horizontal segment 2 as shown by the arrows in Figure 7.
Molten steel flow mode in the present invention significantly can reduce the flowing kinetic energy of molten steel, reduce the impact of molten steel, ensure molten steel being uniformly distributed of temperature and composition on cross section, impel on molten steel thermal center (-tre) and move, be conducive to the floating of field trash and bubble, for the reasonable growth of nascent solidified shell and the raising of slab quality provide guarantee.
The above, be only better possible embodiments of the present invention, and be not used to limit scope of the present invention.
Claims (6)
1. a slab continuous casting submerged nozzle, be made up of vertical section and horizontal segment, the bottom that described vertical section comprises sidewall and closes, sidewall is connected with bottom, surround the hollow lumen of vertical direction upper top opening, sidewall above bottom is provided with a contralateral exposure, and two side holes is connected with hollow lumen, the wall of described side opening surrounding extends to horizontal direction, form described horizontal segment, it is characterized in that, the wall of described horizontal segment surrounds the tubular conduit identical with side opening shape, tubular conduit one end is connected with side opening, other end bottom is closed, top perforate, form semiclosed, the upper end wall of tubular conduit is provided with the thin-and-long opening identical with horizontal section length, and be connected with the perforate of semiclosed, form the final flow pass of molten steel, in order to ensure that the molten steel that submersed nozzle flows out is uniformly distributed in the both sides of plate slab crystallizer, therefore the geomery of horizontal segment that extends out of described side opening and side opening is identical, and vertical section center line axisymmetricly along the mouth of a river, described horizontal segment semiclosed both sides inwall upper surface is upwards outward-dipping inclined-plane from the inside to the outside, described horizontal segment upper end thin-and-long opening is positioned at the center of both sides, horizontal segment upper end inwall, thin-and-long opening is provided with along both sides and outward-dipping leads slope.
2. slab continuous casting submerged nozzle according to claim 1, is characterized in that, the lateral surface of described vertical section and horizontal segment connection is provided with reinforcing inclined-plane.
3. slab continuous casting submerged nozzle according to claim 1, is characterized in that, the cross section of described vertical section hollow lumen and sidewall is set to circle, and rectangle or the front-back of band chamfering are plane, and the left and right sides is the flat type of cambered surface.
4. slab continuous casting submerged nozzle according to claim 1, is characterized in that, described vertical section hollow lumen upper base surface is lower than edge under each side opening.
5. slab continuous casting submerged nozzle according to claim 1, is characterized in that, described vertical section is positioned on the sidewall on side opening top, loop overlapping shape slag line.
6. slab continuous casting submerged nozzle according to claim 1, is characterized in that, on described vertical section and horizontal segment, all walls all adopt refractory material isostatic compaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210242264.9A CN102794445B (en) | 2012-07-13 | 2012-07-13 | Slab continuous casting submersed nozzle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210242264.9A CN102794445B (en) | 2012-07-13 | 2012-07-13 | Slab continuous casting submersed nozzle |
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| CN102794445A CN102794445A (en) | 2012-11-28 |
| CN102794445B true CN102794445B (en) | 2014-12-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104942230A (en) * | 2015-06-23 | 2015-09-30 | 长兴县长安造型耐火材料厂 | Pipe for pouring |
| CN107470568A (en) * | 2017-07-24 | 2017-12-15 | 嘉善优联物流装备有限公司 | A kind of casting mold apparatus used in casting device |
| CN109465436B (en) * | 2018-11-12 | 2020-08-28 | 莱芜钢铁集团银山型钢有限公司 | Immersion type water gap for casting central point of ultrathin special-shaped blank |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48102219U (en) * | 1972-03-06 | 1973-11-30 | ||
| JPS548117A (en) * | 1977-06-21 | 1979-01-22 | Kawasaki Steel Co | Method of making continuously cast strip having little or no big debris |
| CN2192420Y (en) * | 1994-06-07 | 1995-03-22 | 河南省安阳钢铁公司 | Combined bale injection protection and molten steel guide device |
| CN201082465Y (en) * | 2007-08-28 | 2008-07-09 | 宝山钢铁股份有限公司 | Immersion water gap for continuous casting |
| CN202070756U (en) * | 2011-04-13 | 2011-12-14 | 张德程 | Aluminum liquid distributor and flow guide nozzle thereof |
| CN202910266U (en) * | 2012-07-13 | 2013-05-01 | 中冶南方工程技术有限公司 | Slab continuous casting submersed nozzle |
-
2012
- 2012-07-13 CN CN201210242264.9A patent/CN102794445B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48102219U (en) * | 1972-03-06 | 1973-11-30 | ||
| JPS548117A (en) * | 1977-06-21 | 1979-01-22 | Kawasaki Steel Co | Method of making continuously cast strip having little or no big debris |
| CN2192420Y (en) * | 1994-06-07 | 1995-03-22 | 河南省安阳钢铁公司 | Combined bale injection protection and molten steel guide device |
| CN201082465Y (en) * | 2007-08-28 | 2008-07-09 | 宝山钢铁股份有限公司 | Immersion water gap for continuous casting |
| CN202070756U (en) * | 2011-04-13 | 2011-12-14 | 张德程 | Aluminum liquid distributor and flow guide nozzle thereof |
| CN202910266U (en) * | 2012-07-13 | 2013-05-01 | 中冶南方工程技术有限公司 | Slab continuous casting submersed nozzle |
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| CN102794445A (en) | 2012-11-28 |
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Effective date of registration: 20151117 Address after: Huilong Town People's road 226299 in Qidong city in Jiangsu province Nantong City No. 526 Patentee after: Jiang Chao Address before: 430223 Hubei city of Wuhan province East Lake New Technology Development Zone, University Road No. 33 Patentee before: WISDRI Engineering & Research Incorporation Limited |