CN202910266U - Slab continuous casting submersed nozzle - Google Patents
Slab continuous casting submersed nozzle Download PDFInfo
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- CN202910266U CN202910266U CN 201220339229 CN201220339229U CN202910266U CN 202910266 U CN202910266 U CN 202910266U CN 201220339229 CN201220339229 CN 201220339229 CN 201220339229 U CN201220339229 U CN 201220339229U CN 202910266 U CN202910266 U CN 202910266U
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- continuous casting
- molten steel
- horizontal segment
- side opening
- slab continuous
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Abstract
The utility model relates to a slab continuous casting submersed nozzle which is composed of a vertical section and a horizontal section. A pair of side holes is arranged on an side wall above the bottom of the submersed nozzle, the two side holes are communicated with a hollow inner cavity, the wall surface around the side holes extends towards the horizontal direction to form the horizontal section, the wall surface of the horizontal section is encircled to form a tubular channel with the same shape as the side holes, one end of the tubular channel is connected with the side holes, a semi-sealed face is formed at the other end of the tubular channel, and an elongated opening which has the same length as the horizontal section is arranged on the wall surface at the upper end of the tubular channel. According to the technical scheme, a molten steel outflow channel is increased, molten steel can be fully spread to the cross section of a whole crystallizer, horizontal temperature and ingredient uniformity of the crystallizer can be guaranteed, the hot center of the poured high-temperature molten steel moves upwards, a reasonable temperature trapezoid is guaranteed, normal growth of casting blank and floating and removal of nonmetallic inclusions and bubbles are facilitated, blank casing remelting and damage are avoided, disturbance to the liquid level of the crystallizer caused by the molten steel is reduced, and continuous casting process smoothness and casting blank quality improvement are facilitated.
Description
Technical field
The utility model belongs to the continuous casting technical field of steel, more precisely, relates to a kind of slab continuous casting submerged nozzle.
Background technology
The continuous pouring of steel is the liquid molten steel that will have certain degree of superheat is cooled to the solid-state strand with definite shape continuously by water mold process, in this process, the sleeve pipe that need to have a refractory material to make injects molten steel in the crystallizer from the metallurgical tank of upstream, this refractory material sleeve pipe is called as submersed nozzle; Submersed nozzle upper end at right angle setting is in the bottom of upstream metallurgical tank, insert below the crystallizer molten steel surface lower end, its Main Function is the secondary oxidation that prevents molten steel, nitrogenize, splash, avoid simultaneously the liquid level slag, regulate flow pattern and the Temperature Distribution of Mold, thereby impel the even zero defect growth of base shell in the crystallizer, and reduce gas and non-metallic inclusion in the molten steel as far as possible, because submersed nozzle is for improving slab quality, improve working conditions, stabilizing continuous casting operates and prevents that from all there is significant effect the aspects such as casting billet surface and internal soundness defective, and therefore the conticaster in countries in the world is widely used.
Usually, want so that submersed nozzle can be brought into play its metallurgy action preferably, just necessary immersion type water nozzle structure shape reasonable in design, thereby obtain being adapted to reasonable crystallizer flow field and the temperature field of current pouring condition, generally speaking, reasonably crystallizer flow field and temperature field comprise 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 factors such as covering slag turnup and meniscus destruction, can guarantee again the normal fusing of covering slag simultaneously; (2) transversely uniformly temperature and component distributing of crystallizer its objective is the segregation that the lobe that prevents the excessive generation of horizontal thermal stress and uneven components produce; (3) crystallizer is vertically gone up rational thermograde; In order to promote the base shell to solidify preferably, in the thermal center (-tre) that guarantees to improve molten steel under above-mentioned two conditions as far as possible, make and form the low reasonable temperature gradient of the high temperature of lower of upper temp in the crystallizer, so both can improve Inner Quality of Billet as far as possible, can prevent again that crystallizer from exporting the base shell and crossing thin and bleed-out.
Under the prior art; continuous casting crystallizer for plate billet mainly adopts the cast of double-side-hole submersed nozzle; its agent structure is the pipeline that is sealed by the bottom that the refractory material compacting forms; the inner chamber and symmetrical two side openings that link to each other with inner chamber that comprise the vertical direction of upper shed; two side holes is aimed at leptoprosopy center, crystallizer both sides during cast; the molten steel of upstream metallurgical tank flows into from the inner chamber upper shed of submersed nozzle; from flowing out near two on the sidewall of bottom surface symmetrical side openings; and enter in the crystallizer; molten steel rebounds after side opening flows out bump crystallizer leptoprosopy; and formation cocycle stream and lower circular flow; cocycle stream forms impact to mold liquid level and covering slag, and lower circular flow is entered bottom the crystallizer.
The basic characteristics of mentioning rational crystallizer flow field and temperature field in conjunction with the front as can be known, when adopting existing double-side-hole submersed nozzle cast, usually can there be following three drawbacks: first, because high-temperature molten steel directly flows out from side opening after under the submersed nozzle inner chamber vertical current, lack necessary buffering, so the impact velocity of molten steel is very large, the nascent solidified shell of crystallizer leptoprosopy is damaged, also can cause the remelting of base shell, be unfavorable for the normal growth of base shell; Second; because molten steel is less from the effective area that mouth of a river side opening flows out; therefore molten steel stream thigh is more concentrated; larger near the local assault the mould at narrow, may cause near the meniscus of leptoprosopy larger liquid fluctuating or liquid level slag to occur, and can occur the dead band of molten steel flow near the liquid level position at the mouth of a river; molten steel temperature is lower; can occur the covering slag crust when serious, simultaneously, this steel liquid flow state also is unfavorable for crystallizer transverse temperature and written homogenising.The 3rd, because after molten steel impacts the crystallizer leptoprosopy, form up and down two backflows, in most cases, the circular flow of bottom molten steel is more, like this can be so that the crystallizer temperature of lower is higher, upper temp is on the low side, can not form in the vertical rational thermograde, worsen like this internal soundness of strand, be unfavorable for that simultaneously the come-up of field trash and bubble in the molten steel is removed.
Be in the utility model patent of CN201082465Y at notification number, a kind of immersion water gap for continuously casting is disclosed, 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 preferably water conservancy diversion and cushioning effect, but, because mouth of a river side opening extension has stoped the diffusion of molten steel, so that the stream thigh of mouth of a river outlet can be more concentrated the solidified shell of impact crystallizer leptoprosopy, destroyed the normal growth of leptoprosopy base shell, simultaneously, the uniformity that also is unfavorable for very much the horizontal molten steel temperature of crystallizer and composition, certainly, can not make molten steel keep in the vertical upper temp high, the Reasonable Mode that temperature of lower is low, therefore, this submersed nozzle can not effectively solve above-mentioned drawback.
The utility model content
The technical problems to be solved in the utility model is, for the above-mentioned deficiency of prior art 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 burst impact to leptoprosopy base shell of molten steel stream, increase temperature and the homogeneity of ingredients in crystallizer cross section, and the molten steel thermal center (-tre) is moved on as far as possible, promote the reasonable growth of base shell and the rapid come-up of field trash and bubble.
In order to achieve the above object, the technical solution of the utility model is achieved in that a kind of slab continuous casting submerged nozzle, form with horizontal segment by vertical section, described vertical section bottom that comprises sidewall and sealing, sidewall links to each other with the bottom, surround the hollow lumen of vertical direction upper top opening, be provided with a contralateral exposure near the sidewall above the bottom, two side holes is connected with hollow lumen; Wall around the described side opening extends to horizontal direction, form described horizontal segment, the wall of described horizontal segment surrounds the tubular conduit identical with the side opening shape, tubular conduit one end links to each other with side opening, the sealing of other end bottom, top perforate form semiclosed, and the upper end wall of tubular conduit is provided with the thin-and-long opening identical with horizontal section length, and link to each other with semiclosed perforate, form the final flow pass of molten steel.
In order to guarantee that the molten steel that submersed nozzle flows out evenly distributes in the both sides of plate slab crystallizer, therefore the geomery of the horizontal segment that extends out of described side opening and side opening is identical, and vertically the section center line is axisymmetricly along the mouth of a river.
Semiclosed both sides of described horizontal segment inwall upper surface for making progress outward-dipping inclined-plane, can make molten steel move upward from the inside to the outside so as far as possible, guarantees the high temperature of mold liquid level and the smooth come-up 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, on the thin-and-long opening, be provided with the outward-dipping slope of leading along both sides, so that elongated opening is the expansion inclination angle from inside to outside, form " eight " font, can make like this molten steel in the process that flows out, under the guide functions of leading the slope, be dispersed to very uniformly the cross section of crystallizer, be conducive to temperature and the homogenization of composition of molten steel.
Be provided with the reinforcing inclined-plane on the lateral surface of described vertical section and horizontal segment connection, guarantee that horizontal segment is more solid and reliable with being connected of vertical section, avoid horizontal segment under the impact of molten steel, to occur rupturing and coming off.
The cross section of described vertical section hollow lumen and sidewall is set to circle, is the plane with rectangle or the front-back of chamfering, 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 the hollow intracavity bottom forms pit, more effectively cushions the impact dynamics of molten steel.
On the described vertical section sidewall that is positioned at side opening top, slag line circlewise is arranged on the lateral surface of sidewall 11.
All walls all adopt the refractory material isostatic compaction on described vertical section and the horizontal segment.
Beneficial effect after the employing technique scheme is: a kind of slab continuous casting submerged nozzle compared with prior art has the following advantages by technical scheme:
(1) because the horizontal extension section of side opening upper end has the thin-and-long opening, be semiclosed away from the side opening end, the two has been linked to be the flow pass of molten steel, this molten steel flow pass is larger, and on wide of crystallizer, more disperse, molten steel is flowed out more uniformly, diffuse to more fully on the cross section of whole crystallizer, guaranteed temperature and homogeneity of ingredients that crystallizer is horizontal, be conducive to evenly solidifying of base shell.
(2) because the molten steel flow pass of side opening horizontal extension section is upwards pod apertures, therefore can make the as far as possible upwards operation of high-temperature molten steel of cast, move on the thermal center (-tre), guarantee that vertically upper rational temperature is trapezoidal, be conducive to the normal growth of strand and the raising of internal soundness, simultaneously, the come-up that is conducive to non-metallic inclusion and bubble is removed.
(3) because the horizontal extension section of side opening upper end has the thin-and-long opening, be semiclosed top incline away from the side opening end, can greatly reduce the flow that flows out from the side molten steel like this, alleviate molten steel to the nascent 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 prolong horizontal segment; can change like this flow direction of molten steel for twice; the impact kinetic energy of significant buffering and dissipation molten steel; reduce molten steel to the disturbance of mold liquid level; prevented excessive liquid fluctuating and covering slag turnup, be conducive to continuous casting process direct motion and slab quality and improve.
Description of drawings
Fig. 1 is the whole cutaway view of the utility model.
Fig. 2 is the side view cutaway drawing of Fig. 1.
Fig. 3 is that the A-A of Fig. 1 is to cutaway view.
Fig. 4 is that the B-B of Fig. 1 is to cutaway view.
Fig. 5 is that the C-C of Fig. 1 is to cutaway view.
Fig. 6 is that the D-D of Fig. 1 is to cutaway view.
Fig. 7 is that submersed nozzle is arranged in the interior forward cutaway view of plate slab crystallizer among the embodiment of the present utility model.
Fig. 8 is that submersed nozzle is arranged in the interior E-E cutaway view of plate slab crystallizer among the embodiment of the present utility model.
Attached number in the figure is as follows, and 1 vertical section, 11 sidewalls, 12 bottoms, 13 slag lines, 14 hollow lumen, 2 horizontal segments, 21 walls, 22 tubular conduits, 23, semiclosed, 24 second side openings, 25 thin-and-long openings, 26 are reinforced inclined-planes, 3-plate slab crystallizer.
The specific embodiment
Below in conjunction with specific embodiment of the utility model and Figure of description 1-8 the technical solution of the utility model is described further.
Such as Fig. 1～shown in Figure 6, the slab continuous casting submerged nozzle that the utility model relates to, formed by vertical section 1 and horizontal segment 2, described vertical section 1 bottom 12 that comprises sidewall 11 and sealing, be provided with circlewise slag line 13 at the lateral surface of sidewall 11, the degree of depth of described slag line 13 is 10～25mm, highly is 100～160mm, and slag line 13 lower ends are dried up, and mouthful bottom 12 a lower surfaces distance is 60～120mm; Described sidewall 11 links to each other with bottom 12, and surrounds the hollow lumen 14 of top end opening on the vertical direction, and the shape of cross section of described sidewall 11 and hollow lumen 4 can be circle, with the square or front and back of chamfering be the plane, about be the flat type of cambered surface.
Be provided with two side openings 15 that size shape is identical on the described sidewall 11, two side holes 15 and is interconnected with hollow lumen 14 along the center line of hollow lumen 14 axisymmetricly.Described side opening 15 can be set to ellipse, with the rectangle of chamfering, circular or about be semicircle, middlely be square assembly, the distance of 15 times edges of described side opening, upper surface of 12 to the bottom is 10-40mm, 12 with respect to side opening 15 formation pits bottom making.
Wall around the described side opening 15 stretches out, form horizontal segment 2, extending level section 2 size shape of described two side holes 15 are also identical, and the center line of edge vertical section 1 inner chamber 15 axisymmetricly, being symmetrical arranged of described side opening 15 and horizontal segment 2 is fully necessary, can guarantee like this in the mouth of a river go out that stream can be symmetrically and evenly minute to both sides, the mouth of a river, to guarantee the harmony in whole flow field and temperature field.
Described horizontal segment 2 comprises wall 21 and semiclosed 23, wall 21 surrounds the tubular conduit 22 of hollow, tubular conduit 22 shape sizes are identical with side opening 15, the one end links to each other with side opening 15, form a bottom horizontal flow sheet passage, the other end is semiclosed 23, semiclosed 23 upper surface is inclined upwardly from inside to outside, the inclination angle scope is 15 °～60 °, semiclosed 23 top has the second side opening 24, and semiclosed 23 and the 24 sectional area additions of the second side opening are the sectional area of tubular conduit 22, and center, described wall 21 upper end has thin-and-long opening 25, thin-and-long opening 25 length are identical with horizontal segment 2 length, run through whole horizontal segment 2.Described thin-and-long opening 25 cross sections are lower little up and down trapezoidal, and namely the opening wall be the angle of flare from inside to outside, formation " eight " font, and the angular range of the angle of flare and vertical curve is 10 °～50 °; Described thin-and-long opening 25 links to each other 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 21 left and right sides lateral surfaces are mutually concordant with sidewall 11 corresponding two lateral surfaces, wall 21 is provided with reinforcing inclined-plane 26 near the up and down outside wall surface of sidewall 11, reinforce inclined-plane 26 upper surfaces and be the inclined plane, and fill with solid refractory material between sidewall 21 and the sidewall 11, to reach the purpose of reinforcing horizontal segment 2 and the section of being connected 1 connection, described submersed nozzle adopts refractory material to pass through isostatic compaction, wall interconnects becomes an integral body, this process is the common process that submersed nozzle is made in the actual production, so launch no longer in detail narration.
Such as Fig. 7, shown in Figure 8, in actual molten steel casting process, the horizontal segment 2 of submersed nozzle inserts below crystallizers 3 liquid levels, molten steel from submersed nozzle vertically the suitable for reading of inner chamber 14 of section 1 enter, at action of gravitation downstream to bottom 12, cushioning effect through bottom 12, flow into horizontal segment 2 from side opening 15, at this moment, a part of molten steel flows to the second side opening 24 places along the tubular conduit 22 of horizontal segment 2, and from the second side opening 24, flow in the crystallizer 3, flow toward the liquid level zone in crystallizer 3 bights; Another part molten steel flows in the crystallizer 3 along the thin-and-long opening 25 of tubular conduit 22 tops, flows towards the liquid level zone of crystallizer 3 middle parts.Molten steel is vertically flowing downward and is making progress mobile direction as shown by the arrows in Figure 7 in the section 1 in horizontal segment 2.
Molten steel flow mode in the utility model can significantly reduce the mobile kinetic energy of molten steel, reduce the impact of molten steel, guarantee the even distribution of molten steel temperature and composition on cross section, impel on the molten steel thermal center (-tre) and move, the come-up that is conducive to field trash and bubble, the reasonable growth of solidified shell and the raising of slab quality provide assurance in order to come into being.
The above only is better possible embodiments of the present utility model, is not to limit scope of the present utility model.
Claims (9)
1. slab continuous casting submerged nozzle, form with horizontal segment by vertical section, described vertical section bottom that comprises sidewall and sealing, sidewall links to each other with the bottom, surround the hollow lumen of vertical direction upper top opening, be provided with a contralateral exposure near the sidewall above the bottom, two side holes is connected with hollow lumen; Wall around the described side opening 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 the side opening shape, and tubular conduit one end links to each other with side opening, the sealing of other end bottom, 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 links to each other with semiclosed perforate, forms the final flow pass of molten steel.
2. slab continuous casting submerged nozzle according to claim 1, it is characterized in that, in order to guarantee that the molten steel that submersed nozzle flows out evenly distributes in the both sides of plate slab crystallizer, therefore the geomery of the horizontal segment that extends out of described side opening and side opening is identical, and vertically the section center line is axisymmetricly along the mouth of a river.
3. slab continuous casting submerged nozzle according to claim 1 is characterized in that, semiclosed both sides of described horizontal segment inwall upper surface is from the inside to the outside for making progress outward-dipping inclined-plane.
4. slab continuous casting submerged nozzle according to claim 1 is characterized in that, described horizontal segment upper end thin-and-long opening is positioned at the center of both sides, horizontal segment upper end inwall, is provided with the outward-dipping slope of leading on the thin-and-long opening along both sides.
5. slab continuous casting submerged nozzle according to claim 1 is characterized in that, is provided with the reinforcing inclined-plane on the lateral surface of described vertical section and horizontal segment connection.
6. 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, is the plane with rectangle or the front-back of chamfering, and the left and right sides is the flat type of cambered surface.
7. 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.
8. slab continuous casting submerged nozzle according to claim 1 is characterized in that, on the described vertical section sidewall that is positioned at side opening top, slag line circlewise is arranged on the lateral surface of sidewall.
9. slab continuous casting submerged nozzle according to claim 1 is characterized in that, all walls all adopt the refractory material isostatic compaction on described vertical section and the horizontal segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220339229 CN202910266U (en) | 2012-07-13 | 2012-07-13 | Slab continuous casting submersed nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220339229 CN202910266U (en) | 2012-07-13 | 2012-07-13 | Slab continuous casting submersed nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202910266U true CN202910266U (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220339229 Expired - Fee Related CN202910266U (en) | 2012-07-13 | 2012-07-13 | Slab continuous casting submersed nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202910266U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794445A (en) * | 2012-07-13 | 2012-11-28 | 中冶南方工程技术有限公司 | Slab continuous casting submersed nozzle |
| CN110511870A (en) * | 2019-08-30 | 2019-11-29 | 英诺维尔智能科技（苏州）有限公司 | A kind of biological products large-scale production is without impact liquid sedimentation conduit |
-
2012
- 2012-07-13 CN CN 201220339229 patent/CN202910266U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794445A (en) * | 2012-07-13 | 2012-11-28 | 中冶南方工程技术有限公司 | Slab continuous casting submersed nozzle |
| CN102794445B (en) * | 2012-07-13 | 2014-12-17 | 中冶南方工程技术有限公司 | Slab continuous casting submersed nozzle |
| CN110511870A (en) * | 2019-08-30 | 2019-11-29 | 英诺维尔智能科技（苏州）有限公司 | A kind of biological products large-scale production is without impact liquid sedimentation conduit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20150713 |
|
| EXPY | Termination of patent right or utility model |