CN1191137C - Method and device for slab continuous casting using two pouring openings - Google Patents
Method and device for slab continuous casting using two pouring openings Download PDFInfo
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- CN1191137C CN1191137C CNB02111188XA CN02111188A CN1191137C CN 1191137 C CN1191137 C CN 1191137C CN B02111188X A CNB02111188X A CN B02111188XA CN 02111188 A CN02111188 A CN 02111188A CN 1191137 C CN1191137 C CN 1191137C
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- crystallizer
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- river
- tundish
- filling pipe
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Abstract
The present invention relates to a method and a device for slab blank continuous casting by two pouring openings. Two immersed type pouring openings are inserted into a slab blank continuous casting crystallizer to pour, and the upper parts of immersed type pouring openings are respectively connected with an upper pouring opening in a bakie. Two independent pouring and flowing channels are formed between the bakie and the crystallizer. The pouring flow quantity on each upper pouring opening is controlled respectively by a stopper bar so that the control of the liquid level of the crystallizer is realized. The present invention can realize the operation for replacing the stopper bar of the bakie under the condition of keeping the control of the liquid level, can close one of the pouring openings under the condition of no cutoff in the crystallizer and replace the pouring openings. Accordingly, continuous casting time can be greatly enhanced, and the present invention is good for improving the flow field distribution and the temperature distribution of molten steel in the crystallizer. The present invention is particularly suitable for the continuous cast of a special broad slab blank and the continuous cast of a thin slab.
Description
Technical field
The present invention relates to the continuous casting steel machine technology, particularly the sheet billet continuous casting technology.
Background technology
In the prior art, sheet billet continuous casting all adopts the single mouth of a river to pour into a mould, and promptly has only a submersed nozzle to insert in the crystallizer.For molten steel in mold flow field and temperature field are tending towards rationally, submersed nozzle has side opening usually, with molten steel guide sides crystallizer width.Along with width of plate slab increases, the temperature difference of limit portion molten steel and central area molten steel also will increase, thereby cause the tendency of strand generation quality of edges problem to increase, the possibility that bonding steel leakage takes place in the steel pouring process also increases thereupon, therefore adopt single mouth of a river be not suitable for the casting slab such as the slab of width more than 2000mm of extra wide, this is more outstanding under big flakiness ratio situation, as when pouring into a mould wide sheet billet.
For the slab caster of single immersed nozzle, if adopt stopper to carry out beam control, then can't in casting process, safety change stopper, promptly the time of watering of watering time is the upper limit with the service life of stopper also; If adopt the slide plate mode to carry out beam control, then existing glide mouth of a river mechanism can't realize the online replacing of slide plate, and promptly connecting the time of watering is the upper limit with the service life of slide plate just.
In addition, as the passage of molten steel from the tundish to the crystallizer, submersed nozzle can melting loss and obstruction in casting process, usually is lower than the service life of other refractory materials of tundish its service life, waters the time for prolonging to connect, and need carry out submersed nozzle and change operation.For the consideration that reduces production accident and assurance slab quality, do not wish to close beam when changing the mouth of a river usually and open wide cast.Propose a lot of devices and realized this operation, disclosed as European patent EP 192019 and Chinese patent 99223889 and 00242979, usually in the submersed nozzle upper end one flat board is housed, and a guide groove arranged, guide groove is put at the new mouth of a river and the former mouth of a river is arranged side by side, by an application of force utensil new mouth of a river moment is pushed working position, the former mouth of a river is then short by compole when changing simultaneously, can not close beam.Because of not raising tundish, need in advance the new mouth of a river to be immersed in the crystallizer molten steel before changing, and the former mouth of a river also still is immersed in the molten steel when breaking away from working position.Therefore these class methods need have enough positions to comprise that at least preparation position, the new mouth of a river, working position, the former mouth of a river break away from the position in crystallizer, in fact also need the extension at the new mouth of a river to go into the removal position at the position and the old mouth of a river, less or submersed nozzle is difficult to realization during greatly as the situation of sheet blank continuous casting along the plate width direction size at width of plate slab for this.In addition, because the new mouth of a river and the old mouth of a river are stressed very big when switching, also might cause the mechanical damage at the mouth of a river.
Summary of the invention
The object of the present invention is to provide a kind of method and device, the temperature non that exists when solving single mouth of a river cast extra wide slab or having big flakiness ratio slab; And be implemented in safety replacing stopper in the casting process, and under the situation that is not related to stream, unlimited cast, change submersed nozzle easily, thus the time is watered by the company of improving tundish; Simultaneously, improve crystallizer interior temperature homogeneity and level fluctuation situation to a certain extent.
For achieving the above object, technical solution of the present invention is:
Adopt the method for two mouth of a river sheet billet continuous castings, inserting two submersed nozzles in a continuous casting crystallizer for plate billet pours into a mould, each submersed nozzle top links to each other with a filling pipe end in the tundish respectively, has formed two independently beam passages between tundish and crystallizer; Above each filling pipe end, carry out the beam flow-control and realize crystallizer liquid level control system with a stopper respectively with this; Can carry out the online replacing of stopper in the casting process.
When carrying out crystallizer liquid level control system, make one of them beam passage exercise flow dynamics regulatory function and other beam passages keep flows constant, to improve the mechanical precision of liquid level control.
A kind of device that is used to adopt the method for two mouth of a river sheet billet continuous castings provided by the invention comprises tundish, submersed nozzle and crystallizer; Be provided with at least two filling pipe ends and corresponding stopper in the described tundish; Also be provided with at least two submersed nozzles, described submersed nozzle and link to each other with filling pipe end in the tundish, submersed nozzle is inserted in the crystallizer.Mouth links to each other, and submersed nozzle is inserted in the crystallizer.
Further, the middle apron weir is set between the filling pipe end in tundish, to reduce the Yu Gangliang in the last tundish of cast and to prevent near influencing each other of two flow fields the filling pipe end.
The centre-to-centre spacing of two filling pipe ends is fixed value, and when width of plate slab during at 1200mm～2000mm, centre-to-centre spacing is 500mm～700mm; Wide during at 2000mm～3200mm when plate, centre-to-centre spacing is 700mm～1200mm; Make slab caster all may be cast in the slab that changes in the certain width scope, the centre-to-centre spacing at two mouths of a river does not change with the wide variation of plate, is fixed value, has guaranteed when plate is wide when adjusting the within the specific limits same tundish of employing.
Further, for adapting to the wide variation of plate, described submersed nozzle bottom is provided with the expansion stem bar, and described expansion stem bar is asymmetrical flat structure, and its sidepiece extends to lopsidedness along plate is wide; Wide when big when plate, expand stem bar and extend to the narrow sidewall direction of crystallizer (outside, two mouths of a river); Wide hour when plate, expand stem bar and extend to the inside.
For making things convenient for the online replacing of submersed nozzle, on the plate slab crystallizer width, the Edge Distance of the tundish base plane that the center at each mouth of a river is nearest with it should reduce to be no more than 250mm as far as possible.
Above each filling pipe end, all carry out the beam flow-control and realize crystallizer liquid level control system with this with a stopper; Can carry out the online replacing of stopper in the casting process.Promptly remove wherein stopper, and the new stopper of packing in situ; In the stopper replacing process, because the another stopper is still in running order, so mould liquid level also is in state of a control.Therefore, aforesaid operations has realized can keeping in casting process flow-control can change the function of stopper again.
Owing between tundish and crystallizer, formed two independently beam passages, can not need in the casting process to carry out the online replacing of submersed nozzle by the more changing device of other complexity.The beam that is about to need to change the mouth of a river is closed, and changes a new mouth of a river behind this mouth of a river of removal.Because other mouths of a river are still in running order, so aforesaid operations has realized neither opening wide cast and the function at the replacing mouth of a river under the prerequisite that continues to flow again in the crystallizer.
Owing between tundish and crystallizer, formed two independently beam passages, when carrying out crystallizer liquid level control system, both can adopt Synchronization Control, also can make one of them beam passage exercise flow dynamics regulatory function and another beam passage keeps flow constant, this kind mode is compared with the situation that adopts the cast of single mouth of a river, if stopper mobile phase distance together, then the total flow of the former generation changes less, therefore can improve the mechanical precision of liquid level control to a certain extent.
Advantage of the present invention is:
1. be specially adapted to extra wide sheet billet continuous casting and sheet blank continuous casting.
2. can be implemented in the function of safety replacing tundish stopper in the casting process; Can be not by other complexity changing device and be implemented in and neither open wide cast more, and change the function at the mouth of a river under the prerequisite that continues to flow again in the crystallizer.To increase substantially tundish on this basis even waters the time.
3. by shunting, make the unit interval steel-passing amount at a mouth of a river reduce, go out the optimal design in stream and crystallizer flow field on this basis, can effectively improve the level fluctuation situation in the crystallizer for continuous casting of thin slabs, help to improve the Flow Field Distribution and the temperature distribution evenness of crystallizer inner metal liquid body, particularly alleviate level fluctuation and improve the fusion situation of covering slag and the thermal stress distribution situation of base shell; Simultaneously, by being convenient for changing of shunting and realization submersed nozzle, can reduce the external diameter of submersed nozzle, this has the meaning of particular importance to sheet blank continuous casting.
4. help to improve the crystallizer liquid level control system precision.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is for expanding a kind of structural representation of stem bar among the present invention.
Fig. 3 is for expanding the another kind of structural representation of stem bar among the present invention.
The specific embodiment
As shown in Figure 1, method of the present invention is: insert two submersed nozzles 7,8 and pour into a mould in a continuous casting crystallizer for plate billet 1, each submersed nozzle 7,8 top links to each other with a filling pipe end 5,6 in the tundish 2 respectively, has formed two independently beam passages between tundish 2 and crystallizer 1; Above each filling pipe end 5,6, all carry out the beam flow-control and realize crystallizer liquid level control system with this with a stopper 3,4.
Device of the present invention comprises tundish 2, submersed nozzle 7,8 and crystallizer 1; Be provided with two filling pipe ends 5,6 and corresponding stopper 3,4 in the described tundish 2; Also be provided with two submersed nozzles 7,8, described submersed nozzle 7,8 and link to each other with filling pipe end 5,6 in the tundish 2, submersed nozzle 7,8 is inserted in the crystallizer 1; In tundish 2, between the filling pipe end 5,6 middle apron weir 9 is set.
The centre-to-centre spacing of two filling pipe ends 5,6 is fixed value, and when width of plate slab during at 1200mm～2000mm, centre-to-centre spacing is 500mm～700mm; Wide during at 2000mm～3200mm when plate, centre-to-centre spacing is 700mm～1200mm.Therefore, can adopt same tundish when plate is wide when adjusting within the specific limits.For adapting to the wide variation of plate, comprise also that in the submersed nozzle bottom flat with unsymmetric form expands stem bar.Wide when big when plate, expand stem bar and extend to the narrow sidewall direction of crystallizer (outside, the mouth of a river); Wide hour when plate, expand stem bar and extend to the inside.
The present invention can carry out the safety on line of stopper and change in casting process, owing to all carry out the beam flow-control and realize the control of crystallizer 1 liquid level with this with a stopper 3,4 above each filling pipe end 5,6.Can remove wherein stopper, and the new stopper of packing in situ.In the stopper replacing process, because the another stopper is still in running order, so crystallizer 1 liquid level also is in state of a control.Obviously, the present invention has provided and has realized the method that stopper safety is changed, though the beam of the stopper of promptly changing is uncontrollable, other stoppers still carry out normal beam control, and can realize crystallizer liquid level control system equally.
Owing between tundish and crystallizer, formed two independently beam passages, can be not in the casting process do not carry out submersed nozzle and change by the more changing device of other complexity.Promptly close one of them submersed nozzle earlier,, change and open beam behind the new mouth of a river again and continue cast subsequently with this submersed nozzle removal.In whole replacing process, other streams guarantee to continue to flow in the crystallizer 1 still in cast, and the stage of the cast of opening wide is not arranged certainly yet.
Equally, owing between tundish 2 and crystallizer 1, formed two independently beam passages, when carrying out crystallizer liquid level control system, both can adopt Synchronization Control, also can make one of them beam passage exercise flow dynamics regulatory function and another beam passage keeps flow constant, this kind mode is compared with the situation that adopts the cast of single mouth of a river, if stopper mobile phase distance together, then the total flow of the former generation changes less, therefore can improve the mechanical precision of liquid level control to a certain extent.
Owing between tundish 2 and crystallizer 1, formed two beam passages, when carrying out sheet blank continuous casting, because of the molten steel that enters crystallizer 1 is shunted, make the unit interval steel-passing amount at a mouth of a river reduce, go out the optimal design of stream and crystallizer 1 flow field on this basis, can effectively improve the level fluctuation situation in the crystallizer for continuous casting of thin slabs.In addition, because of the unit interval steel-passing amount reduction at a mouth of a river, then its internal diameter can reduce; Simultaneously, because of conveniently replaced submersed nozzle, but its wall thickness attenuate (promptly needn't increase its wall thickness) then for the service life of improving submersed nozzle, so the external diameter of submersed nozzle is reduced, this has the meaning of particular importance for sheet blank continuous casting.
In addition, for extra wide slab such as the above continuous casting of 2000mm, or when having big flakiness ratio such as sheet blank continuous casting, adopt device provided by the invention, can reduce the temperature difference of limit portion molten steel and central area molten steel, thereby reduce the tendency of strand generation quality of edges problem even generation bonding steel leakage.
In sum, the present invention is specially adapted to extra wide sheet billet continuous casting and sheet blank continuous casting.Can be implemented in the function of safety replacing tundish stopper in the casting process, and neither open wide cast, and change the function at the mouth of a river under the prerequisite that continues to flow again in the crystallizer.To increase substantially tundish on this basis even waters the time.Simultaneously; by shunting; make the unit interval steel-passing amount at a mouth of a river reduce; and the external diameter of submersed nozzle is reduced; go out the optimal design of stream on this basis; can effectively improve the level fluctuation situation in the crystallizer for continuous casting of thin slabs, help to improve the Flow Field Distribution and the temperature distribution evenness of crystallizer inner metal liquid body, particularly alleviate level fluctuation and improve the fusion situation of covering slag and the thermal stress distribution situation of base shell.In addition, help to improve the crystallizer liquid level control system precision.
Claims (6)
1. adopt two mouths of a river to carry out the method for sheet billet continuous casting, it is characterized in that: in a continuous casting crystallizer for plate billet, insert two submersed nozzles and pour into a mould, each submersed nozzle top links to each other with a filling pipe end in the tundish respectively, has formed two independently beam passages between tundish and crystallizer; Above each filling pipe end, carry out the beam flow-control and realize crystallizer liquid level control system with a stopper respectively with this.
2. the method for sheet billet continuous casting is carried out at two mouths of a river of employing as claimed in claim 1, it is characterized in that: when carrying out crystallizer liquid level control system, make one of them beam passage exercise flow dynamics regulatory function and other beam passages keep flows constant, to improve the mechanical precision of liquid level control.
3. one kind is used for the device that the method for sheet billet continuous casting is carried out at two mouths of a river of the described employing of claim 1, comprises tundish, submersed nozzle and crystallizer; It is characterized in that: be provided with at least two filling pipe ends and corresponding two stoppers in the described tundish; Also be provided with at least two submersed nozzles, described submersed nozzle and link to each other with filling pipe end in the tundish, submersed nozzle is inserted in the crystallizer.
4. the device of the method for sheet billet continuous casting is carried out at two mouths of a river of employing as claimed in claim 3, it is characterized in that: the middle apron weir is set between the filling pipe end in tundish.
5. carry out the device of the method for sheet billet continuous casting as claim 3 or two mouths of a river of 4 described employings, it is characterized in that: the centre-to-centre spacing of two filling pipe ends is fixed value, and when width of plate slab during at 1200mm～2000mm, centre-to-centre spacing is 500mm～700mm; Wide during at 2000mm～3200mm when plate, centre-to-centre spacing is 700mm～1200mm.
6. carry out the device of the method for sheet billet continuous casting as claim 3 or two mouths of a river of 4 described employings, it is characterized in that: described submersed nozzle bottom is provided with the expansion stem bar, described expansion stem bar is asymmetrical flat structure, and its sidepiece extends to lopsidedness along plate is wide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02111188XA CN1191137C (en) | 2002-03-28 | 2002-03-28 | Method and device for slab continuous casting using two pouring openings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02111188XA CN1191137C (en) | 2002-03-28 | 2002-03-28 | Method and device for slab continuous casting using two pouring openings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1448234A CN1448234A (en) | 2003-10-15 |
| CN1191137C true CN1191137C (en) | 2005-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB02111188XA Expired - Fee Related CN1191137C (en) | 2002-03-28 | 2002-03-28 | Method and device for slab continuous casting using two pouring openings |
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| CN (1) | CN1191137C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1986115B (en) * | 2005-12-22 | 2012-04-11 | 马鞍山钢铁股份有限公司 | Fast sprue-replacing casting method and device for continuous irregular blank casting ladle |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102310170A (en) * | 2011-03-09 | 2012-01-11 | 维苏威高级陶瓷(苏州)有限公司 | Emergency quick-change device for long nozzle of steel ladle |
| US9375785B2 (en) * | 2011-06-26 | 2016-06-28 | Inductotherm Corp. | Molten metal holding and pouring box with dual pouring nozzles |
| CN102319885A (en) * | 2011-09-28 | 2012-01-18 | 中冶南方工程技术有限公司 | Continuous casting method and device for double-nozzle cast ultra-thick plate blank |
| CN103042204B (en) * | 2013-01-23 | 2014-12-10 | 辽宁福鞍重工股份有限公司 | Rapid pouring method for double-gate ladle |
| CN112548055A (en) * | 2020-12-11 | 2021-03-26 | 西南铝业（集团）有限责任公司 | Device and method for semi-continuous casting of ultra-wide aluminum alloy slab ingot |
-
2002
- 2002-03-28 CN CNB02111188XA patent/CN1191137C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1986115B (en) * | 2005-12-22 | 2012-04-11 | 马鞍山钢铁股份有限公司 | Fast sprue-replacing casting method and device for continuous irregular blank casting ladle |
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| Publication number | Publication date |
|---|---|
| CN1448234A (en) | 2003-10-15 |
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