CN103231046A - Quasi-four-hole submersed nozzle for FTSC (flexible thin-slab casting) mold - Google Patents
Quasi-four-hole submersed nozzle for FTSC (flexible thin-slab casting) mold Download PDFInfo
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- CN103231046A CN103231046A CN2013101490304A CN201310149030A CN103231046A CN 103231046 A CN103231046 A CN 103231046A CN 2013101490304 A CN2013101490304 A CN 2013101490304A CN 201310149030 A CN201310149030 A CN 201310149030A CN 103231046 A CN103231046 A CN 103231046A
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Abstract
The invention relates to the field of metallurgical continuous casting equipment nozzles, in particular to a quasi-four-hole submersed nozzle for an FTSC (flexible thin-slab casting) mold. The quasi-four-hole submersed nozzle comprises an upper liquid steel inflow end, a middle flow channel and a lower outflow end which are sequentially connected, bilaterally symmetric discharge holes are arranged at the lower outflow end, and split-flow bodies are arranged between the discharge holes. The quasi-four-hole submersed nozzle is characterized in that middle flow guide bodies are arranged in the discharge holes, and four discharge channels are formed at the lower outflow end. Compared with the prior art, the quasi-four-hole submersed nozzle has the advantages that by the aid of lower flat structures of four basically downward discharge holes with proper opening, flow of liquid steel on the periphery of the nozzle is facilitated, a slab shell in solidification is prevented from being adhered with the nozzle, the structural sizes of a liquid steel inner channel and the outflow end of the nozzle are optimized in design, vortex core positions of two symmetric swiveling areas formed below the four discharge channels of two discharge openings, and floating nonmetal inclusions in the liquid steel can be absorbed and removed by covering slag.
Description
Technical field
The present invention relates to field, the metallurgical continuous casting equipment mouth of a river, relate in particular to a kind of FTSC crystallizer for continuous casting of thin slabs with accurate four cellular type submersed nozzles.
Background technology
The the Flexible Thin Slab Caster(FTSC of Italy Danieli Off Mecc exploitation) generally between 65～92mm, width is about 900～1650mm to the slab thickness of sheet blank continuous casting production.The FTSC thin-slab caster is different from conventional slab caster flat crystallizer commonly used, the crystallizer of FTSC thin-slab caster is similar with the CSP thin-slab caster, its wide copper coin all has the curved surface of being made up of continuous camber line transition, whole crystallizer is " funnel-form ", but " funnel " curve form size dimension difference of two kinds of crystallizers.Molten steel molten bath upper space increases in the funnel type crystallizer; make sheet blank continuous casting adopt submersed nozzle and continuous casting covering slag to become possibility; but funnel type crystallizer internal upper part space increase amplitude is limited; therefore thin-slab caster generally will be processed into flat pattern with the molten steel outflow end of submersed nozzle, and namely its size along the crystallizer width is wanted obviously greater than the size along thickness direction.
The molten steel that submersed nozzle is connected with tundish flows into end and is generally tubular, thereby connection inflow end and outflow end is the tubular conduit of a smooth continuous transition of cross sectional shape.
In order to prevent molten steel generation secondary oxidation in the continuous casting production process; need on the crystallizer molten steel bath surface, add the solid particle covering slag; it is contacted with high-temperature molten steel will absorb heat and melt; so just may make continuous casting covering slag play the protectant effect that prevents the molten steel secondary oxidation, the slag film that flows between solidified shell and the copper plate of crystallizer can play the reduction resistance of billet withdrawal and absorb the effects such as non-metallic inclusion of floating from molten steel.Because the quality of slag film has material impact to quality inside and outside continuous casting production direct motion and the strand between continuous casting covering slag melting conditions and feeding copper plate of crystallizer and the solidified shell, this can reasonably take high-temperature molten steel to crystallizer molten bath top with regard to requiring from the molten steel that submersed nozzle the forms stream that circles round in crystallizer, be beneficial to guarantee reasonable fusing and the feeding of continuous casting covering slag; Simultaneously, to prevent that also stream causes the fluctuating of bath surface and the excessive covering slag that makes that fluctuates is involved in solidified shell or molten steel because the molten steel that forms from submersed nozzle circles round in crystallizer, and then cause slab quality problem and production accident.Therefore, the overall structure of submersed nozzle (especially the internal flow channel sectional area changes and molten steel outflow end structure) just plays effect of crucial importance at this.
According to above-mentioned research and understanding to molten steel of melting bath motor behavior in the FTSC crystallizer for continuous casting of thin slabs, at present, produce the submersed nozzle flat mouths of a river of four perforates (referring to accompanying drawing 7, accompanying drawing 8) of adopting that FTSC thin-slab caster crystallizer is used both at home and abroad more.Four hole submersed nozzles shown in Figure 7 directly are transported to high-temperature molten steel mouth of a river bath surface on every side by two holes (7) that upwards spue, realized preferably moving on the molten steel of melting bath high-temperature region, but since on the hole molten steel jet that spues comparatively serious to the impact of crystallizer molten steel bath surface fluctuation, and molten steel of melting bath face high-temperature region also only concentrates on around the mouth of a river, makes whole molten steel surface temperature skewness.The mouth of a river, immersion hole, improved four hole that belongs to shown in Figure 8, the molten steel jet that the basic horizontal that relies on the hole that upwards spues (7) on top to form flows out has been suppressed circular flow in the crystallizer that the molten steel jet of the hole that spues (8) causes downwards, the molten steel of melting bath ground roll is moving to have certain amplitude to improve and make, but also caused simultaneously the non-metallic inclusion disadvantageous negative effect that floats, so be not suitable for the production of the demanding variety steel continuous casting of steel billet cleanliness factor.
Summary of the invention
The purpose of this invention is to provide a kind of crystallizer for continuous casting of thin slabs with accurate four cellular type submersed nozzles, be used for FTSC sheet blank continuous casting captain funnel type crystallizer, reduce fluctuating and the fluctuation of bath surface in the crystallizer, impel and move on the high-temperature region, molten steel molten bath in the crystallizer and molten steel surface temperature is evenly distributed, improve the uniformity of solidification of molten steel base shell, and the non-metallic inclusion come-up that is conducive in the molten steel is absorbed by continuous casting covering slag; Material structure intensity and the opposing high-temperature molten steel that can improve submersed nozzle bottom outflow end simultaneously wash away service life.
For solving the problems of the technologies described above, technical scheme of the present invention is:
The FTSC crystallizer for continuous casting of thin slabs is with accurate four cellular type submersed nozzles, the molten steel inflow end, middle part runner, the bottom outflow end that comprise top link to each other successively, the cross section of described middle part runner is more and more flat from the upper entrance to the lower part outlet, more and more wideer, described bottom outflow end is provided with the monosymmetric hole that spues, spue and be provided with the branch fluid between the hole, baffle in the middle of being provided with in the described hole that spues forms four tunnel passages that spue at the bottom outflow end.
Baffle is along the flow direction setting in the hole that spues in the middle of described, and its channelization angle δ is that 24～25 °, width c2 are that 15～16mm, length c3 are 86～87mm; The relative mouth of a river of baffle central axis is symmetrically distributed in the middle of two, and the upper end spacing c5 of two middle baffles is that 104～105mm, lower end spacing c4 are 150～152mm, and bottom, following end distance mouth of a river distance h 2 is 59～60mm.
The cross section of described middle part runner is continuous transition from the upper entrance to the lower part outlet, and the entrance section of middle part runner is tubular, and inner diameter d 1 is 78～80mm, and D outer diameter 1 is 130～132mm; The control cross section one of middle part runner is oblate tubular, and internal diameter major axis b2 is 192～193mm, and internal diameter minor axis d2 is 36～37mm, and external diameter major axis B2 is 250～252mm, and external diameter minor axis D2 is 92～94mm; The control cross section two of middle part runner is oblate tubular, and internal diameter major axis b3 is 216～217mm, and internal diameter minor axis d3 is 32～33mm, and external diameter major axis B3 is 276～278mm, and external diameter minor axis D3 is 87～89mm; The control cross section three of middle part runner oblate tubular for two muscle, internal diameter major axis b4 is 272～273mm, and internal diameter minor axis d4 is 28～29mm, and external diameter major axis B4 is 308～310mm, and external diameter minor axis D4 is 74～76mm; Entrance section is 400～422mm apart from the distance in control cross section one, and control cross section one is 78～80mm apart from the distance in control cross section two, and control cross section two is 133～135mm apart from the distance in control cross section three.
The angle of heel α in the described hole that spues is that 21～22 °, high h are that 133～135mm, wide d are 28～29mm.
The channelization angle β of described minute fluid is that 13～14 °, wide c1 are that 38～39mm, high h1 are 54～55mm.
Compared with prior art, the invention has the beneficial effects as follows:
1) adopted the bottom flattened type structure in four holes that spue of the downward substantially appropriate openings degree of direction, increased the distance between submersed nozzle outer wall and copper plate of crystallizer, be conducive to molten steel flow around the mouth of a river and prevent from solidifying in base shell and mouth of a river adhesion;
2) physical dimension of the molten steel internal channel at the mouth of a river and outflow end is through optimal design, the molten steel effluxvelocity that flows out from the working end discharge opening when making its work reduces, the center of vorticity position in the district of circling round of two symmetries that form below four paths of two discharge opening is particularly conducive to the protected slag absorption of the come-up of non-metallic inclusion removal in the molten steel than higher;
Have when 3) this mouth of a river produces strand below the section width 1350mm with 4.0～5.0m/min groundwork pulling rate in immersing 120～200mm degree of depth working range the moving amplitude of very little molten steel ground roll (± 2mm), be particularly conducive to the generation of avoiding molten steel face volume slag phenomenon in the crystallizer;
4) at 4.0～5.0m/min groundwork pulling rate and immerse and work in 120～200mm degree of depth working range when producing strand below the section width 1350mm, the molten steel temperature of bath surface is evenly distributed in the crystallizer, be particularly conducive to solidification of molten steel form around thickness nascent crystallization base shell uniformly, and then guarantee the surface quality of sheet billet.
5) baffle in the middle of this mouth of a river is provided with in outflow end, the material structure intensity and the opposing high-temperature molten steel that improve submersed nozzle bottom outflow end wash away service life.
Description of drawings
Fig. 1 is embodiment of the invention structural representation;
Fig. 2 is the upward view of Fig. 1;
Fig. 3 is along D-D line cutaway view among Fig. 1;
Fig. 4 is along E-E line cutaway view among Fig. 1;
Fig. 5 is along F-F line cutaway view among Fig. 1;
Fig. 6 is along G-G line cutaway view among Fig. 1;
Fig. 7 is the prior art mouth of a river one;
Fig. 8 is the prior art mouth of a river two.
Among the figure: the 1-molten steel flows into the end 2-middle part runner 3-bottom outflow end 4-hole 5-that spues and divides in the middle of the fluid 6-baffle 7-hole 8-hole that spues that upwards spues downwards
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further:
See Fig. 1, Fig. 2, be crystallizer for continuous casting of thin slabs of the present invention with accurate four cellular type submersed nozzle embodiment structural representations, comprise that top pipe shape molten steel flows into end 1, middle part runner 2, bottom outflow end 3 links to each other successively, the cross section of middle part runner 2 is more and more flat from the upper entrance to the lower part outlet, more and more wideer, bottom outflow end 3 is provided with the monosymmetric hole 4 that spues, spue and be provided with branch fluid 5 between the hole, spue be provided with in the hole 4 in the middle of baffle 6, be divided into four tunnel passages that spue at bottom outflow end 3, changed most four pore structures that adopt of present FTSC crystallizer for continuous casting of thin slabs, the stream that mainly circles round that the present invention can be formed in the FTSC crystallizer for continuous casting of thin slabs with two symmetries is more rational flow field of molten steel and the temperature field of feature.
Overall structure and size through the design of hydraulic model and computer simulation analysis optimization are as follows: the angle of heel α in the hole 4 that spues is that 21～22 °, high h are that 133～135mm, wide d are 28～29mm.The channelization angle β that divides fluid 5 is that 13～14 °, wide c1 are that 38～39mm, high h1 are 54～55mm.
Middle baffle 6 is along flow direction settings in the hole 4 that spues, and its channelization angle δ is that 24～25 °, width c2 are that 15～16mm, length c3 are 86～87mm; Baffle 6 relative mouth of a river central axis are symmetrically distributed in the middle of two, and the upper end spacing c5 of two middle baffles 6 is that 104～105mm, lower end spacing c4 are 150～152mm, and bottom, following end distance mouth of a river distance h 2 is 59～60mm.
See Fig. 3 to Fig. 6, the cross section of middle part runner 2 is continuous transition from the upper entrance to the lower part outlet, and the entrance section of middle part runner (D-D section) is tubular, and inner diameter d 1 is 78～80mm, and D outer diameter 1 is 130～132mm;
The control cross section one (E-E section) of middle part runner is oblate tubular, and internal diameter major axis b2 is 192～193mm, and internal diameter minor axis d2 is 36～37mm, and external diameter major axis B2 is 250～252mm, and external diameter minor axis D2 is 92～94mm;
The control cross section two (F-F section) of middle part runner is oblate tubular, and internal diameter major axis b3 is 216～217mm, and internal diameter minor axis d3 is 32～33mm, and external diameter major axis B3 is 276～278mm, and external diameter minor axis D3 is 87～89mm;
The control cross section three (G-G section) of middle part runner oblate tubular for two muscle, internal diameter major axis b4 is 272～273mm, and internal diameter minor axis d4 is 28～29mm, and external diameter major axis B4 is 308～310mm, and external diameter minor axis D4 is 74～76mm; Entrance section is 400～422mm apart from the distance in control cross section one, and control cross section one is 78～80mm apart from the distance in control cross section two, and control cross section two is 133～135mm apart from the distance in control cross section three.
Claims (5)
1.FTSC crystallizer for continuous casting of thin slabs is with accurate four cellular type submersed nozzles, the molten steel inflow end, middle part runner, the bottom outflow end that comprise top link to each other successively, the cross section of described middle part runner is more and more flat from the upper entrance to the lower part outlet, more and more wideer, described bottom outflow end is provided with the monosymmetric hole that spues, spue and be provided with the branch fluid between the hole, it is characterized in that baffle in the middle of being provided with in the described hole that spues is divided into four tunnel passages that spue at the bottom outflow end.
2. FTSC crystallizer for continuous casting of thin slabs according to claim 1 is with accurate four cellular type submersed nozzles, it is characterized in that, baffle is along the flow direction setting in the hole that spues in the middle of described, and its channelization angle δ is that 24～25 °, width c2 are that 15～16mm, length c3 are 86～87mm; The relative mouth of a river of baffle central axis is symmetrically distributed in the middle of two, and the upper end spacing c5 of two middle baffles is that 104～105mm, lower end spacing c4 are 150～152mm, and bottom, following end distance mouth of a river distance h 2 is 59～60mm.
3. FTSC crystallizer for continuous casting of thin slabs according to claim 1 and 2 is with accurate four cellular type submersed nozzles, it is characterized in that, the cross section of described middle part runner is continuous transition from the upper entrance to the lower part outlet, the entrance section of middle part runner is tubular, inner diameter d 1 is 78～80mm, and D outer diameter 1 is 130～132mm; The control cross section one of middle part runner is oblate tubular, and internal diameter major axis b2 is 192～193mm, and internal diameter minor axis d2 is 36～37mm, and external diameter major axis B2 is 250～252mm, and external diameter minor axis D2 is 92～94mm; The control cross section two of middle part runner is oblate tubular, and internal diameter major axis b3 is 216～217mm, and internal diameter minor axis d3 is 32～33mm, and external diameter major axis B3 is 276～278mm, and external diameter minor axis D3 is 87～89mm; The control cross section three of middle part runner oblate tubular for two muscle, internal diameter major axis b4 is 272～273mm, and internal diameter minor axis d4 is 28～29mm, and external diameter major axis B4 is 308～310mm, and external diameter minor axis D4 is 74～76mm; Entrance section is 400～422mm apart from the distance in control cross section one, and control cross section one is 78～80mm apart from the distance in control cross section two, and control cross section two is 133～135mm apart from the distance in control cross section three.
4. FTSC crystallizer for continuous casting of thin slabs according to claim 1 is characterized in that with accurate four cellular type submersed nozzles, and the angle of heel α in the described hole that spues is that 21～22 °, high h are that 133～135mm, wide d are 28～29mm.
5. FTSC crystallizer for continuous casting of thin slabs according to claim 1 is characterized in that with accurate four cellular type submersed nozzles, and the channelization angle β of described minute fluid is that 13～14 °, wide c1 are that 38～39mm, high h1 are 54～55mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101490304A CN103231046A (en) | 2013-04-25 | 2013-04-25 | Quasi-four-hole submersed nozzle for FTSC (flexible thin-slab casting) mold |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101490304A CN103231046A (en) | 2013-04-25 | 2013-04-25 | Quasi-four-hole submersed nozzle for FTSC (flexible thin-slab casting) mold |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014168A (en) * | 2018-09-14 | 2018-12-18 | 南京钢铁股份有限公司 | A kind of continuous casting manufacturing technique producing generous section pipe line steel slab |
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- 2013-04-25 CN CN2013101490304A patent/CN103231046A/en active Pending
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| US20060243760A1 (en) * | 2005-04-27 | 2006-11-02 | Mcintosh James L | Submerged entry nozzle |
| US20070241142A1 (en) * | 2005-04-27 | 2007-10-18 | Nucor Corporation | Submerged entry nozzle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109014168A (en) * | 2018-09-14 | 2018-12-18 | 南京钢铁股份有限公司 | A kind of continuous casting manufacturing technique producing generous section pipe line steel slab |
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Application publication date: 20130807 |