CN102274961A - Submersed nozzles for shaped blank continuous casting crystallizer - Google Patents
Submersed nozzles for shaped blank continuous casting crystallizer Download PDFInfo
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- CN102274961A CN102274961A CN2011102541639A CN201110254163A CN102274961A CN 102274961 A CN102274961 A CN 102274961A CN 2011102541639 A CN2011102541639 A CN 2011102541639A CN 201110254163 A CN201110254163 A CN 201110254163A CN 102274961 A CN102274961 A CN 102274961A
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- river
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Abstract
The invention relates to submersed nozzles for a shaped blank continuous casting crystallizer. The submersed nozzles comprise an annular side wall, a closed bottom which encloses an inner cavity or a central hole with the side wall and water holes formed on the side wall, wherein the upper part of each nozzle is open; and the upper end of each nozzle is a funnel-shaped annular body, and the lower end of each nozzle is a cylindrical annular body. The nozzles are characterized in that: three water holes are formed on the side wall of the cylindrical annular body which is closed to the bottom and are communicated with the inner cavity; upper and lower wall surfaces of the three water holes incline upwards or downwards simultaneously from the inside to the outside of the side wall; and during pouring, the two nozzles are formed in a triangular area of a shaped blank symmetrically, two symmetrical side holes of the nozzles align with two ends of a flange, and a third hole aligns with the center of a webplate. Because the submersed nozzles and an arrangement mode are adopted, the impact force of molten steel can be immersed obviously, a hot center of the molten liquid is improved, the temperature of the cross section of the crystallizer and the uniformity of ingredients are promoted, and the ascending of impurities is facilitated to remove and reduce quality defects such as cracks, segregation and the like of casting blanks.
Description
Technical field
The invention belongs to continuous-casting of steel billet crystallizer submersed nozzle device, relate generally to special-shaped billet crystallizer submersed nozzle device.
Background technology
Continuous casting steel machine is the process that the liquid molten steel after smelting is cooled to continuously the solid-state strand with definite shape by the copper crystallizer of water-cooled.In this process, the molten steel that adopts the submersed nozzle device that is prepared by refractory material will go up station (tundish) continuously is delivered in the crystallizer usually.Submersed nozzle can come molten steel and air are isolated, prevents secondary oxidation of steel, guarantees the molten steel degree of purity; Simultaneously, by designing suitable submersed nozzle physical dimension, can also obtain rationally, stable, crystallizer flow field uniformly, with the rapid come-up of field trash in the normal growth that guarantees initial solidification shell and the molten steel.
Special-shaped base is compared with conventional strand (square billet, slab and circle base), the cast section configuration is more complicated, its crystallizer internal cavity cross section is " H " shape, have a plurality of " turnings " and " edge ", mobile and the heat radiation at variant position differs greatly, obtain special-shaped preferably billet crystallizer flow field, just need propose higher requirement special-shaped base submersed nozzle physical dimension design.
From cross section, special-shaped base can be divided into the symmetrically arranged edge of a wing of a web and the web left and right sides totally three parts simply, and web is meant special-shaped base neutral straight district, and is identical with the slab shape, web each side be an edge of a wing, each edge of a wing all starts from the camber line place that links to each other with web.Under the conventional art, the submersed nozzle and the pouring type of special-shaped base mainly contain three kinds: the first adopts two through-type semi-submersible mouths of a river to carry out the semi-open-type cast, two mouths of a river are installed on the crossing trigonum of the crystallizer web and the edge of a wing, insert in the crystallizer lower end, the mouth of a river, upper end, the mouth of a river is funnel-form, with the tundish bottom surface certain distance is arranged.This mode can reduce the impact of beam, but can not realize the full guard cast of molten steel, causes the part molten steel oxidized and reduce the molten steel cleanliness factor, is eliminated gradually.Another kind of mode has been done improvement on this basis, and upper end, the mouth of a river is linked to each other with the tundish bottom, promptly adopts two through-type submersed nozzles to pour into a mould in the crossing trigonum of the web and the edge of a wing, has realized the full guard cast.Yet, the stream thigh impact depth at the through-type mouth of a river is bigger, the molten steel thermal center (-tre) moves down, be unfavorable for the effective come-up of field trash and the growth of initial solidification shell, and, the molten steel that flow out at the through-type mouth of a river mainly concentrates on the trigonum, and transversely temperature, component difference are bigger to make whole special-shaped base, cause the generation of mass defects such as crackle and segregation easily.The third mode is to adopt single immersed nozzle to pour into a mould in the trigonum of special-shaped base section one side, this can make that the flow field and the temperature field of the interior molten steel of crystallizer are extremely unreasonable, cause the various surfaces and the internal soundness problem of strand to take place frequently, also the bleed-out accident can occur when serious.
Publication number is that the patent of invention of CN 101091982A has proposed a kind of method and apparatus that carries out special-shaped base protection cast with single immersed nozzle; promptly adopt a circle to place special-shaped billet crystallizer web centre to pour into a mould to two water holes of pancake transition submersed nozzle; this method can realize nozzle quick-change, has reduced the molten steel impact depth simultaneously.But; the high-temperature molten steel of mouth of a river outlet can only flow to the vertical two ends of web, and both sides, the edge of a wing can not get replenishing of high-temperature molten steel, make that temperature and component difference that strand is horizontal are bigger; and; mouth of a river wall and crystallizer web wall identity distance occur " bridging " easily from very short, are unfavorable for covering slag thawing and lubricated; in addition; in order to make the mouth of a river can put into web, the wall thickness with the mouth of a river dwindles usually, has reduced the service life at the mouth of a river.
For these reasons as can be known, prior art lower different type billet crystallizer submersed nozzle and pouring type thereof are difficult to satisfy fully the requirement of special-shaped base compound section, and its integrated poured effect is not very good.
Summary of the invention
The technical problem to be solved in the present invention is, at the above-mentioned deficiency of prior art and a kind of casting for shaped blank continuous crystallizer submersed nozzle is provided, make and obtain flow field and temperature field preferably in the crystallizer, can guarantee the uniformity of special-shaped base transverse temperature and composition, stream strand impact depth be can reduce again, the effective come-up of field trash and the normal growth of initial solidification shell promoted.
For solving the problems of the technologies described above, technical solution of the present invention is:
A kind of casting for shaped blank continuous crystallizer submersed nozzle comprises ring body shape sidewall, surrounds the closed bottom of inner chamber with sidewall, offers the water hole on the sidewall, mouth of a river opened upper end; Upper end, the mouth of a river is the funnel-form ring body, the lower end is the cylindrical shape ring body; It is characterized in that: have three water holes near on the cylindrical shape ring body sidewall of bottom, three equal and intracavity inter-connections in water hole, lower wall surface is the plane and all is the angle of inclination with horizontal direction on three water holes.
The last lower wall surface in three water holes all tilts to the outside while of sidewall from interior abreast downward or upward; The inclination alpha that three water holes and horizontal direction are formed slopely is-25 °≤α≤15 °.
In three water holes, wherein two hole size shapes are identical, are the rectangle of four jiaos of chamferings, and two holes along the lumen centers line axisymmetricly, and the 3rd hole is 90 ° of angles layouts with two Kong Jun of symmetry, are up and down to be the shape of rectangle for semicircle, centre.
The beguine of the area in each hole area and the 3rd hole decide according to the sectional area of special-shaped base different parts in two holes of symmetry, and each hole area and the ratio of the area in the 3rd hole equal the ratio of the cross-sectional area of the one-sided edge of a wing of special-shaped base and web in the two symmetrical holes.
The lower wall surface peak in three water holes is in sustained height, is 15mm～40mm apart from the distance of bottom surface, the mouth of a river.
The intracavity section at the mouth of a river be circular, square or chamfering square, bottom, the mouth of a river of inner chamber lower end is sunken bottom, flat or concave bottom.
The sidewall at the mouth of a river is prepared from by refractory material.
As another preferred structure of the present invention, when adopting above-mentioned submersed nozzle to pour into a mould special-shaped base, its arrangement in special-shaped billet crystallizer, the special-shaped base edge of a wing and web two trigonums of intersecting are provided with a described submersed nozzle respectively, two mouths of a river the position along special-shaped base web central vertical line axisymmetricly; Center line and the web central lines between the left and right sides in web center, the 3rd hole all aimed in the 3rd hole at two mouths of a river, and two holes of symmetry distribute axisymmetricly along the web center line.
At this moment, the submersed nozzle upper end links to each other with the tundish bottom, and upper edge, the 3rd hole is 80mm～180mm from the distance range of upper steel liquid level behind the lower end insertion molten steel face.
The present invention has following beneficial effect with respect to prior art:
(1) pouring type in the many water holes of employing, the impact dynamics that can disperse molten steel, improve the thermal center (-tre) of molten steel, the come-up that is very beneficial for non-metallic inclusion in the growth of nascent solidified shell and the molten steel is removed, and can effectively improve slab surface quality and molten steel cleanliness factor.
(2) according to the geomery and the mounting means in special-shaped base cut surface character design water hole, can make even, the stable different parts that flow to crystallizer of molten steel, the temperature and the homogeneity of ingredients in crystallizer cross section have been improved greatly, promote rationally solidifying and the continuous casting process direct motion of base shell, reduced the generation probability of mass defects such as crackle and segregation.
Description of drawings
Fig. 1 is the structural representation of submersed nozzle in the one embodiment of the invention;
Fig. 2 is that one the A in two water holes of symmetry among Fig. 1 is to view;
Fig. 3 is that the B-B of submersed nozzle is to cutaway view;
Fig. 4 is that submersed nozzle is arranged in the cross sectional representation in the special-shaped billet crystallizer.
Label is as follows in the accompanying drawing, 1-sidewall, 2-bottom, 3-inner chamber, 4-first water hole, 5-second water hole, 6-the 3rd water hole, the 7-edge of a wing, 8-web
The specific embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing 1-4, but do not limit the present invention.
As Fig. 1～shown in Figure 4, a kind of special-shaped billet crystallizer submersed nozzle comprises mouth of a river sidewall 1, and the lower end of described mouth of a river sidewall 1 is the bottom 2 of sealing, and bottom 2 can be convex, flat shape or spill.The central passage of mouth of a river sidewall 1 is an inner chamber 3, and described cavity shape can be for circular, square or chamfering is square.2 tops, bottom that are positioned at mouth of a river sidewall 1 have the first and second liang of water holes 4,5 and the 3rd water hole 6 of symmetry, these three water holes all with mouth of a river intracavity inter-connection, last lower edge all is-25 °～15 ° angle with horizontal direction.First and second water holes 4 and 5 equal and opposite in directions, shape are that chamfer radius is that chamfering between 3mm～12mm is square, and the two along the lumen centers line axisymmetricly.It is up and down that semicircle, centre are the shape of rectangle all to be 90 ° angle with water hole 4 and water hole 5 that the 3rd water hole 6 is.Molten steel distributes rationally during for the assurance cast, second water hole 4 and the ratio of the area in water hole 6 should be approximately equal to the ratio of the cross-sectional area of the special-shaped base one-sided edge of a wing 7 and web 8, from cross section shown in the accompanying drawing 4, special-shaped base is divided into the symmetrically arranged edge of a wing 7 of a web 8 and web 8 left and right sides totally three parts, web 8 is meant the neutral straight district of special-shaped base, identical with the slab shape, web 8 each side be an edge of a wing 7, each edge of a wing 7 all starts from the camber line place that links to each other with web 8.
Three mouths of a river lower wall surface minimum point of portalling is in sustained height, is 15～40mm apart from the distance of bottom surface, bottom, the mouth of a river.The sidewall 1 of described submersed nozzle can adopt the refractory material compacting to form, and it is very good that its effect of field application has been proved to be.
In casting process, simultaneously two mouths of a river are inserted the position, two trigonums that the special-shaped base edge of a wing 7 and web 8 intersects respectively, and make two mouths of a river axisymmetricly along the vertical center line of web 8.Simultaneously, guarantee that water hole 4 and 5 aims at the both sides on the edge of a wing 7 respectively, the web centers are aimed in water hole 6, make center line and web central lines between 6 left and right sides, water hole.In addition, for making the molten steel cast degree of depth reasonable, the upper end is linked to each other with the tundish bottom, the upper edge in the 3rd water hole 6 is between 80mm～180mm from the distance of molten steel face behind the lower end insertion molten steel.
Above disclosed only is preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, and therefore the equivalence of being done according to the present patent application claim changes, and still belongs to protection scope of the present invention.
Claims (9)
1. casting for shaped blank continuous crystallizer submersed nozzle comprises ring body shape sidewall, surrounds the closed bottom of inner chamber with sidewall, offers the water hole on the sidewall, mouth of a river opened upper end; Upper end, the mouth of a river is the funnel-form ring body, the lower end is the cylindrical shape ring body; It is characterized in that: have three water holes near on the cylindrical shape ring body sidewall of bottom, three equal and intracavity inter-connections in water hole, lower wall surface is the plane and all is the angle of inclination with horizontal direction on three water holes.
2. the mouth of a river according to claim 1 is characterized in that lower wall surface tilts to the outside while of sidewall downward or upward from interior abreast on three water holes; The inclination alpha that three water holes and horizontal direction are formed slopely is-25 °≤α≤15 °.
3. the mouth of a river according to claim 1 and 2, it is characterized in that in three water holes, wherein two hole size shapes are identical, be the rectangle of four jiaos of chamferings, and two holes along the lumen centers line axisymmetricly, the 3rd hole is 90 ° of angles layouts with two Kong Jun of symmetry, is up and down to be the shape of rectangle for semicircle, centre.
4. the mouth of a river according to claim 3, the beguine that it is characterized in that the area in each hole area and the 3rd hole in two holes of symmetry decide according to the sectional area of special-shaped base different parts, and each hole area and the ratio of the area in the 3rd hole equal the ratio of the cross-sectional area of the one-sided edge of a wing of special-shaped base and web in the two symmetrical holes.
5. according to the claim 1 or the 2 or 4 described mouths of a river, it is characterized in that the lower wall surface peak in three water holes is in sustained height, is 15mm～40mm apart from the distance of bottom surface, the mouth of a river.
6. the mouth of a river according to claim 5, the intracavity section that it is characterized in that the mouth of a river is circular, square or chamfering is square, and the bottom, the mouth of a river of inner chamber lower end is sunken bottom, flat or concave bottom.
7. the mouth of a river according to claim 6 is characterized in that the sidewall at the mouth of a river is prepared from by refractory material.
8. according to the claim 1 or 2 or 4 or the 6 or 7 described mouths of a river, two trigonums of it is characterized in that in special-shaped billet crystallizer, the special-shaped base edge of a wing and web intersecting are provided with a described submersed nozzle respectively, and the position at two mouths of a river along special-shaped base web central vertical line axisymmetricly; The 3rd hole subtend at each mouth of a river relatively and aim at center line and web central lines between the left and right sides in web center, the 3rd hole, two symmetrical holes distribute axisymmetricly along the web center line.
9. the mouth of a river according to claim 8 is characterized in that the submersed nozzle upper end links to each other with the tundish bottom, and upper edge, the 3rd hole is 80mm～180mm from the distance range of upper steel liquid level behind the lower end insertion molten steel face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102541639A CN102274961A (en) | 2011-08-31 | 2011-08-31 | Submersed nozzles for shaped blank continuous casting crystallizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102541639A CN102274961A (en) | 2011-08-31 | 2011-08-31 | Submersed nozzles for shaped blank continuous casting crystallizer |
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| CN102274961A true CN102274961A (en) | 2011-12-14 |
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| CN2011102541639A Pending CN102274961A (en) | 2011-08-31 | 2011-08-31 | Submersed nozzles for shaped blank continuous casting crystallizer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554208A (en) * | 2012-01-18 | 2012-07-11 | 中冶南方工程技术有限公司 | Submersed nozzle for bloom continuous casting crystallizer |
| CN102764865A (en) * | 2012-06-26 | 2012-11-07 | 中冶南方工程技术有限公司 | Submersed nozzle for high-casting-speed continuous casting crystallizer |
| CN103567410A (en) * | 2013-11-04 | 2014-02-12 | 山东西王特钢有限公司 | Process for controlling center porosity of large and round continuous casting billet |
| CN105689698A (en) * | 2016-03-09 | 2016-06-22 | 日照钢铁控股集团有限公司 | Braking-type submerged nozzle for beam blank continuous casting |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554208A (en) * | 2012-01-18 | 2012-07-11 | 中冶南方工程技术有限公司 | Submersed nozzle for bloom continuous casting crystallizer |
| CN102764865A (en) * | 2012-06-26 | 2012-11-07 | 中冶南方工程技术有限公司 | Submersed nozzle for high-casting-speed continuous casting crystallizer |
| CN102764865B (en) * | 2012-06-26 | 2014-11-05 | 中冶南方工程技术有限公司 | Submersed nozzle for high-casting-speed continuous casting crystallizer |
| CN103567410A (en) * | 2013-11-04 | 2014-02-12 | 山东西王特钢有限公司 | Process for controlling center porosity of large and round continuous casting billet |
| CN103567410B (en) * | 2013-11-04 | 2015-10-21 | 山东西王特钢有限公司 | Continuous casting round bloom center porosity Controlling Technology |
| CN105689698A (en) * | 2016-03-09 | 2016-06-22 | 日照钢铁控股集团有限公司 | Braking-type submerged nozzle for beam blank continuous casting |
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Application publication date: 20111214 |