CN102361712B - Immersion nozzle for continuous casting - Google Patents
Immersion nozzle for continuous casting Download PDFInfo
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- CN102361712B CN102361712B CN201080013055.6A CN201080013055A CN102361712B CN 102361712 B CN102361712 B CN 102361712B CN 201080013055 A CN201080013055 A CN 201080013055A CN 102361712 B CN102361712 B CN 102361712B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
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- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
An immersion nozzle for continuous casting is adapted to discharge molten steel into a mold for continuous steel casting and has a tubular nozzle body which is provided with four molten steel discharge ports consisting of left upper, left lower, right upper and right lower ports which open into a lower end portion of the nozzle body to be immersed into the molten steel in the mold. The two left discharge ports and the two right discharge ports have substantially symmetrical shape with respect to an axis of the nozzle. The left discharge ports are opposed to the inner wall of the left minor side of the mold and the right discharge ports are opposed to the inner wall of the right minor side of the mold. The area of the openings of the lower discharge ports is smaller than the area of the openings of the upper discharge ports. The ratio of the area of the openings of the lower discharge ports to the area of a sum of the areas of the openings of the upper and lower discharge ports is not less than 0.2 but not more than 0.4.
Description
Technical field
The present invention relates in the continuous casting of iron and steel for inject the dipping spray nozzle that melts steel to mold.
Background technology
In mold, there is to collide and be split into the upwelling that rises along mold inwall and along the sinking of mold inwall decline in the discharge currents that melts steel of discharging from the outlet of the pair of right and left of dipping spray nozzle and the short brink inwall of mold.
Now, particularly, discharging the fast situation of flow velocity etc., in the upper and lower of outlet, can produce inhomogenous velocity flow profile.Thus, in upwelling and downwelling, the flow equilibrium of left and right is destroyed, or produces partly strong discharge currents, the larger change of flowing.Such change becomes the main cause that defect that the bad and bubble of the generation of solidified shell and field trash cause produces.
In order to address this problem, considering has by making melting the slowly mobile of steel and forming flowing of homogeneous in mold, can prevent the continuous casting of the defect based on bubble and field trash.Based on such considering, for example in following patent documentation, proposing has at the two-layer dipping spray nozzle (four hole nozzles) that is provided with four cellular types of the outlet that melts steel of above-below direction.
In patent documentation 1, each the upper and lower outlet (,Xia hole, upper hole) of being located at of four hole nozzles has the opening shape of growing crosswise, and when mold length is made as to throughput in L, four hole nozzles and is made as y4, mold upper end and is made as Z to the distance of meniscus, the extended distance I between ,Xia hole, upper hole is I < L-Z-64y4-370.Now, even if improve also non-involvement moulded powder of throughput, can access high-quality slab.
In patent documentation 2, propose to have following scheme, in discharge portion, reduce the area of section of the internal flow path of four hole nozzles, and make the inside dimension (area of section) in lower hole less than the inside dimension in upper hole (area of section), in mold, suppress the generation of extreme rising discharge currents.Thus, avoid the change of liquid level, prevent the defects such as being involved in of powder.
The object of the technology that patent documentation 1 is recorded is to eliminate becomes negative pressure problem, tap top in two hole nozzles.But, as patent documentation 1, making under condition that He Xia hole, upper hole is same shape, the bias current with lower hole side becomes large problem.
In addition, the technology of patent documentation 2 relates to the nozzle of the F-SP that is formed with stage portion in internal flow path.In this technology, along with the area of section based on stage portion changes, the mobile of inside becomes unstable, and the mobile change having from ,Xia hole, upper hole becomes large situation.
In addition, in above-mentioned prior art, be particularly conceived to the just flow velocity that melts steel from outlet is discharged, near the steel flow velocity that the melts short brink inwall at mold, do not do sufficient discussion.
For example, in the situation that it is fast to the flow velocity of the thin position impact of the solidified shell on top to melt steel, due to the effect of impingement flow, the portion of solidifying again melts and makes fluctuation of service.Meanwhile, in the situation that the flow velocity of sinking is fast, bubble and field trash are invaded the deep of slab via sinking, make quality produce defect.
Like this, having by outlet four holes are only reduced to jet flow width is inadequate situation.Therefore,, about the control of the jet flow at upper and lower outlet, need to further inquire into regard near the aspect of the melting steel flow velocity short brink inwall of mold.
Patent documentation 1:(Japan) Unexamined Patent 2-187240 communique
Patent documentation 2:(Japan) JP 2006-198655 communique
Summary of the invention
Therefore, the invention provides a kind of four hole nozzles, solved in continuous casting, the outlet of existing two hole nozzles is divided in four hole nozzles of the shape after two and can not obtains enough deceleration effects, can not fully suppress bubble and field trash and invade the problem of slab inside, can reduce the generation of internal flaw.
The present application persons consider and can not fully suppress bubble and field trash by four hole nozzles that the outlet of existing two hole nozzles is merely divided into the shape after two to invade the reason of slab inside be the abundant deceleration effect that can not obtain melting steel flow velocity, and then its reason is investigated.Its result, finds, the in the situation that of four hole nozzles, it is important within the specific limits that the flow equilibrium of the discharge currents in He Xia hole, upper hole is controlled.In addition, the present application person find, collaborate to become a jet flow on the way respectively from the jet flow of He Xia hole, upper hole discharge by negative pressure, and its result, has jet flow width and broaden, the situation that flow rate attenuation effect diminishes.
Result after the condition that the flow distribution homogenization of melting steel by He Xia hole, upper hole and upper and lower jet flow are not collaborated is inquired into, the present invention who is constructed as follows.
The dipping spray nozzle of first aspect present invention is for melting the immersion nozzle for continuous casting of steel to continuous casting iron and steel with discharge in mold, the nozzle body with tubular, in the described mold of impregnated in of described nozzle body lower end side, melt the position in steel, offer left bank upper strata, left bank lower floor, steel outlet is melted in four of right row upper strata and You Pai lower floors, two outlets of two outlets of described left bank and described right row have with respect to the axle center of described nozzle symmetrical shape roughly, the outlet of described left bank is relative with the left side short brink inwall of described mold, described right row's outlet is relative with the right side short brink inwall of described mold, described in the peristome Area Ratio of the outlet of described lower floor, the peristome area of the outlet on upper strata is little, the ratio of the peristome area sum of the peristome area of the outlet of described lower floor and the outlet of described upper strata and lower floor is more than 0.2, below 0.4.
The dipping spray nozzle of second aspect present invention, on the basis of above-mentioned first aspect, the distance of the upper end of the lower end of the outlet on described upper strata and the outlet of described lower floor can the scope more than 15mm, below 150mm in.
The dipping spray nozzle of third aspect present invention, above-mentioned first or the basis of second aspect on, can be formed as follows He Shang hole, lower hole,, the discharge angle of the outlet on described upper strata and the outlet of described lower floor all in the scope of 5 ° to downward-sloping 45 ° of being inclined upwardly with respect to level, the discharge angle of the outlet of described lower floor take described upper strata outlet discharge angle as benchmark downward-sloping more than 10 °.
The dipping spray nozzle of fourth aspect present invention, above-mentioned first or the basis of second aspect on, the outlet on described upper strata and the outlet of described lower floor can all be roughly rectangle.
Four hole nozzles of the application of the invention cast continuously, can fully control and melt steel flow velocity near the short brink inwall of mold, inhibition makes bubble and field trash invade the deep of slab situation via sinking, can access internal flaw few slab occurs.
Accompanying drawing explanation
Fig. 1 means the figure of cross sectional shape of four hole nozzles of embodiment of the present invention;
The constructed profile of the configuration of four hole nozzles that Fig. 2 A means embodiment of the present invention in mold is the figure observing from the sight line of the long side lateral vertical with mold;
The constructed profile of the configuration of four hole nozzles that Fig. 2 B means embodiment of the present invention in mold is the figure from observing along the axial sight line of nozzle;
That Fig. 3 means is that the result of being resolved by numerical value fluid obtains, the figure of the discharge velocity flow profile in two hole nozzles and four hole nozzles.
That Fig. 4 means is that the result of being resolved by numerical value fluid obtains, the figure of the attenuating of the discharge flow velocity in two hole nozzles and four hole nozzles.
Fig. 5 is the figure of formation of the outlet of four hole nozzles that use of explanation water mould test;
Fig. 6 means the figure of the decline flow velocity of each nozzle that the result of being tested by water mould obtains;
Fig. 7 mean by the result that numerical value fluid is resolved and water mould is tested, obtained, the differential seat angle of discharge currents in Yu Xia hole, upper hole and the figure of the relation of bubbles volume.
Symbol description
1: dipping spray nozzle main body
2: upper hole
3: lower hole
D: the distance of the upper end in the Yu Xia hole, lower end in upper hole
5: mold
5a: short brink inwall
5b: long side inwall
The specific embodiment
Fig. 1 represents the shape of four hole nozzles of embodiment of the present invention.
At the mold 5 of the continuous casting for iron and steel, conventionally use and overlook the structure into rectangle.Melt steel via dipping spray nozzle to the interior discharge of this mold 5.Dipping spray nozzle main body 1 has the paired outlet in left and right 2,3.The outlet of one side comprises hole 2 and lower hole 3.By these outlets, will melt steel minute upper left, lower-left, upper right and bottom right four direction to the interior discharge of mold 5.From the discharge currents that melts steel of left and right outlet and the short brink inwall 5a of mold 5, there is to collide and then be split into the upwelling rising along mold 5 inwalls and the sinking declining along mold 5 inwalls.
Dipping spray nozzle main body 1 forms tubular so that melt the mode that steel can from top to down passes through, and in the position impregnated in mold 5 of its bottom, is provided with the outlet that melts steel.This outlet is divided into hole 2 and lower hole 3 and forms two-layer up and down.In two relative positions of short brink inwall 5a of the mold 5 with iron and steel, be provided with and clip each two of left and right, nozzle axle center, amount to four outlets.
Two outlets of two outlets of left bank and right row have with respect to the axle center of described nozzle symmetrical shape roughly.The outlet of left and right can be also the plane Mirror Symmetry with respect to comprising nozzle axle center, and the outlet of left and right can also be with respect to nozzle axle center Rotational Symmetry.The outlet of left bank is relative with the left side short brink inwall of described mold, and right row's outlet is relative with the right side short brink inwall of described mold.The peristome area of the outlet on the peristome Area Ratio upper strata of the outlet of lower floor is little.At the peristome area of the outlet of left and right Ge Paizhong， lower floor, with respect to the ratio of the peristome area sum of the outlet of upper strata and lower floor, be more than 0.2, below 0.4.
Fig. 2 A and Fig. 2 B represent the configuration of the dipping spray nozzle main body 1 in mold 5.It is essentially rectangular that the vertical wall of formation mold 5 is overlooked while seeing, has one group of minor face and a group leader limit.The pair of right and left outlet 2,3 of dipping spray nozzle main body 1 is and opening relative with the short brink inwall 5a of mold 5 respectively.
Conventionally, the quantitative change that decays is large along with reducing of jet flow width for the known flow velocity that melts steel of discharging from nozzle, by forming four hole nozzles, can reduce the jet flow width of each tap.Its result, by the attenuating of flow velocity, the value of the Peak Flow Rate in jet flow reduces, and realizes the effect that suppresses bubble and field trash intrusion slab inside.
But, the present application persons find, use four hole nozzles to implement the result of continuous casting, only form the shape that merely outlet of existing two hole nozzles is divided into two, can not obtain enough deceleration effects, can not fully suppress bubble and field trash and invade slab inside.
The present application persons analyze obtaining the reason of enough deceleration effects as follows.That is, in the situation that the shape in He Xia hole, upper hole is identical, because the pressure differential of melting in steel short transverse makes to destroy by the flow equilibrium in He Xia hole, upper hole.The jet flow of being discharged by He Xia hole, upper hole respectively in addition, is collaborated into a jet flow on the way by the negative pressure producing between these jet flows.As a result, jet flow width broadens, and the attenuating of flow velocity diminishes.The present application persons consider that these are one of reason of insufficient flow velocity.
Therefore,, in order to obtain the condition that the flow distribution homogenization of melting steel by He Xia hole, upper hole and upper and lower jet flow are not collaborated, He Xia hole, upper hole size and He Xia hole, the upper hole discharge angle of melting steel jet flow separately separately inquired into.
First, about the optimum value of upper hole and lower hole size, by numerical value fluid, resolve and inquire into melting the action of steel.
Owing to having the pressure differential of melting in steel short transverse, even so identical nozzle form, the flow of the capacity by He Xia hole, upper hole is different.Therefore, the assignment of traffic optimization of melting steel by He Xia hole, upper hole is reduced in near the flow velocity of the sinking that the melts steel short brink inwall of mold as the target of this parsing.To this, to making the nozzle of a plurality of shapes that the Area Ratio of the discharge portion in He Xia hole, upper hole changes carry out the parsing of numerical value fluid, and the impact of the variation of Area Ratio is inquired into.
In this is resolved, nozzle footpath is 160mm.As outlet, suppose four hole nozzles 1～5 and existing two hole nozzles in the He Xia hole, upper hole that is formed with the rectangle with the aperture area shown in table 1 and evaluate respectively.In these are evaluated, making just melting under the condition that steel Peak Flow Rate is 3.4m/sec from nozzle is discharged obtain velocity flow profile, evaluate at the flow velocity that leaves 800mm position, nozzle axle center.
Fig. 3 represents that Fig. 4 represents the Peak Flow Rate in each nozzle from the flow distribution of the jet flow of each nozzle discharge.Fig. 3 is the sectional view along each nozzle in nozzle axle center, and the jet flow more than a certain amount of exists on point and illustrates a little.
As shown in Figure 3, in four hole nozzles, by the Area Ratio in Dui Xia hole, upper hole is changed, change flow distribution.
Then,, with regard to the nozzle of a plurality of formations of table 1 representative, obtain separately the maximum decline flow velocity (m/sec) apart from 800mm position, nozzle axle center.Fig. 4 resolves this result, and the Area Ratio (becoming below open area ratio) with respect to the peristome in Yu Xia hole, upper hole, illustrates maximum decline flow velocity.
As shown in Figure 4, in open area ratio is the scope more than 0.2, below 0.4, obtain the low such effect of maximum decline flow velocity.Particularly, in open area ratio is the scope more than 0.25, below 0.375, maximum decline flow velocity further reduces.
Table 1
Then,, to He Xia hole, the upper hole discharge angle of melting steel jet flow separately, carry out water mould test (water モ デ Le Try test) and inquire into.
Use the mold of 240 * 1300 * 1390mm (thickness, width, the degree of depth), four different hole nozzles of the discharge angle in hole He Xia hole in making.Enforcement makes water in the water mould experiment of these nozzle circulations, measures flow velocity, liquid level change and the bubble amount of being involved in of discharge currents.
Fig. 5 gathers the formation of the outlet of four hole nozzles that represent that the test of water mould is used.As shown in the figure, the discharge angle in upper hole is downtilt angles=15 °, level, angle=7 ° three kinds of being inclined upwardly, and the discharge angle in lower hole is all downtilt angles=15 °.In addition, in order comparing, also to manufacture two hole nozzles, this to be tested.
The mensuration of the liquid level change in the test of water mould, utilizes the curved liquid of high-speed camera camera portion (water surface portion), by measuring the amplitude of the average liquid level change between 60 seconds, is undertaken.In addition, the mensuration that is involved in bubbles volume is blown into air by the mid portion from nozzle and by the sinking in high-speed camera camera mold, produces position at center, measures the number of bubbles in picture and carries out.
Fig. 6 represents from nozzle is discharged, at the decline flow velocity (maximum) apart from meniscus 1000mm position.Represented situation about changing by the flow velocity that the discharge angle in upper hole changed make to decline, the nozzle that obtains discharging angle and be 0 ° (level) represents the result of minimum of a value.In addition, about discharging angle, negative value be take horizontal direction and is represented situation upwards as benchmark, on the occasion of take horizontal direction, represents downward situation as benchmark.
Table 2 represents the result of the water mould test of each nozzle of use.In addition, measured value is made as 100 by the measurement result of two hole nozzles, and the measurement result standardization of other nozzles is represented.
About the bubbles volume that is involved in based on sinking, four hole nozzles be all moderate below.But in the situation that form the nozzle in hole with the discharge angle of 7 ° of being inclined upwardly, liquid level change becomes large.In addition, the situation identical with the discharge angle in He Xia hole, upper hole compared, be provided with 15 ° of differences nozzle one side to be involved in bubbles volume few.From this result, by from He Xia hole, hole melt steel jet flow in discharge differential seat angle is set, can reduce the interflow effect of upper hole discharge currents and lower hole discharge currents.
Table 2
Based on above, utilize the discussion that numerical value fluid resolves and the experiment that makes water mould, the result of further inquiring into, forms the invention described above.
Below, to forming each item of the present invention, further illustrate.
In the present invention, the both sides that are formed in nozzle are provided with four hole nozzles of upper and lower two-layer outlet.By using four hole nozzles, there is the situation of two hole nozzles to compare with use, make to melt flowing slowly of steel, easily form flowing of homogeneous.
Impregnated in of nozzle bottom, melt the part in steel, in two positions that short brink inwall is relative with mold, be respectively equipped with the bilevel outlet being formed by He Xia hole, upper hole.
The shape of outlet is not particularly limited, and upper hole, lower Kong Douwei rectangle are for well.Like this, can further reduce, from the fluctuation of the discharge rate of each outlet discharge, to play the mobile effect that forms homogeneous.
It is desirable to, on the Area Ratio of the peristome in lower hole, the area of the peristome in hole is little.It is desirable to, the aperture area that makes lower hole is 0.2～0.4 times of total aperture area in He Xia hole, upper hole.
Like this, by making the aperture area in lower hole, be 0.2～0.4 times of total aperture area in He Xia hole, upper hole, even if melt the pressure differential that steel has in short transverse, also can make by the flow distribution homogeneous that melts steel in He Xia hole, upper hole.As a result, the discharge currents that can make to discharge from He Xia hole, upper hole is slowly changed, homogenization, can in mold, discharge melting steel, can reduce the flow velocity that melts near the sinking of steel mold short brink inwall.
From the discharge angle of melting steel jet flow (angle of inclination in outlet axle center) in He Shang hole, lower hole respectively with respect to level in the scope of 5 ° to downward-sloping 45 ° of being inclined upwardly for well.
,Xia hole, the upper hole angle that is inclined upwardly all surpasses 5 °, because liquid level change is involved in powder.In addition, if downtilt angles all surpasses 45 °, bubble and field trash are easily invaded the inside of slab.In order more effectively to prevent entering of bubble and field trash, the discharge angle in upper hole in the scope of 5 °～downward-sloping 15 ° of being inclined upwardly for well.
In addition, the axle center that represents hole 2 in Fig. 1 is level (angle of inclination: α=0 °), the axle center in lower hole 3 is with respect to the downward-sloping (angle of inclination: β) and situation about forming of level.
In addition, due to the discharge differential seat angle in Yu Xia hole, upper hole, from the discharge currents in upper hole with from the interflow change in location of the discharge currents in lower hole.Therefore, so that the axle center angle that the discharge angle in lower hole forms He Shang hole, lower hole than the further downward-sloping 10 ° of above modes of the discharge angle in upper hole for good.
Fig. 7 represents the result differential seat angle of discharge currents and the relation of bubbles volume that obtain, He Xia hole, upper hole by numerical value fluid is resolved and water mould is tested.In Fig. 7, (a) portion means the chart of relation of the position, interflow (apart from the distance of nozzle center) of the differential seat angle in Yu Xia hole, hole and the discharge currents in Yu Xia hole, upper hole, (b) portion means the chart of relation in the interflow speed of position, interflow, and (c) portion means jet speed and is involved in the chart of the relation of bubbles volume.
As shown in (a) portion, if make the differential seat angle of discharge currents be changed to 0～22 °, follow the increase of differential seat angle, position, interflow moves to the position away from outlet.Follow position, interflow to leave from tap, as shown in (b) portion, jet speed reduces, and follows this minimizing, and as shown in (c) portion, the bubble amount of being involved in reduces.
If (c) portion from Fig. 7 is to as shown in the arrow mark of (a) portion, with respect on the discharge angle in hole in the situation that there is more than 10 ° differential seat angle in the direction that downward direction tilts the discharge angle in hole under setting, be involved in bubbles volume and stably reduce.At differential seat angle in the situation that in the scope more than 10 °, below 22 °, bubbles volume reduces ideally.More preferably, differential seat angle is in the scope more than 15 °, below 20 °.In such formation, can more effectively prevent the interflow from the discharge jet flow of melting steel in He Xia hole, upper hole.
If the scope that the distance B of the upper end in the Yu Xia hole, lower end (lower floor's outlet) of upper hole (upper strata outlet) is 15mm～150mm is more desirable.More than if this is spaced apart 15mm, the interflow of melting up and down steel stream of discharging from outlet is more effectively prevented, further adds to force and melts the effect that steel is discharged from two holes dispersions.In addition, if make being spaced apart below 150mm of upper and lower outlet, even if there is the pressure differential in short transverse in the situation that melt steel, also can more suitably maintain the flow equilibrium by upper and lower outlet.
The present invention forms as above, below, by embodiment, further illustrate operational feasibility of the present invention and effect.
Embodiment
By the casting of vertical curve continuous casting machine, C measures: the Al-Si killed steel of 0.08 quality %.
During manufacture, as embodiment, use the following nozzle forming.
(1) the peristome area in lower hole be He Xia hole, upper hole total area 37.5%, the discharge angle in He Xia hole, upper hole is four hole nozzles of downward-sloping 15 ° (embodiment 1) all.
(2) the discharge angle in upper hole is 0 °, four hole nozzles (embodiment 2) that the discharge angle in lower hole is downward-sloping 15 °.
In addition, as a comparative example, use the nozzle that has following formation.
(3) two hole nozzles (comparative example 1).
(4) the peristome area in He Shang hole, lower hole equates, discharges all four hole nozzles of downward-sloping 15 ° (comparative example 2) of angle.
Utilize light microscope that the bubble of the central part in the slab obtaining, field trash are observed, measured, the measurement result of the slab that two hole nozzles that use comparative example 1 are obtained is made as 100, by the measurement result indexation (standardization) of the slab of using other nozzles to obtain.
Table 3 represents bubble, the field trash index of the slab of each nozzle casting of use.In an embodiment of the present invention, compare with existing four hole nozzles of comparative example 2, can suppress bubble, field trash enters to slab.In addition, in the situation that the discharge angle in He Xia hole, upper hole is provided with the embodiment 2 of more than 10 ° differences, can obtain better result.
Table 3
Utilizability in industry
Four hole nozzles of the application of the invention cast continuously, can access the few slab of generation of internal flaw, so the present invention in continuous casting field, have can be larger industry on utilizability.
The present invention advocates the priority of No. 2009-074687, the Patent of filing an application in Japan on March 25th, 2009 and here cites its content.
Claims (3)
1. an immersion nozzle for continuous casting, discharges and melts steel in the mold that this immersion nozzle for continuous casting is used to continuous casting iron and steel, it is characterized in that having the nozzle body of tubular,
In the described mold of impregnated in of described nozzle body lower end side, melt the position in steel, offer left bank upper strata, left bank lower floor, right row upper strata and four of You Pai lower floors and melt steel outlet,
Two outlets of two outlets of described left bank and described right row have with respect to the axle center of described nozzle symmetrical shape roughly,
The outlet of described left bank is relative with the left side short brink inwall of described mold,
Described right row's outlet is relative with the right side short brink inwall of described mold,
Described in the peristome Area Ratio of the outlet of described lower floor, the peristome area of the outlet on upper strata is little,
The ratio of the peristome area sum of the peristome area of the outlet of described lower floor and the outlet of described upper strata and lower floor is more than 0.2 and below 0.4,
Form in such a way He Shang hole, lower hole,, the discharge angle of the outlet on described upper strata and the outlet of described lower floor all in the scope of 5 ° to downward-sloping 45 ° of being inclined upwardly with respect to level, the discharge angle of the outlet of described lower floor take described upper strata outlet discharge angle as benchmark downward-sloping more than 10 °.
2. immersion nozzle for continuous casting as claimed in claim 1, is characterized in that, in the scope of the distance of the upper end of the lower end of the outlet on described upper strata and the outlet of described lower floor more than 15mm and below 150mm.
3. immersion nozzle for continuous casting as claimed in claim 1 or 2, is characterized in that, the outlet on described upper strata and the outlet of described lower floor are all roughly rectangle.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-074687 | 2009-03-25 | ||
| JP2009074687 | 2009-03-25 | ||
| PCT/JP2010/002147 WO2010109887A1 (en) | 2009-03-25 | 2010-03-25 | Immersion nozzle for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102361712A CN102361712A (en) | 2012-02-22 |
| CN102361712B true CN102361712B (en) | 2014-02-26 |
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| CN201080013055.6A Active CN102361712B (en) | 2009-03-25 | 2010-03-25 | Immersion nozzle for continuous casting |
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|---|---|
| JP (1) | JP4874431B2 (en) |
| CN (1) | CN102361712B (en) |
| BR (1) | BRPI1011869B1 (en) |
| WO (1) | WO2010109887A1 (en) |
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| JP5645736B2 (en) * | 2011-03-31 | 2014-12-24 | 黒崎播磨株式会社 | Immersion nozzle for continuous casting |
| CN103586451A (en) * | 2013-11-01 | 2014-02-19 | 中天钢铁集团有限公司 | Brake type immersion water gap for volume production |
| KR101597254B1 (en) * | 2014-10-31 | 2016-02-24 | 주식회사 포스코 | Submerged nozzle for continuous casting |
| WO2023188837A1 (en) * | 2022-04-01 | 2023-10-05 | Ｊｆｅスチール株式会社 | Submerged entry nozzle for continuous casting, and continuous casting method for steel |
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| CN2362624Y (en) * | 1999-02-11 | 2000-02-09 | 北京科技大学 | Submerged type pouring head for continuous casting thin sheet blank |
| CN2784106Y (en) * | 2005-04-01 | 2006-05-31 | 唐山钢铁股份有限公司 | Four-hole heterotypic submerged nozzle for continuous casting of thin slabs |
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| CN201186346Y (en) * | 2008-04-25 | 2009-01-28 | 宝山钢铁股份有限公司 | Immersion water inlet of technique for pouring broad plate blank with double-water inlet |
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| JPS5588347U (en) * | 1978-12-12 | 1980-06-18 | ||
| JPS5588347A (en) * | 1978-12-27 | 1980-07-04 | Fujitsu Ltd | Automatic aligning system |
| JPH0628778B2 (en) * | 1989-01-11 | 1994-04-20 | 川崎製鉄株式会社 | Immersion nozzle for high speed continuous casting |
| JP4456491B2 (en) * | 2005-01-20 | 2010-04-28 | 新日本製鐵株式会社 | Porous immersion nozzle and continuous casting method using the same |
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2010
- 2010-03-25 WO PCT/JP2010/002147 patent/WO2010109887A1/en active Application Filing
- 2010-03-25 JP JP2011505882A patent/JP4874431B2/en active Active
- 2010-03-25 CN CN201080013055.6A patent/CN102361712B/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2010109887A1 (en) | 2012-09-27 |
| BRPI1011869B1 (en) | 2021-05-04 |
| BRPI1011869A2 (en) | 2016-03-29 |
| JP4874431B2 (en) | 2012-02-15 |
| CN102361712A (en) | 2012-02-22 |
| WO2010109887A1 (en) | 2010-09-30 |
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