CN106041042B - Special-shaped stainless steel continuous casting tundish - Google Patents
Special-shaped stainless steel continuous casting tundish Download PDFInfo
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- CN106041042B CN106041042B CN201610680387.9A CN201610680387A CN106041042B CN 106041042 B CN106041042 B CN 106041042B CN 201610680387 A CN201610680387 A CN 201610680387A CN 106041042 B CN106041042 B CN 106041042B
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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
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Abstract
The invention discloses a kind of special-shaped stainless steel continuous casting tundish, dam, lower retaining wall, top retaining wall, turbulent flow suppressor are set gradually from left to right inside its involucrum, stopper is set in the dam, long nozzle is set above the turbulent flow suppressor, the distance at the top retaining wall bottom surface distance packet bottom is 180-240mm, the height at the lower retaining wall top surface distance packet bottom is 200-300mm, the distance at top retaining wall center distance mouth of a river center is 550-640mm, and distance of the lower retaining wall away from stopper center is 550-650mm.The beneficial effects of the invention are as follows：Pass through the size and relative position of optimization dam and upper lower retaining wall and the inclination angle of change tundish containment wall, reduce dead zone present in molten steel motion process, make in molten steel casting process temperature field more evenly, be conducive to the floating of field trash, the problems such as forming stable surface bottom horizontal flow sheet, while avoiding the disturbance of molten steel centering cinder inclusion excessive and causing slag.
Description
Technical field
The present invention relates to a kind of special-shaped stainless steel continuous casting tundish, belong to stainless steel production technical field.
Background technique
Stainless steel is chiefly used in the industries such as decoration panel, pressure vessel, product, very to cold hot-rolled sheet coil surface quality requirements
Strictly.Due to non-metallic inclusion（Such as oxide is mingled with, nitride, sulphide inculsion）Presence, not only reduce steel
Processing performance and mechanical property, moreover, having seriously affected the surface grade of stainless-steel roll and the corrosion resisting property of material.
In continuous casting steel machine production process, tundish has as the refractory material containers between Con casting ladle and crystallizer
The metallurgical functions such as purification, temperature adjustment, refining, flow regime, residence time, the thermo parameters method etc. of internal molten steel, in molten steel
The floating of non-metallic inclusion has great influence, is an important factor for influencing steel billet degree of purity.
The applicant has built 1250 stainless steel plate billet continuous casting machines in 2009, under conditions of not changing original workshop into
Row reorganization and expansion, since the initial stage technical capability that limited and found the factory by place is insufficient, the design of tundish shape is restricted.The application
The tundish of people compared with the tundish gone together both at home and abroad, have intermediate packet length is short, capacity is small, before molten bath the deficiencies of place,
It is along with control device nor quite reasonable, stable surface level stream stream cannot be formed in tundish so as to cause molten steel
It is dynamic, it is easy slag, influences Molten Steel Cleanliness and surface quality of billet.
For the above problem for solving tundish, Tundish Flow Field and structure should just be optimized.
Summary of the invention
Goal of the invention of the invention is：In view of the above problems, a kind of novel special-shaped stainless steel continuous casting is provided
Tundish, flow field and structure all more optimize than former tundish, can effectively improve and promote Molten Steel Cleanliness and billet surface
Quality.
Improved though of the invention is：Using original tundish as research object and modeling foundation, Three-dimensional Flow and matter are established
Measure the mathematical model coupling of transmission.On this basis, comparative study barricade and dam combination one-parameter and its multi-parameters optimization work
Then condition and barricade, dam and turbulent flow suppressor are chosen with the use of the distribution situation of MOLTEN STEEL FLOW in tundish under operating condition
It is suitble to the flow control apparatus structure and location parameter of the list flowing plate base tundish.
Due to being restricted by workshop place, this Optimal improvements be do not change big water-coating port and mold gap center line away from
From precondition under, inner cavity capacity, the flow control device of tundish are optimized, to reach reduce the dead zone Zhong Bao, increase
The molten steel residence time forms stable surface bottom horizontal flow sheet, improves the uniformity of cast temperature, as follows to solve the problems, such as：
1 tundish pool depth is lower, and due to the influence of molten steel disturbance, molten steel is difficult to form stable surface in tundish
Level stream flowing, molten steel contact the problem of slag easily occurs with tundish covering flux.
2 intermediate packet lengths are too short, and width is big, and molten steel easily forms dead zone in tundish, and tundish temperature uniformity is poor,
Cast temperature fluctuation is big.
3 tundish charge weights are small, and molten steel is short in the tundish residence time, and inclusion floating is not enough.
It is to establish two mathematical models first when optimizing, i.e., molten steel in three-dimensional kinetic model and tundish
Residence Time Calculation model, followed by establishes physical model, is finally the evaluation for carrying out two mathematical models and physical model.
In hydrodinamical model, MOLTEN STEEL FLOW behavior can use continuity equation, N-S equation and standard k- in tundish
ε both sides journey describes.In tundish in molten steel residence Time Calculation model, to calculate the practical molten steel residence time in tundish
（RTD）, according to stimulation-response theory, inject tracer in 1s into tundish from certain moment, and show in outlet real time monitoring
The concentration changing rule of track agent.
When establishing physical model, commonly use water to simulate molten steel, the reason for this is that water be easy to get and the kinematic viscosity of water with
The kinematic viscosity of 1500 DEG C of molten steel is suitable.
Evaluating two mathematical models and when physical model, based on MOLTEN STEEL FLOW situation in mathematical simulation tundish, have with
Molten steel flow field optimizing index in lower five tundish：
1, dead space volume ratio θdSmall is excellent；
2, tundish exit starts to show the time of tracer, i.e. stagnation time tp, more a length of excellent；
3, big piston flow volume ratio θpWith dead space volume ratio θdThe ratio between, and be excellent without short-circuit flow phenomenon；
4, big piston flow volume ratio θpWith mixed flow volume ratio θmThe ratio between, this is excellent；
5, tundish inner surface piston flow stabilizes to excellent.
Learning prototype is had disclosed using our company uses the stainless steel list stream slab CC tundish of many years as in prototype
Between wrap, casting section range be 180 ×（1020~1260）mm2, pulling rate range is 1.05~1.1 m/min.Due to difference
Section and pulling rate have substantially no effect on analog result, and it is 180 × 1100 mm that this optimizing research, which selects casting section,2, pulling rate selection 1
m/min。
This research first simulates prototype tundish, on this basis around three kinds of different flow controls in tundish
Device combination optimizes experimental study, including：
Dam height and position optimization research；
Barricade and the research of the Combinatorial Optimization of dam；
The Combinatorial Optimization of dam, barricade and turbulator is studied.
In addition, this research is also optimized the shaped position of the inclination angle size of tundish side wall and turbulator and grinds
Study carefully.
The Parameters variations such as the position and structure for barricade, dam are to the MOLTEN STEEL FLOW state and dead zone body in tundish
The influence of product ratio mainly considers following four parameter：
1, distance of the top retaining wall bottom surface away from packet bottom；
2, the height of the height of lower retaining wall, i.e. lower retaining wall top surface away from packet bottom；
3, the position of top retaining wall, the i.e. distance at top retaining wall center distance mouth of a river center；
4, the position of lower retaining wall, i.e. distance of the lower retaining wall center away from stopper center.
This four parameters respectively correspond A, B, C, D in Fig. 1.In Fig. 1,1 is dam, and 2 be stopper, and 3 be lower retaining wall, 4
It is long nozzle for top retaining wall, 5,6 be turbulent flow suppressor.
By analyzing analog result, draw the following conclusions：
1, in pouring area, there are a very big raceway zones.This raceway zone greatly affected the dischargeable capacity of tundish.
Since heat loss is very big after causing molten steel to flow out between barricade and dam there are biggish raceway zone, so that the temperature of pouring area
Degree distribution is very uneven.
2, the distance between upper and lower barricade and dam are narrow.Upper and lower barricade is to the distance between dam and slag blocking wall to wrapping
The ratio of distances constant at bottom is too small, this also causes molten steel " to be rushed " straight up with biggish speed to slag interface, and molten steel encounters slag blanket
Directional velocity has little time to change afterwards, and then causes steel liquid surface fluctuation excessive or even slag occurs.
3, two angle of heel of tundish is too big.Since two angle of heel of tundish is too big, cause to flow to casting area from beam area
Molten steel have little time it is full and uniform unfold to form piston flow just quickly by the side wall " keeping off back " of tundish, lead to the unevenness of Temperature Distribution
Even property.
4, the cavity shape of turbulent flow suppressor is unreasonable, molten steel with the speed of 0.86m/s by long nozzle vertical injection among
Bao Hou in turbulent flow suppressor under the effect of contraction of strong stirring action and its inner wall, forms the stream stock contrary with beam
Flow to beam area Free Surface.But since turbulent flow suppressor outlet is smaller, so that the steel after turbulent flow suppressor straight up
Liquid speed degree is too big, it is most likely that forms biggish disturbance to slag blanket and even " slag blister " occurs.
Therefore, by digital-to-analogue result it is found that the flow control device of prototype tundish is less reasonable, if carried out to it rationally excellent
Change, it will effectively promote its metallurgical performance.
The technical solution adopted by the present invention is that such：
A kind of abnormal shape stainless steel continuous casting tundish is set gradually from left to right dam, lower retaining wall, upper gear inside involucrum
Wall, turbulent flow suppressor, the dam is interior to be arranged stopper, and long nozzle, the top retaining wall bottom surface is arranged above the turbulent flow suppressor
The distance at distance packet bottom is 180-240mm, and the height at the lower retaining wall top surface distance packet bottom is 200-300mm, the top retaining wall
The distance at center distance mouth of a river center is 550-640mm, and distance of the lower retaining wall away from stopper center is 550-650mm.
Data in above-mentioned technical proposal are carried out preferably, the distance at the top retaining wall bottom surface distance packet bottom is 210mm.
Data in above-mentioned technical proposal are carried out preferably, the height at the lower retaining wall top surface distance packet bottom is 250mm.
Data in above-mentioned technical proposal are carried out preferably, the distance at top retaining wall center distance mouth of a river center is
595mm。
Data in above-mentioned technical proposal are carried out preferably, distance of the lower retaining wall away from stopper center is 600mm.
Data in above-mentioned technical proposal are carried out preferably, the inclination angle of wall is 6-10 ° at left and right sides of the involucrum.To above-mentioned
Data in technical solution carry out further preferably, and the inclination angle of wall is 6-10 ° at left and right sides of the involucrum.
Data in above-mentioned technical proposal are carried out preferably, the bottom length is 2600-2700mm.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1, it by the size and relative position of optimization dam and upper lower retaining wall and the inclination angle of change tundish containment wall, reduces
Molten steel dead zone present in big packet long nozzle → slag blocking wall → dam → middle water-coating port motion process, makes molten steel cast
Temperature field more evenly, is conducive to the floating of field trash in journey, forms stable surface bottom horizontal flow sheet, while avoiding molten steel centering packet
Slag disturbance it is excessive and the problems such as cause slag；
2, increase intermediate packet length on the basis of original tundish, expand tundish charge weight, guarantee molten steel in centre
Wrap enough residence times.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
When Fig. 2 is that D value uses 600mm, the speed field pattern of molten steel longitudinal section and cross section；
When Fig. 3 is that D value uses 400mm, the speed field pattern of molten steel longitudinal section and cross section；
When Fig. 4 is that D value uses 200mm, the speed field pattern of molten steel longitudinal section and cross section；
When Fig. 5 is that C value uses 615mm, the speed field pattern of molten steel；
When Fig. 6 is that C value uses 595mm, the speed field pattern of molten steel；
When Fig. 7 is that C value uses 545mm, the speed field pattern of molten steel；
When Fig. 8 is that C value uses 595mm, the thermo parameters method figure of molten steel；
Fig. 9 be two angle of heel of tundish be 12 ° when, the speed field pattern of molten steel；
Figure 10 be two angle of heel of tundish be 8 ° when, the speed field pattern of molten steel.
It is marked in figure：
1 is dam, and 2 be stopper, and 3 be lower retaining wall, and 4 be top retaining wall, and 5 be long nozzle, and 6 be turbulator；
A is distance of the top retaining wall bottom surface away from packet bottom；
B is the height of lower retaining wall, i.e. height of the lower retaining wall top surface away from packet bottom；
C is the position of top retaining wall, the i.e. distance at top retaining wall center distance mouth of a river center；
D is the position of lower retaining wall, i.e. distance of the lower retaining wall center away from stopper center.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
Most preferred embodiment：
As shown in Figure 1, a kind of abnormal shape stainless steel continuous casting tundish, be set gradually from left to right inside involucrum dam 1, under
Barricade 3, top retaining wall 4 and turbulent flow suppressor 6, the dam 1 is interior to be arranged stopper 2, and long nozzle is arranged above the turbulent flow suppressor 6
5, the distance A at 4 bottom surface of the top retaining wall distance packet bottom is 210mm, and the height B at 3 top surface of the lower retaining wall distance packet bottom is
250mm, the distance C at the 4 center distance mouth of a river of top retaining wall, 5 center are 595mm, the distance of the lower retaining wall 3 away from 2 center of stopper
D is 600mm.
Distance D of the lower retaining wall 3 away from 2 center of stopper is determining first.Before the determination, D value is respectively adopted
600mm, 400mm, 200mm have carried out three groups of simulation tests, the molten steel longitudinal section of acquisition and the speed field pattern point of cross section
Not as shown in 2,3,4.
It can be seen that by above three speed field pattern as the 200mm mobile to 2 direction of stopper of lower retaining wall 3, hence it is evident that
Improve prototype tundish due to the distance between dam 1 and lower retaining wall 3, top retaining wall 4 it is narrow caused by go out from 3 bottom of top retaining wall
The phenomenon that molten steel come rushes at desulphurization with larger speed straight up.From figure 2 it can be seen that the molten steel of pouring area " returns
Rotation area " area significantly reduces, is also slowed down the disturbance of slag interface certainly.From figure 3, it can be seen that with lower retaining wall 3
Continuing to the mobile 200mm in 2 direction of stopper, the area of pouring area molten steel " raceway zone ", which is further reduced, almost to disappear, but simultaneously
It can be seen that although major part molten steel is not rushed at so that biggish speed is vertical when molten steel flows to pouring area from 4 lower part of top retaining wall
Slag interface, but the angle that the molten steel of big stock is tilted upward with one rushes at stopper 2 and slag interface intersection, due to scene
Two angle of heel of tundish is excessive, causes the cross section at 2 place of stopper to the narrow space of involucrum side wall, so the molten steel of big stock is very
Encounter involucrum side wall fastly, part molten steel cannot be upheld well as piston flow, this also causes the molten steel near sprue gate unstable.
Figure 4, it is seen that D value is reduced to 200mm when lower retaining wall 3 continues 200mm mobile to 2 direction of stopper, it can be seen that
Serious short-circuit flow occurs for pouring area molten steel and dead space volume becomes larger.Therefore, D value is preferred with 600mm, both can be reduced in this way
Excessive disturbance of the molten steel that the biggish molten steel in pouring area " raceway zone " and alleviation are flowed out from 4 bottom of top retaining wall to slag interface,
Also it is unlikely to that molten steel is closely caused very much not have sufficient space development to be piston flow or occur short apart from sprue gate due to dam 1 simultaneously
The case where road is flowed.
It is found since the result by digital-to-analogue carries out analysis, changes the distance A value at 4 bottom surface of top retaining wall distance packet bottom to improvement
Pouring area molten steel " raceway zone " meaning is not very greatly, so A value still uses the 210mm of prototype tundish.
The lower-upper length and pouring area molten steel for comprehensively considering reduction pouring area molten steel " raceway zone " do not occur a large amount of short
Lu Liu, so the height B value at 3 top surface of lower retaining wall distance packet bottom is advisable using 250mm.
When determining the distance C value at the 4 center distance mouth of a river of top retaining wall, 5 center, four groups of tests are carried out, C is respectively adopted
These three values of 615mm, 595mm, 545mm are simulated.In order to obtain longer mean residence time and pouring area molten steel compared with
Big piston flow volume devises tetra- groups of schemes of A1, A2, A3, A4 and compares research, as a result such as Fig. 5（A1 group, C value are
The speed field pattern of molten steel when 615mm）, Fig. 6（A2 group, the speed field pattern of molten steel when C value is 595mm）, Fig. 7（A3 group,
The speed field pattern of molten steel when C value is 545mm）, Fig. 8（A4 group, the thermo parameters method figure of molten steel when C value is 595mm）It is shown.
The digital-to-analogue result shown in several figures is, it is apparent that when the distance between top retaining wall 4 and long nozzle 5 C value are by prototype
When 645mm gradually reduces as 615mm, 595mm, the mobility status of pouring area molten steel is improving, as shown in Figure 5,6 respectively.When C value
The molten steel dead space volume of pouring area is smaller when for 595mm, and molten steel is also smaller to the disturbance of slag interface, as shown in fig. 6, pouring area
Thermo parameters method it is also visibly homogeneous, as shown in Figure 8.But when C value is further reduced to 545mm, pouring area molten steel flow
Situation starts to degenerate, and as can be seen from Figure 7 pouring area molten steel increases the disturbance of slag interface relatively at this time.Synthesis is examined
Consider the mobility of pouring area molten steel and the uniformity in temperature field, C value selection 595mm is preferred.
The bottom length is 2600-2700mm.
The inclination angle of wall is 8 ° at left and right sides of the involucrum.
Have little time full and uniform relax since two angle of heel of tundish will lead to greatly very much from the molten steel that beam area flows to casting area
Spread, just quickly by tundish side wall " keeping off back ", is formed " raceway zone " at piston flow；Also, tundish two sidewalls are biggish to incline
Angle can also make casting area molten steel temperature extremely uneven, and temperature drop is also larger.So for two angle of heel of tundish optimization according to
Prototype and empirical value devise 12 °, 8 ° of two kinds of different angles compare research, optimum results are shown in Fig. 9（Two angles of heel are 12 °
The speed field pattern of molten steel）, Figure 10（Two angles of heel are the speed field pattern of 8 ° of molten steel）.By Fig. 9,10 can be apparent
Ground is found out, with the reduction of two angle of heel of tundish, increases sprue gate left area space, significantly improves on the left of sprue gate
The mobility of molten steel, to slow down the unstable situation of molten steel near the sprue gate as caused by narrow space.Simultaneously from figure
As can be seen that two angles of heel also slow down disturbance of the pouring area molten steel to slag interface after using 8 ° in 10.Therefore, tundish two
Angle of heel is preferred using 8 °.
The program of the present invention after optimization has the following effect compared with prototype tundish：
1, in water model, mean residence time of the water in tundish increases by 26.4%, and dead space volume reduces 44.8%；It will be excellent
Tundish after change is for producing, then the molten steel dead zone in tundish is reduced to 18.7% by original 33.9%, in tundish
The molten steel residence time, which increases, increases to 690.1s by original 546s, meanwhile, 5 DEG C of the temperature fluctuation < in tundish.
2, the temperature uniformity in tundish greatly increases, and 5 DEG C of temperature fluctuation <.
3, the casting slab oxygen content of tundish is reduced to 3ppm, later period by original 13ppm compared with the amplification of LF oxygen content
Secondary pollution is substantially reduced before relatively optimizing.
3, the stocking product sampling result of tundish is compared with the stocking product for optimizing preceding tundish after optimizing, field trash number
Amount significantly reduces, and most of is fine foreign matter of the size less than 2 μm being precipitated in process of setting, does not find taking before optimization
The size observed in sample is greater than 5 μm of large inclusions.
4, after tundish comes into operation, Products decortication defect incidence is reduced to 1% or less by 2 ~ 3%.
Claims (8)
1. a kind of abnormal shape stainless steel continuous casting tundish, dam is set gradually from left to right inside involucrum（1）, lower retaining wall（3）, on
Barricade（4）, turbulent flow suppressor（6）, the dam（1）Interior setting stopper（2）, the turbulent flow suppressor（6）Long water is arranged in top
Mouthful（5）, it is characterised in that：The top retaining wall（4）The distance at bottom surface distance packet bottom（A）For 180-240mm, the lower retaining wall（3）
The height at top surface distance packet bottom（B）For 200-300mm, the top retaining wall（4）The center distance mouth of a river（5）The distance at center（C）For
550-640mm, the lower retaining wall（3）Away from stopper（2）The distance at center（D）For 550-650mm.
2. abnormal shape stainless steel continuous casting tundish according to claim 1, it is characterised in that：The top retaining wall（4）Bottom surface away from
With a distance from packet bottom（A）For 210mm.
3. abnormal shape stainless steel continuous casting tundish according to claim 1, it is characterised in that：The lower retaining wall（3）Top surface away from
Height from packet bottom（B）For 250mm.
4. abnormal shape stainless steel continuous casting tundish according to claim 1, it is characterised in that：The top retaining wall（4）Center away from
Long nozzle（5）The distance at center（C）For 595mm.
5. abnormal shape stainless steel continuous casting tundish according to claim 1, it is characterised in that：The lower retaining wall（3）Away from stopper
（2）The distance at center（D）For 600mm.
6. abnormal shape stainless steel continuous casting tundish according to claim 1, it is characterised in that：Wall at left and right sides of the involucrum
Inclination angle is 6-10 °.
7. abnormal shape stainless steel continuous casting tundish according to claim 6, it is characterised in that：Wall at left and right sides of the involucrum
Inclination angle is 8 °.
8. according to claim 1, special-shaped stainless steel continuous casting tundish described in 6 or 7, it is characterised in that：The bottom is long
Degree is 2600-2700mm.
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| CN107350464A (en) * | 2017-06-28 | 2017-11-17 | 秦皇岛首秦金属材料有限公司 | A kind of continuous casting production recycling method |
| CN111950107A (en) * | 2019-04-30 | 2020-11-17 | 上海梅山钢铁股份有限公司 | Analysis method for flow characteristics of flow field in multi-flow continuous casting tundish |
| CN117000985B (en) * | 2023-10-08 | 2024-02-20 | 山东有研国晶辉新材料有限公司 | Device for removing internal inclusions of ultra-high-purity copper or copper alloy cast ingot and preparation method |
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| JPS61103653A (en) * | 1984-10-26 | 1986-05-22 | Nippon Steel Corp | Slag removal of tundish |
| CN202684062U (en) * | 2012-07-26 | 2013-01-23 | 莱芜钢铁集团有限公司 | Flow control device for tundish of slab continuous casting machine |
| CN202779748U (en) * | 2012-10-24 | 2013-03-13 | 通化钢铁股份有限公司 | Flow control device for sheet billet continuous casting tundish |
| CN104107905A (en) * | 2013-04-19 | 2014-10-22 | 宝钢特钢有限公司 | Slab continuous casting tundish |
| CN103990787B (en) * | 2014-05-16 | 2016-07-06 | 莱芜钢铁集团有限公司 | A kind of for removing the device and method of molten steel inclusion in continuous casting production |
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Effective date of registration: 20210311 Address after: 614902 No.1, Taishan Road, Jianong Town, Shawan District, Leshan City, Sichuan Province Patentee after: Sichuan Gangchen Stainless Steel Co., Ltd Address before: 614902 Taishan Road, Jianong Town, Shawan District, Leshan City, Sichuan Province Patentee before: SICHUAN SOUTHWEST STAINLESS STEEL Co.,Ltd. |
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Effective date of registration: 20210319 Address after: 614902 No.1, Taishan Road, Jianong Town, Shawan District, Leshan City, Sichuan Province Patentee after: Sichuan Gangchen Stainless Steel Co., Ltd Address before: 614902 Taishan Road, Jianong Town, Shawan District, Leshan City, Sichuan Province Patentee before: SICHUAN SOUTHWEST STAINLESS STEEL Co.,Ltd. |