CN106041042A - Special-shaped stainless steel continuous casting tundish - Google Patents
Special-shaped stainless steel continuous casting tundish Download PDFInfo
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- CN106041042A CN106041042A CN201610680387.9A CN201610680387A CN106041042A CN 106041042 A CN106041042 A CN 106041042A CN 201610680387 A CN201610680387 A CN 201610680387A CN 106041042 A CN106041042 A CN 106041042A
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- tundish
- molten steel
- retaining wall
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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
Abstract
The invention discloses a special-shaped stainless steel continuous casting tundish. A blocking dam, a lower blocking wall, an upper blocking wall and a turbulent flow inhibitor are sequentially arranged in a tundish shell of the special-shaped stainless steel continuous casting tundish from left to right; a stopper rod is arranged in the blocking dam; a long water port is formed above the turbulent flow inhibitor; the distance between the bottom face of the upper blocking wall and the tundish bottom ranges from 180 mm to 240 mm; the height from the top face of the lower blocking wall to the tundish bottom ranges from 200 mm to 300 mm; the distance between the center of the upper blocking wall and the center of the long water port ranges from 550 mm to 640 mm; and the distance between the lower blocking wall and the center of the stopper rod ranges from 550 mm to 650 mm. The special-shaped stainless steel continuous casting tundish has the beneficial effects that by optimizing the sizes and the relative positions of the blocking dam, the upper blocking wall and the upper blocking wall and changing the inclination angle of the tundish wall of the tundish, the dead area existing in the moving process of molten steel is reduced, a temperature field in the molten steel casting process is more uniform, inclusion can float up easily, the stable surface horizontal flowing is formed, and meanwhile, the problems of slag inclusion and the like caused when disturbance of molten steel on tundish slag is too large are solved.
Description
Technical field
The present invention relates to a kind of special-shaped stainless steel continuous casting tundish, belong to rustless steel production technical field.
Background technology
Rustless steel is used for decorating the industries such as panel, pressure vessel, goods, to cold hot-rolled sheet coil surface quality requirements very
Strictly.Due to non-metallic inclusion (as oxide be mingled with, nitride, sulphide inculsion etc.) existence, not only reduce steel
Processing characteristics and mechanical property, and, had a strong impact on the surface grade of stainless-steel roll and the corrosion resisting property of material.
In continuous casting steel machine production process, tundish, as the refractory material containers between Con casting ladle and crystallizer, has
The metallurgical functions such as purification, homoiothermic, refine, its internal flow regime of molten steel, the time of staying, thermo parameters method etc., in molten steel
The floating of non-metallic inclusion has material impact, is the key factor affecting steel billet degree of purity.
The applicant built 1250 corrosion resistant plate billet continuous casting machines in 2009, entered under conditions of not changing original Factory Building
Row reorganization and expansion, owing to being limited and founding the factory initial stage technical capability deficiency by place, the design of tundish shape is restricted.The application
The tundish of people, compared with the tundish gone together both at home and abroad, has that tundish length is short, capacity is little, a weak point such as before molten bath,
It is not quite reasonable for adding control device, thus causes molten steel can not form stable surface level stream stream in tundish
Dynamic, easy slag, affect Molten Steel Cleanliness and billet surface quality.
For solving the problems referred to above of tundish, just Tundish Flow Field and structure should be optimized.
Summary of the invention
The goal of the invention of the present invention is: for the problem of above-mentioned existence, it is provided that a kind of novel special-shaped stainless steel continuous casting
Tundish, its flow field and structure all more optimize than former tundish, it is possible to be effectively improved lifting Molten Steel Cleanliness and billet surface
Quality.
The improved though of the present invention is: with original tundish for object of study and modeling foundation, set up Three-dimensional Flow and matter
The mathematical model coupling of amount transmission.On this basis, comparative study barricade and dam combine one-parameter and multi-parameters optimization work thereof
Condition, and barricade, dam and turbulent flow suppressor are with the use of the distribution situation of MOLTEN STEEL FLOW in tundish under operating mode, then choose
It is suitable for flow control apparatus structure and the location parameter of this single current slab tundish.
Owing to being restricted by Factory Building place, this Optimal improvements be do not change big water-coating port and mold gap centrage away from
From precondition under, inner chamber capacity, the flow control device of tundish is optimized, to reach reduce Zhong Bao dead band, increase
The molten steel time of staying, form stable surface bottom horizontal flow sheet, improve the uniformity of cast temperature, to solve following problem:
1 tundish pool depth is relatively low, and due to the impact of molten steel disturbance, in tundish, molten steel is difficult to form stable surface level
Stream flowing, molten steel contacts the problem that slag easily occurs with tundish covering flux.
2 tundish length are the shortest, and width is big, and molten steel is easily formed dead band in tundish, tundish temperature lack of homogeneity,
Cast temperature fluctuation is big.
3 tundish charge weights are little, and molten steel is short in the tundish time of staying, and inclusion floating is the most abundant.
When being optimized, first it is intended to set up two mathematical modeies, molten steel in i.e. three-dimensional kinetic model and tundish
Residence Time Calculation model, next to that set up physical model, is finally by two mathematical modeies and the evaluation of physical model.
In hydrodinamical model, in tundish, MOLTEN STEEL FLOW behavior can use equation of continuity, N-S equation and standard k-
ε both sides' journey describes.In tundish in molten steel residence Time Calculation model, for the actual molten steel time of staying in calculating tundish
(RTD), according to stimulation-response theory, from certain moment, in tundish, inject tracer in 1s, and show in outlet monitoring in real time
The concentration change rule of track agent.
When setting up physical model, conventional water simulates molten steel, its reason be water be readily available and water kinematic viscosity with
The kinematic viscosity of the molten steel of 1500 DEG C is suitable.
Evaluating two mathematical modeies and during physical model, based on MOLTEN STEEL FLOW situation in mathematical modelling tundish, have with
Molten steel flow field optimizing index in lower five tundish:
1, dead space volume ratio θdLittle for 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 θdRatio, and be excellent without short-circuit flow phenomenon；
4, big piston flow volume ratio θpWith mixed flow volume ratio θmRatio, this is excellent；
5, tundish inner surface piston flow stabilizes to excellent.
Learning prototype discloses using our company and has used rustless steel single current slab CC tundish for many years as in prototype
Between wrap, its cast section scope be 180 × (1020～1260) mm2, pulling rate scope is 1.05～1.1 m/min.Due to difference
Section and pulling rate have substantially no effect on analog result, and this optimizing research selects cast section to be 180 × 1100 mm2, pulling rate selects 1
m/min。
First prototype tundish is simulated, on this basis around three kinds of different flow controls in tundish by this research
Device compound mode is optimized experimentation, including:
Dam height and position optimization research；
The Combinatorial Optimization research of barricade and dam；
The Combinatorial Optimization research of dam, barricade and turbulator.
It addition, the inclination angle size of tundish sidewall and the shaped position of turbulator are also optimized and grind by this research
Study carefully.
For barricade, the gear Parameters variation such as dam location and structure to the MOLTEN STEEL FLOW state in tundish and dead band body
The impact of long-pending ratio mainly considers following four parameter:
1, the top retaining wall bottom surface distance away from the bag end；
2, the height of lower retaining wall, the i.e. lower retaining wall end face height away from the bag end；
3, the position of top retaining wall, the i.e. distance at top retaining wall centre-to-centre spacing long nozzle center；
4, the position of lower retaining wall, the i.e. distance at lower retaining wall centre-to-centre spacing stopper center.
A, B, C, D in these four parameters corresponding diagram 1 respectively.In FIG, 1 is dam, and 2 is stopper, and 3 is lower retaining wall, 4
For top retaining wall, 5 is long nozzle, and 6 is turbulent flow suppressor.
By analog result is analyzed, it is concluded that
1, there is a raceway zone the biggest in pouring area.This raceway zone greatly have impact on the dischargeable capacity of tundish.Due to
There is bigger raceway zone causes molten steel heat after flowing out between barricade and dam to scatter and disappear the biggest so that the temperature of pouring area is divided
Cloth is the most uneven.
2, the distance between upper and lower barricade and dam is narrow.Upper and lower barricade to the distance between dam with slag blocking wall to wrapping
The ratio of distances constant at the end is the least, and this also causes molten steel " to rush " straight up to slag interface with bigger speed, and molten steel runs into slag blanket
Rear velocity attitude has little time to change, and then causes that steel liquid surface fluctuation is excessive even occurs slag.
3, tundish two angle of heel is the biggest.Owing to tundish two angle of heel is too big, cause flowing to casting area from beam district
Molten steel has little time full and uniform formation piston flow of unfolding the most quickly " to be kept off back " by the sidewall of tundish, causes the inequality 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 in the middle of
Bao Hou, in turbulent flow suppressor under the effect of contraction of strong agitation effect and inwall thereof, forms the stream stock in opposite direction with beam
Flow to beam district Free Surface.But owing to turbulent flow suppressor outlet is less so that steel straight up after turbulent flow suppressor
Liquid speed is the biggest, it is most likely that slag blanket is formed bigger disturbance and " slag blister " even occurs.
Therefore, from digital-to-analogue result, the flow control device of prototype tundish is less reasonable, if carrying out the most excellent to it
Change, it will effectively promote its metallurgical performance.
The technical solution used in the present invention is such that
A kind of special-shaped stainless steel continuous casting tundish, from left to right sets gradually dam, lower retaining wall, top retaining wall, rapids inside its involucrum
Stream suppressor, arranges stopper in described dam, described turbulent flow suppressor is provided above long nozzle, described top retaining wall bottom surface distance bag
The distance at the end is 180-240mm, and the height at the described lower retaining wall end face distance bag end is 200-300mm, described top retaining wall centre-to-centre spacing
The distance at long nozzle center is 550-640mm, and the described lower retaining wall distance away from stopper center is 550-650mm.
Carrying out the data in technique scheme preferably, the distance at the described top retaining wall bottom surface distance bag end is 210mm.
Carrying out the data in technique scheme preferably, the height at the described lower retaining wall end face distance bag end is 250mm.
Carrying out the data in technique scheme preferably, the distance at described top retaining wall centre-to-centre spacing long nozzle center is
595mm。
Carrying out the data in technique scheme preferably, the described lower retaining wall distance away from stopper center is 600mm.
Carrying out the data in technique scheme preferably, the inclination angle of described involucrum left and right sides wall is 6-10 °.To above-mentioned
Data in technical scheme carry out further preferably, and the inclination angle of described involucrum left and right sides wall is 6-10 °.
Data in technique scheme are carried out preferably, a length of 2600-2700mm of described bottom.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, by optimizing dam and the size of upper lower retaining wall and relative position and the inclination angle of change tundish containment wall, molten steel is reduced
Dead band present in motor process from big bag long nozzle → slag blocking wall → dam → middle water-coating port, during making molten steel casting
Temperature field evenly, the beneficially floating of field trash, form stable surface bottom horizontal flow sheet, avoid molten steel centering cinder inclusion to disturb simultaneously
Move excessive and cause the problems such as slag；
2, on the basis of original tundish, increase tundish length, expand tundish charge weight, it is ensured that molten steel is at tundish foot
Enough time of staying.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
When Fig. 2 is D value employing 600mm, the velocity field scattergram of molten steel longitudinal section and cross section；
When Fig. 3 is D value employing 400mm, the velocity field scattergram of molten steel longitudinal section and cross section；
When Fig. 4 is D value employing 200mm, the velocity field scattergram of molten steel longitudinal section and cross section；
When Fig. 5 is C value employing 615mm, the velocity field scattergram of molten steel；
When Fig. 6 is C value employing 595mm, the velocity field scattergram of molten steel；
When Fig. 7 is C value employing 545mm, the velocity field scattergram of molten steel；
When Fig. 8 is C value employing 595mm, the thermo parameters method figure of molten steel；
Fig. 9 is tundish two angle of heel when being 12 °, the velocity field scattergram of molten steel；
Figure 10 is tundish two angle of heel when being 8 °, the velocity field scattergram of molten steel.
Labelling in figure:
1 is dam, and 2 is stopper, and 3 is lower retaining wall, and 4 is top retaining wall, and 5 is long nozzle, and 6 is turbulator；
A is the top retaining wall bottom surface distance away from the bag end；
B is the height of lower retaining wall, i.e. the lower retaining wall end face height away from the bag end；
C is the position of top retaining wall, i.e. the distance at top retaining wall centre-to-centre spacing long nozzle center；
D is the position of lower retaining wall, i.e. the distance at lower retaining wall centre-to-centre spacing stopper center.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the present invention is described in detail.
Most preferred embodiment:
As it is shown in figure 1, a kind of special-shaped stainless steel continuous casting tundish, inside its involucrum, from left to right set gradually dam 1, lower retaining wall
3, top retaining wall 4 and turbulent flow suppressor 6, arranges stopper 2 in described dam 1, described turbulent flow suppressor 6 is provided above long nozzle 5, institute
Distance A stating the top retaining wall 4 bottom surface distance bag end is 210mm, and the height B at the described lower retaining wall 3 end face distance bag end is 250mm, institute
Distance C stating top retaining wall 4 centre-to-centre spacing long nozzle 5 center is 595mm, and the described lower retaining wall 3 distance D away from stopper 2 center is
600mm。
First the described lower retaining wall 3 distance D away from stopper 2 center determines.Before the determination, D value is respectively adopted
600mm, 400mm, 200mm have carried out three groups of simulation tests, it is thus achieved that molten steel longitudinal section and the velocity field scattergram of cross section divide
Not as shown in 2,3,4.
By above three velocity field scattergram it can be seen that when dam 1 moves 200mm to stopper 2 direction, hence it is evident that change
Be apt to that prototype tundish causes owing to the distance between dam 1 and top retaining wall 3, lower retaining wall 4 is narrow bottom top retaining wall 3 out
Molten steel rush at the phenomenon of desulphurization straight up with bigger speed.From figure 2 it can be seen that " the convolution of the molten steel of pouring area
District " area significantly reduces, and the disturbance to slag interface has slowed down certainly.From figure 3, it can be seen that along with dam 1 continues
Move 200mm to stopper 2 direction, the area of pouring area molten steel " raceway zone " reduces further and almost disappears, but the most permissible
Although find out major part molten steel when molten steel flows to pouring area from lower retaining wall 4 bottom not with bigger speed vertical rush at slag
Interface, but the molten steel of big stock rushes at stopper 2 and slag interface intersection with an angle tilted upward, in the middle of scene
Wrap two angles of heel excessive, cause the cross section narrow space to involucrum sidewall at stopper 2 place, so the molten steel of big stock quickly touches
To involucrum sidewall, part molten steel can not be upheld as piston flow well, and this also causes the molten steel near sprue gate unstable.From figure
It can be seen that when dam 1 continues to move 200mm to stopper 2 direction, D value is reduced to 200mm, it can be seen that pouring area in 4
Molten steel occurs serious short-circuit flow and dead space volume to become big.Therefore, D value is preferred with 600mm, so can reduce pouring area
The molten steel that bigger molten steel " raceway zone " and alleviation are flowed out bottom the top retaining wall 3 undue disturbance to slag interface, the most also
It is unlikely to owing to dam 1 the most closely causes molten steel not have sufficient space develop into piston flow or short-circuit flow occur apart from sprue gate
Situation.
Owing to being analyzed finding by the result of digital-to-analogue, change the distance A value at the top retaining wall 4 bottom surface distance bag end to improvement
Pouring area molten steel " raceway zone " meaning is not very big, so A value still uses the 210mm of prototype tundish.
The lower-upper length and the pouring area molten steel that consider reduction pouring area molten steel " raceway zone " occur without substantial amounts of short
Lu Liu, so the height B value at the lower retaining wall 3 end face distance bag end uses 250mm to be advisable.
When determining the distance C value at top retaining wall 4 centre-to-centre spacing long nozzle 5 center, having carried out four groups of tests, C is respectively adopted
615mm, 595mm, 545mm these three value is simulated.In order to obtain longer mean residence time, and pouring area molten steel is relatively
Big piston flow volume, devise A1, A2, A3, A4 tetra-prescription case carry out comparative study, (A1 group, C value is result such as Fig. 5
The velocity field scattergram of molten steel during 615mm), Fig. 6 (A2 group, the velocity field scattergram of molten steel when C value is 595mm), Fig. 7 (A3 group,
The velocity field scattergram of molten steel when C value is 545mm), shown in Fig. 8 (A4 group, the thermo parameters method figure of molten steel when C value is 595mm).
From the digital-to-analogue result shown in several figures it is apparent that the distance C value worked as between top retaining wall 4 and long nozzle 5 is by prototype
When 645mm phases down as 615mm, 595mm, the mobility status of pouring area molten steel is taking a turn for the better, the most as shown in Figure 5,6.When C value
Less for the molten steel dead space volume of pouring area during 595mm, molten steel is the least to the disturbance of slag interface, as shown in Figure 6, and pouring area
Thermo parameters method the most visibly homogeneous, as shown in Figure 8.But when C value is reduced to 545mm further, pouring area molten steel flow
Situation starts to degenerate, and the most now the disturbance of slag interface has been increased by pouring area molten steel.Comprehensively examine
Considering mobility and the uniformity in temperature field of pouring area molten steel, C value selects 595mm to be preferred.
The a length of 2600-2700mm of described bottom.
The inclination angle of described involucrum left and right sides wall is 8 °.
Owing to tundish two angle of heel too conference causes the molten steel flowing to casting area from beam district to have little time full and uniform relaxing
Spread becomes piston flow the most quickly " to be kept off back " by tundish sidewall, is formed " raceway zone "；Further, bigger the inclining in tundish two side
Angle also can make casting area molten steel temperature the most uneven, and temperature drop is the biggest.So for tundish two angle of heel optimization according to
Prototype and empirical value devise 12 °, 8 ° of two kinds of different angles carry out comparative study, optimum results is shown in that (two angles of heel are 12 ° to Fig. 9
The velocity field scattergram of molten steel), Figure 10 velocity field scattergram of 8 ° of molten steel (two angles of heel be).By Fig. 9,10 can be clearly
Ground is found out, along with the reduction of tundish two angle of heel, increases left field space, sprue gate, significantly improves on the left of sprue gate
The mobility of molten steel, thus slow down the unstable situation of molten steel near the sprue gate caused due to narrow space.Simultaneously from figure
It can be seen that two angles of heel also slow down the disturbance to slag interface of the pouring area molten steel after using 8 ° in 10.Therefore, tundish two
Angle of heel uses 8 ° and is preferred.
The program of the present invention after optimizing, compared with prototype tundish, has a following effect:
1, in water model, water mean residence time in tundish increases by 26.4%, and dead space volume reduces 44.8%；After optimizing
Tundish be used for producing, then the molten steel dead band in tundish is reduced to 18.7% by original 33.9%, the molten steel in tundish
Time of staying increase is increased to 690.1s by original 546s, meanwhile, and the temperature fluctuation ＜ in tundish 5 DEG C.
2, the temperature homogeneity in tundish is greatly increased, temperature fluctuation ＜ 5 DEG C.
3, the casting strand oxygen content of tundish is reduced to 3ppm, later stage compared with the amplification of LF oxygen content by original 13ppm
Secondary pollution substantially reduces before relatively optimizing.
3, after optimizing, the stocking product sampling result of tundish is compared with the stocking product optimizing front tundish, field trash number
Amount significantly reduces, and major part is the fine foreign matter being smaller in size than 2 μm separated out in process of setting, is taking before not finding to optimize
The size observed in sample is more than the large inclusions of 5 μm.
4, after tundish comes into operation, Products decortication defect incidence rate is reduced to less than 1% by 2 ~ 3%.
Claims (8)
1. a special-shaped stainless steel continuous casting tundish, from left to right set gradually inside its involucrum dam (1), lower retaining wall (3), on
Barricade (4), turbulent flow suppressor (6), arrange stopper (2) in described dam (1), described turbulent flow suppressor (6) is provided above long water
Mouth (5), it is characterised in that: the distance (A) at described top retaining wall (4) the bottom surface distance bag end is 180-240mm, described lower retaining wall (3)
The height (B) at the end face distance bag end is 200-300mm, and the distance (C) at described top retaining wall (4) centre-to-centre spacing long nozzle (5) center is
550-640mm, the described lower retaining wall (3) distance (D) away from stopper (2) center is 550-650mm.
Special-shaped stainless steel continuous casting tundish the most according to claim 1, it is characterised in that: described top retaining wall (4) bottom surface away from
Distance (A) from the bag end is 210mm.
Special-shaped stainless steel continuous casting tundish the most according to claim 1, it is characterised in that: described lower retaining wall (3) end face away from
Height (B) from the bag end is 250mm.
Special-shaped stainless steel continuous casting tundish the most according to claim 1, it is characterised in that: described top retaining wall (4) centre-to-centre spacing
The distance (C) at long nozzle (5) center is 595mm.
Special-shaped stainless steel continuous casting tundish the most according to claim 1, it is characterised in that: described lower retaining wall (3) is away from stopper
(2) distance (D) at center is 600mm.
Special-shaped stainless steel continuous casting tundish the most according to claim 1, it is characterised in that: described involucrum left and right sides wall
Inclination angle is 6-10 °.
Special-shaped stainless steel continuous casting tundish the most according to claim 6, it is characterised in that: described involucrum left and right sides wall
Inclination angle is 8 °.
8. according to the special-shaped stainless steel continuous casting tundish described in claim 1,6 or 7, it is characterised in that: described bottom is long
Degree is 2600-2700mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117000985A (en) * | 2023-10-08 | 2023-11-07 | 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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| 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 |
| CN103990787A (en) * | 2014-05-16 | 2014-08-20 | 莱芜钢铁集团有限公司 | Device and method for removing molten steel slag inclusion in continuous casting tundish |
| CN104107905A (en) * | 2013-04-19 | 2014-10-22 | 宝钢特钢有限公司 | Slab continuous casting tundish |
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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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117000985A (en) * | 2023-10-08 | 2023-11-07 | 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106041042B (en) | 2018-11-30 |
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