CN109648068A - A kind of induction heating tundish ladle canal and its means of defence - Google Patents
A kind of induction heating tundish ladle canal and its means of defence Download PDFInfo
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- CN109648068A CN109648068A CN201910085136.XA CN201910085136A CN109648068A CN 109648068 A CN109648068 A CN 109648068A CN 201910085136 A CN201910085136 A CN 201910085136A CN 109648068 A CN109648068 A CN 109648068A
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- Prior art keywords
- backplate
- ladle canal
- canal
- ladle
- induction heating
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 230000006698 induction Effects 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 238000009749 continuous casting Methods 0.000 claims abstract description 19
- 230000001771 impaired effect Effects 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims abstract description 7
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 239000003063 flame retardant Substances 0.000 claims description 11
- 239000011819 refractory material Substances 0.000 claims description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 239000011449 brick Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 4
- 238000005266 casting Methods 0.000 description 5
- 208000002925 dental caries Diseases 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001051 Magnalium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- 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
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
-
- 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
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The present invention provides a kind of induction heating tundish ladle canal and its means of defence, and ladle canal is located at the bottom of the partition wall of induction heating tundish, and the left side of ladle canal is connected to flood chamber, and the right side of ladle canal is connected to distributor chamber；Ladle canal is inclined to set, ladle canal is higher than close to the side of flood chamber close to the side of distributor chamber, the both ends of ladle canal provided by the invention are equipped with backplate, it avoids during continuous casting steel machine, ladle canal is continuously washed away by high-temperature molten steel, channel end surface easily corrodes, is impaired, the phenomenon for causing the out-of-flatness of ladle canal end face even damaged；The invention enables ladle canal end faces simultaneously is tightly combined with bakie working lining, it is therefore prevented that molten steel flows into gap and causes the phenomenon that seeping steel accident；The service life for improving ladle canal ensure that the safety of continuous casting cast steel process.
Description
Technical field
The invention belongs to metallurgical steelmaking equipment technical fields, and in particular to a kind of induction heating tundish ladle canal and its
Means of defence.
Background technique
In recent years, with the progress of continuous casting technology, tundish can be realized as a storage molten steel and reaction vessel
Additional metallurgical function plays increasingly important role in continuous casting technology.Production practices show to control steel in tundish
The water degree of superheat can be effectively improved solidified structure, improve product quality.The constant temperature casting pair of low overheat during continuous casting steel machine
It obtains good slab quality and stable operation is extremely important, channel-type induction heating tundish can effectively compensate for intermediate Baogang
Water temperature drops and keeps its temperature uniform, while can effectively improve molten steel cleanliness in tundish and reduce non-metallic inclusion.
During continuous casting steel machine, ladle canal is continuously washed away by high-temperature molten steel, channel end surface easily corrodes, by
Damage causes end face out-of-flatness even damaged, on the one hand can reduce channel lifetime, on the other hand influence the block quality of tundish,
End face does not cause closely molten steel to flow into gap in conjunction with bakie working lining and causes steel accident of seeping, and can generate ladle canal
Service life is not high and there is a certain security risk.
Accordingly, it is desirable to provide it is a kind of for a kind of insufficient induction heating tundish ladle canal of the above-mentioned prior art and its
Means of defence.
Summary of the invention
The purpose of the present invention is to provide a kind of induction heating tundish ladle canals and its means of defence at least to solve
At present during continuous casting steel machine, ladle canal is continuously washed away by high-temperature molten steel, and channel end surface easily corrodes, is impaired, is made
At the technical problem that end face out-of-flatness is even damaged.
To achieve the goals above, the invention provides the following technical scheme:
A kind of induction heating tundish ladle canal, the ladle canal are located at the bottom of the partition wall of induction heating tundish
Portion, the left side of the ladle canal are connected to flood chamber, and the right side of the ladle canal is connected to distributor chamber；The ladle canal is in incline
Tiltedly setting, the ladle canal are higher than close to the side of the flood chamber close to the side of the distributor chamber.
A kind of induction heating tundish ladle canal as described above, it is preferable that the left end of the ladle canal is equipped with the
One backplate；The right end of the ladle canal is equipped with the second backplate；It is opened up centered on first backplate and second backplate are equal
Round-meshed cuboid thin plate；The length and width of first backplate and second backplate is equal to the ladle canal
Length and width；The diameter and present position of first backplate and the circular hole on second backplate and the ladle canal
The diameter of access opening and present position are identical.
A kind of induction heating tundish ladle canal as described above, it is preferable that set on the medial surface of the ladle canal
There is flame retardant coating, the flame retardant coating is laid on the surrounding of the access opening；The inner sidewall upper berth of the flood chamber and the distributor chamber
Equipped with flame retardant coating.
A kind of induction heating tundish ladle canal as described above, it is preferable that be additionally provided with below the ladle canal
Channel brick.
A kind of induction heating tundish ladle canal as described above, it is preferable that the ladle canal is with respect to the horizontal plane
Tilt angle be 10~30 °.
A kind of induction heating tundish ladle canal as described above, it is preferable that first backplate and second shield
Plate with a thickness of 30~50mm.
The means of defence of induction heating tundish ladle canal as described above, it is preferable that the means of defence includes such as
Lower step:
Step 1 makes backplate with refractory material, and according to the end face length and width of ladle canal, backplate is cut into
First backplate and the second backplate；And circular hole, the diameter of circular hole and present position and stream are opened up on the first backplate and the second backplate
The diameter of the access opening in steel channel and present position are identical；
First backplate is fitted in the left end of ladle canal, by the second backplate when building induction heating tundish processed by step 2
It is fitted in the right end of ladle canal；
Step 3, during continuous casting steel machine, the first backplate and the second backplate bear directly washing away for high-temperature molten steel；
Step 4 after continuous casting steel machine, clears up the steel scrap at ladle canal both ends；
Step 5 after the completion of the cleaning of ladle canal steel scrap, removes the impaired backplate in both ends, more renews shield when building processed next time
Plate.
A kind of means of defence of induction heating tundish ladle canal as described above, it is preferable that resistance in the step 1
Fiery material is one of magnesia refractories or refractory magnesia-alumina material.
Compared with the immediate prior art, technical solution provided by the invention has following excellent effect:
The both ends of ladle canal provided by the invention be equipped with backplate, avoid during continuous casting steel machine, ladle canal by
To continuously washing away for high-temperature molten steel, channel end surface easily corrodes, is impaired, causes the out-of-flatness of ladle canal end face is even damaged to show
As；The invention enables ladle canal end faces simultaneously is tightly combined with bakie working lining, it is therefore prevented that molten steel flows into gap and causes infiltration
The phenomenon that steel accident；The service life for improving ladle canal ensure that the safety of continuous casting cast steel process.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.Wherein:
Fig. 1 is the usage state diagram of the ladle canal of the embodiment of the present invention；
Fig. 2 is the top view of the induction heating tundish of the embodiment of the present invention.
In figure: 1, flood chamber；2, distributor chamber；3, the first backplate；4, the second backplate；5, access opening；6, flame retardant coating；7, turbulent flow
Suppressor；8, submersed nozzle；9, partition wall；10, channel brick.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that in the feelings not conflicted
Under condition, the features in the embodiments and the embodiments of the present application be can be combined with each other.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the present invention rather than require the present invention that must be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.Term used in the present invention " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected,
It may be a detachable connection；It can be directly connected, can also be indirectly connected by intermediate member, for the common of this field
For technical staff, the concrete meaning of above-mentioned term can be understood as the case may be.
According to a particular embodiment of the invention, as shown in Figure 1, induction heating tundish by refractory material laying at two chambers
Body, the cavity in left side are flood chambers 1, i.e., the region of big packet long nozzle molten steel injection tundish, it is logical that the purpose is to Shi great Baogang water
It crosses after long nozzle enters tundish and is buffered, large inclusions rising has certain space.Another chamber positioned at right side
Body is distributor chamber 2, i.e., each 8 pour steel of submersed nozzle is flowed into the region of crystallizer, and the purpose is to pass through ladle canal
The molten steel being warmed has certain residence time after being entered distributor chamber 2 by the pinch effect in channel, makes the temperature of pour steel
Degree and ingredient uniformly, flow speed stability.By installing inductor inside the partition wall 9 of refractory material laying, stream is arranged in the periphery of inductor
Steel channel, two cavitys are connected by ladle canal and are penetrated through.
According to a particular embodiment of the invention, ladle canal is arranged in 9 bottom of tundish partition wall, makes molten steel from injection region
The arrangement for flowing into pouring area channel is that molten steel flow field is rational main in the heating efficiency and tundish for influence heater
Factor.Therefore, the bottom of two chambers is designed as not in same level, depth is different, volume is different.Flood chamber 1 it is big
It is small there is no particular/special requirement, it is cached in flood chamber 1 as long as being able to satisfy the molten steel that the big packet long nozzle of this project flows into, and can be with
Can smoothly enter into ladle canal, and after flow straightener is installed molten steel the no dead zone of flowing；In the design and tradition of distributor chamber 2
Between wrap design requirement it is identical, cavity it is necessary to depth, there is a certain distance at the mouth of a river away from side wall.Two cavitys are designed as infusing
Entering the room, 1 depth as shallow, volume are small, and 2 depth of distributor chamber is deep, volume is big.The volume size of two cavitys must according to different fluxion and
Steel -passing amount determines, also depends on the quantity of inductor setting and using channel by the way of, the volume of general flood chamber 1 about divides
One third or so with 2 volume of room.According to a particular embodiment of the invention, as shown in Fig. 2, turbulent flow suppressor 7 is located at injection
In room 1, the impact of molten steel is flowed into for resisting big packet long nozzle, stablize in wrap in impact zone MOLTEN STEEL FLOW, improve tundish note
It enters the room molten steel flow field in 1, promotes inclusion floating, prevent spray gradually.Submersed nozzle 8 is located in distributor chamber 2, and between any two between
Every a certain distance.
According to a particular embodiment of the invention, a kind of induction heating tundish ladle canal, ladle canal are located at induction and add
The bottom of the partition wall 9 of hot tundish, the left side of ladle canal are connected to flood chamber 1, and the right side of ladle canal is connected to distributor chamber 2；Stream
Steel channel is inclined to set, and cuts tiltedly setting convenient for molten steel and smoothly flows into distributor chamber 2 from flood chamber 1, and ladle canal is logical
Noresidue in road hole 5.Ladle canal is higher than close to the side of flood chamber 1 close to the side of distributor chamber 2, utilizes the weight of molten steel itself
It tries hard to keep and demonstrate,proves the flowing of molten steel.The tilt angle of ladle canal with respect to the horizontal plane be 10~30 ° (such as 12 °, 14 °, 18 °, 22 °,
24°、26°、28°、30°)。
According to a particular embodiment of the invention, the left end of ladle canal is equipped with the first backplate 3；The right end of ladle canal is equipped with
Second backplate 4；The cuboid thin plate of circular hole is offered centered on first backplate 3 and the second backplate 4 are equal；First backplate 3 and second
The length and width of backplate 4 is equal to the length and width of ladle canal；First backplate 3 and the circular hole on the second backplate 4 it is straight
Diameter and present position are identical as the diameter of the access opening 5 of ladle canal and present position.Backplate is avoided in continuous casting steel machine process
In, ladle canal is continuously washed away by high-temperature molten steel, and channel end surface easily corrodes, is impaired, causes ladle canal end face uneven
Whole or even damaged phenomenon；Simultaneously ladle canal end face is tightly combined with bakie working lining, it is therefore prevented that molten steel flows into empty
Gap causes the phenomenon that seeping steel accident；Improve the service life of ladle canal.It ensure that the safety of continuous casting cast steel process.First backplate
3 and second backplate 4 with a thickness of 30~50mm (such as 32mm, 34mm, 38mm, 40mm, 42mm, 45mm, 46mm, 48mm, 50mm)
According to a particular embodiment of the invention, ladle canal includes flame retardant coating 6, and flame retardant coating 6 is laid on the four of access opening 5
Week；The inner surface of flood chamber 1 and distributor chamber 2 also is provided with flame retardant coating 6；Flame retardant coating 6 effectively avoids impact of the molten steel to shell.
According to a particular embodiment of the invention, channel brick 10 is additionally provided with below ladle canal；Brick 10 convection current steel in channel is logical
It plays a supporting role in road.
In addition to this, the present invention also provides a kind of means of defence of induction heating tundish ladle canal, means of defences
Include the following steps:
Step 1 makes of magnalium matter (refractory magnesia-alumina material could alternatively be magnesia refractories) refractory material and protects
Plate, and according to the end face length and width of ladle canal, backplate is cut into the first backplate 3 and the second backplate 4；And in the first shield
Circular hole is beaten on plate 3 and the second backplate 4；The diameter of the access opening 5 of the diameter of guarantee circular hole and present position and ladle canal and institute
It is identical to locate position.
First backplate is fitted in the left end of ladle canal, by the second backplate when building induction heating tundish processed by step 2
4 are fitted in the right end of ladle canal.
Step 3, during continuous casting steel machine, the first backplate and the second backplate energy effective protection positioned at ladle canal both ends
Two end faces of ladle canal are not washed away directly by high-temperature molten steel.
Step 4 after continuous casting steel machine, when staff clears up ladle canal both ends steel scrap with oxygen rifle, flows steel
The end face in channel has been protected from the direct impact of thermal-flame by backplate, mitigates the erosion at channel both ends.
Step 5 after the completion of the cleaning of ladle canal steel scrap, removes the impaired backplate in both ends, more renews shield when building processed next time
Plate improves channel service life, improves the block quality of tundish.
To sum up, the both ends of ladle canal provided by the invention are equipped with backplate, avoid during continuous casting steel machine, and stream steel is logical
Road is continuously washed away by high-temperature molten steel, and channel end surface easily corrodes, is impaired, causes the out-of-flatness of ladle canal end face even damaged
The phenomenon that；The invention enables ladle canal end faces simultaneously is tightly combined with bakie working lining, it is therefore prevented that molten steel flows into gap and draws
Hair seeps the phenomenon that steel accident；Improve the service life of ladle canal.It ensure that the safety of continuous casting cast steel process.
The bottom of flood chamber is designed to that the another advantage for being shallower than casting room bottom is, it is complete that residual molten steel is cast after casting
Portion enters in casting room, without residual molten steel in channel.The shape of channel brick inner cavity, ladle canal inner wall are on the one hand protected in this way
Secondary use is carried out after simply clearing up, and saves refractory consumption rate, it is time saving and energy saving；On the other hand it can reduce more than casting, improve
Recovery rate of iron.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of induction heating tundish ladle canal, which is characterized in that the ladle canal is located at induction heating tundish
The bottom of partition wall, the left side of the ladle canal are connected to flood chamber, and the right side of the ladle canal is connected to distributor chamber；The stream steel
Channel is inclined to set, and the ladle canal is higher than close to the side of the flood chamber close to the side of the distributor chamber.
2. a kind of induction heating tundish ladle canal as described in claim 1, which is characterized in that a left side for the ladle canal
End is equipped with the first backplate；The right end of the ladle canal is equipped with the second backplate；First backplate and second backplate are
Center opens up round-meshed cuboid thin plate；The length and width of first backplate and second backplate is equal to the stream
The length and width in steel channel；The diameter and present position and the stream of first backplate and the circular hole on second backplate
The diameter of the access opening in steel channel and present position are identical.
3. a kind of induction heating tundish ladle canal as claimed in claim 2, which is characterized in that the ladle canal it is interior
Side is equipped with flame retardant coating, and the flame retardant coating is laid on the surrounding of the access opening；The flood chamber and the distributor chamber it is interior
Flame retardant coating is equipped on side wall.
4. a kind of induction heating tundish ladle canal as described in claim 1, which is characterized in that under the ladle canal
Side is additionally provided with channel brick.
5. a kind of induction heating tundish ladle canal as described in claim 1, which is characterized in that the ladle canal is opposite
In horizontal plane tilt angle be 10~30 °.
6. a kind of induction heating tundish ladle canal as claimed in claim 2, which is characterized in that first backplate and institute
State the second backplate with a thickness of 30~50mm.
7. a kind of means of defence of such as described in any item induction heating tundish ladle canals of Claims 1-4, feature exist
In the means of defence includes the following steps:
Step 1 makes backplate with refractory material, and according to the end face length and width of ladle canal, backplate is cut into first
Backplate and the second backplate；And circular hole is opened up on the first backplate and the second backplate, the diameter of circular hole and present position and stream steel lead to
The diameter of the access opening in road and present position are identical；
First backplate is fitted in the left end of ladle canal when building induction heating tundish processed by step 2, and the second backplate is bonded
In the right end of ladle canal；
Step 3, during continuous casting steel machine, the first backplate and the second backplate bear directly washing away for high-temperature molten steel；
Step 4 after continuous casting steel machine, clears up the steel scrap at ladle canal both ends；
Step 5 after the completion of the cleaning of ladle canal steel scrap, removes the impaired backplate in both ends, more renews backplate when building processed next time.
8. a kind of means of defence of induction heating tundish ladle canal as claimed in claim 7, which is characterized in that the step
In rapid one, refractory material is one of magnesia refractories or refractory magnesia-alumina material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910085136.XA CN109648068B (en) | 2019-01-29 | 2019-01-29 | Induction heating tundish steel flow channel and protection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910085136.XA CN109648068B (en) | 2019-01-29 | 2019-01-29 | Induction heating tundish steel flow channel and protection method thereof |
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| Publication Number | Publication Date |
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| CN109648068A true CN109648068A (en) | 2019-04-19 |
| CN109648068B CN109648068B (en) | 2024-06-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110052596A (en) * | 2019-05-27 | 2019-07-26 | 东北大学 | Butterfly induction heating tundish |
| CN112371969A (en) * | 2020-10-20 | 2021-02-19 | 青岛正望钢水控制股份有限公司 | Implementation method of functional refractory material of channel type electromagnetic induction heating tundish |
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| CN204770627U (en) * | 2015-06-30 | 2015-11-18 | 辽宁科技大学 | Packing is put in middle of single current passageway formula induction heating bend pipe type passageway |
| CN204912739U (en) * | 2015-08-07 | 2015-12-30 | 辽宁科技大学 | Middle packing is put with streamlined lateral wall |
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| CN209647582U (en) * | 2019-01-29 | 2019-11-19 | 大冶特殊钢股份有限公司 | A kind of induction heating tundish ladle canal |
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| CN110052596B (en) * | 2019-05-27 | 2021-03-26 | 东北大学 | Butterfly type induction heating tundish |
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| CN112371969B (en) * | 2020-10-20 | 2021-09-24 | 青岛正望钢水控制股份有限公司 | Implementation method of functional refractory material of channel type electromagnetic induction heating tundish |
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