CN211420274U - Crystallizer for metal electroslag remelting and electroslag remelting device - Google Patents
Crystallizer for metal electroslag remelting and electroslag remelting device Download PDFInfo
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- CN211420274U CN211420274U CN201922493551.7U CN201922493551U CN211420274U CN 211420274 U CN211420274 U CN 211420274U CN 201922493551 U CN201922493551 U CN 201922493551U CN 211420274 U CN211420274 U CN 211420274U
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 title claims abstract description 16
- 238000002425 crystallisation Methods 0.000 claims abstract description 30
- 230000008025 crystallization Effects 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000002844 melting Methods 0.000 claims abstract description 28
- 230000008018 melting Effects 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 238000003723 Smelting Methods 0.000 claims abstract description 24
- 210000001503 joint Anatomy 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 53
- 239000002893 slag Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 7
- 229910000997 High-speed steel Inorganic materials 0.000 description 20
- 229910000831 Steel Inorganic materials 0.000 description 10
- 238000005242 forging Methods 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a crystallizer and electroslag remelting device for metal electroslag remelting and an electroslag remelting method, which belong to the technical field of metal smelting. It has solved the problem that can not produce big specification electroslag ingot at present. The crystallizer for metal electroslag remelting comprises an upper crystallization chamber, a middle melting chamber and a lower crystallization chamber which are sequentially superposed from top to bottom, wherein the three crystallization chambers are respectively provided with an upper melting chamber, a middle melting chamber and a lower melting chamber which vertically penetrate through the respective corresponding crystallization chambers, the middle melting chamber is in an inverted cone shape, the large end of the middle melting chamber is in butt joint with the upper melting chamber, and the small end of the middle melting chamber is in butt joint with the lower melting chamber. The utility model discloses a solidified electroslag ingot is taken out from the crystallizer, does not influence the stability of whole electroslag process, directly carries out water-cooling to high temperature electroslag ingot, improves cooling rate. The special crystallizer structure can ensure that the temperature field of high-temperature molten pool slag is not influenced by the generated large cooling when the electroslag ingot is cooled by water, so that the electroslag remelting can be smoothly carried out.
Description
Technical Field
The utility model belongs to the technical field of metal smelting, a crystallizer and electroslag remelting device for metal electroslag remelting is related to.
Background
The high-speed steel is a high-alloy tool steel containing carbon (C), tungsten (W), molybdenum (Mo), chromium (Cr), vanadium (V), cobalt (Co) and other elements, has high heat resistance and high hardness after heat treatment, and has no obvious reduction of hardness when the use temperature is up to 600 ℃. The high-speed steel can be divided into common high-speed steel and high-performance high-speed steel according to chemical components, and is divided into smelting high-speed steel and powder metallurgy high-speed steel according to manufacturing processes, and the main production processes of the smelting high-speed steel comprise electric arc furnace smelting, electroslag remelting, forging, rolling and the like. The powder metallurgy high-speed steel is not produced at home due to high technical difficulty.
The main application area of high speed steel is the machinery and tool manufacturing industry, mainly for the manufacture of various cutting tools. Such as turning tools, drill bits, hobs, machine saw blades, and demanding molds. In recent years, a high-speed numerical control machine tool is generally adopted for machining, so that the hot hardness, the wear resistance and the impact toughness are good, high-speed steel bears great pressure and grinding action in working, the traditional high-speed steel has the advantages of good hot strength and poor plasticity and thermal fatigue property, the toughness is not easy to crack, the thermal conductivity is poor, and the service performance of the steel is seriously influenced, particularly large-specification (phi 60) high-speed steel, the carbide unevenness of the steel is poor, so that (M35) large-specification high-speed steel produced by most tool manufacturers in China is continuously made of imported materials. The development of high-performance and large-specification high-speed steel materials is listed in the thirteen-five basic material industrialization research and development catalogues of the department of science and technology.
After analysis and comparison, the results show that: the carbide unevenness of foreign high-speed steel (M35) phi 80 round steel is (3-4) grade, the carbide unevenness of domestic phi 80 round steel is (5-6) grade, other indexes are basically equivalent, and the determinant factor of the carbide unevenness is the forging ratio, the foreign high-speed steel is generally between 20 and 30, and the domestic high-speed steel is generally about 15. The forging ratio is determined by the size of the electroslag ingot, and the root cause that domestic manufacturers do not adopt large forging ratio is the limitation of an electroslag remelting process. Taking phi 80 round steel as an example, the diameter of an electroslag ingot of the round steel needs to be phi 370 according to 20 forging ratios. However, the domestic electroslag ingot of high-speed steel with a diameter of over 300 is slow in cooling speed and thick in cast structure, so the domestic production experience is that the service performance of large round steel produced by large ingot and large forging ratio is not as good as that of large round steel produced by medium ingot and medium forging ratio. The large electroslag ingot has a coarse as-cast structure, and the fundamental reason is that the ingot is large and is cooled slowly. Therefore, in order to produce high-performance large-specification high-speed steel, the process and equipment for electroslag remelting must be solved.
SUMMERY OF THE UTILITY MODEL
The first purpose of the utility model is to solve the above problems of the existing electroslag remelting and provide a crystallizer for metal electroslag remelting, which can produce large-scale electroslag ingots.
The first objective of the present invention can be achieved by the following technical solutions:
a crystallizer for electroslag remelting of metal is composed of upper crystallizing chamber, middle crystallizing chamber and lower crystallizing chamber, which are sequentially overlapped from top to bottom, and the three crystallizing chambers respectively have upper smelting cavity, middle smelting cavity and lower smelting cavity.
In foretell crystallizer for metal electroslag remelting, the crystallizer still include quick cooling device, this quick cooling device includes the shower of multilayer upper and lower range upon range of setting, the shower include shower and the interval set up a plurality of shower nozzles on corresponding the shower, a plurality of shower nozzles in the same shower encircle the setting.
In the crystallizer for metal electroslag remelting, the spray directions of the spray heads are all inwards and downwards inclined, the spray inclination angle of the spray head in the upper layer sprayer is the largest, and the spray inclination angle of the spray head in the bottom layer sprayer is the smallest. The more downward the angle is, the flatter.
In the crystallizer for metal electroslag remelting, the three crystallization chambers respectively comprise a crystallizer inner wall and a crystallizer outer wall, the crystallizer inner walls are enclosed into the respective corresponding crystallization chambers, a closed clearance space is formed between the crystallizer inner wall and the corresponding crystallizer outer wall, and the upper part and the lower part of each clearance space are respectively provided with a water outlet pipe and a water inlet pipe which are communicated with each other.
The second purpose of the utility model is to solve the above problems of the existing electroslag remelting and provide an electroslag remelting device capable of producing large electroslag ingots.
The second objective of the present invention can be achieved by the following technical solutions:
an electroslag remelting device comprises an upper upright post, an upper lifting arm, an upper lifting driving device, a chuck, a crystallizer, a bottom water tank, a lower upright post, a lower lifting driving device and a lower lifting arm, wherein the bottom water tank is fixedly connected with the lower lifting arm and is vertically opposite to an outlet at the lower end of the crystallizer, the lower lifting driving device drives the bottom water tank and the lower lifting arm to vertically lift along the lower upright post, the chuck is fixedly connected with the upper lifting arm and is vertically opposite to an inlet at the upper end of the crystallizer, the upper lifting driving device drives the upper lifting arm and the chuck to vertically lift along the upper upright post, the crystallizer is characterized by comprising an upper crystallization chamber, a middle melting chamber and a lower crystallization chamber which are sequentially overlapped from top to bottom, wherein the three crystallization chambers are respectively provided with an upper melting chamber, a middle melting chamber and a lower melting chamber which vertically penetrate through the corresponding crystallization chambers, the middle melting chamber is in an inverted cone shape, the large end of the middle melting chamber is in butt joint with the upper melting chamber, and the small end of the middle melting chamber is in butt joint with the lower melting chamber.
In the electroslag remelting device, the crystallizer further comprises a rapid cooling device, the rapid cooling device comprises a plurality of layers of spray throwers which are stacked up and down, each spray thrower comprises a spray pipe and a plurality of spray heads which are arranged on the corresponding spray pipe at intervals, and the plurality of spray heads in the same spray thrower are arranged in a surrounding mode.
In the electroslag remelting device, the spray directions of the spray heads are all inwards and downwards inclined, the spray inclination angle of the spray head in the upper layer sprayer is the largest, and the spray inclination angle of the spray head in the bottom layer sprayer is the smallest. The more downward the angle is, the flatter.
In the electroslag remelting device, the three crystallization chambers respectively comprise a crystallizer inner wall and a crystallizer outer wall, the crystallizer inner walls are enclosed into the respective corresponding crystallization chambers, a closed gap space is formed between the crystallizer inner wall and the corresponding crystallizer outer wall, and a water outlet pipe and a water inlet pipe which are communicated are respectively arranged at the upper part and the lower part of each gap space.
Compared with the prior art, the utility model discloses a solidified electroslag ingot is taken out from the crystallizer, does not influence the stability of whole electroslag process, directly carries out water-cooling to high temperature electroslag ingot, improves cooling rate. The special crystallizer structure can ensure that the temperature field of high-temperature molten pool slag is not influenced by the generated large cooling when the electroslag ingot is cooled by water, so that the electroslag remelting can be smoothly carried out.
Drawings
FIG. 1 is a schematic view of an electroslag remelting apparatus.
FIG. 2 is a schematic view of the structure of the crystallizer.
In the figure, 1, an upper upright post; 2. an upper lifting arm; 3. a lower upright post; 4. a chuck; 5. a crystallizer; 6. a bottom water tank; 7. an upper crystallization chamber; 8. a middle crystallization chamber; 9. a lower crystallization chamber; 10. a slag pool; 11. a molten pool; 12. an electrode rod; 13. a lower lifting arm; 14. and (4) a spray head.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1, the electroslag remelting device comprises an upper upright post, an upper lifting arm, an upper lifting driving device, a chuck, a crystallizer, a bottom water tank, a lower upright post, a lower lifting driving device and a lower lifting arm, wherein the bottom water tank is fixedly connected with the lower lifting arm and is vertically opposite to an outlet at the lower end of the crystallizer, the lower lifting driving device drives the bottom water tank and the lower lifting arm to vertically lift along the lower upright post, the chuck is fixedly connected with the upper lifting arm and is vertically opposite to an inlet at the upper end of the crystallizer, and the upper lifting driving device drives the upper lifting arm and the chuck to vertically lift along the upper upright post.
As shown in fig. 2, the crystallizer includes an upper crystallization chamber, a middle crystallization chamber and a lower crystallization chamber which are sequentially stacked from top to bottom, the three crystallization chambers respectively have an upper smelting chamber, a middle smelting chamber and a lower smelting chamber which respectively penetrate through the respective crystallization chambers from top to bottom, the middle smelting chamber is in an inverted cone shape, the large end of the middle smelting chamber is in butt joint with the upper smelting chamber, and the small end of the middle smelting chamber is in butt joint with the lower smelting chamber.
The crystallizer is characterized by further comprising a rapid cooling device, the rapid cooling device comprises a plurality of layers of sprayers which are arranged in an up-down stacked mode, each sprayer comprises a spraying pipe and a plurality of spray heads which are arranged on the corresponding spraying pipe at intervals, and the plurality of spray heads in the same sprayer are arranged in a surrounding mode.
The spraying direction of shower nozzle all inwards the downward sloping setting, and the spray inclination of shower nozzle is the biggest in the upper spray thrower, and the spray inclination of shower nozzle is minimum in the bottom spray thrower. The more downward the angle is, the flatter.
The three crystallization chambers comprise inner walls of the crystallizers and outer walls of the crystallizers, the inner walls of the crystallizers enclose the corresponding crystallization chambers, closed clearance spaces are formed between the inner walls of the crystallizers and the corresponding outer walls of the crystallizers, and the upper parts and the lower parts of the clearance spaces are respectively provided with a water outlet pipe and a water inlet pipe which are communicated with each other.
A metal electroslag remelting method comprises the following steps: the electroslag remelting device is utilized for carrying out the electroslag remelting method, and the electroslag remelting device comprises the following steps:
1: and (3) annealing the electrode bar, and eliminating partial stress (the holding temperature is 830 ℃, the time is 5-7 h, and the charging method has no requirement).
2: and sanding the electrode bar to ensure that the surface is basically polished, and removing the defects of oxidation, cracks and the like on the surface.
3: welding the electrode bar with a false electrode:
cleaning an electrode bar before welding: cleaning into a plane to ensure conductivity
Welding method & position: the dummy electrode and the electrode bar are ensured to be in a straight line.
4: reasonable slag charge proportion is selected (the slag charge meets the requirements of moderate conductivity gamma, high boiling point, low melting point, good chemical stability, small viscosity and specific surface tension sigma through the proportion of a quaternary slag system).
5: baking slag (requirement: slag material composition meets the requirement, purity and impurity free, proper granularity)
Equipment: box type resistance furnace
The process comprises the following steps: baking temperature 550 ℃, time: and (5) 24 h.
6: slagging (Current: 600A, slag amount of each slagging furnace: determined according to the amount)
7: clamping the electrode: the clamp is required to clamp positively, the contact surface is polished completely during clamping, and the connecting bolt of the conductive part is detected to ensure no looseness or poor contact.
8: preparing a crystallizer, a quick cooling device, a dummy bar plate and a bottom water tank: the quick cooling device is arranged below the crystallizer, the bottom water tank panel must be kept horizontal, and the bolt for fixing the dummy bar plate is coated with conductive paste and screwed into the threaded hole of the bottom water tank.
9: and lifting the bottom water tank to the center of the crystallizer, and sealing the edge of the bottom water tank by adding an asbestos rope.
10: and (3) lowering the electrode bar to a reasonable height of the center of the crystallizer, putting slag into the crystallizer, determining the amount of slag according to the size of the electrode bar, and simultaneously starting the quick cooling device.
11: and (3) switching on the current, firstly increasing the temperature of the slag, and starting smelting after the temperature of the slag is increased to a reasonable temperature.
12: fast cooling and ingot drawing: the height of the liquid level on the inner wall of the crystallizer is controlled by adjusting the smelting current, voltage and ingot drawing speed, so that the reasonable proportion of the ingot drawing speed and the smelting speed is ensured, and the problems of overflow of molten steel from the upper part of the crystallizer, difficult ingot drawing or steel leakage and the like are prevented; the cooling speed of the remelting electroslag ingot is controlled by controlling the water pressure of the quick cooling device, and the high-speed steel is prevented from cracking due to insufficient cooling speed or too high cooling speed in the smelting process.
13: after smelting is finished, power and water are cut off, the electroslag ingot is unloaded and placed into a box type resistance furnace for heat preservation, and cracking is prevented in the subsequent cooling process.
14: annealing: complete annealing, reducing stress and regulating hardness
15: sanding and removing surface scale
Forging: and forging the electroslag ingot and processing into various forgings.
Rolling: after the forged rolling blank is rolled, hot rolling or cold rolling is carried out to obtain rolling materials with various specifications.
It is to be understood that in the claims, the specification of the present invention, all "including … …" are to be interpreted in an open-ended manner, i.e. in a manner equivalent to "including at least … …", and not in a closed manner, i.e. in a manner not to be interpreted as "including … … only".
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (8)
1. A crystallizer for electroslag remelting of metal is composed of upper crystallizing chamber, middle crystallizing chamber and lower crystallizing chamber, which are sequentially overlapped from top to bottom, and the three crystallizing chambers respectively have upper smelting cavity, middle smelting cavity and lower smelting cavity.
2. The crystallizer for electroslag remelting of metal according to claim 1, wherein the crystallizer further comprises a rapid cooling device, the rapid cooling device comprises a plurality of layers of sprayers which are stacked up and down, each sprayer comprises a spray pipe and a plurality of spray heads which are arranged on the corresponding spray pipe at intervals, and the plurality of spray heads in the same sprayer are arranged in a surrounding manner.
3. The crystallizer for electroslag remelting of metal according to claim 2, wherein the spray nozzles are arranged in such a way that the spray directions are inclined inward and downward, the spray nozzles in the upper layer of spray thrower have the largest spray inclination angle, and the spray nozzles in the bottom layer of spray thrower have the smallest spray inclination angle.
4. A crystallizer as claimed in claim 1, 2 or 3, wherein each of the three crystallization chambers includes an inner crystallizer wall and an outer crystallizer wall, the inner crystallizer walls define respective corresponding crystallization chambers, a closed gap space is formed between the inner crystallizer wall and the corresponding outer crystallizer wall, and the upper and lower parts of each gap space are respectively provided with a water outlet pipe and a water inlet pipe which are communicated with each other.
5. An electroslag remelting device comprises an upper upright post, an upper lifting arm, an upper lifting driving device, a chuck, a crystallizer, a bottom water tank, a lower upright post, a lower lifting driving device and a lower lifting arm, wherein the bottom water tank is fixedly connected with the lower lifting arm and is vertically opposite to an outlet at the lower end of the crystallizer, the lower lifting driving device drives the bottom water tank and the lower lifting arm to vertically lift along the lower upright post, the chuck is fixedly connected with the upper lifting arm and is vertically opposite to an inlet at the upper end of the crystallizer, the upper lifting driving device drives the upper lifting arm and the chuck to vertically lift along the upper upright post, the crystallizer is characterized by comprising an upper crystallization chamber, a middle melting chamber and a lower crystallization chamber which are sequentially overlapped from top to bottom, wherein the three crystallization chambers are respectively provided with an upper melting chamber, a middle melting chamber and a lower melting chamber which vertically penetrate through the corresponding crystallization chambers, the middle melting chamber is in an inverted cone shape, the large end of the middle melting chamber is in butt joint with the upper melting chamber, and the small end of the middle melting chamber is in butt joint with the lower melting chamber.
6. The electroslag remelting device according to claim 5, wherein the crystallizer further comprises a rapid cooling device, the rapid cooling device comprises a plurality of layers of spray headers which are stacked up and down, each spray header comprises a spray pipe and a plurality of spray heads which are arranged on the corresponding spray pipe at intervals, and the plurality of spray heads in the same spray header are arranged in a surrounding manner.
7. The electroslag remelting device according to claim 6, wherein the spray heads are arranged in such a way that the spray directions are inclined inward and downward, the spray head in the upper layer of spray thrower has the largest spray inclination angle, and the spray head in the lower layer of spray thrower has the smallest spray inclination angle.
8. An electroslag remelting device according to claim 5, 6 or 7, wherein each of the three crystallization chambers comprises an inner wall of the crystallizer and an outer wall of the crystallizer, the inner walls of the crystallizers surround the corresponding crystallization chamber, a closed gap space is formed between the inner wall of the crystallizer and the corresponding outer wall of the crystallizer, and the upper part and the lower part of each gap space are respectively provided with a water outlet pipe and a water inlet pipe which are communicated with each other.
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| CN201922493551.7U CN211420274U (en) | 2019-12-31 | 2019-12-31 | Crystallizer for metal electroslag remelting and electroslag remelting device |
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| CN201922493551.7U CN211420274U (en) | 2019-12-31 | 2019-12-31 | Crystallizer for metal electroslag remelting and electroslag remelting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118302A (en) * | 2019-12-31 | 2020-05-08 | 浙江正达模具有限公司 | Crystallizer for metal electroslag remelting, electroslag remelting device and electroslag remelting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118302A (en) * | 2019-12-31 | 2020-05-08 | 浙江正达模具有限公司 | Crystallizer for metal electroslag remelting, electroslag remelting device and electroslag remelting method |
| WO2021135223A1 (en) * | 2019-12-31 | 2021-07-08 | 浙江正达模具有限公司 | Crystallizer for metal electroslag remelting, electroslag remelting device and electroslag remelting method |
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