CN115815551A - Crucible for up-drawing continuous casting furnace and casting process thereof - Google Patents
Crucible for up-drawing continuous casting furnace and casting process thereof Download PDFInfo
- Publication number
- CN115815551A CN115815551A CN202211615197.0A CN202211615197A CN115815551A CN 115815551 A CN115815551 A CN 115815551A CN 202211615197 A CN202211615197 A CN 202211615197A CN 115815551 A CN115815551 A CN 115815551A
- Authority
- CN
- China
- Prior art keywords
- area
- copper
- furnace
- crucible
- continuous casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of up-drawing continuous casting, and relates to a crucible for an up-drawing continuous casting furnace, which comprises a hearth body made of graphite, wherein two partition walls are arranged in the hearth body and used for dividing the hearth body into a charging area, a standing area and a guide rod area; the bottom ends of the two partition walls are provided with openings, and filtering devices are arranged in the openings; a choke wall is arranged at the bottom of the standing area, and the upper end of the choke wall is lower than the separation wall; the top end of the guide rod area is provided with a crystallizer. The effective channel length of the copper liquid in the hearth is increased, the alloy elements in the hearth are fully diffused, and the segregation in the casting process is avoided; the addition of the flow blocking wall in the standing area increases the contact between the molten copper and the graphite furnace wall, and further reduces the oxygen content in the molten copper; the copper liquid shape stroke is increased, thereby being more beneficial to scum and exhaust and avoiding slag from being rolled into the casting rod; the feeding area, the standing area and the guide rod area are connected through the filtering device, so that the influence of the fluctuation of the liquid level of the feeding area on the liquid level of the guide rod area in the production process can be effectively avoided.
Description
Technical Field
The invention belongs to the technical field of upward continuous casting, and particularly relates to a crucible for an upward continuous casting furnace and a casting process thereof.
Background
The upward continuous casting process has the characteristics of mature process technology, lower unit energy consumption, flexible and various production varieties and specifications, strong adaptability, no three-waste pollution, less investment and the like, and is an ideal process for processing copper conductors and copper materials. At present, the upward continuous casting process is widely applied to the copper processing industry. But its drawbacks are gradually exposed as the copper processing industry progresses toward miniaturization.
The raw material adopted is cathode copper generally, and because the raw material per se or the raw material is stored, substances containing sulfur, hydrogen elements, verdigris and the like are often contained on the surface, hydrogen, oxygen and sulfur are decomposed in the smelting process and are dissolved in the molten copper in a large amount, so that the impurity content in the molten copper is increased, and simultaneously, the impurities are easily separated out and form air holes during crystallization, and the wire breakage is easily caused in the finish machining process.
The common upward furnace generally comprises a melting furnace, a standing transition bin and a heat preservation furnace, and the upward furnace also comprises a melting furnace and a heat preservation furnace, so that the phenomenon of large temperature fluctuation in the melting process can occur, the formation of a stable copper rod crystallization environment is not facilitated, and the gas separation and impurity suspension removal are also not facilitated. The influence of the process smelting temperature on the contents of H and O elements in the copper liquid is large, because the equilibrium constant K is related to the temperature, the concentration product of the H and O elements is increased along with the increase of the equilibrium constant, and the gas content in the copper liquid is also increased. In addition, the temperature in the copper liquid is too high, the copper rod crystals become coarse, the formed structure is loose, a series of defects such as shrinkage cavities and air holes are easy to generate, and H and O elements are easy to absorb from the air; on the contrary, the temperature in the copper liquid is too low, so that the fluidity of the copper liquid is poor, and the appearance of the copper rod is easy to generate defects such as cold shut, cracks and the like.
During up-drawing continuous casting, crystalline flake graphite is added as a covering agent and an oxygen scavenger, and oxides (CuO, RO and the like) are easily generated with impurities at high temperature along with the continuous addition of a cathode copper plate and alloy elements in the up-drawing continuous casting process. Such oxides tend to harden with the crystalline flake graphite to form large chunks of slag, which contain a large amount of semi-molten copper. Such slag should be removed in time, otherwise, the covering and oxygen removing effects are reduced, and the large slag also causes difficulty in adding the cathode copper plate and the alloy elements. The slag mainly contains copper oxide, magnesium oxide, tin oxide and silver oxide, and besides, a large amount of copper slag.
Based on the current situation, the process for reducing the defects of the cast rod prepared by the up-drawing continuous casting process has very wide practical significance and commercial value.
Disclosure of Invention
The invention aims to provide a crucible for an up-drawing continuous casting furnace and a casting process thereof, which solve the problems of various defects in the prior art.
The invention is realized by the following technical scheme:
a crucible for an up-drawing continuous casting furnace comprises a hearth body made of graphite, wherein two partition walls are arranged in the hearth body and used for dividing the hearth body into a charging area, a standing area and a guide rod area;
the bottom ends of the two partition walls are provided with openings, and filtering devices are arranged in the openings;
a choke wall is arranged at the bottom of the standing area, and the upper end of the choke wall is lower than the separation wall;
the top end of the guide rod area is provided with a crystallizer.
Further, the filtering device is a graphite filter screen.
Furthermore, a filter screen is arranged at the inlet of the crystallizer.
Further, the crystallizer includes graphite jig and the block of setting in the graphite jig bottom.
Further, the depth of the hearth body is 1000-1500 mm;
the length of a furnace mouth of the charging area is 800-1000 mm, and the width is 200-250 mm;
the length of a furnace mouth of the standing area is 800-1000 mm, the width is 300-500 mm, and the height of a flow-resisting wall is 300-500 mm;
the length of the furnace mouth of the guide rod area is 800-1000 mm, and the width is 200-250 mm.
The invention also discloses a casting process of the crucible for the up-drawing continuous casting furnace, which comprises the following steps:
step one, raw material pretreatment
Selecting a cathode copper plate, preprocessing and then cutting;
step two, drawing the furnace
Adding the cathode copper plate cut in the step one into a feeding area, a standing area and a guide rod area at the same time, starting to heat, keeping the temperature for 12-15 hours when the temperature of a hearth reaches 300 ℃, continuing to heat, keeping the temperature for 8-12 hours at 500 ℃ and 800 ℃ respectively until the temperature is 1200 ℃, continuing to add the cut copper plate after the copper plate is completely melted, starting to add graphite to cover after copper liquid passes through a flow blocking wall, enabling the thickness of a covering layer to be 10-20 mm, heating the copper liquid to be boiling when the depth of the copper liquid reaches 1000mm, and exhausting for 1 hour;
step three, guiding rod
The blank rods are placed into the crystallizer, the diameter of each blank rod is 20-35 mm, the alloy liquid level is ensured to be within the range of 1000-1100 mm in the rod leading process, the furnace temperature is controlled to be within the range of 1200-1220 ℃, the depth of the crystallizer is controlled to be 150-200 mm, the rod leading speed is 325mm/min, and not less than 3 and not more than 5 rod leading rods are used for one time.
Furthermore, the cathode copper adopts A-grade copper.
Further, the pretreatment is to remove an oxide layer on the surface of the copper plate, verdigris and other visible impurities.
Further, the cathode copper plate is heated and cut to a width of not more than 200mm.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a crucible for an up-drawing continuous casting furnace.A hearth body is internally provided with two partition walls, and the hearth body is divided into a charging area, a standing area and a guide rod area; the bottom ends of the two partition walls are provided with openings, and filtering devices are arranged in the openings; a flow blocking wall is arranged at the bottom of the standing area; the design can increase the effective channel length of the copper liquid in the hearth, ensure the alloy elements in the hearth to be fully diffused and avoid segregation in the casting process; the addition of the flow blocking wall in the standing area increases the contact between the molten copper and the graphite furnace wall, and further reduces the oxygen content in the molten copper; the copper liquid shape stroke is increased, thereby being more beneficial to scum and exhaust and avoiding slag from being rolled into the casting rod; the feeding area, the standing area and the guide rod area are connected through the filtering device, so that the influence of the fluctuation of the liquid level of the feeding area on the liquid level of the guide rod area in the production process can be effectively avoided; the total weight of the copper liquid in the hearth is controlled within 3t, the graphite crucible has high heat-conducting property and large contact area with the copper liquid, and the furnace temperature control precision is improved. The cast rod produced by the method can effectively control the oxygen content in the cast rod to be reduced from 150ppm to below 3ppm, and the impurity content in the cast rod is controlled within 50 ppm.
Furthermore, the hearth with the structure has large depth and small cross section, can effectively reduce the contact between copper liquid and air in the casting process, and reduces the oxygen content in the copper liquid
Further, the original crystallizer die is a straight cylinder without a cover, copper liquid flows from bottom to top, slagging floating is easy to bring the copper liquid into the blank rod, the crystallizer is designed with a new die, the copper liquid flows in from two sides after the cover cap is added, and the copper liquid flows upwards to avoid slagging and feeding the blank rod.
Drawings
FIG. 1 is a schematic view showing the structure of a graphite crucible of the present invention;
FIG. 2 is a schematic cross-sectional view of the filter apparatus of FIG. 1;
FIG. 3 is a schematic view of the structure of the crystallizer.
Wherein, 1, a feeding zone; 2. a standing area; 3. a leader region; 4. a crystallizer; 5. alloy liquid level; 6. a filtration device; 7 is a flow blocking wall;
61. a filtration pore;
41. a graphite mold; 42. a blank bar; 43. and (7) capping.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description is made with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The components described and illustrated in the figures and embodiments of the present invention may be arranged and designed in a wide variety of different configurations, and thus, the detailed description of the embodiments of the present invention provided in the following figures is not intended to limit the scope of the claimed invention, but is merely representative of a select embodiment of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the figures and embodiments of the present invention, belong to the scope of protection of the present invention.
It should be noted that: the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, element, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, element, method, article, or apparatus.
The features and properties of the present invention are further described in detail below with reference to examples.
As shown in figure 1, the invention discloses a crucible for an up-drawing continuous casting furnace, which comprises a hearth body made of graphite, wherein two partition walls are arranged in the hearth body and used for dividing the hearth body into a charging area 1, a standing area 2 and a guide rod area 3; the bottom ends of the two partition walls are provided with openings, and the openings are internally provided with filtering devices 6; the bottom of the standing area 2 is provided with a choke wall 7, and the upper end of the choke wall 7 is lower than the separation wall.
Preferably, a crystallizer 4 is installed at the top end of the guide rod area 3, and a filter screen is arranged at the inlet of the crystallizer 4.
As shown in fig. 2, the filtering device 6 is a graphite filter screen, and the graphite filter screen is provided with a plurality of filtering holes 6161.
The original crystallizer mould is a straight cylinder without a cover, copper liquid flows from bottom to top, slagging floating is easy to bring the copper liquid into a blank rod, and as shown in figure 3, the copper liquid flows in from two sides after a cap 43 is added to the new mould and then flows upwards to avoid slagging into the blank rod.
Specifically, the depth of the hearth body is 1000-1500 mm;
the length of a furnace mouth of the charging area 1 is 800-1000 mm, and the width S1 is 200-250 mm;
the length of a furnace mouth of the standing area 2 is 800-1000 mm, the width S2 is 300-500 mm, and the height of the flow-resisting wall 7 is 300-500 mm;
the length of the furnace mouth of the leading rod area 3 is 800-1000 mm, and the width S3 is 200-250 mm.
The existing up-drawing continuous casting furnace generally adopts eddy current heating, and is similar to the principle of an electromagnetic furnace, the copper melting crucible disclosed by the invention adopts a refractory material, the heat preservation is good, but the heat conduction is poor, the temperature of copper liquid can be ensured to be uniform only by a large furnace mouth and a shallow hearth, and the temperature of the copper liquid can be uniform only by a graphite crucible used for a resistance furnace and good heat conduction under the condition of large depth.
The following examples employ hearth bodies of the size:
the depth of the hearth is 1200mm, the length of a furnace mouth of a charging area 1 is 1000mm, and the width is 250mm; the depth of a standing hearth is 1200mm, the length of a furnace opening is 1000mm, the width of the furnace opening is 500mm, and a 500mm high flow-resisting wall 7 is added in the middle of the standing area 2; the feeding area 1, the standing area 2 and the guide rod area 3 are connected through a graphite screen, the length of the screen is 100mm, the width of the screen is 100mm, and the middle of the screen is composed of 5 round holes with the diameter of 20 mm; the liquid level is required to be ensured within the range of 1000 mm-1100 mm in the rod guiding process, and the depth of the crystallizer 4 is controlled within the range of 150-200 mm; the speed of the guide rods is 325mm/min, the number of the guide rods in one time is not less than 3 and not more than 5, and the diameter of the guide rods is 20-35 mm; an inlet filter screen is added to the crystallizer 4 to prevent slag from entering.
Example 1
The invention discloses a casting process of a crucible for an up-drawing continuous casting furnace, which comprises the following steps:
step one, raw material pretreatment
The cathode copper adopts A-grade copper (Cu-CATH-1), and an oxide layer on the surface of the copper plate, verdigris and other visible impurities are removed during feeding;
step two, drawing the furnace
Heating and cutting the cathode copper plate in the first step to 180mm in width, adding the cathode copper plate into the feeding area 1, the standing area 2 and the guide rod area 3, starting heating, wherein the heating rate is 1 ℃/min, ensuring that the temperature in a hearth rises uniformly, avoiding crucible cracking caused by uneven temperature, keeping the temperature for 2h when the temperature of the hearth reaches 300 ℃, fully sintering the graphite crucible, removing moisture in the hearth and the crucible, avoiding influencing the service life, continuing heating, keeping the temperature for 1h at 500 ℃ and 800 ℃, keeping the temperature in the crucible fully uniform in the heat preservation process until the crucible is heated to 1200 ℃, ensuring that the molten copper has high melting efficiency at the temperature, facilitating scum impurity removal and good fluidity, avoiding increasing the burning loss of the molten copper, continuing adding the cut copper plate after the copper plate is completely melted, starting adding graphite to cover after the molten copper passes through a flow blocking wall 7, increasing the thickness of a graphite flake, effectively blocking air from contacting with the molten copper, effectively reducing the oxygen and hydrogen content of the molten copper, heating the molten copper to 1000mm until the molten copper boils, exhausting for 1h, and covering a furnace mouth with a heat preservation material in the boiling process of the furnace to avoid the copper liquid from splashing out.
Step three, guiding rod
In the rod guiding process, the alloy liquid level 5 is required to be within 1000mm, the furnace temperature is controlled within 1200-1220 ℃, the depth of the crystallizer 4 is controlled within 150mm, the rod guiding speed is 325mm/min, 4 rods are guided once, the diameter of each blank rod is 20mm, and an inlet filter screen is added to the crystallizer 4 to prevent slag from entering. It takes about 2 hours for the molten copper to flow from the charging zone 1 to the pin zone 3.
The cast rod produced by the embodiment can effectively control the oxygen content in the cast rod to be reduced from 150ppm to below 3ppm, and the impurity content in the cast rod is controlled within 45-50 ppm.
Example 2
The invention discloses a casting process of a crucible for an up-drawing continuous casting furnace, which comprises the following steps:
step one, raw material pretreatment
The cathode copper adopts A-grade copper (Cu-CATH-1), and an oxide layer on the surface of the copper plate, verdigris and other impurities visible to naked eyes are removed during feeding;
step two, drawing the furnace
Heating and cutting the cathode copper plate obtained in the first step to a width of 200mm, adding the cathode copper plate into the feeding area 1, the standing area 2 and the guide rod area 3, starting to heat, keeping the temperature for 2h when the temperature of the hearth reaches 300 ℃, continuing to heat, keeping the temperature for 1h at 500 ℃ and 800 ℃ respectively until the temperature reaches 1200 ℃, continuing to add the cut copper plate after the copper plate is completely melted, starting to add graphite to cover after the copper liquid passes through the flow blocking wall 7, enabling the thickness of a covering layer to be 15mm, heating the copper liquid to a depth of 1000mm until the copper liquid boils, and exhausting for 1h.
Step three, guiding rod
In the guide rod process, the alloy liquid level 5 is required to be ensured within the range of 1100mm, the furnace temperature is controlled within the range of 1200-1220 ℃, the depth of the crystallizer 4 is controlled within 200mm, the guide rod speed is 325mm/min, 5 guide rods are used for one time, the diameter of each blank rod is 35mm, an inlet filter screen is added to the crystallizer 4, and slag is prevented from entering the crystallizer. It takes about 2 hours for the copper bath to flow from the charging zone 1 to the draw-bar zone 3.
The cast rod produced by the embodiment can effectively control the oxygen content in the cast rod to be reduced from 150ppm to below 3ppm, and the impurity content in the cast rod is controlled within 50 ppm.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (9)
1. The crucible for the up-drawing continuous casting furnace is characterized by comprising a hearth body made of graphite, wherein two partition walls are arranged in the hearth body and used for dividing the hearth body into a charging area (1), a standing area (2) and a guide rod area (3);
the bottom ends of the two partition walls are provided with gaps, and the gaps are internally provided with filtering devices (6);
a choke wall (7) is arranged at the bottom of the standing area (2), and the upper end of the choke wall (7) is lower than the separation wall;
a crystallizer (4) is arranged at the top end of the guide rod area (3).
2. Crucible for an up-drawing continuous casting furnace according to claim 1, characterized in that the filtering means (6) is a graphite screen.
3. Crucible for an up-drawing continuous casting furnace according to claim 1, characterized in that the inlet of the crystallizer (4) is provided with a filtering screen.
4. The crucible for the up-drawing continuous casting furnace according to claim 1, wherein the mold (4) comprises a graphite mold (41) and a cap (43) provided at a lower end of the graphite mold (41).
5. The crucible for the up-drawing continuous casting furnace according to claim 1, wherein the depth of the hearth body is 1000 to 1500mm;
the furnace mouth of the charging area (1) is 800-1000 mm long and 200-250 mm wide;
the length of a furnace mouth of the standing area (2) is 800-1000 mm, the width is 300-500 mm, and the height of the flow-resisting wall (7) is 300-500 mm;
the furnace mouth of the guide rod area (3) is 800-1000 mm long and 200-250 mm wide.
6. The casting process of the crucible for the up-drawing continuous casting furnace according to any one of claims 1 to 5, comprising the steps of:
step one, raw material pretreatment
Selecting a cathode copper plate, preprocessing and then cutting;
step two, drawing the furnace
Adding the cathode copper plate cut in the step one into a feeding area (1), a standing area (2) and a guide rod area (3) at the same time, starting to heat, keeping the temperature for 12-15 h when the temperature of a hearth reaches 300 ℃, continuing to heat, keeping the temperature for 8-12 h at 500 ℃ and 800 ℃ respectively until the temperature is heated to 1200 ℃, continuing to add the cut copper plate after the copper plate is completely melted, starting to add graphite for covering after copper liquid passes through a flow blocking wall (7), wherein the thickness of a covering layer is 10-20 mm, the depth of the copper liquid reaches 1000mm, heating until the copper liquid is boiled, and exhausting for 1h;
step three, guiding rod
A blank rod (42) is placed in the crystallizer (4), the diameter of the blank rod (42) is 20-35 mm, the alloy liquid level (5) is ensured to be within the range of 1000-1100 mm in the rod leading process, the furnace temperature is controlled to be within the range of 1200-1220 ℃, the depth of the crystallizer (4) is controlled to be 150-200 mm, the rod leading speed is 325mm/min, and not less than 3 rods are led at a time and not more than 5 rods are led at a time.
7. The casting process according to claim 6, wherein grade A copper is adopted as cathode copper.
8. The casting process according to claim 6, wherein the pretreatment is removal of copper plate surface oxidation layers, verdigris and other macroscopic impurities.
9. The casting process according to claim 6, wherein the cathode copper plate is heat-cut to a width of not more than 200mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211615197.0A CN115815551A (en) | 2022-12-15 | 2022-12-15 | Crucible for up-drawing continuous casting furnace and casting process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211615197.0A CN115815551A (en) | 2022-12-15 | 2022-12-15 | Crucible for up-drawing continuous casting furnace and casting process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115815551A true CN115815551A (en) | 2023-03-21 |
Family
ID=85545839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211615197.0A Pending CN115815551A (en) | 2022-12-15 | 2022-12-15 | Crucible for up-drawing continuous casting furnace and casting process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115815551A (en) |
-
2022
- 2022-12-15 CN CN202211615197.0A patent/CN115815551A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101781712B (en) | Runner type online degassing device | |
| CN1664122A (en) | Method for producing low-carbon high-sulfur (sulfur-phosphorous) easy-to-cut structural steel continuous casting billet | |
| CN108339953A (en) | It is a kind of it is antivacuum under draw the production technology of continuous casting chromium-zirconium-copper slab ingot | |
| CN105369172A (en) | Oxygen-free copper bar suitable for cable and preparing method of oxygen-free copper bar | |
| CN110343870A (en) | A kind of oxygen-free copper founding production method | |
| CN110343879A (en) | A kind of anaerobic Kufil founding production method | |
| CN115815551A (en) | Crucible for up-drawing continuous casting furnace and casting process thereof | |
| JP2008030061A (en) | Mold powder for continuous casting of high aluminum steel | |
| CN110819823A (en) | Method for preparing high-purity aluminum and prepared 5N high-purity aluminum | |
| CN201442974U (en) | Electroslag furnace crystallizer used for smelting rollers | |
| CN101486086B (en) | Flat die casting method for silver bullion | |
| JP5113413B2 (en) | Aluminum ingot casting method | |
| WO2023178955A1 (en) | Manufacturing method for high-quality quartz crucible | |
| CN114769573B (en) | Stopper rod and method for preventing continuous casting pouring low-temperature accident | |
| CN215746296U (en) | Rare earth metal or alloy condensation structure | |
| CN108823428A (en) | A kind of preparation method of oxygen-free copper bar | |
| CN207227513U (en) | A kind of consutrode | |
| CN212127955U (en) | Device for removing scum of float glass melting furnace | |
| CN102168208A (en) | Method for manufacturing ZnSn sputtering target for glass coating | |
| KR101371959B1 (en) | Mold flux for casting TWIP with high Al content and method for producing TWIP using the same | |
| CN111663050A (en) | Copper waste pretreatment for copper continuous casting process and method for smelting copper by using copper waste pretreatment | |
| CN111747415B (en) | Method for removing impurity iron in industrial silicon | |
| CN103949617A (en) | Device and method for preparing high-purity copper and copper alloy ingot | |
| RU2793619C1 (en) | Method for producing continuous copper blank by top draw method and technological complex for implementing this method | |
| CN116904756B (en) | Electrode assembly for vacuum consumable remelting and vacuum consumable remelting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |