CN108568514A - A kind of devices and methods therefor controlling vacuum induction melting field trash and slag inclusion - Google Patents
A kind of devices and methods therefor controlling vacuum induction melting field trash and slag inclusion Download PDFInfo
- Publication number
- CN108568514A CN108568514A CN201810594620.0A CN201810594620A CN108568514A CN 108568514 A CN108568514 A CN 108568514A CN 201810594620 A CN201810594620 A CN 201810594620A CN 108568514 A CN108568514 A CN 108568514A
- Authority
- CN
- China
- Prior art keywords
- casting
- working chamber
- tundish
- vacuum
- crucible
- 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
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
- B22D41/14—Closures
- B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
- B22D41/18—Stopper-rods therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/04—Refining by applying a vacuum
-
- 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
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- Furnace Details (AREA)
Abstract
A kind of devices and methods therefor controlling vacuum induction melting field trash and slag inclusion, the induction furnace includes working chamber and casting room, and vacuum separation valve is provided between the working chamber and casting room, crucible is provided in the working chamber, it is characterised in that：It is additionally provided with vacuum insulation sleeve at the top of the working chamber, dry slag stick is provided in the distance sleeve, the dry slag bar material is identical as the alloy base material of institute's melting, and the dry slag stick is used to adhere to the dross in molten bath, and can be carried out at the same time thermometric sampling；Heatable L-type tundish is provided in the casting room, for reducing the residence time of the casting degree of superheat and extension molten bath；L-type tundish top is provided with stopper device, is connect at the top of the stopper device upper end and casting room, and lower end is telescopic stopper.The present invention can improve the degree of purity of vacuum induction melting ingot casting.
Description
Technical field
The invention belongs to extraordinary field of metallurgy, are related to high-performance metal materials vacuum metallurgy process, and in particular to a kind of control
The devices and methods therefor of vacuum induction melting field trash and slag inclusion processed.
Background technology
Vacuum induction melting be high performance alloys ingot casting production initial and master operation, advantage be accurately alloy at
The impurity elements such as sub-control system and gas remove.But being mingled with caused by the field trash of deoxidization desulfuration formation and lining wear etc.
Object and slag inclusion are the controlling difficulties of vacuum induction melting.Hot-working, Huo Zhezhen are directly carried out for the ingot casting of vacuum induction production
For sky induction plus vacuum arc remelting (also known as double vacuum meltings) technological process, relevant field trash and slag inclusion can cause seriously
Influence, including formation of crack, Solidification Quality defect (such as dirty hickie, blackspot).
Include for the control method of field trash and slag inclusion in current industrial practice：
（1）Reaction between carbon and oxygen deoxidation is utilized as far as possible, reduces oxide-based be mingled with；
（2）Crucible is rolled towards sprue gate negative direction before cast, by part surface dross adherence in sprue gate opposite direction
Sidewall of crucible on；
（3）Using the vacuum induction melting system with tundish；
（4）Using ceramic filter.
It is as far as possible a kind of method that effective control oxide is mingled with using reaction between carbon and oxygen deoxidation, but the method can only be reduced
Oxide is mingled with increment.Crucible before cast rolls the part surface dross that operates and can reduce when heat melting, but effect has
Limit, and the clinker of these adherency can become one of the slag inclusion source of next stove melting again.
Tundish can extend the residence time in molten bath, and the reasonable setting based on dam and shelves weir promotes the upper of field trash
It is floating.But the tundish that current industrial production uses does not have heating device due to using elongate in shape, and melt flows through tundish
Heat radiation and the heat received by tundish are more, for the production accident for avoiding the mouth of a river from condensing, it has to the cast degree of superheat is improved,
And lining wear is caused to aggravate, slag inclusion quantity increases；Second is that not having flow control device, field trash and slag inclusion do not have on time enough
Floating, cast starts rear field trash and slag inclusion melt is directly entered ingot mould, floats on the field trash and slag inclusion of tundish molten surface
Also finally ingot mould is flowed into tail steel.CN102901351A refers to a kind of crucible and tundish global design, and in crucible
Top curve tundish is jumped a queue the method for stick, and this method can effectively control poring rate and tailings using stopper, but due to it is non-solely
Vertical tundish also has no effective time floating without dam, shelves weir etc., field trash and slag inclusion, and casting process is easy hair
Raw slag.
Ceramic filter can effectively stop filtering field trash and slag inclusion, but since filter hole is very tiny, cause to pour
It is slow to note speed, and filter hole once blocks, and can lead to production disruption.
Invention content
The invention discloses a kind of control vacuum induction melting field trash and the device of slag inclusion, the induction furnace includes molten
Room and casting room are refined, vacuum separation valve is provided between the working chamber and casting room, crucible, institute are provided in the working chamber
State and be additionally provided with vacuum insulation sleeve at the top of working chamber, be provided with dry slag stick in the distance sleeve, the dry slag bar material with
The alloy base material of institute's melting is identical, and the dry slag stick is used to adhere to dross and the thermometric sampling in molten bath；In the casting room
It is provided with heatable L-type tundish, for reducing the residence time of the casting degree of superheat and extension molten bath；The L-type tundish
Top is provided with stopper device, is connect at the top of the stopper device upper end and casting room, and lower end is telescopic stopper.
Further, the heatable resistance to material of L-type tundish has been internally embedded electric heater unit, the electric heater unit
For can electrically heated resistance wire.
A method of control vacuum induction melting field trash and slag inclusion, including following steps：
Step 1：It is incorporated corresponding carbon dust according to the oxygen content of body material with carbon deoxidation and is placed in working chamber's crucible bottom；
Step 2：Working chamber's bell is closed, starts to vacuumize until Absolute truth reciprocal of duty cycle reaches setting value, and starts to check static leakage
Gas rate ensures the leakproofness of working chamber；
Step 3：Be powered fusing, promotes the oxygen in reaction between carbon and oxygen removal raw material using maximum power, and to be formed by being removed in vacuo
CO gases；
Step 4：Judge whether purifier terminates, this stage observes primary dynamic leak rate per 5min, if adjacent dynamic twice
Leak rate is no more than 5%, then it represents that and refining period terminates, i.e., is terminated using the stage of reaction between carbon and oxygen, continuously adds body material, and
Thermometric samples；
Step 5：Crucible for smelting terminates preceding 10min, declines dry slag stick, and carry out dry slag operation in weld pool surface, sticky removing surface is floating
It is promoted after slag, and closes vacuum separation valve；
Step 6：Crucible for smelting terminates preceding 45min, toasts L-type tundish using coal gas or natural gas, and before melting terminates
L-type tundish is hung in casting room by 15min, opens electric heater unit, is closed casting room fire door and is vacuumized, waits for casting room vacuum degree
After identical as working chamber, vacuum separation valve is opened, mobile tundish track declines to station is poured into a mould at stopper device to cast gate；
Step 7：The crucible that fascinates starts to pour into a mould, and when L-type tundish inner melt to height 2/3rds, promotes stopper device, opens
Begin formally to cast, when the casting of last branch ingot casting is nearly completed, declines stopper device and carry out flow control, and liquid level is low in tundish
When one third, stopper device is blocked in place, prevents tail steel from entering in ingot mould.
In the present invention, using can heated type L-type tundish mitigate high temperature to ingot mould bottom to reduce the cast degree of superheat
Disk washes away loss；The resistance to material of tundish be internally embedded can electrically heated resistance wire to improve the resistance to face temperature that is contacted with melt
Degree reduces melt and flows through the heat loss of tundish, thus can reduce the cast degree of superheat, reduces the folder generated by lining wear
Slag.L-type tundish can effectively extend the residence time in molten bath, promote the floating of field trash and slag inclusion, while L-type tundish may be used also
Reduce the heat radiation area that melt flows through tundish, it helps reduce the casting degree of superheat.It, can be with using stopper rod of tundish device
It is being poured into a mould after so that molten bath is reached certain height in tundish, is promoting the floating of field trash and slag inclusion, and before casting terminates
Flow control realizes the control of tail steel, avoids the high quantity of slag.The present invention can be effectively improved the degree of purity of vacuum induction melting ingot casting.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
Fig. 2 is the L-type tundish structure enlarged diagram of the present invention.
Specific implementation mode
Embodiment 1 refers to Fig. 1 and 2, GH4169 alloy vacuum induction melting, using following steps：
（1）It is estimated according to the oxygen content of body material sheet nickel, is incorporated corresponding carbon dust and is placed in crucible bottom.
（2）Bell is closed, starts to vacuumize until Absolute truth reciprocal of duty cycle reaches setting value, and starts to check static leak rate,
It need to hunt leak and handle Ru abnormal, ensure leakproofness.
（3）Be powered fusing, promotes the oxygen in reaction between carbon and oxygen removal raw material using maximum power, and to be formed by being removed in vacuo
CO gases.
（4）After melting stage, that is, enter refining period.This stage observes primary dynamic leak rate per 5min, if adjacent
Dynamic leak rate is no more than 5% twice, then it represents that refining period terminates, i.e., is terminated using the stage of reaction between carbon and oxygen, continuously adds nickel conjunction
Gold, and thermometric samples.
（5）Melting terminates preceding 10min, declines dry slag stick 2, and carry out dry slag operation, sticky removing surface scum in weld pool surface
After promoted, and close vacuum separation valve.
（6）Crucible for smelting terminates preceding 45min, using coal gas or natural gas baking L-type tundish 3, and before melting terminates
Tundish is hung in casting room by 15min, opens electric heater unit 4, is closed fire door and is vacuumized, waits for casting room vacuum degree and working chamber
After identical, vacuum separation valve is opened, mobile tundish track declines to station is poured into a mould at stopper device 5 to cast gate.
（7）The crucible that fascinates starts to pour into a mould, and when 3 inner melt of tundish is to highly 2/3rds, promotes stopper, starts formally to pour
Casting.When the casting of last branch ingot casting is nearly completed, decline 5 flow control of stopper device, and liquid level is less than one third in tundish
When stopper block in place, prevent tail steel from entering in ingot mould.
Embodiment 2 refers to Fig. 1 and 2, GH4169 alloy vacuum induction melting, using following steps：
（1）It is estimated according to the oxygen content of body material ingot iron, is incorporated corresponding carbon dust and is placed in crucible bottom.
（2）Bell is closed, starts to vacuumize until Absolute truth reciprocal of duty cycle reaches setting value, and starts to check static leak rate,
It need to hunt leak and handle Ru abnormal, ensure leakproofness.
（3）Be powered fusing, promotes the oxygen in reaction between carbon and oxygen removal raw material using maximum power, and to be formed by being removed in vacuo
CO gases.
（4）After melting stage, that is, enter refining period.This stage observes primary dynamic leak rate per 5min, if adjacent
Dynamic leak rate is no more than 5% twice, then it represents that refining period terminates, i.e., is terminated using the stage of reaction between carbon and oxygen, continuously adds iron conjunction
Gold, and thermometric samples.
（5）Melting terminates preceding 10min, declines dry slag stick 2, and carry out dry slag operation, sticky removing surface scum in weld pool surface
After promoted, and close vacuum separation valve.
（6）Crucible for smelting terminates preceding 45min, using coal gas or natural gas baking L-type tundish 3, and before melting terminates
Tundish is hung in casting room by 15min, opens electric heater unit 4, is closed fire door and is vacuumized, waits for casting room vacuum degree and working chamber
After identical, vacuum separation valve is opened, mobile tundish track declines to station is poured into a mould at stopper device 5 to cast gate.
（7）The crucible that fascinates starts to pour into a mould, and when 3 inner melt of tundish is to highly 2/3rds, promotes stopper, starts formally to pour
Casting.When the casting of last branch ingot casting is nearly completed, decline 5 flow control of stopper device, and liquid level is less than one third in tundish
When stopper block in place, prevent tail steel from entering in ingot mould.
Claims (3)
1. the device of a kind of control vacuum induction melting field trash and slag inclusion, the induction furnace includes working chamber and casting room,
It is provided with vacuum separation valve between the working chamber and casting room（7）, crucible is provided in the working chamber（1）, feature exists
In：It is additionally provided with vacuum insulation sleeve at the top of the working chamber（6）, the distance sleeve（6）In be provided with dry slag stick（2）, institute
State dry slag stick（2）Material is identical as the alloy base material of institute's melting, the dry slag stick（2）Dross for adhering to molten bath and survey
Temperature sampling；Heatable L-type tundish is provided in the casting room（3）, for reducing the casting degree of superheat and extend molten bath
Residence time；The L-type tundish（3）Top is provided with stopper device（5）, the stopper device（5）Upper end and casting ceiling
Portion connects, and lower end is telescopic stopper.
2. the device of a kind of control vacuum induction melting field trash according to claim 1 and slag inclusion, it is characterised in that：
The heatable L-type tundish（3）Resistance to material has been internally embedded electric heater unit（4）, the electric heater unit（4）Electric can to add
The resistance wire of heat.
3. the method for a kind of control vacuum induction melting field trash according to claim 1 or 2 and slag inclusion, including it is following
Several steps：
Step 1：It is incorporated corresponding carbon dust according to the oxygen content of body material with carbon deoxidation and is placed in working chamber's crucible（1）Bottom
Portion；
Step 2：Working chamber's bell is closed, starts to vacuumize until Absolute truth reciprocal of duty cycle reaches setting value, and starts to check static leakage
Gas rate ensures the leakproofness of working chamber；
Step 3：Be powered fusing, promotes the oxygen in reaction between carbon and oxygen removal raw material using maximum power, and to be formed by being removed in vacuo
CO gases；
Step 4：Judge whether purifier terminates, this stage observes primary dynamic leak rate per 5min, if adjacent dynamic twice
Leak rate is no more than 5%, then it represents that and refining period terminates, i.e., is terminated using the stage of reaction between carbon and oxygen, continuously adds body material, and
Thermometric samples；
Step 5：Crucible for smelting terminates preceding 10min, declines dry slag stick（2）, and carry out dry slag operation, sticky removing table in weld pool surface
It is promoted after the dross of face, and closes vacuum separation valve（7）；
Step 6：Crucible for smelting terminates preceding 45min, and L-type tundish is toasted using coal gas or natural gas（3）, and terminate in melting
Preceding 15min is by L-type tundish（3）Casting room is hung in, electric heater unit is opened（4）, close casting room fire door and vacuumize, wait casting
After room vacuum degree is identical as working chamber, vacuum separation valve is opened, mobile tundish track declines stopper device to station is poured into a mould
（5）To cast gate；
Step 7：Fascinate crucible（1）Start to pour into a mould, waits for L-type tundish（3）When inner melt to height 2/3rds, stopper is promoted
Device（5）, start formal casting and decline stopper device when the casting of last branch ingot casting is nearly completed（5）Progress flow control, and
Tundish（3）When interior liquid level is less than one third, by stopper device（5）It blocks in place, prevents tail steel from entering in ingot mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810594620.0A CN108568514A (en) | 2018-06-11 | 2018-06-11 | A kind of devices and methods therefor controlling vacuum induction melting field trash and slag inclusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810594620.0A CN108568514A (en) | 2018-06-11 | 2018-06-11 | A kind of devices and methods therefor controlling vacuum induction melting field trash and slag inclusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108568514A true CN108568514A (en) | 2018-09-25 |
Family
ID=63573197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810594620.0A Pending CN108568514A (en) | 2018-06-11 | 2018-06-11 | A kind of devices and methods therefor controlling vacuum induction melting field trash and slag inclusion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108568514A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110747360A (en) * | 2019-12-06 | 2020-02-04 | 北京钢研高纳科技股份有限公司 | GH4720Li alloy and smelting method thereof, GH4720Li alloy part and aeroengine |
| CN110947938A (en) * | 2020-02-26 | 2020-04-03 | 莱州润昇石油设备有限公司 | Vacuum hot shell casting device and working method |
| CN111230090A (en) * | 2018-11-28 | 2020-06-05 | 常熟南师大发展研究院有限公司 | Ingot smelting and casting method containing three-level filter residues |
| CN111230089A (en) * | 2018-11-28 | 2020-06-05 | 常熟南师大发展研究院有限公司 | Smelting ingot casting device containing three-level filter residue structure |
| CN112045179A (en) * | 2020-09-04 | 2020-12-08 | 江苏隆达超合金航材有限公司 | Reusable scum salvaging device and scum salvaging method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08252650A (en) * | 1995-03-17 | 1996-10-01 | Shinko Electric Co Ltd | Casting equipment of vacuum induction melting furnace |
| JPH11197796A (en) * | 1998-01-09 | 1999-07-27 | Daido Steel Co Ltd | Ingot-making apparatus for molten steel |
| CN104567367A (en) * | 2014-12-30 | 2015-04-29 | 朱兴发 | Double-power-source bottom pouring centrifugal vacuum induction melting and casting furnace |
-
2018
- 2018-06-11 CN CN201810594620.0A patent/CN108568514A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08252650A (en) * | 1995-03-17 | 1996-10-01 | Shinko Electric Co Ltd | Casting equipment of vacuum induction melting furnace |
| JPH11197796A (en) * | 1998-01-09 | 1999-07-27 | Daido Steel Co Ltd | Ingot-making apparatus for molten steel |
| CN104567367A (en) * | 2014-12-30 | 2015-04-29 | 朱兴发 | Double-power-source bottom pouring centrifugal vacuum induction melting and casting furnace |
Non-Patent Citations (4)
| Title |
|---|
| YOGESHWAR SAHAI等著: "《洁净钢生产的中间包技术》", 31 May 2009, 冶金工业出版社 * |
| 俞海明主编: "《转炉钢水的炉外精炼技术》", 31 August 2011, 冶金工业出版社 * |
| 李志著: "《航空超高强度钢的发展》", 31 May 2012, 国防工业出版社 * |
| 第三机械工业部: "《K3合金文集》", 31 May 1982 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111230090A (en) * | 2018-11-28 | 2020-06-05 | 常熟南师大发展研究院有限公司 | Ingot smelting and casting method containing three-level filter residues |
| CN111230089A (en) * | 2018-11-28 | 2020-06-05 | 常熟南师大发展研究院有限公司 | Smelting ingot casting device containing three-level filter residue structure |
| CN110747360A (en) * | 2019-12-06 | 2020-02-04 | 北京钢研高纳科技股份有限公司 | GH4720Li alloy and smelting method thereof, GH4720Li alloy part and aeroengine |
| CN110947938A (en) * | 2020-02-26 | 2020-04-03 | 莱州润昇石油设备有限公司 | Vacuum hot shell casting device and working method |
| CN112045179A (en) * | 2020-09-04 | 2020-12-08 | 江苏隆达超合金航材有限公司 | Reusable scum salvaging device and scum salvaging method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108568514A (en) | A kind of devices and methods therefor controlling vacuum induction melting field trash and slag inclusion | |
| CN104451178B (en) | Large scale, super clean, the electro-slag re-melting method of high-performance nickel-base alloy 690 | |
| CN108676962B (en) | High-performance alloy ultra-pure purification vacuum induction melting system and use method thereof | |
| CN104550805B (en) | A kind of deformation magnesium alloy ingot blank preparation facilities and method | |
| CN108176844A (en) | A kind of device and method for clearing up tundish upper nozzle dross object | |
| CN202869229U (en) | Multifunctional semi-continuous vacuum induction melting and casting furnace | |
| CN103575102A (en) | Multipurpose semicontinuous vacuum induction casting furnace | |
| CN114082910A (en) | Method for inhibiting water gap from being blocked | |
| CN108723348B (en) | Method for improving bottom scouring of vacuum induction melting ingot mold | |
| CN108660320A (en) | A kind of low-aluminium high titanium-type high temperature alloy electroslag remelting process | |
| CN109811170A (en) | A kind of cobalt base superalloy sulfur reduction technique | |
| CN104907540B (en) | A kind of method of the liquid pouring of electroslag continuous casting billet of strip steel water diverter | |
| CN106111970A (en) | A kind of device and method being reduced ladle top slag oxidisability by excessive slag method | |
| CN206828617U (en) | Vacuum melting nickel ingot produces inert gas protection device | |
| CN104357673A (en) | Method for remelting and smelting metal electro slag | |
| CN201569292U (en) | Reversible sealed smelting furnace with two integrated furnaces | |
| CN104195356A (en) | Smelting and purification method of beryllium beads used for casting pure beryllium ingots | |
| RU2309996C2 (en) | Method for making ingots of copper and its alloys | |
| CN100596309C (en) | Secondary refining method of 10 to 30 tons bottom breakout ladle | |
| CN107699712B (en) | Magnesium metallurgical furnace and magnesium smelting method | |
| CN201201956Y (en) | 10-30 tons bottom breakout ladle external refining apparatus | |
| CN216421057U (en) | Slagging-off machine for slagging-off in front of high-silicon silicomanganese ore heating furnace | |
| CN206028722U (en) | Device of ladle top sediment oxidability is reduced through sediment method of overflowing | |
| CN218583781U (en) | Vacuum induction melting slag fishing device | |
| JPS58133338A (en) | Method for melting titanium group metal or alloy thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180925 |
|
| RJ01 | Rejection of invention patent application after publication |