CN108607980B - Stopper rod capable of blowing argon efficiently and having flocculation removal function - Google Patents
Stopper rod capable of blowing argon efficiently and having flocculation removal function Download PDFInfo
- Publication number
- CN108607980B CN108607980B CN201810957106.9A CN201810957106A CN108607980B CN 108607980 B CN108607980 B CN 108607980B CN 201810957106 A CN201810957106 A CN 201810957106A CN 108607980 B CN108607980 B CN 108607980B
- Authority
- CN
- China
- Prior art keywords
- head
- rod
- inner cavity
- argon
- hole awl
- 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.)
- Active
Links
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 28
- 238000007664 blowing Methods 0.000 title claims abstract description 13
- 230000016615 flocculation Effects 0.000 title claims abstract description 10
- 238000005189 flocculation Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000009423 ventilation Methods 0.000 claims description 11
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 239000007767 bonding agent Substances 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910052596 spinel Inorganic materials 0.000 claims description 3
- 239000011029 spinel Substances 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 9
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction 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
- B22D41/14—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
- B22D41/186—Stopper-rods therefor with means for injecting a fluid into the melt
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Media Introduction/Drainage Providing Device (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a stopper rod capable of blowing argon efficiently and having a flocculation removal function, which comprises a wire block and a breathable material, wherein the wire block is arranged on the side wall of an inner cavity, the inner cavity is arranged in a rod body, a funnel catheter is fixed in the inner cavity, the bottom of the funnel catheter is connected with the top end of a through hole awl, the through hole awl is arranged in a rod head, the rod head is arranged at the bottom end of the rod body, the breathable material is arranged in the rod head, and the breathable material is connected with the bottom end of the through hole awl. This but high-efficient argon blowing just has stopper stick of getting rid of wadding flow function adopts the fine solution of novel structural design to blow argon type stopper stick and the problem that dispersion type stopper stick easily appears to can more thoroughly and stable carry out wadding flow thing and get rid of the operation, ensure that the steel process of watering is more smooth and easy going on, and make the stopper stick not receive the argon gas pressure variation influence when blowing argon gas, the argon gas that blows out is even stable, makes the crystallizer liquid level steadily have not undulant in whole casting process.
Description
Technical Field
The invention relates to the technical field of steel continuous casting equipment, in particular to a stopper rod capable of blowing argon efficiently and having a flocculation removal function.
Background
In the continuous casting process, many devices and apparatuses are used, and the stopper rod is a refractory rod, which is a device installed in a steel ladle and used for controlling the opening and closing of a water gap and the flow rate of molten steel by lifting displacement, and is an essential important device in the casting steel production process.
Along with the continuous development of the cast steel industry, the use frequency of the stopper rod also greatly rises, but in the process of using the traditional stopper rod, the conventional stopper rod discovers that once a flocculation flow is gathered in a rod head, a tundish upper water gap bowl part and an integral immersed water gap bowl part or an inner cavity, the normal flow control effect and the steel passing amount of molten steel can be seriously influenced, the pulling speed of a casting blank can not be matched with corresponding technical parameters, the normal production rhythm is influenced, various quality problems of the casting blank are induced, the single casting life is also reduced, and the production cost is increased.
Disclosure of Invention
The invention aims to provide a stopper rod capable of blowing argon efficiently and having a flocculation removal function, so as to solve the problems that in the prior art, flocculation cannot be removed, liquid level slag is easy to cause to influence casting blank quality, single casting time service life is shortened, and production cost is increased.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a but high-efficient argon blowing just has stopper stick of getting rid of wadding flow function, includes silk piece and ventilative material, the silk piece is installed on the lateral wall of inner chamber, and the inner chamber setting is in the inside of body of rod to be fixed with the funnel pipe in the inner chamber, the bottom of funnel pipe and the top interconnect of through-hole awl, and the through-hole awl is installed in the club head, and the club head sets up the bottom at the body of rod, ventilative material sets up the inside at the club head, and ventilative material and the bottom interconnect of through-hole awl.
Preferably, the distance between the top end of the funnel catheter and the wire block is 100 mm, and the wire blocks are symmetrically distributed on the side wall of the inner cavity.
Preferably, the through hole awl is divided into a concave part and a convex part, and the concave part of the through hole awl is connected with the bottom end of the funnel catheter.
Preferably, the center of the circle in which the center of the club head is positioned is taken as the center, the longitudinal direction of the club head is taken as the symmetry axis, and the region of the ventilation material filled in the club head is in the range of 5-30 degrees.
Preferably, the breathable material comprises, by weight, 60% -80% of magnesia-alumina spinel, 6% -20% of graphite, 5% -15% of sawdust, 1% -2% of light-burned alumina A powder, 1% -5% of an additive, 5% -15% of a bonding agent, and metal silicon powder as the components of the additive, and thermosetting phenolic resin and liquid resin as the bonding agent, wherein the carbon residue rate of the phenolic resin is greater than or equal to 40%, and the solid content is greater than or equal to 60%.
Preferably, the top of the breathable material is nested at the bottom end of the through hole awl, and the shape of the front section of the breathable material is a sector.
Compared with the prior art, the invention has the beneficial effects that: the stopper rod capable of blowing argon efficiently and having the flocculation removal function well solves the problem that argon blowing stopper rod and dispersion stopper rod are easy to occur by adopting a novel structural design, and can perform flocculation removal operation more thoroughly and stably so as to ensure that the steel casting process is performed more smoothly;
And the stopper rod is not influenced by the pressure fluctuation of argon when argon is blown, the blown argon is uniform and stable, the liquid level of the crystallizer is stable and has no fluctuation in the whole casting process, and the funnel guide pipe is used, so that the argon with lower temperature can be directly isolated in severe cold winter on the basis of ensuring the stability of the pressure of the argon, the stopper rod is not contacted with the stopper rod, and the occurrence of thermal shock cracks of the stopper rod caused by high temperature difference is avoided.
Drawings
FIG. 1 is a schematic cross-sectional elevation view of a barrel according to the present invention;
FIG. 2 is a schematic diagram of a cross-sectional elevation of a filament block of the present invention;
fig. 3 is an enlarged schematic view of the structure of fig. 1a according to the present invention.
In the figure: 1. a silk block; 2. a funnel catheter; 3. a barrel; 4. an inner cavity; 5. a through hole awl; 6. a club head; 7. and (5) ventilation material.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a but high-efficient argon gas of blowing just has stopper stick of getting rid of wadding flow function, including silk piece 1, funnel pipe 2, body 3, inner chamber 4, through-hole awl 5, stick head 6 and ventilative material 7, silk piece 1 is installed on the lateral wall of inner chamber 4, and inner chamber 4 sets up in the inside of body 3, and be fixed with funnel pipe 2 in the inner chamber 4, the bottom of funnel pipe 2 and the top interconnect of through-hole awl 5, and through-hole awl 5 is installed in stick head 6, and stick head 6 sets up the bottom at body 3, ventilative material 7 sets up the inside at stick head 6, and ventilative material 7 and the bottom interconnect of through-hole awl 5.
In the embodiment, the distance between the top end of the funnel catheter 2 and the wire block 1 is 100 mm, and 2 wire blocks 1 are symmetrically distributed on the side wall of the inner cavity 4, so that the funnel catheter 2 can isolate argon from the rod body 3 through the structural design;
The through hole awl 5 is divided into a concave part and a convex part, the concave part of the through hole awl 5 is connected with the bottom end of the funnel catheter 2, and the structural design of the through hole awl 5 enables argon gas transmitted by the funnel catheter 2 to be intensively conveyed into the ventilation material 7;
The center of the circle where the center of the club head 6 is located is taken as the center, the longitudinal direction of the center of the club head 6 is taken as a symmetrical axis, and the area of the ventilation material 7 filled in the club head 6 is in the range of 5-30 degrees, and the ventilation material 7 can play a role in stabilizing the flow of argon through the structural design;
The material of the breathable material 7 comprises, by weight, 60% -80% of magnesia-alumina spinel, 6% -20% of graphite, 5% -15% of sawdust, 1% -2% of light-burned alumina A powder, 1% -5% of an additive and 5% -15% of a bonding agent, wherein the additive comprises metal silicon powder, the bonding agent is thermosetting phenolic resin and liquid resin, the carbon residue rate of the phenolic resin is greater than or equal to 40%, the solid content is greater than or equal to 60%, and the breathable material 7 not only can ensure proper apparent porosity, but also can withstand enough temperature due to the components of the breathable material 7;
the top of ventilative material 7 nests in the bottom of through-hole awl 5, and ventilative material 7's front cross-section's shape is fan-shaped, foretell structural design makes through-hole awl 5 and ventilative material 7 cooperation use can guarantee that the argon gas lasts stable discharge.
Working principle: when the device is used, the top end of the external argon pipe and the top end of the rod body 3 are connected with each other, argon enters the inner cavity 4 arranged in the rod body 3 through the external argon pipe, is discharged from the bottom end of the funnel guide pipe 2 which is positioned 100 millimeters below the wire block 1, enters the through hole awl 5, is conveyed into the ventilation material 7 through the raised head structure at the bottom end of the through hole awl 5, and is finally discharged from the rod head 6 stably.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The utility model provides a stopper stick that can high-efficient argon blowing just has the function of getting rid of batting flow, includes silk piece (1) and ventilative material (7), its characterized in that: the wire block (1) is arranged on the side wall of the inner cavity (4), the inner cavity (4) is arranged in the rod body (3), the funnel guide pipe (2) is fixed in the inner cavity (4), the bottom of the funnel guide pipe (2) is connected with the top end of the through hole awl (5), the through hole awl (5) is arranged in the rod head (6), the rod head (6) is arranged at the bottom end of the rod body (3), the ventilation material (7) is arranged in the rod head (6), and the ventilation material (7) is connected with the bottom end of the through hole awl (5); the through hole awl (5) is divided into a concave head and a convex head, the inner side wall of the concave head is outwards sunken, the inner wall of the convex head is conical, the inner diameter of the conical end which is connected with the concave head is gradually reduced from one end which is far away from the concave head, and the concave head part of the through hole awl (5) is connected with the bottom end of the funnel catheter (2); the center of a circle where the center of the club head (6) is located is taken as the center, the longitudinal direction of the center of the club head (6) is taken as a symmetrical axis, and the area of the ventilation material (7) filled in the club head (6) is within the range of 5-30 degrees; the top of the ventilation material (7) is nested at the bottom end of the through hole awl (5), and the shape of the front section of the ventilation material (7) is a sector; the breathable material (7) comprises, by weight, 60% -80% of magnesia-alumina spinel, 6% -20% of graphite, 5% -15% of sawdust, 1% -2% of light-burned alumina A powder, 1% -5% of an additive, 5% -15% of a bonding agent, and metal silicon powder as the components of the additive, and thermosetting phenolic resin and liquid resin as the bonding agent, wherein the carbon residue rate of the phenolic resin is greater than or equal to 40%, and the solid content is greater than or equal to 60%.
2. The stopper rod capable of blowing argon gas efficiently and having a flocculation removal function according to claim 1, wherein the stopper rod is characterized in that: the distance between the top end of the funnel catheter (2) and the wire block (1) is 100 mm, and the wire blocks (1) are symmetrically distributed on the side wall of the inner cavity (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957106.9A CN108607980B (en) | 2018-08-21 | 2018-08-21 | Stopper rod capable of blowing argon efficiently and having flocculation removal function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957106.9A CN108607980B (en) | 2018-08-21 | 2018-08-21 | Stopper rod capable of blowing argon efficiently and having flocculation removal function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108607980A CN108607980A (en) | 2018-10-02 |
| CN108607980B true CN108607980B (en) | 2024-07-26 |
Family
ID=63666844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810957106.9A Active CN108607980B (en) | 2018-08-21 | 2018-08-21 | Stopper rod capable of blowing argon efficiently and having flocculation removal function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108607980B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020137722A1 (en) * | 2018-12-25 | 2020-07-02 | 黒崎播磨株式会社 | Continuous casting stopper and continuous casting method |
| CN110976838B (en) * | 2019-12-16 | 2021-06-15 | 首钢集团有限公司 | Casting device and method for aluminum-containing steel |
| CN111054912A (en) * | 2019-12-27 | 2020-04-24 | 泰州市旺鑫耐火材料有限公司 | Anti-oxidation stopper rod capable of automatically controlling molten steel flow rate |
| CN111822689B (en) * | 2020-07-27 | 2021-08-31 | 宝武集团马钢轨交材料科技有限公司 | High-quality steel continuous casting argon blowing stopper rod, stopper rod argon blowing system and argon blowing method |
| CN111906289B (en) * | 2020-08-27 | 2022-04-12 | 日照利尔高温新材料有限公司 | Argon blowing stopper rod and manufacturing method thereof |
| CN112743070A (en) * | 2021-01-11 | 2021-05-04 | 北京利尔高温材料股份有限公司 | Integral stopper rod for air curtain |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4791978A (en) * | 1987-11-25 | 1988-12-20 | Vesuvius Crucible Company | Gas permeable stopper rod |
| CN107298586A (en) * | 2017-07-04 | 2017-10-27 | 洛阳理工学院 | A kind of pipe line steel continuous casting anti-erosion stopper rod of tundish |
| CN108176842A (en) * | 2018-03-05 | 2018-06-19 | 北京利尔高温材料股份有限公司 | A kind of continuous casting flow control integral column of sagger |
| CN210334347U (en) * | 2018-08-21 | 2020-04-17 | 北京利尔高温材料股份有限公司 | Can high-efficient argon gas that blows just have stopper stick of getting rid of wadding and flowing function |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2165770A1 (en) * | 1971-12-30 | 1973-08-10 | Air Liquide | Stopper rod with a metal reinforcing tube - protecting the tube using liq gas |
| DE4444617A1 (en) * | 1994-12-15 | 1996-06-27 | Burkhard Labod | Arrangement for connecting a stopper rod for a metallurgical vessel to its lifting device |
| US6540009B1 (en) * | 2000-08-25 | 2003-04-01 | Akechi Ceramics Kabushiki Kaisha | Holding structure for continuous casting long stopper |
| CN1220566C (en) * | 2003-08-16 | 2005-09-28 | 青岛双鹰耐火材料有限公司 | Low carbon high aluminium integral composite plug rod |
| KR100632132B1 (en) * | 2005-03-04 | 2006-10-12 | 주식회사 하나테크 | Argon bubbling pipe for rotating melting-steel in a ladle |
| CN201049386Y (en) * | 2007-04-30 | 2008-04-23 | 山东中齐耐火材料有限公司 | Combined type piston bar for continuous casting |
| JP6630157B2 (en) * | 2016-01-19 | 2020-01-15 | 黒崎播磨株式会社 | Immersion nozzle |
| CN205519624U (en) * | 2016-02-02 | 2016-08-31 | 苏州宝明高温陶瓷有限公司 | Argon stopper stick is blown to integrative die -casting formula dispersivity |
| CN206597902U (en) * | 2017-02-16 | 2017-10-31 | 苏州宝明高温陶瓷有限公司 | A kind of stopper porous plug with high Air permenbility |
| CN108284217B (en) * | 2018-03-05 | 2020-11-13 | 北京利尔高温材料股份有限公司 | Stopper rod for purifying molten steel for continuous casting and preparation method thereof |
-
2018
- 2018-08-21 CN CN201810957106.9A patent/CN108607980B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4791978A (en) * | 1987-11-25 | 1988-12-20 | Vesuvius Crucible Company | Gas permeable stopper rod |
| CN107298586A (en) * | 2017-07-04 | 2017-10-27 | 洛阳理工学院 | A kind of pipe line steel continuous casting anti-erosion stopper rod of tundish |
| CN108176842A (en) * | 2018-03-05 | 2018-06-19 | 北京利尔高温材料股份有限公司 | A kind of continuous casting flow control integral column of sagger |
| CN210334347U (en) * | 2018-08-21 | 2020-04-17 | 北京利尔高温材料股份有限公司 | Can high-efficient argon gas that blows just have stopper stick of getting rid of wadding and flowing function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108607980A (en) | 2018-10-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108607980B (en) | Stopper rod capable of blowing argon efficiently and having flocculation removal function | |
| CN208772448U (en) | A kind of magnesium tundish flow straightener | |
| CN210334347U (en) | Can high-efficient argon gas that blows just have stopper stick of getting rid of wadding and flowing function | |
| CN204842961U (en) | Get rid of immersion nozzle of inclusion | |
| CN204818038U (en) | Seal structure at long mouth of a river of modified ladle | |
| CN204381357U (en) | A kind of stopper that can control argon flow amount | |
| CN204052882U (en) | A kind of porous stopper of continuous casting mouth | |
| CN208390996U (en) | Peritectic steel round billet continuous casting submersed nozzle | |
| CN203197234U (en) | Continuous-casting porous stopper rod | |
| CN205414339U (en) | Improve ingot mould of mould steel panel lumber recovery | |
| CN209424527U (en) | A kind of compound stalk | |
| CN109434076A (en) | A kind of aluminum alloy low-pressure casting anti-gas-leak heat preservation non-return aluminium titanates stalk | |
| US11806781B2 (en) | Submerged entry nozzle | |
| CN208945151U (en) | It drops hammer | |
| CN210848319U (en) | Discharge spout for casting | |
| CN209902241U (en) | Stopper rod for horizontal continuous casting production | |
| CN202684061U (en) | Tundish molten steel buffer device | |
| CN217315859U (en) | Anti-oxidation high-performance stopper rod | |
| CN203292439U (en) | Multi-stage shunting type continuous casting immersive nozzle | |
| CN220073255U (en) | Corrosion-resistant integral stopper rod | |
| CN202701319U (en) | Flow table for machining cast ingot and cast ingot casting device | |
| CN203253919U (en) | Sheet billet fast-replacing submerged nozzle | |
| CN201269698Y (en) | Molten metal turning mechanism | |
| CN204159857U (en) | Tundish | |
| CN220560412U (en) | Novel continuous casting tundish |
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 | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240613 Address after: 276806 middle section of Zhenjiang Road, Hushan Town, Lanshan, Rizhao City, Shandong Province Applicant after: Rizhao lier high temperature New Material Co.,Ltd. Country or region after: China Applicant after: Rizhao Ruihua New Material Technology Co.,Ltd. Address before: 102211 building 4, Xiaotangshan Industrial Park, Xiaotangshan Town, Changping District, Beijing Applicant before: BEIJING LIER HIGH-TEMPERATURE MATERIALS Co.,Ltd. Country or region before: China |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |