CN108299873B - Insulating antioxidant coating for electroslag casting - Google Patents
Insulating antioxidant coating for electroslag casting Download PDFInfo
- Publication number
- CN108299873B CN108299873B CN201610782590.7A CN201610782590A CN108299873B CN 108299873 B CN108299873 B CN 108299873B CN 201610782590 A CN201610782590 A CN 201610782590A CN 108299873 B CN108299873 B CN 108299873B
- Authority
- CN
- China
- Prior art keywords
- coating
- antioxidant
- electroslag casting
- insulating
- crystallizer
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Mold Materials And Core Materials (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention aims to provide an insulating and high-temperature anti-oxidation coating coated on the surfaces of a consumable electrode and the inner wall of a crystallizer in an electroslag casting production process, which is prepared by mixing alumina powder, calcium fluoride, an antioxidant, a binder, a suspending agent and a solvent, wherein the mass ratio of the calcium fluoride: alumina powder: antioxidant: adhesive: suspending agent: solvent ═ 1.8-2.2:4.5-5.5:0.4-0.6:0.7-1.3:0.4-0.6: 2-4. The coating can weaken the tendency of the consumable electrode to generate ferric oxide under the high-temperature baking of the slag bath, and can effectively prevent the condition that the arc is generated by the contact short circuit of the electrode and the crystallizer to damage the crystallizer under the condition that the safety clearance is too small.
Description
Technical Field
The invention relates to a high-temperature protective coating used on the surface of a consumable electrode in an electroslag casting production process of a special-shaped slab with a very large width-thickness ratio, and particularly provides a high-temperature insulating anti-oxidation coating applied to the surface of an electrode in an electroslag casting industry and a preparation method thereof.
Background
Electroslag casting has the advantages of refining and solidification, and becomes an important production method of high-quality castings. In the electroslag casting process, the electrode is embedded into a high-temperature slag bath, the central temperature of the slag bath reaches 1700-1900 ℃, partial electrodes outside the surface of the slag bath are easy to oxidize, oxide skin is formed on the surface of the electrode, the oxide skin is brought into slag along with the downward movement of the electrode and then enters steel through diffusion, the oxygen content of the steel is increased, the distribution is uneven, and the metallurgical purity of an electroslag casting is reduced.
In addition, for electroslag casting of the special-shaped slab with large width-thickness ratio, the safety gap at the local position is small, and with the casting process, the situation that the electrode is in contact with the crystallizer to cause short circuit, further electric arc damages the crystallizer, and the casting process is forced to be finished to cause waste products is easily caused.
Disclosure of Invention
The invention aims to provide a high-temperature anti-oxidation anti-corrosion coating coated on the surfaces of a consumable electrode and the inner wall of a crystallizer in an electroslag casting production process, which can weaken the tendency of the consumable electrode to generate ferric oxide under the high-temperature baking of a slag bath, and can effectively prevent the condition that the crystallizer is damaged by electric arc generated by short circuit due to the contact of the electrode and the crystallizer under the condition that a safety gap is too small.
The technical scheme adopted by the invention is as follows:
an insulating antioxidant coating for electroslag casting is characterized in that: the coating is prepared by mixing alumina powder, calcium fluoride, an antioxidant, a binder, a suspending agent and a solvent;
the mass ratio of the calcium fluoride: alumina powder: antioxidant: adhesive: suspending agent: solvent 1.8-2.2:4.5-5.5:0.4-0.6:0.7-1.3:0.4-0.6: 2-4. The preferable mixture ratio is calcium fluoride: alumina powder: antioxidant: adhesive: suspending agent: solvent 2: 5: 0.5: 1: 0.5: 3. the coating prepared by the optimized proportion has good insulation and oxidation resistance under the condition of a small safety gap of 100V.
Wherein the granularity of the alumina powder is less than or equal to 15 mu m, the granularity of the calcium fluoride is less than or equal to 50 mu m, and the granularity of the antioxidant is less than or equal to 5 mu m.
The invention relates to an insulating antioxidant coating for electroslag casting, which is characterized in that: the antioxidant is boron nitride, the binder is epoxy resin, the suspending agent is industrial sodium bentonite, and the solvent is water.
The preparation method of the insulating antioxidant coating for electroslag casting comprises the following steps: putting the solvent into a container with a stirrer, stirring at a low speed (preferably 10-40rpm), adding the suspending agent while stirring, uniformly stirring at a high speed (preferably 60-80rpm), adding the binder, continuously stirring uniformly, sequentially adding the calcium fluoride, the alumina powder and the antioxidant, and sufficiently and uniformly stirring to obtain the calcium fluoride-aluminum oxide-zinc oxide-calcium-zinc-.
The insulating antioxidant coating for electroslag casting is coated on the surfaces of a consumable electrode and the inner wall of a crystallizer in the electroslag casting production process to realize the functions of high temperature oxidation resistance and corrosion resistance, and the specific use method comprises the following steps:
1) polishing the consumable electrode and the surface of the crystallizer copper plate to metallic luster, and uniformly stirring the coating;
2) coating the surface of the consumable electrode and the crystallizer with a coating brush, wherein the thickness of a single layer is less than 1mm, and after coating, baking the coating by adopting flame or in a furnace (preferably 200 ℃) until the coating is solidified;
3) and repeating the step 2) until the thickness of the electrode and crystallizer surface coating is 2-4mm, thus obtaining the product.
The insulating antioxidant coating can effectively reduce the content of unstable oxides in a slag bath, thereby improving the metallurgical quality of a casting, and eliminating the phenomenon of contact short circuit between an electrode and a crystallizer, thereby improving the stability of a casting process.
Detailed Description
Example 1
An insulating antioxidant coating for electroslag casting is prepared by mixing filler calcium fluoride, alumina powder, boron nitride, epoxy resin, industrial sodium bentonite and water, and the mass ratio is 1.8: 4.5: 0.4: 0.7: 0.4: 2.
the preparation method comprises the following steps: putting water into a container with a stirrer, stirring at low speed (40rpm), adding industrial sodium bentonite while stirring, uniformly stirring at high speed (80rpn), adding epoxy resin, continuously stirring uniformly, sequentially adding calcium fluoride, alumina powder and boron nitride, and sufficiently and uniformly stirring to obtain the product.
And coating the obtained coating on the surface of a carbon steel plate with the thickness of 20mm by adopting coating brush, wherein the thickness of a single layer is less than 1mm, baking the coating by adopting flame after coating until the coating is solidified, repeatedly coating the coating on the surface of the carbon steel plate until the thickness of the coating is 3mm, and carrying out a short circuit test (U is 45v) by adopting manual arc welding without breakdown.
Example 2
An insulating antioxidant coating for electroslag casting is prepared by mixing filler calcium fluoride, alumina powder, boron nitride, epoxy resin, industrial sodium bentonite and water, and the mass ratio is 2.2: 5.5: 0.6: 1.3: 0.6: 4.
the prepared coating is coated on the surface of a consumable electrode and the surface of a crystallizer of a certain product according to the method in the embodiment 1, the consumable electrode is contacted with a copper plate of the crystallizer in the casting process (the casting voltage U is given to be 100v), the short circuit phenomenon does not occur, the casting process is stably carried out, the conventional chemical components and the mechanical properties of the product are consistent with those of the product without the coating, the oxygen content is reduced to 80ppm from 130ppm of the electrode, and the metallurgical quality of the product is improved.
Example 3
An insulating antioxidant coating for electroslag casting is prepared by mixing filler calcium fluoride, alumina powder, boron nitride, epoxy resin, industrial sodium bentonite and water, and the mass ratio is 2: 5: 0.5: 1: 0.5: 3.
the prepared coating is coated on the consumable electrode of the slab with large width-thickness ratio and the surface of a crystallizer according to the method of example 1, the casting process is carried out stably (the given casting voltage U is 80v-130v), and the oxygen content is reduced from 115ppm of the electrode to 70 ppm. The metallurgical quality of the product is improved.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. An insulating antioxidant coating for electroslag casting is characterized in that: the coating is prepared by mixing alumina powder, calcium fluoride, an antioxidant, a binder, a suspending agent and a solvent;
the mass ratio of the calcium fluoride: alumina powder: antioxidant: adhesive: suspending agent: solvent 1.8-2.2:4.5-5.5:0.4-0.6:0.7-1.3:0.4-0.6: 2-4;
the granularity of the alumina powder is less than or equal to 15 mu m, the granularity of the calcium fluoride is less than or equal to 50 mu m, and the granularity of the antioxidant is less than or equal to 5 mu m.
2. The insulating antioxidant coating for electroslag casting according to claim 1, wherein: the antioxidant is boron nitride.
3. The insulating antioxidant coating for electroslag casting according to claim 1, wherein: the binder is epoxy resin.
4. The insulating antioxidant coating for electroslag casting according to claim 1, wherein: the suspending agent is industrial sodium bentonite.
5. The insulating antioxidant coating for electroslag casting according to claim 1, wherein: the solvent is water.
6. The insulating antioxidant coating for electroslag casting according to claim 1, wherein: the mass ratio of the raw materials is as follows: alumina powder: antioxidant: adhesive: suspending agent: solvent 2: 5: 0.5: 1: 0.5: 3.
7. a method for preparing the insulating antioxidant coating for electroslag casting according to claim 1, which is characterized in that: putting the solvent into a container with a stirrer, stirring at the speed of 10-40rpm, adding the suspending agent while stirring, uniformly stirring at the speed of 60-80rpm, adding the binder, continuously and uniformly stirring, and then sequentially adding the calcium fluoride, the alumina powder and the antioxidant, and uniformly stirring to obtain the calcium fluoride-alumina composite material.
8. The use of the insulating antioxidant coating for electroslag casting according to claim 1, wherein: the coating is used for coating the surfaces of a consumable electrode and the inner wall of a crystallizer in the electroslag casting production process to realize the functions of high temperature oxidation resistance and corrosion resistance, and the specific use method comprises the following steps:
1) polishing the consumable electrode and the surface of the crystallizer copper plate to metallic luster, and uniformly stirring the coating;
2) coating the surface of the consumable electrode and the crystallizer with a coating brush, wherein the thickness of a single layer is less than 1mm, and after coating, baking with flame or in a furnace until the coating is solidified;
3) and repeating the step 2) until the thickness of the electrode and crystallizer surface coating is 2-4mm, thus obtaining the product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610782590.7A CN108299873B (en) | 2016-08-31 | 2016-08-31 | Insulating antioxidant coating for electroslag casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610782590.7A CN108299873B (en) | 2016-08-31 | 2016-08-31 | Insulating antioxidant coating for electroslag casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108299873A CN108299873A (en) | 2018-07-20 |
| CN108299873B true CN108299873B (en) | 2020-11-06 |
Family
ID=62871600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610782590.7A Active CN108299873B (en) | 2016-08-31 | 2016-08-31 | Insulating antioxidant coating for electroslag casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108299873B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035835A (en) * | 1988-03-16 | 1989-09-27 | 中国科学院化工冶金研究所 | Antioxidant protective paint for carbon product |
| CN102352144A (en) * | 2011-08-18 | 2012-02-15 | 山西太钢不锈钢股份有限公司 | Preparation method of antioxidation paint for electrodes |
| CN102430703A (en) * | 2011-12-27 | 2012-05-02 | 沈阳铸造研究所 | Carburization prevention coating for ultralow carbon stainless steel casting |
| CN103183973A (en) * | 2013-04-07 | 2013-07-03 | 昆明理工大学 | Anti-oxidative and corrosion-resistant coating of electrolytic aluminum pre-baked anode steel claw and preparation method thereof |
| CN103642284A (en) * | 2013-12-12 | 2014-03-19 | 江西恒大高新技术股份有限公司 | High-temperature anti-oxidation coating of high-temperature graphite electrode |
-
2016
- 2016-08-31 CN CN201610782590.7A patent/CN108299873B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035835A (en) * | 1988-03-16 | 1989-09-27 | 中国科学院化工冶金研究所 | Antioxidant protective paint for carbon product |
| CN102352144A (en) * | 2011-08-18 | 2012-02-15 | 山西太钢不锈钢股份有限公司 | Preparation method of antioxidation paint for electrodes |
| CN102430703A (en) * | 2011-12-27 | 2012-05-02 | 沈阳铸造研究所 | Carburization prevention coating for ultralow carbon stainless steel casting |
| CN103183973A (en) * | 2013-04-07 | 2013-07-03 | 昆明理工大学 | Anti-oxidative and corrosion-resistant coating of electrolytic aluminum pre-baked anode steel claw and preparation method thereof |
| CN103642284A (en) * | 2013-12-12 | 2014-03-19 | 江西恒大高新技术股份有限公司 | High-temperature anti-oxidation coating of high-temperature graphite electrode |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108299873A (en) | 2018-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111411372B (en) | Preparation method of rare earth iron alloy | |
| CN104446544B (en) | The production method of bottom convertor tuyere area refractory brick | |
| CN102951898B (en) | A kind of anode steel claw protection ring and preparation method thereof | |
| CN108821785B (en) | Slag adhesion preventing coating for hot rolling heating furnace water beam heat insulation lining | |
| CN103183973B (en) | Anti-oxidative and corrosion-resistant coating of electrolytic aluminum pre-baked anode steel claw and preparation method thereof | |
| CN108299873B (en) | Insulating antioxidant coating for electroslag casting | |
| CN101602611B (en) | Raw material formulation of ladle heat insulation cover and preparation method of ladle heat insulation cover | |
| CN117720341A (en) | Preparation method of magnesia-alumina spinel-carbon refractory material with rare earth as antioxidant | |
| CN102584258B (en) | Coating capable of reducing heating oxidation burning loss of steel billets | |
| CN103880443A (en) | Stopper rod head for continuously casting high-manganese and high-oxygen steel | |
| CN107954748B (en) | Slag-corrosion-resistant refractory material | |
| CN111201209A (en) | Method for producing a fused mass having a high zirconia content | |
| CN104725079A (en) | Method for forming smooth and compact layer on surface of carbon-containing refractory material | |
| CN106588049B (en) | Silicon-free carbon-free corundum nozzle stopper rod product for continuous casting and preparation process thereof | |
| CN105272312A (en) | Spinel combined long-life electric induction furnace lining material | |
| CN103992123A (en) | Brushing-resistant submerged-nozzle inner wall for continuously casting high-manganese high-oxygen steel | |
| US765001A (en) | Process of manufacturing vanadium and its alloys. | |
| CA3154990C (en) | Method of protection of the cathode blocks of aluminium reduction cells with baked anodes, protective composite mixture and coating | |
| CN110526714B (en) | Silicon carbide ramming paste for aluminum electrolysis cell cathode and preparation method thereof | |
| CN107043276B (en) | Graphite electrode protection method | |
| CN102517457B (en) | Method for utilizing graphite-clay crucible to smelt magnesium or magnesium alloy | |
| CN102517456B (en) | Method utilizing graphite-clay crucible to smelt magnesium or magnesium alloy | |
| CN102352144B (en) | Preparation method of antioxidation paint for electrodes | |
| CN104001883A (en) | Submersed nozzle for washing resistance of continuous-casting high manganese and high oxygen steel | |
| CN103739300B (en) | Composite oxygen-blowing pipe coating |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 110022 No. 17 Yunfeng Street South, Tiexi District, Liaoning, Shenyang Patentee after: Shenyang Foundry Research Institute Co., Ltd. of China National Machinery Research Institute Group Address before: 110022 No. 17 Yunfeng Street South, Tiexi District, Liaoning, Shenyang Patentee before: SHENYANG RESEARCH INSTITUTE OF FOUNDRY Co.,Ltd. Address after: 110022 No. 17 Yunfeng Street South, Tiexi District, Liaoning, Shenyang Patentee after: SHENYANG RESEARCH INSTITUTE OF FOUNDRY Co.,Ltd. Address before: 110022 No. 17 Yunfeng Street South, Tiexi District, Liaoning, Shenyang Patentee before: Shenyang Research Institute OF Foundry |