CN113493889A - Drill bit with wear-resistant hard alloy coating and preparation method - Google Patents
Drill bit with wear-resistant hard alloy coating and preparation method Download PDFInfo
- Publication number
- CN113493889A CN113493889A CN202110425593.6A CN202110425593A CN113493889A CN 113493889 A CN113493889 A CN 113493889A CN 202110425593 A CN202110425593 A CN 202110425593A CN 113493889 A CN113493889 A CN 113493889A
- Authority
- CN
- China
- Prior art keywords
- drill bit
- parts
- hard alloy
- coating
- wear
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a drill bit with a wear-resistant hard alloy coating and a preparation method thereof, belonging to the technical field of mechanical equipment, wherein the drill bit is provided with the hard alloy coating, and the hard alloy coating comprises the following components in parts by mass: cr (chromium) component2C332-42 parts of NiCr21-28 parts of WC 5-12 parts of TaC 5-10 parts of Co 3-5 parts of Fe. The preparation method comprises the following steps: 1) cleaning the drill bit and removing oil stains; 2) sand blasting by a drill to roughen the surface; 3) spraying, namely drying the alloy powder and spraying by using supersonic flame spraying equipment; 4) cooling, namely putting the sprayed drill bit into a cooling box for cooling; 5) and polishing, namely polishing the cooled surface of the drill bit to be smooth. The drill bit with the wear-resistant hard alloy coating and the preparation method adopt supersonic speed sprayingThe coating technology carries out surface melting coating treatment on the drill bit, and the coating contains a plurality of hard alloy powder formulas, so that the drill bit is more durable, and the service life is obviously prolonged.
Description
Technical Field
The invention relates to the field of hard alloy and drill bits, in particular to a drill bit with a wear-resistant hard alloy coating and a preparation method thereof.
Background
The hard alloy is an alloy material with a series of excellent properties of high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like, particularly the high hardness and wear resistance of the hard alloy are basically kept unchanged even at the temperature of 500 ℃, and the hard alloy still has high hardness at the temperature of 1000 ℃.
Cemented carbide is widely used as a tool material, such as turning tools, milling cutters, planing tools, drill bits, boring tools and the like, for cutting cast iron, nonferrous metals, plastics, chemical fibers, graphite, glass, stone and common steel, and also for cutting refractory steel, stainless steel, high manganese steel, tool steel and other materials which are difficult to process.
In order to further improve the hardness and wear resistance of cutter materials such as drill bits and the like, a method of spraying a hard alloy coating on the surface of the cutter materials can be adopted to improve the hardness and wear resistance of the material surface.
Disclosure of Invention
The invention aims to further improve the hardness and the wear resistance of a drill bit and provides the drill bit with a wear-resistant hard alloy coating and a preparation process method of the drill bit.
In order to achieve the purpose, the technical scheme is as follows:
the drill bit with the wear-resistant hard alloy coating is provided with the hard alloy coating, and the hard alloy coating comprises the following components in parts by mass:
Cr2C332-42 parts of NiCr21-28 parts of WC 5-12 parts of TaC 5-10 parts of Co 3-5 parts of Fe.
NiCr nichrome powder, 80% Ni-20% Cr, has high-temperature strength, oxidation resistance, corrosion resistance, fatigue resistance, fracture resistance and other comprehensive properties. Has good structure stability and use reliability at various temperatures, and is widely applied to important materials of aviation, aerospace, petroleum, chemical engineering and ships. It is widely used for manufacturing aviation jet engines and various industrial gas turbine hot end parts.
Further, the composition of the hard alloy coating is as follows:
Cr2C336.5 parts, NiCr25.8 parts, WC 8.3 parts, TaC7.6 parts, Co 4.1 parts and Fe 4.5 parts.
The preparation method of the drill bit with the wear-resistant hard alloy coating comprises the following steps:
1) cleaning the drill bit and removing oil stains;
2) sand blasting by a drill to roughen the surface;
3) spraying, wherein the alloy powder is dried and sprayed by supersonic flame spraying equipment, the spraying distance is 280mm, the oxygen-kerosene flame speed is 1600-1800m/s, the nitrogen powder feeding speed is 32-36g/min, the drill bit moving speed is 0.25-0.35m/s, and the number of sprayed layers is 38-48;
4) cooling, namely putting the sprayed drill bit into a cooling box for cooling;
5) and polishing, namely polishing the cooled surface of the drill bit to be smooth.
Further, in the spraying step, the spraying distance is 260mm, the oxygen-kerosene flame speed is 1700m/s, the nitrogen powder feeding speed is 33g/min, the drill bit moving speed is 0.28m/s, and the number of sprayed layers is 42.
The beneficial effect who adopts above-mentioned scheme does: the drill bit with the wear-resistant hard alloy coating and the preparation method adopt the supersonic speed spraying technology to carry out surface melting coating treatment on the drill bit, and the coating contains a plurality of hard alloy powder formulas, so that the drill bit is more durable, and the service life is obviously prolonged.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. The described embodiments are only some, not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The drill bit with the wear-resistant hard alloy coating is provided with the hard alloy coating, and the hard alloy coating comprises the following components in parts by mass:
Cr2C332-42 parts of NiCr21-28 parts of WC 5-12 parts of TaC 5-10 parts of Co 3-5 parts of Fe. The powder fineness is 220-350 meshes, the mixing is uniform, the fluidity is about 100s/50g, and no oxidation and oil contamination exist.
The preparation method of the drill bit with the wear-resistant hard alloy coating comprises the following steps:
1) and cleaning the drill bit and removing oil stains. Acetone and absolute ethyl alcohol can be used for removing oil stains on the surface of the drill bit
2) And the drill bit is used for sand blasting to roughen the surface. Surface blasting may be performed using quartz sand, corundum, or the like.
3) And spraying, wherein the drill is preheated to 60-80 ℃ before spraying, the alloy powder is dried at about 50 ℃, and spraying is carried out by using supersonic flame spraying equipment, wherein the spraying distance is 280mm, the oxygen-kerosene flame speed is 1600-1800m/s, the powder feeding speed of nitrogen is 32-36g/min, the moving speed of the drill is 0.25-0.35m/s, and the number of sprayed layers is 38-48. The fixed spray gun is adopted, the drill bit rotates and moves up and down, spraying is started from the front end of the drill bit, the spraying is circularly carried out for 38-48 times, and the coating thickness is 380-.
4) Cooling, namely putting the sprayed drill bit into a cooling box for cooling; the air of the cooling box needs to be dehumidified, and the humidity is kept to be about 5% -8%.
5) And polishing, namely polishing the cooled surface of the drill bit to be smooth.
The hard alloy thermal spraying coating can obviously increase the wear resistance of the surface of the drill bit, and the supersonic flame spraying is adopted to prepare the carbide-based cermet coating, so that most of carbide hard phases are retained, and the obtained coating has low porosity, high hardness and good wear resistance. The invention relates to a novel thermal spraying technology invented in the United states in 1981, and the core of a supersonic flame spraying device is a spray gun which consists of a combustion chamber, a nozzle and a long spray pipe with an equal section.
The drill bit coating prepared in example 1 was tested to determine the following parameters: the bonding strength reaches 65-75MPa, the wear resistance is 180-210 hours, the porosity is 1.1-1.3 percent, and the hardness HV0.3 is 950-1180. The service life of the drill bit can be prolonged by 20-50%.
Example 2
On the basis of example 1, the composition of the cemented carbide coating is as follows:
Cr2C336.5 parts, NiCr25.8 parts, WC 8.3 parts, TaC7.6 parts, Co 4.1 parts and Fe 4.5 parts.
In the spraying step, the spraying distance is 260mm, the oxygen-kerosene flame speed is 1700m/s, the nitrogen powder feeding speed is 33g/min, the drill bit moving speed is 0.28m/s, and the number of sprayed layers is 42.
The drill bit with the wear-resistant hard alloy coating and the preparation method adopt the supersonic speed spraying technology to carry out surface melting coating treatment on the drill bit, and the coating contains a plurality of hard alloy powder formulas, so that the drill bit is more durable, and the service life is obviously prolonged.
The drill bit coating prepared in example 2 was tested to determine the following parameters: the bonding strength reaches 74MPa, the wear resistance is more than 200 hours, the porosity is 1.2 percent, and the hardness HV0.3 is more than 1000.
Comparative example 3
On the basis of the above example 2, the WC is reduced to 3 parts, and the coating hardness HV0.3 is reduced to 850; the hardness HV0.3 of the WC bit coating was reduced to 650 without addition. The hardness of the drill coating is reduced to different degrees, and the service life of the drill is further reduced.
Comparative example 4
On the basis of the embodiment 2, the WC content is increased by 15 parts, and the bonding strength of the coating is reduced to 49 MPa; the WC content is further improved by 20 parts, the bonding strength of the coating is reduced to 41MPa, the coating is easy to scrape off, and the service life of the drill bit is further reduced.
Comparative example 5
On the basis of the above example 2, the TaC is reduced by 3 parts, and the wear resistance of the coating is reduced by 130 hours; the abrasion resistance of the coating is reduced to less than 100 hours without adding TaC. The drill life may be significantly reduced.
Comparative example 6
On the basis of the above example 2, increasing the TaC by 12 parts, the coating porosity would be 1.5; further improve TaC and be 15 parts, the coating porosity can be 1.8, and the coating wearability all can the different degree reduce, leads to drill bit life to show the reduction.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. The drill bit with the wear-resistant hard alloy coating is provided with the hard alloy coating and is characterized in that the hard alloy coating comprises the following components in parts by mass:
Cr2C332-42 parts of NiCr21-28 parts of WC 5-12 parts of TaC 5-10 parts of Co 3-5 parts of Fe.
2. The drill bit with a wear-resistant cemented carbide coating of claim 1, wherein: the hard alloy coating comprises the following components in parts by mass:
Cr2C336.5 parts, NiCr25.8 parts, WC 8.3 parts, TaC7.6 parts, Co 4.1 parts and Fe 4.5 parts.
3. The method of making a drill bit with a wear resistant cemented carbide coating of claim 1, comprising the steps of:
1) cleaning the drill bit and removing oil stains;
2) sand blasting by a drill to roughen the surface;
3) spraying, wherein the alloy powder is dried and sprayed by supersonic flame spraying equipment, the spraying distance is 280mm, the oxygen-kerosene flame speed is 1600-1800m/s, the nitrogen powder feeding speed is 32-36g/min, the drill bit moving speed is 0.25-0.35m/s, and the number of sprayed layers is 38-48;
4) cooling, namely putting the sprayed drill bit into a cooling box for cooling;
5) and polishing, namely polishing the cooled surface of the drill bit to be smooth.
4. The method for preparing a drill bit with a wear-resistant hard alloy coating according to claim 3, wherein in the spraying step, the spraying distance is 260mm, the oxygen-kerosene flame speed is 1700m/s, the nitrogen powder feeding speed is 33g/min, the drill bit moving speed is 0.28m/s, and the number of sprayed layers is 42.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110425593.6A CN113493889A (en) | 2021-04-20 | 2021-04-20 | Drill bit with wear-resistant hard alloy coating and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110425593.6A CN113493889A (en) | 2021-04-20 | 2021-04-20 | Drill bit with wear-resistant hard alloy coating and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113493889A true CN113493889A (en) | 2021-10-12 |
Family
ID=77997483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110425593.6A Pending CN113493889A (en) | 2021-04-20 | 2021-04-20 | Drill bit with wear-resistant hard alloy coating and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113493889A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114540719A (en) * | 2022-01-06 | 2022-05-27 | 温州理工学院 | Steel bonded hard alloy turning tool capable of cutting at high speed and preparation method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1488835A (en) * | 1965-10-04 | 1967-07-13 | Metco Inc | Improved Flame Spray Powder |
| EP0066782A2 (en) * | 1981-06-02 | 1982-12-15 | The Perkin-Elmer Corporation | Coating plastic substrates with minerals |
| JP2002173758A (en) * | 2000-12-04 | 2002-06-21 | Fujimi Inc | Powder for flame spraying and parts with flame sprayed coating by using the powder |
| US20080145554A1 (en) * | 2006-12-14 | 2008-06-19 | General Electric | Thermal spray powders for wear-resistant coatings, and related methods |
| US20100086398A1 (en) * | 2002-09-24 | 2010-04-08 | Ihi Corporation | Method for coating sliding surface of high-temperature member, high-temperature member and electrode for electro-discharge surface treatment |
| CN102350503A (en) * | 2011-10-21 | 2012-02-15 | 株洲硬质合金集团有限公司 | Method for producing spherical thermal-spraying powder |
| CN102441672A (en) * | 2011-11-09 | 2012-05-09 | 铜陵学院 | Method for preparing metal-based gradient coating with enhanced laser-cladding ceramic nano-particles |
| CN103045985A (en) * | 2012-12-20 | 2013-04-17 | 上海中盟石油天然气有限公司 | Surface strengthening and protection process for steel-body PDC drill bit |
| CN103103470A (en) * | 2013-01-11 | 2013-05-15 | 广州有色金属研究院 | Anti-sticking coating |
| CN107794485A (en) * | 2017-07-31 | 2018-03-13 | 湖南大学 | A kind of preparation technology of metal ceramic powder used for hot spraying |
| CN110158017A (en) * | 2019-05-22 | 2019-08-23 | 马鞍山市恒泰重工机械有限公司 | It is a kind of with fusion, thermal boundary, hard three-decker metallurgy roller surface covering |
-
2021
- 2021-04-20 CN CN202110425593.6A patent/CN113493889A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1488835A (en) * | 1965-10-04 | 1967-07-13 | Metco Inc | Improved Flame Spray Powder |
| EP0066782A2 (en) * | 1981-06-02 | 1982-12-15 | The Perkin-Elmer Corporation | Coating plastic substrates with minerals |
| JP2002173758A (en) * | 2000-12-04 | 2002-06-21 | Fujimi Inc | Powder for flame spraying and parts with flame sprayed coating by using the powder |
| US20100086398A1 (en) * | 2002-09-24 | 2010-04-08 | Ihi Corporation | Method for coating sliding surface of high-temperature member, high-temperature member and electrode for electro-discharge surface treatment |
| US20080145554A1 (en) * | 2006-12-14 | 2008-06-19 | General Electric | Thermal spray powders for wear-resistant coatings, and related methods |
| CN102350503A (en) * | 2011-10-21 | 2012-02-15 | 株洲硬质合金集团有限公司 | Method for producing spherical thermal-spraying powder |
| CN102441672A (en) * | 2011-11-09 | 2012-05-09 | 铜陵学院 | Method for preparing metal-based gradient coating with enhanced laser-cladding ceramic nano-particles |
| CN103045985A (en) * | 2012-12-20 | 2013-04-17 | 上海中盟石油天然气有限公司 | Surface strengthening and protection process for steel-body PDC drill bit |
| CN103103470A (en) * | 2013-01-11 | 2013-05-15 | 广州有色金属研究院 | Anti-sticking coating |
| CN107794485A (en) * | 2017-07-31 | 2018-03-13 | 湖南大学 | A kind of preparation technology of metal ceramic powder used for hot spraying |
| CN110158017A (en) * | 2019-05-22 | 2019-08-23 | 马鞍山市恒泰重工机械有限公司 | It is a kind of with fusion, thermal boundary, hard three-decker metallurgy roller surface covering |
Non-Patent Citations (1)
| Title |
|---|
| 徐滨士等: "《表面工程的理论与技术（第2版）》", 30 April 2010, 国防工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114540719A (en) * | 2022-01-06 | 2022-05-27 | 温州理工学院 | Steel bonded hard alloy turning tool capable of cutting at high speed and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101345044B1 (en) | Wear resistant low friction coating composition, coated components, and method for coating thereof | |
| CN101988195B (en) | Method for preparing wear-resisting high-temperature resisting oxidation NiCr-Cr3C2 metal ceramic coating | |
| CN102418065A (en) | Composite metal carbide wear-resistant coating and preparation process thereof | |
| Datta et al. | Modeling of plasma spray coating process using statistical regression analysis | |
| CN109628871B (en) | Wear-resistant erosion-resistant anti-burning coating for aluminum alloy guide rail and preparation and application thereof | |
| Dzhurinskiy et al. | Microstructure and wear properties of atmospheric plasma-sprayed Cr3C2-NiCr composite coatings | |
| JP2008144272A (en) | Environmentally friendly wear resistant carbide coating | |
| CN106906437B (en) | A kind of turbine blade high corrosion resistant scale prevention coating and its preparation process | |
| CN113493889A (en) | Drill bit with wear-resistant hard alloy coating and preparation method | |
| Fauchais et al. | Industrial applications of thermal spraying technology | |
| Kulu et al. | Selection criteria for wear resistant powder coatings under extreme erosive wear conditions | |
| CN113369543B (en) | Wear-resistant alloy coating drill bit and preparation method thereof | |
| CN108893696A (en) | A kind of nano-carbide enhancing tungsten carbide-base composite powder that highly resistance erosion and antiknock are split, coating and preparation method thereof | |
| CN113652624B (en) | Tungsten carbide/silicon carbide based composite material and coating suitable for oxygen-propane supersonic flame short-distance spraying and preparation method thereof | |
| CN108893695B (en) | Cavitation-erosion-resistant nano carbide reinforced tungsten carbide-based composite powder, coating and preparation method thereof | |
| Mazouzi et al. | Effect of annealing temperature on the microstructure evolution, mechanical and wear behavior of NiCr–WC–Co HVOF-sprayed coatings | |
| CN106591829A (en) | Abrasion-resistant coating and manufacturing method, application and gear milling cutter thereof | |
| CN109371392B (en) | Nickel-based wear-resistant corrosion-resistant coating composition for marine hydraulic piston rod, coating and preparation method of coating | |
| Pavan et al. | Review of ceramic coating on mild steel methods, applications and opportunities | |
| Özorak et al. | Wear and microstructural properties of coatings on Weldox 700 steel | |
| Mruthunjaya et al. | Characterization and hot erosion behaviour of CrC-NiCr ciated steel using HVOF technique | |
| Di Girolamo et al. | Thermally sprayed coatings for high-temperature applications | |
| Kucuk et al. | Ferrochromium slag as a protective coating material against oxidation for caster rolls | |
| Verma et al. | Cyclic oxidation behaviour and characterization of HVOF deposited inconel 718 coatings at 700° C | |
| JP2013032578A (en) | Target and hard coating coated cutting tool |
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 |