CN113600768A - Fluxing agent and method for promoting melting of casting powder in continuous casting and pouring process of steel - Google Patents
Fluxing agent and method for promoting melting of casting powder in continuous casting and pouring process of steel Download PDFInfo
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- CN113600768A CN113600768A CN202110790147.5A CN202110790147A CN113600768A CN 113600768 A CN113600768 A CN 113600768A CN 202110790147 A CN202110790147 A CN 202110790147A CN 113600768 A CN113600768 A CN 113600768A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
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Abstract
The invention provides a fluxing agent and a method for promoting melting of casting powder in a steel continuous casting pouring process, wherein the fluxing agent comprises the following raw materials in percentage by mass: 20-80% of borax, 10-50% of lithium carbonate and 0-30% of fluorite powder. The flux provided by the invention is a mixture composed of borax, lithium carbonate and fluorite powder with specific contents, and the mixture composed of three raw materials with different melting points in specific proportions is used as the flux, so that the melting point of non-metallic inclusions adsorbed by the covering slag can be obviously reduced, the performance of different steel types, particularly titanium-containing steel, is improved, the melting speed of the covering slag is increased, and adverse effects on the quality and production of continuous casting billets caused by caking, harder slag strips and other conditions due to poor melting of the covering slag are reduced and even avoided.
Description
Technical Field
The invention belongs to the technical field of metallurgical continuous casting, and particularly relates to a fluxing agent and a method for promoting melting of casting powder in a steel continuous casting pouring process.
Background
Certain alloy elements are added into steel to greatly improve certain properties of the steel, for example, T is added into low-carbon steeliThe strength of the steel can be improved, and the acid corrosion resistance of the stainless steel can be improved by adding some Ti into the stainless steel. This is due to the alloying element T in the steeliHaving a strong affinity for nitrogen and carbon, TiN and Ti(C, N) precipitation in austenite promotes grain refinement, and T is converted from austenite to ferriteiN and TiThe precipitation of (C, N) in the ferrite promotes the dispersion strengthening effect.
However containing TiT in molten steel in the continuous casting production processiThe following problems are caused: 1. t in molten steeliWill be mixed with SiO in the casting powder2Oxidation-reduction reaction occurs, so that the component change and the performance of the casting powder are deteriorated, and further the problem of casting blank surface defects and even steel leakage are caused; 2. t in molten steeliReadily form T with NiN inclusions, if TiN inclusion can not be effectively absorbed by the casting powder, and T with high melting pointiN is likely to cause surface quality problems such as crusting and nozzle nodulation.
For the above-mentioned T-containingiThe continuous casting problem of steel is improved in the prior art aiming at continuous casting covering slag, which is an important auxiliary material in the continuous casting production process and plays roles of preventing secondary oxidation, reducing molten steel heat dissipation, improving heat transfer, absorbing and dissolving non-metallic inclusions, lubricating and the like in the continuous casting protection pouring process. The traditional titanium-containing steel casting powder mainly comprises CaO and SiO2Composition, in order to adjust the viscosity and solidification temperature of the molten slag, Al is added on the basis of the traditional casting powder component in the prior art2O3、MgO、Na2O, F and Li2O and flux C, etc., although solving the T of high melting pointiN causes surface quality problems such as crusting and nozzle clogging, but in actual continuous castingIn the casting process, a large amount of high-melting-point nonmetallic inclusions such as sulfides, nitrides, oxides, silicates and the like are formed, so that the performance of the casting powder is deteriorated, the melting speed of the casting powder is reduced, the conditions of agglomeration, hard slag strips and the like occur, and production and quality accidents such as steel leakage, influence on the surface quality of casting blanks and the like can be still caused in serious cases.
Therefore, how to more effectively promote the melting of the casting powder in the continuous casting and pouring process of the steel so as to avoid the production and quality accidents of steel leakage, influence on the surface quality of a casting blank and the like is a problem to be solved urgently.
Disclosure of Invention
In view of the above, the invention provides a fluxing agent and a method for promoting the melting of casting powder in the continuous casting and pouring process of steel, wherein the fluxing agent can be used for online adjusting the melting state of the casting powder in a crystallizer in real time, so that the melting of the casting powder in the continuous casting and pouring process of steel is promoted more effectively, and the production and quality accidents such as steel leakage and the influence on the surface quality of a casting blank can be reduced or even avoided.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a fluxing agent comprises the following raw materials in percentage by mass: 20-80% of borax, 10-50% of lithium carbonate and 0-30% of fluorite powder.
The flux provided by the invention is a mixture consisting of borax, lithium carbonate and fluorite powder with specific contents, wherein the melting point of borax is 880 ℃, the melting point of lithium carbonate is 723 ℃ and the melting point of fluorite powder is 1350 ℃, and the mixture consisting of three raw materials with different melting points in specific proportions is used as the flux, so that the melting points of the casting powder and non-metallic inclusions adsorbed by the casting powder can be obviously reduced, the performances of different steel types, particularly titanium-containing steel, are improved, the melting speed of the casting powder is increased, and adverse effects on the quality and production of continuous casting billets caused by caking, hard slag strips and other conditions due to poor melting of the casting powder are reduced or even avoided.
The flux provided by the invention can adjust the proportion of the flux to the covering slag added in the continuous casting pouring process at any time according to the actual melting state of the covering slag in the crystallizer so as to ensure that the melting effect of the covering slag reaches the optimal state, improve the surface quality of the continuous casting billet (the qualified rate of the casting billet), and avoid production accidents such as steel leakage and the like.
The invention also provides a preparation method of the fluxing agent, which comprises the following steps:
and weighing the raw materials according to the raw material proportion of the fluxing agent, and mixing and crushing the raw materials to obtain the fluxing agent. The preparation method of the fluxing agent provided by the invention is simple and convenient and is easy to industrialize.
Optionally, the particle size of the fluxing agent is less than or equal to 1.5 mm.
Optionally, the proportion of the fluxing agent with the particle size of 1.0-1.5mm is less than or equal to 1 wt%, the proportion of the fluxing agent with the particle size of 0.1-1.0mm is 40-50 wt%, and the proportion of the fluxing agent with the particle size of less than 0.1mm is 50-60 wt%; wherein the particles with a particle size of 1.0mm fall within the range of 0.1-1.0 mm. The melting effect of the flux and the mold flux can be further improved by limiting the particle size and the distribution of the flux.
Optionally, the water content of the fluxing agent is less than or equal to 0.5 wt%. The quality of the continuous casting billet can be further improved and the qualification rate of the continuous casting billet can be improved by limiting the water content in the fluxing agent.
The invention also provides a method for promoting the melting of the covering slag in the steel continuous casting pouring process, which comprises the step of adding the fluxing agent and the covering slag into the crystallizer;
wherein the continuous casting is tundish protection casting;
the fluxing agent is the fluxing agent or the fluxing agent prepared by the preparation method of the fluxing agent.
The method for promoting the melting of the covering slag in the continuous casting and pouring process of the steel is only suitable for the protecting and pouring process of the tundish, and the melting state of the covering slag in the crystallizer can be adjusted in real time by adding the fluxing agent and the covering slag which needs to be added in the protecting and pouring process of the tundish into the crystallizer, so that the performance of the covering slag is improved, and the adverse effects of caking, harder slag strips and other conditions caused by the poor melting of the covering slag on the quality and the production of the continuous casting billet are reduced or even avoided. The method can effectively avoid the problem of steel leakage in the existing continuous casting pouring process, and improve the surface quality of the casting blank (the qualified rate of the casting blank).
Alternatively, the flux and the mold flux may be added simultaneously or alternately.
Alternatively, the mold flux and the mold flux may be added simultaneously using an inert gas as a carrier; or adding the fluxing agent and the casting powder alternately.
Optionally, the mass ratio of the added mold flux to the mold flux is 1: 0.1-0.4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The existing method for promoting the melting of the casting powder in the steel continuous casting process is to mix and sinter a fluxing agent and the casting powder to obtain the casting powder modified by the fluxing agent with fixed components and properties, then the casting powder modified by the fluxing agent is added periodically according to the process requirements when the pouring process is protected by a tundish, but in the actual continuous casting process, the influence of the process and other factors is influenced, for example, oxides and silicates can be formed due to the addition of a deoxidizing agent in the smelting process of steel, sulfides, nitrides and the like formed due to the reduction of the solubility of certain elements (such as sulfur and nitrogen) in the solidification process of steel, nonmetallic inclusions with high melting points and without metal properties are left in the steel without discharging at all, the existence of the nonmetallic inclusions not only deteriorates the performance of the casting powder with fixed components and reduces the melting speed of the casting powder, and the conditions of conglomeration, hard slag strips and the like can occur, and production and quality accidents such as steel leakage, influence on the surface quality of the casting blank and the like can still be caused in serious cases.
In view of the above problems, the existing research direction and thought still improve the components and characteristics of the mold flux, but the research direction and thought are not successful. The inventor overcomes the limitation of the existing research, creatively adopts the fluxing agent and the covering slag with specific components as two independent components, and mixes the fluxing agent and the covering slag with the specific components according to different proportions according to the melting state of the covering slag in a crystallizer during the continuous casting and pouring of steel, thereby adjusting the components and the characteristics of the covering slag in real time and promoting the melting of the covering slag. Compared with the prior art, the qualification rate of the casting blank obtained by the method is improved by 3.8-12%.
In addition, the fluxing agent provided by the invention mainly takes boron-based, lithium-based and other fluorine-free fluxing agents as main materials and takes fluorite powder as auxiliary materials, and the cost performance of the materials is improved by the proportion of the raw materials in the fluxing agent under the conditions of meeting production requirements and environmental protection, so that the casting blank qualification rate is improved and the cost is reduced more favorably than the use of a single material.
For this purpose, the invention provides the following solutions:
in the process of continuous casting and pouring of steel by adopting a tundish protection pouring process, an automatic slag adding device is adopted to mix the casting powder and the fluxing agent according to the proportion of 1: (0.1-0.4), and simultaneously adding the protective slag and the fluxing agent into the crystallizer by using nitrogen or other inert gases (such as helium, argon and the like) as a carrier; or the covering slag and the fluxing agent are mixed according to the proportion of 1: (0.1-0.4) manually and alternately adding the mixture into a crystallizer;
wherein, the fluxing agent comprises the following raw materials in percentage by mass: 20-80% of borax, 10-50% of lithium carbonate and 0-30% of fluorite powder, and the preparation method comprises the following steps:
weighing the raw materials according to the raw material proportion of the fluxing agent, and mixing, crushing and drying the raw materials to obtain the fluxing agent. The water content of the cosolvent is less than or equal to 0.5 wt%, the particle size is less than or equal to 1.5mm, the proportion of the particles with the particle size of 1.0-1.5mm is less than or equal to 1 wt%, the proportion of the particles with the particle size of 0.1-1.0mm is 40-50 wt%, and the proportion of the particles with the particle size of less than 0.1mm is 50-60 wt%.
The proportion, the particle size distribution and the water content of the raw materials in the fluxing agent and the mass ratio of the fluxing agent to the mold flux can be adjusted according to actual conditions.
The following examples are intended to illustrate the invention in more detail.
For convenience of comparison, the following mold flux was used in each of the following examples and comparative examples: contains CaO 28.57 wt%, MgO 1.04 wt%, and SiO231.14％，Al2O36.82％，Fe2O31.33％，K2O 0.3％，Na2O 3.97％，C16.20％，F-4.40%, the balance being ash and unavoidable impurities (determined by fluorescence analysis).
Example 1
The embodiment provides a method for promoting the melting of casting powder in the steel continuous casting pouring process, which comprises the following steps:
preparation of a fluxing agent: mixing 80kg of borax, 10kg of lithium carbonate and 10kg of fluorite powder, crushing by a crusher, and drying at 160 ℃ under 150 ℃, thus obtaining the fluxing agent.
The water content of the cosolvent is 0.5 wt% through the detection of a water content detector; through screening detection, the particle size of the fluxing agent is less than or equal to 1.5mm, the proportion of the particles with the particle size of 1.0-1.5mm (excluding 1.0mm) is less than or equal to 1 wt%, the proportion of the particles with the particle size of 0.1-1.0mm (including 1.0mm) is 40-50 wt%, and the proportion of the particles with the particle size of less than 0.1mm is 50-60 wt%.
Promoting the melting of the casting powder: the tundish protection casting continuous casting machine is adopted to produce titanium-containing steel (the content of smelting component Ti is 0.03 wt%), a large amount of slag strips are generated in the casting process, and although the slag strips are continuously fished out, the melting effect of the casting powder is still poor, and the surface quality of the continuous casting billet is poor. Therefore, four flows are adjusted on line by adopting the covering slag, the other four flows are not adjusted on line (only the covering slag is added), 20 furnaces are used totally, and the number of the continuous casting billets in each furnace is 40. When the production process for adjusting the molten state of the covering slag on line is adopted, the covering slag and the fluxing agent are added in turn in an artificial mode, and the mass ratio of the covering slag to the fluxing agent added in each batch is 1: 0.1. The number of unqualified casting blanks (waste products) obtained after online adjustment is 11 in total, the number of unqualified casting blanks (waste products) obtained without online adjustment is 42 in total, and the percent of pass of the casting blanks is improved by 3.87% after online adjustment.
Example 2
The embodiment provides a method for promoting the melting of casting powder in the steel continuous casting pouring process, which comprises the following steps:
preparation of a fluxing agent: 20kg of borax, 50kg of lithium carbonate and 30kg of fluorite powder are mixed, crushed by a crusher and dried at the temperature of 200 ℃ after being treated with 190-DEG C organic solvent, thus obtaining the fluxing agent.
The water content of the cosolvent is 0.3 wt% through the detection of a water content detector; through screening detection, the particle size of the fluxing agent is less than or equal to 1.5mm, the proportion of the particles with the particle size of 1.0-1.5mm (excluding 1.0mm) is less than or equal to 1 wt%, the proportion of the particles with the particle size of 0.1-1.0mm (including 1.0mm) is 40-50 wt%, and the proportion of the particles with the particle size of less than 0.1mm is 50-60 wt%.
Promoting the melting of the casting powder: the tundish protection casting continuous casting machine is adopted to produce titanium-containing steel (the content of smelting component Ti is 0.09 wt%), a large amount of slag strips are generated in the casting process, and although the slag strips are continuously fished out, the melting effect of the casting powder is still poor, and the surface quality of the continuous casting billet is poor. Therefore, four flows are adjusted on line by adopting the covering slag, the other four flows are not adjusted on line (only the covering slag is added), 20 furnaces are used totally, and the number of the continuous casting billets in each furnace is 40. When the production process for adjusting the molten state of the covering slag on line is adopted, the mass ratio of the covering slag to the fluxing agent is set to be 5:1, nitrogen is used as a carrier, and the mixture of the covering slag and the fluxing agent is automatically added into a crystallizer through an automatic slag adding device. The number of unqualified casting blanks (waste products) obtained by online adjustment is 70 in total, the number of unqualified casting blanks (waste products) obtained without online adjustment is 24 in total, and the percent of pass of the casting blanks is improved by 5.75 percent after online adjustment.
Example 3
The embodiment provides a method for promoting the melting of casting powder in the steel continuous casting pouring process, which comprises the following steps:
preparation of a fluxing agent: 50kg of borax and 50kg of lithium carbonate are mixed, crushed by a crusher and dried at 180 ℃ at 170 ℃, thus obtaining the fluxing agent.
The water content of the cosolvent is 0.2 wt% measured by a water content detector; through screening detection, the particle size of the fluxing agent is less than or equal to 1.5mm, the proportion of the particles with the particle size of 1.0-1.5mm (excluding 1.0mm) is less than or equal to 1 wt%, the proportion of the particles with the particle size of 0.1-1.0mm (including 1.0mm) is 40-50 wt%, and the proportion of the particles with the particle size of less than 0.1mm is 50-60 wt%.
Promoting the melting of the casting powder: the tundish protection casting continuous casting machine is adopted to produce titanium-containing steel (the content of smelting component Ti is 0.18 wt%), a large amount of slag strips are generated in the casting process, and although the slag strips are continuously fished out, the melting effect of the casting powder is still poor, and the surface quality of the continuous casting billet is poor. Therefore, four flows are adjusted on line by adopting the covering slag, the other four flows are not adjusted on line (only the covering slag is added), 20 furnaces are used totally, and the number of the continuous casting billets in each furnace is 40. When the production process for adjusting the molten state of the covering slag on line is adopted, the mass ratio of the covering slag to the fluxing agent is set to be 5:2, nitrogen is used as a carrier, and the mixture of the covering slag and the fluxing agent is automatically added into a crystallizer through an automatic slag adding device. The number of unqualified casting blanks (waste products) obtained after on-line adjustment is 123 in total, the number of unqualified casting blanks (waste products) obtained without on-line adjustment is 30 in total, and after on-line adjustment, the percent of pass of the casting blanks is improved by 11.625%.
Comparative example 1
The comparative example provides a method for promoting the melting of casting powder in the steel continuous casting pouring process, which comprises the following steps:
preparation of the flux modified mold flux: mixing 80kg of borax, 10kg of lithium carbonate and 10kg of fluorite powder, crushing by a crusher, and drying at 160 ℃ under 150 ℃, thus obtaining the fluxing agent.
The water content of the cosolvent is 0.5 wt% through the detection of a water content detector; through screening detection, the particle size of the fluxing agent is less than or equal to 1.5mm, the proportion of the particle sizes between 1.0 and 1.5mm is less than or equal to 1 wt%, the proportion of the particle sizes between 0.1 and 1.0mm is 40 wt% -50 wt%, and the proportion of the particle sizes less than 0.1mm is 50 wt% -60 wt%.
Uniformly mixing the 100kg of fluxing agent and 1000kg of protective slag, sintering for 3h at the temperature of 750-: the components of the modified covering slag after fluorescence analysis and detection are as follows: the weight percentage of the composite material is that CaO 27.5 percent, MgO0.96 percent and SiO230.2％，Al2O36.40％，Fe2O33.16％，K2O 0.40％，Na2O 4.92％，C0.28％，F-5.32％，B2O3 4.75％，Li20.62% of O, and the balance being unavoidable impurities.
Promoting the melting of the casting powder: the tundish protection casting continuous casting machine is adopted to produce titanium-containing steel (the content of smelting component Ti is 0.03 wt%), a large amount of slag strips are generated in the casting process, and although the slag strips are continuously fished out, the melting effect of the casting powder is still poor, and the surface quality of the continuous casting billet is poor. Therefore, only the modified covering slag is added into four flows, the other four flows are not adjusted (only the covering slag is added), 20 furnaces are used in total, and the number of the continuous casting billets in each furnace is 40. The mass ratio of the modified covering slag to the covering slag added in each batch is 1.1:1, the number of unqualified casting blanks (waste products) obtained by adding the flux modified covering slag is 23 in total, the number of unqualified casting blanks (waste products) obtained by adding the covering slag is 40 in total, and after online adjustment, the casting blank qualification rate is improved by 2.215%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The fluxing agent is characterized by comprising the following raw materials in percentage by mass: 20-80% of borax, 10-50% of lithium carbonate and 0-30% of fluorite powder.
2. The preparation method of the fluxing agent is characterized by comprising the following steps:
the fluxing agent is prepared by weighing the raw materials according to the raw material proportion of the fluxing agent in the claim 1, and mixing and crushing the raw materials.
3. The method for preparing the fluxing agent according to claim 2, wherein the particle size of the fluxing agent is less than or equal to 1.5 mm.
4. The method for preparing the fluxing agent according to claim 2 or 3, wherein the proportion of the particles having the particle size of 1.0 to 1.5mm in the fluxing agent is less than or equal to 1 wt%, the proportion of the particles having the particle size of 0.1 to 1.0mm in the fluxing agent is 40 wt% to 50 wt%, and the proportion of the particles having the particle size of less than 0.1mm in the fluxing agent is 50 wt% to 60 wt%.
5. A method for preparing a flux according to claim 2 or 3, wherein the flux has a water content of 0.5 wt% or less.
6. A method for promoting the melting of the covering slag in the steel continuous casting pouring process is characterized by comprising the steps of adding a fluxing agent and the covering slag into a crystallizer;
wherein the continuous casting is tundish protection casting;
the fluxing agent is the fluxing agent described in claim 1 or the fluxing agent prepared by the preparation method of the fluxing agent described in any one of claims 2 to 5.
7. The method for promoting the melting of mold flux in the continuous casting and pouring of steel according to claim 6, wherein the flux is added simultaneously or alternately with the mold flux.
8. The method for promoting the melting of mold flux in the continuous casting and pouring of steel according to claim 7, wherein the mold flux is added simultaneously with the mold flux using an inert gas as a carrier; or alternatively adding the fluxing agent and the casting powder.
9. The method for promoting the melting of mold flux during the continuous casting and pouring of steel according to any one of claims 7 to 8, wherein the mass ratio of the mold flux to be added is 1: 0.1-0.4.
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Citations (5)
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| US4327798A (en) * | 1980-05-01 | 1982-05-04 | American Cast Iron Pipe Company | Method of applying flux |
| CN101219465A (en) * | 2007-11-30 | 2008-07-16 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder special for bar plate stainless steel containing titanium and manufacturing technique thereof |
| CN101254525A (en) * | 2008-02-22 | 2008-09-03 | 马鞍山钢铁股份有限公司 | Special-shaped continuous casting containing manganses low-alloy high-strength steel crystallizer protection slag |
| CN102389955A (en) * | 2011-11-26 | 2012-03-28 | 重庆大学 | Crystallizer casting powder for high-aluminum steel continuous casting |
| CN106270429A (en) * | 2015-06-09 | 2017-01-04 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
-
2021
- 2021-07-13 CN CN202110790147.5A patent/CN113600768A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4327798A (en) * | 1980-05-01 | 1982-05-04 | American Cast Iron Pipe Company | Method of applying flux |
| CN101219465A (en) * | 2007-11-30 | 2008-07-16 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder special for bar plate stainless steel containing titanium and manufacturing technique thereof |
| CN101254525A (en) * | 2008-02-22 | 2008-09-03 | 马鞍山钢铁股份有限公司 | Special-shaped continuous casting containing manganses low-alloy high-strength steel crystallizer protection slag |
| CN102389955A (en) * | 2011-11-26 | 2012-03-28 | 重庆大学 | Crystallizer casting powder for high-aluminum steel continuous casting |
| CN106270429A (en) * | 2015-06-09 | 2017-01-04 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
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