CN115323269A - Method for controlling cracks of Q235 round steel under high drawing speed condition - Google Patents
Method for controlling cracks of Q235 round steel under high drawing speed condition Download PDFInfo
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- CN115323269A CN115323269A CN202210858873.0A CN202210858873A CN115323269A CN 115323269 A CN115323269 A CN 115323269A CN 202210858873 A CN202210858873 A CN 202210858873A CN 115323269 A CN115323269 A CN 115323269A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 77
- 239000010959 steel Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007670 refining Methods 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 238000005266 casting Methods 0.000 claims description 14
- 238000009749 continuous casting Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 8
- 239000005997 Calcium carbide Substances 0.000 claims description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 6
- 239000011572 manganese Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims 8
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000009489 vacuum treatment Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 206010039509 Scab Diseases 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the field of round steel rolling, and particularly discloses a method for controlling cracks of Q235 round steel under a high-pulling-speed condition, wherein the Q235 round steel comprises the following chemical components in percentage by weight: c:0.13 to 0.17%, si:0.10 to 0.15%, mn:0.40 to 0.70 percent, more than 0.015 percent and less than or equal to 0.022 percent of P, more than 0.01 percent and less than or equal to 0.015 percent of S, more than 0.11 percent and less than or equal to 0.30 percent of Cr, more than 0.10 percent and less than or equal to 0.50 percent of Ni, more than 0.05 percent and less than or equal to 0.40 percent of Cu, less than 0.006 percent of N, controlling the Mn/S to be more than 15, the Mn/Si to be more than 2.5, and the balance of Fe and inevitable impurities. According to the invention, by controlling the weight percentage content of the specific chemical component composition of the molten steel before the smelting of the converter and the molten steel at the end point of the converter, the Q235 round steel with the chemical component composition and the weight percentage meeting the requirements is obtained without deep deoxidation of the molten steel in the traditional process by LF refining, VD vacuum treatment and the like, so that the smelting cost is reduced, and meanwhile, when the Q235 round steel is rolled under the subsequent high-pulling-speed condition, the generation of cracks and the size of the cracks can be effectively reduced.
Description
Technical Field
The invention relates to the field of round steel rolling, in particular to a method for controlling cracks of Q235 round steel under a high drawing speed condition.
Background
Q235 is carbon structural steel, generally is round steel, and general specification is between 6.0-70m, and the specification is bigger has high requirements for surface quality, and is higher for continuous casting billet quality, along with the development and application of high-efficient continuous casting technique, continuous casting drawing speed is higher and higher, and production efficiency improves, but rolled stock has appeared a plurality of problems such as scab, chipping, crackle, pockmark.
The following factors are mainly involved in the above problems: 1) The production efficiency is improved, the production rhythm is accelerated, and the inclusions in molten steel are improved; 2) In order to adapt to high-pulling-speed production, the crystallizer and the secondary cooling chamber are improved to different degrees by continuous casting, so that the cooling efficiency is improved, the quality of a casting blank is reduced, and the macroscopic cracks are difficult to control; 3) Q235 round steel has low market profit, is not suitable for alloy and has complicated production process; 4) The key process is not strict, and the quality of the casting blank is unstable.
Disclosure of Invention
The invention aims to provide a method for controlling cracks of Q235 round steel under a high drawing speed condition, and the method is used for solving the problem that a large number of cracks are easy to occur in the Q235 round steel produced by the existing rolling process.
In order to realize the purpose, the application provides a Q235 round steel under the condition of high pulling speed, which is characterized in that: the Q235 round steel comprises the following chemical components in percentage by weight: c:0.13 to 0.17%, si:0.10 to 0.15%, mn:0.40 to 0.70 percent, more than 0.015 percent and less than or equal to 0.022 percent of P, more than 0.01 percent and less than or equal to 0.015 percent of S, more than 0.11 percent and less than or equal to 0.30 percent of Cr, more than 0.10 percent and less than or equal to 0.50 percent of Ni, more than 0.05 percent and less than or equal to 0.40 percent of Cu, less than 0.006 percent of N, controlling the Mn/S to be more than 15, the Mn/Si to be more than 2.5, and the balance of Fe and inevitable impurities.
A method for controlling Q235 round steel cracks under a high drawing speed condition comprises the following steps:
s1, smelting in a converter:
charging molten iron and high-quality scrap steel into an electric furnace, blowing oxygen into the electric furnace, adding calcium carbide into the electric furnace after tapping the steel in the converter for slag treatment, adding a strong deoxidizer into the electric furnace for deoxidation during tapping, adding medium carbon ferromanganese and silicon-manganese alloy for adjusting components, and refining to obtain converter end-point molten steel;
s2, refining by a refining station:
feeding a SiCa wire after the converter end-point molten steel obtained in the step S1 enters a refining station, and soft argon blowing after the SiCa wire is fed to obtain refined molten steel;
s3, continuous casting:
continuously casting the refined molten steel obtained in the step S2 to obtain a casting blank;
s4, rolling:
and (4) carrying out heat treatment on the casting blank obtained in the step (3), rolling to obtain Q235 round steel, and cooling to detect surface cracks of the round steel.
In the scheme, the weight percentage content requirement of the specific chemical composition of the molten iron in the S1 is as follows: si is less than or equal to 0.60 percent, S is less than or equal to 0.03 percent, P is less than or equal to 0.015 percent, and the temperature T of the molten iron is more than or equal to 1250 ℃.
In the scheme, the specific chemical composition of the molten steel at the end point of the transfer furnace in S1 comprises the following components in percentage by weight: c is more than or equal to 0.07 percent, P is less than or equal to 0.018 percent, and S is less than or equal to 0.02 percent.
In the scheme, the slag discharging amount of the S1 after the addition of the calcium carbide for slag treatment is less than 50mm.
In the scheme, the S1 medium-strength deoxidizer adopts high-aluminum ferromanganese.
In the scheme, oxygen of molten steel entering the refining station in S2 is controlled within 120ppm, and oxygen of molten steel leaving the refining station is controlled within 50 ppm.
In the scheme, the continuous casting specific water amount in the continuous casting in the S3 is controlled to be 1.3-1.65 Kg/L.
In the scheme, the temperature difference between the head temperature and the middle and tail temperatures is within 50 ℃ when the casting blank is subjected to heat treatment in S4, and the temperature in the rolling process is controlled to be 1080-1150 ℃.
Compared with the prior art, the method for controlling the Q235 round steel cracks under the high drawing speed condition has the following beneficial effects:
the method has simple process, and can effectively reduce the generation of cracks and the size of the cracks when the Q235 round steel is rolled under the subsequent high-pulling-speed condition while reducing the smelting cost by controlling the weight percentage content of the specific chemical component compositions of the molten steel before the smelting of the converter and the molten steel at the end point of the converter and obtaining the Q235 round steel with the chemical component compositions and the weight percentages meeting the requirements under the condition that the molten steel needs to be subjected to deep deoxidation such as LF refining, VD vacuum treatment and the like in the traditional process.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. 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 application.
The utility model provides a Q235 round steel under high pulling speed condition which characterized in that: the Q235 round steel comprises the following chemical components in percentage by weight: c:0.13 to 0.17%, si:0.10 to 0.15%, mn:0.40 to 0.70 percent, more than 0.015 percent and less than or equal to 0.022 percent of P, more than 0.01 percent and less than or equal to 0.015 percent of S, more than 0.11 percent and less than or equal to 0.30 percent of Cr, more than 0.10 percent and less than or equal to 0.50 percent of Ni, more than 0.05 percent and less than or equal to 0.40 percent of Cu, less than 0.006 percent of N, controlling the Mn/S to be more than 15, the Mn/Si to be more than 2.5, and the balance of Fe and inevitable impurities.
A method for controlling Q235 round steel cracks under a high drawing speed condition comprises the following steps:
s1, smelting in a converter:
charging molten iron and high-quality scrap steel into an electric furnace, blowing oxygen into the electric furnace, adding calcium carbide into the electric furnace after tapping the steel, carrying out slag treatment, adding a strong deoxidizer into the electric furnace for deoxidation during tapping, adding medium carbon ferromanganese and silicon-manganese alloy for adjusting components, and refining to obtain the molten steel at the end point of the converter.
Wherein the molten iron mixed with the high-quality scrap steel comprises the following specific chemical components in percentage by weight: si is less than or equal to 0.60 percent, S is less than or equal to 0.03 percent, P is less than or equal to 0.015 percent, the temperature T of molten iron is more than or equal to 1250 ℃, and the content requirements of specific chemical components of molten steel at the end point of the converter after mixing in percentage by weight are as follows: more than or equal to 0.07 percent of C, less than or equal to 0.018 percent of P, less than or equal to 0.02 percent of S, less than 50mm of slag discharging amount when calcium carbide is added for slag treatment, and high-aluminum ferromanganese is adopted as a strong deoxidizer. And when the electric furnace is smelted, the furnace condition needs to be good, the smoke hood and the oxygen lance leak water, large-area furnace repairing and the like can not be used for smelting.
S2, refining by a refining station:
and (3) feeding a SiCa wire after the converter end-point molten steel obtained in the step (S1) enters a refining station, and soft argon blowing after the SiCa wire is fed to obtain refined molten steel.
Wherein, siCa is fed to modify MnS and Al2O3 inclusions, thereby facilitating the floating of the inclusions, purifying molten steel, the soft argon blowing time is not less than 5min, the oxygen of the molten steel entering a refining station is controlled within 120ppm, the oxygen of the molten steel leaving the refining station is controlled within 50ppm, and sampling and oxygen determination are carried out after argon blowing for 2 min.
S3, continuous casting:
and (3) continuously casting the refined molten steel obtained in the step (S2) to obtain a casting blank, wherein the continuous casting ratio water of the continuous casting is controlled to be 1.3-1.65 Kg/L.
S4, rolling:
and (4) carrying out heat treatment on the casting blank obtained in the step (3), rolling to obtain Q235 round steel, and cooling to detect surface cracks of the round steel. The difference between the head temperature and the middle and tail temperature is within 50 ℃ when the casting blank is subjected to heat treatment before rolling, and the temperature in the rolling process is controlled to be 1080-1150 ℃.
After the rolling is finished and the steel is naturally cooled, according to the Q235 round steel subjected to process optimization in the embodiment, under the condition that the chemical composition and the weight percentage content of the Q235 round steel meet the requirements, the rolled finished product basically has no visible defects such as cracks, scratches, scabs, folds, ears, inclusions and the like, and only can be subjected to individual small scratches, indentations and small cracks with the depth of less than or equal to 0.2mm, which are acceptable and not more than half of the dimensional tolerance.
The above-listed detailed description is only a specific description of possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a Q235 round steel under high pulling speed condition which characterized in that: the Q235 round steel comprises the following chemical components in percentage by weight: c:0.13 to 0.17%, si:0.10 to 0.15%, mn:0.40 to 0.70 percent, more than 0.015 percent and less than or equal to 0.022 percent of P, more than 0.01 percent and less than or equal to 0.015 percent of S, more than 0.11 percent and less than or equal to 0.30 percent of Cr, more than 0.10 percent and less than or equal to 0.50 percent of Ni, more than 0.05 percent and less than or equal to 0.40 percent of Cu, less than 0.006 percent of N, controlling the Mn/S to be more than 15, the Mn/Si to be more than 2.5, and the balance of Fe and inevitable impurities.
2. The method for controlling cracking of Q235 round steel under high drawing speed condition as claimed in claim 1, wherein: the method comprises the following steps:
s1, smelting in a converter:
charging molten iron and high-quality scrap steel into an electric furnace, blowing oxygen into the electric furnace, adding calcium carbide into the electric furnace after tapping the steel in the converter for slag treatment, adding a strong deoxidizer into the electric furnace for deoxidation during tapping, adding medium carbon ferromanganese and silicon-manganese alloy for adjusting components, and refining to obtain converter end-point molten steel;
s2, refining by a refining station:
feeding a SiCa wire after the converter end-point molten steel obtained in the step S1 enters a refining station, and soft argon blowing after the SiCa wire is fed to obtain refined molten steel;
s3, continuous casting:
continuously casting the refined molten steel obtained in the step (S2) to obtain a casting blank;
s4, rolling:
and (4) carrying out heat treatment on the casting blank obtained in the step (3), rolling to obtain Q235 round steel, and cooling to detect surface cracks of the round steel.
3. The method for controlling the cracking of the Q235 round steel under the high-pulling-speed condition as claimed in claim 2, wherein the method comprises the following steps: the weight percentage content requirement of the specific chemical components of the molten iron in the S1 is as follows: si is less than or equal to 0.60 percent, S is less than or equal to 0.03 percent, P is less than or equal to 0.015 percent, and the temperature T of the molten iron is more than or equal to 1250 ℃.
4. The method for controlling cracking of Q235 round steel under the high drawing speed condition as claimed in claim 2, wherein: s1, the special chemical components of the molten steel at the end point of the converter are required to be in percentage by weight as follows: c is more than or equal to 0.07 percent, P is less than or equal to 0.018 percent, and S is less than or equal to 0.02 percent.
5. The method for controlling cracking of Q235 round steel under the high drawing speed condition as claimed in claim 2, wherein: and in the S1, the slag discharging amount of the slag treatment by adding the calcium carbide is less than 50mm.
6. The method for controlling cracking of Q235 round steel under the high drawing speed condition as claimed in claim 2, wherein: the S1 medium-strength deoxidizer adopts high-aluminum ferromanganese.
7. The method for controlling cracking of Q235 round steel under the high drawing speed condition as claimed in claim 2, wherein: in S2, oxygen of molten steel entering the refining station is controlled within 120ppm, and oxygen of molten steel leaving the refining station is controlled within 50 ppm.
8. The method for controlling cracking of Q235 round steel under the high drawing speed condition as claimed in claim 2, wherein: the continuous casting ratio water amount in the S3 is controlled to be 1.3-1.65 Kg/L.
9. The method for controlling cracking of Q235 round steel under the high drawing speed condition as claimed in claim 2, wherein: and S4, when the casting blank is subjected to heat treatment in the step S4, the difference between the head temperature and the middle and tail temperatures is within 50 ℃, and the temperature in the rolling process is controlled to be 1080-1150 ℃.
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| CN202210858873.0A CN115323269A (en) | 2022-07-21 | 2022-07-21 | Method for controlling cracks of Q235 round steel under high drawing speed condition |
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| WO2022127192A1 (en) * | 2020-12-18 | 2022-06-23 | 天津钢铁集团有限公司 | Low-alloy high-strength q420c steel plate and production method therefor |
| CN113913672A (en) * | 2021-09-01 | 2022-01-11 | 阳春新钢铁有限责任公司 | Method for improving impact performance of Q355 round steel |
| CN114540713A (en) * | 2022-03-01 | 2022-05-27 | 新疆八一钢铁股份有限公司 | Production method of Q235KZ anti-seismic section steel |
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