CN113275532A - Method for preventing longitudinal crack bleed-out of continuous casting slab - Google Patents
Method for preventing longitudinal crack bleed-out of continuous casting slab Download PDFInfo
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- CN113275532A CN113275532A CN202110573120.0A CN202110573120A CN113275532A CN 113275532 A CN113275532 A CN 113275532A CN 202110573120 A CN202110573120 A CN 202110573120A CN 113275532 A CN113275532 A CN 113275532A
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- copper plate
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 125
- 229910052802 copper Inorganic materials 0.000 claims abstract description 125
- 239000010949 copper Substances 0.000 claims abstract description 125
- 208000029154 Narrow face Diseases 0.000 claims abstract description 45
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005266 casting Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005096 rolling process Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
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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
- B22D11/16—Controlling or regulating processes or operations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a method for preventing longitudinal crack bleed-out of a continuous casting slab, which comprises the steps of limiting the flatness of a narrow-face copper plate, a large-chamfer-angle copper plate and a narrow-face back plate of a crystallizer; limiting the relative positions of the wide-surface foot roller and the narrow-surface foot roller with the copper plate respectively; limiting the size of an angle seam between a wide-surface copper plate and a narrow-surface copper plate of the crystallizer; limiting the back taper of the wide-surface copper plate and the narrow-surface copper plate of the crystallizer; the precision of the oscillating unit of the crystalliser is defined. The invention improves the on-line service life of the crystallizer copper plate, controls the bulging amount of the narrow surface of the continuous casting billet, avoids the generation of longitudinal cracks and steel leakage at the corner of a slab, is beneficial to reducing the downtime of a casting machine due to the replacement of the crystallizer and the like, improves the operation rate of the casting machine and ensures the smooth production of a steel rolling interface.
Description
Technical Field
The invention belongs to the technical field of metallurgical continuous casting, and particularly relates to a method for preventing longitudinal crack bleed-out of a continuous casting slab.
Background
In the production process of a slab continuous casting machine, a molten steel flow field and a solidification condition are complex near a corner where wide and narrow surfaces of a crystallizer intersect, a blank shell is in two-dimensional heat transfer, when medium-carbon peritectic steel is poured, because the shrinkage rate is high in the initial solidification stage and the crack sensitivity is strong, the blank shell near the corner is often a weak link after the molten steel is solidified and formed in the crystallizer, the blank shell of a casting blank at the position is thin, and if a foot roll is poorly supported, the external force applied to the corner primary blank shell is aggravated to gather at the position; the molten steel is easy to infiltrate into the angle seam of the crystallizer due to the overlarge angle seam, and the integrity of the primary blank shell is damaged due to the steel embedded in the angle seam; poor arc contact causes stress concentration near the corner of the casting blank; under triple action of mechanical stress, thermal stress and bulging force, the weak part of the blank shell with uneven thickness is easily further expanded, and finally, the corner longitudinal crack of the crystallizer is formed, and the crack and steel leakage accident occurs soon (within about 1 m) after the blank shell is discharged out of the crystallizer.
A straight arc type continuous casting machine is characterized in that a crystallizer is always in a width adjustable form, a narrow-face copper plate can move on line to realize width adjustment of the crystallizer, and the problems that the back taper is reduced and the angle seam at the joint of the wide-narrow-face copper plate is enlarged due to the influence of bulging force and the like in the steel casting process are easily caused. The blank shell in the copper plate is too thin or has longitudinal cracks near the narrow face corner because of insufficient inverted taper or large steel clamping of an angle seam and the like, the support and cooling length of the blank shell on the narrow face of the casting blank after the blank shell is discharged out of the crystallizer is shorter and is not more than 1m, and crack expansion is easily caused in the subsequent operation process, so that crack breakout is caused.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a method for preventing the breakout of a continuous casting slab due to longitudinal cracks, which is used for solving the problem that the breakout is caused by the over-thin shell or the longitudinal cracks of the continuous casting slab near the corner part in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a method for preventing longitudinal crack breakout of a continuous casting slab, comprising the following steps:
the flatness of the narrow-face copper plate, the large chamfer copper plate and the narrow-face back plate of the crystallizer is limited;
limiting the relative positions of the wide-surface foot roller and the wide-surface copper plate and the narrow-surface foot roller and the narrow-surface copper plate;
limiting the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate of the crystallizer;
limiting the back taper of the wide-surface copper plate and the narrow-surface copper plate of the crystallizer;
the precision of the oscillating unit of the crystalliser is defined.
The precision stability of the equipment is improved, the back taper of the wide face and the narrow face of peritectic steel and other steel types is increased, the cooling of the foot roll is strengthened, the size of an angle seam is controlled, the relative position of the foot roll and a copper plate is reduced, the precision control of a vibration mechanism of the crystallizer is refined, the production sequence of a slab caster and the quality of a casting blank are supported, longitudinal crack steel leakage near the angle is basically eliminated, the practical significance is realized for realizing high-efficiency production, and the competitiveness of enterprises is improved.
Further, the straightness control of narrow face copper is at less than or equal to 0.5mm, the straightness control of the straight part of big chamfer copper is at less than or equal to 0.5mm, the straightness control of narrow face backplate is at less than or equal to 0.3mm, the narrow face backplate with hold the gap between the board less than or equal to 0.5 mm.
Furthermore, the relative position of the wide-surface foot roller and the lower opening of the wide-surface copper plate is configured to be 0.30-0.50 +/-0.05 mm protruding inwards per side of the wide-surface foot roller.
Further, when the crystallizer is assembled, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is controlled to be less than or equal to 0.15 mm; when the crystallizer is used, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is controlled to be less than or equal to 0.3 mm.
And further, the clamping force of a disc spring for clamping the wide-surface copper plate is limited, and the clamping force of the disc spring is larger than the combined force of the bulging force and the friction force between the inner arc water tank and the seat plate.
Further, when the hypo-peritectic steel is poured and the pulling speed of the peritectic steel is 1.00-1.80 m/min, the back taper of the narrow-face copper plate is 1.10-1.25%/m, and the back taper of the wide-face copper plate is 0.75-0.95%/m.
Further, the difference of the vertical distance between the upper opening and the lower opening of the wide-surface copper plate is at least 0.5 mm.
Further, the relative position of the narrow-face foot roller and the narrow-face copper plate is configured that the narrow-face foot roller contracts inwards by at least 0.5mm per side.
And further, when the tundish is replaced for pouring, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate at the position 400mm away from the upper opening of the crystallizer is less than or equal to 0.3 mm.
Furthermore, the height difference of the platforms of the two vibration units of the crystallizer is controlled to be less than or equal to 0.5 mm.
As described above, the method for preventing the longitudinal cracks of the continuous casting slab from leaking steel has the following beneficial effects:
1. by adopting the method, the online service life of the crystallizer copper plate is prolonged;
2. the bulging amount of the narrow surface of the continuous casting billet is controlled, so that the generation of longitudinal cracks at the corner of a slab is avoided, the downtime of a casting machine due to the replacement of a crystallizer and the like is reduced, and the operation rate of the casting machine is improved;
3. ensuring the smooth production of the steel rolling interface.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The invention provides a method for preventing longitudinal crack bleed-out of a continuous casting slab, which comprises the following measures:
the flatness of the narrow-face copper plate, the large chamfer copper plate and the narrow-face back plate of the crystallizer is limited;
limiting the relative positions of the wide-surface foot roller and the wide-surface copper plate and the narrow-surface foot roller and the narrow-surface copper plate;
limiting the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate of the crystallizer;
limiting the back taper of the wide-surface copper plate and the narrow-surface copper plate of the crystallizer;
the precision of the oscillating unit of the crystalliser is defined.
Example one
When a steel mill pours a continuous casting slab with the thickness of 250mm multiplied by 2000mm, the method of the invention is adopted, and when the crystallizer is assembled, the straightness of the narrow-face copper plate is controlled to be less than or equal to 0.5mm, and the embodiment is selected to be 0.5 mm; the straightness of the large-chamfer copper plate is controlled to be less than or equal to 0.5mm, and the straightness is selected to be 0.5mm in the embodiment; the large chamfering copper plate needs to ensure that the shrinkage of the back taper meets the design requirement, and the large sealing ring cannot be used to cause the copper plate to retreat in use to influence the back taper to be reduced due to the large gap between the narrow back plate and the water tank. The flatness of the narrow-side back plate is controlled to be less than or equal to 0.3mm, and the flatness is selected to be 0.3mm in the embodiment; the flatness of the narrow-face copper plate, the large chamfer copper plate and the narrow-face back plate of the crystallizer is limited, so that the accuracy of detecting the back taper can be guaranteed.
The gap between the narrow back plate and the holding plate is less than or equal to 0.5mm, and the selected gap is 0.5mm in the embodiment. The gap is defined in order to avoid affecting the back taper stability of the narrow-faced copper plate.
The relative position of the wide-surface foot roller and the lower opening of the wide-surface copper plate is configured to be 0.30-0.50 +/-0.05 mm per side of the inward protrusion of the wide-surface foot roller, and the embodiment selects 0.5mm per side. The wide-surface copper plate can be protected and prevented from being worn by limiting the relative position of the wide-surface foot roller and the lower opening of the wide-surface copper plate.
When the crystallizer is assembled, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is controlled to be less than or equal to 0.15mm, and the size is selected to be 0.15mm in the embodiment. The size of the angle seam between the wide-surface copper plate and the narrow-surface copper plate of the crystallizer in a compression state is controlled, so that the contact part of the wide-surface copper plate and the narrow-surface copper plate is not extruded and deformed even under an unsteady state, for example, the angle seam is not more than 0.30mm when a water gap and a tundish are changed. The size of the corner seam is controlled, so that the phenomenon of steel clamping at the corner or the phenomenon of steel leakage caused by corner longitudinal cracks due to casting blank fracture can be avoided when a ladle is replaced.
The method further comprises limiting the clamping force of a disc spring for clamping the wide-surface copper plate, wherein the clamping force of the disc spring is larger than the combined force of the bulging force and the friction force between the inner arc water tank and the seat plate. Therefore, the back taper of the wide-surface copper plate can be ensured, the wide-surface copper plate is prevented from bulging, the phenomenon that an angle seam between the wide-surface copper plate and the narrow-surface copper plate exceeds the standard is avoided, the reasonable stress is that a disc spring is debugged to enable the pretightening force to reach 30% of the total compression amount, when the compression length of the wide-surface copper plate is clamped and then the wide-surface copper plate is slightly opened, the compression length is preferably compressed by 4mm, and when the compression length is 9MPa, the compression length is continuously compressed by 2 mm.
When the casting of the hypo-peritectic steel and the pulling speed of the peritectic steel are 1.00-1.80 m/min, the back taper of the narrow-face copper plate is 1.10-1.25%/m, and for a large-chamfer crystallizer, the back taper is increased by 0.20%/m. The selected thickness is 1.15%/m, the back taper of the wide-face copper plate is 0.75-0.95%/m, and the selected thickness is 0.85%/m. In other embodiments, the back taper of the wide-faced copper plate and the narrow-faced copper plate may be adaptively adjusted.
The difference value of the vertical distance between the upper opening and the lower opening of the wide-surface copper plate is at least 0.5mm, the embodiment is 0.5mm, and the inner arc and the outer arc of the wide-surface copper plate are basically distributed in a balanced manner, so that the condition of positive taper is avoided.
The relative position of the narrow-face foot roller and the narrow-face copper plate is configured that the narrow-face foot roller contracts inwards by at least 0.5mm per side, and the embodiment is selected to be 0.5mm per side.
When the tundish is replaced for pouring, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate at the position 400mm away from the upper opening of the crystallizer is less than or equal to 0.3mm, and the angle seam is selected to be 0.3mm in the embodiment. Specifically, if the size of a corner seam between the wide-surface copper plate and the narrow-surface copper plate at a position 400mm away from the upper opening of the crystallizer exceeds 0.3mm, casting is not required to be carried out, and the size of the corner seam at the position when the copper plate is newly cast does not exceed 0.5 mm.
The height difference of the platforms of the two vibration units of the crystallizer is controlled to be less than or equal to 0.5 mm. If the thickness exceeds 1.0mm, the thickness must be adjusted. In this example, the height difference was 0.5 mm. The narrow surface of the cast continuous casting billet has no bulging, and the corner has no longitudinal crack defect.
Example two
When a steel mill pours a 230mm multiplied by 1530mm continuous casting slab, the method of the invention is adopted, when the crystallizer is assembled, the straightness of the narrow-face copper plate is 0.3mm, the straightness of the narrow-face back plate is 0.3mm, and the gap between the narrow-face back plate and the holding plate is 0.4 mm.
The relative position of the wide-surface foot roller and the lower opening of the wide-surface copper plate is configured to be that the wide-surface foot roller protrudes inwards by 0.5mm per side. When the crystallizer is assembled, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is 0.15 mm. When the crystallizer is used, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is 0.3 mm.
The clamping force of the disk spring is greater than the resultant force of the bulging force and the friction force between the inner arc water tank and the seat plate.
When the hypo-peritectic steel is poured and the pulling speed of the peritectic steel is 1.00-1.65 m/min, the back taper of the narrow-face copper plate is 1.105%/m, and the back taper of the wide-face copper plate is 0.92%/m.
The vertical distance difference between the upper opening and the lower opening of the wide-surface copper plate is 0.5-1.0 mm.
The relative position of the narrow-face foot roller and the narrow-face copper plate is configured to enable the narrow-face foot roller to contract inwards by 0.5mm per side.
When the tundish is replaced for pouring, the size of a corner seam between the wide-surface copper plate and the narrow-surface copper plate at the position 400mm away from the upper opening of the crystallizer is 0.2 mm.
The height difference of the platforms of the two vibration units of the crystallizer is 0.5 mm. The narrow surface of the cast continuous casting billet has no overproof bulging, and the corner has no longitudinal crack defect.
EXAMPLE III
When a steel mill pours a continuous casting slab with the thickness of 300mm multiplied by 2250mm, the method of the invention is adopted, when the crystallizer is assembled, the straightness of the narrow-face large-chamfer copper plate is 0.5mm, the straightness of the narrow-face back plate is 0.3mm, and the gap between the narrow-face back plate and the holding plate is 0.5 mm.
The relative position of the wide-surface foot roller and the lower opening of the wide-surface copper plate is configured to be that the wide-surface foot roller protrudes inwards by 0.3mm per side. When the crystallizer is assembled, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is 0.15 mm; when the crystallizer is used, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is 0.2 mm.
The clamping force of the disk spring is greater than the resultant force of the bulging force and the friction force between the inner arc water tank and the seat plate.
When the pulling speed of the poured subcontracting steel and the peritectic steel is 0.80-0.93 m/min, the back taper of the narrow-face copper plate is 1.13%/m, and the back taper of the wide-face copper plate is 0.81%/m.
The vertical distance difference between the upper opening and the lower opening of the wide-surface copper plate is 0.6-1.3 mm.
The relative position of the narrow-face foot roller and the narrow-face copper plate is configured to enable the narrow-face foot roller to contract inwards by 0.9mm per side.
When the tundish is replaced for pouring, the size of a corner seam between the wide-surface copper plate and the narrow-surface copper plate at the position 400mm away from the upper opening of the crystallizer is 0.3 mm.
The height difference of the platforms of the two vibration units of the crystallizer is 0.5 mm. The narrow surface of the cast continuous casting billet is bulged within 3mm, and the corner part does not have the longitudinal crack defect.
In conclusion, in the method for preventing the longitudinal cracks of the continuous casting slab from leaking steel, which is provided by the embodiment of the invention, the online service life of the crystallizer copper plate is prolonged; the bulging amount of the narrow surface of the continuous casting billet is controlled, so that the generation of longitudinal cracks at the corner of a slab is avoided, the downtime of a casting machine due to the replacement of a crystallizer and the like is reduced, and the operation rate of the casting machine is improved; ensuring the smooth production of the steel rolling interface.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The method for preventing the longitudinal cracks of the continuous casting slab from leaking steel is characterized by comprising the following measures:
the flatness of the narrow-face copper plate, the large chamfer copper plate and the narrow-face back plate of the crystallizer is limited;
limiting the relative positions of the wide-surface foot roller and the wide-surface copper plate and the narrow-surface foot roller and the narrow-surface copper plate;
limiting the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate of the crystallizer;
limiting the back taper of the wide-surface copper plate and the narrow-surface copper plate of the crystallizer;
the precision of the oscillating unit of the crystalliser is defined.
2. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: the straightness control of leptoprosopy copper is at less than or equal to 0.5mm, the straightness control of the straight part of big chamfer copper is at less than or equal to 0.5mm, the straightness control of leptoprosopy backplate is at less than or equal to 0.3mm, the leptoprosopy backplate with hold the gap less than or equal to 0.5mm between the board.
3. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: the relative position of the wide-face foot roller and the lower opening of the wide-face copper plate is configured to be that the wide-face foot roller protrudes inwards by 0.30-0.50 +/-0.05 mm per side.
4. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: when the crystallizer is assembled, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is controlled to be less than or equal to 0.15 mm; when the crystallizer is used, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate is controlled to be less than or equal to 0.3 mm.
5. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: the device also comprises a clamping force limiting device used for limiting a disc spring for clamping the wide-surface copper plate, wherein the clamping force of the disc spring is larger than the combined force of the bulging force and the friction force between the inner arc water tank and the seat plate.
6. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: when the hypo-peritectic steel is poured and the pulling speed of the peritectic steel is 1.00-1.80 m/min, the back taper of the narrow-face copper plate is 1.10-1.25%/m, and the back taper of the wide-face copper plate is 0.75-0.95%/m.
7. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: the vertical distance difference between the upper opening and the lower opening of the wide-surface copper plate is at least 0.5 mm.
8. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: the relative position of the narrow-face foot roller and the narrow-face copper plate is configured that the narrow-face foot roller contracts inwards by at least 0.5mm per side.
9. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: when the tundish is replaced for pouring, the size of an angle seam between the wide-surface copper plate and the narrow-surface copper plate at the position 400mm away from the upper opening of the crystallizer is less than or equal to 0.3 mm.
10. The method for preventing the longitudinal crack bleed-out of the continuous casting slab as claimed in claim 1, wherein: the height difference of the platforms of the two vibration units of the crystallizer is controlled to be less than or equal to 0.5 mm.
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| CN115121776A (en) * | 2022-06-14 | 2022-09-30 | 武汉钢铁有限公司 | Method for judging breakout of continuous casting longitudinal crack |
| CN115069999A (en) * | 2022-06-30 | 2022-09-20 | 天津钢铁集团有限公司 | Method for judging precision of continuous casting machine through foot roll printing and casting of narrow surface of casting blank |
| CN115069999B (en) * | 2022-06-30 | 2023-07-21 | 天津钢铁集团有限公司 | Method for judging precision of continuous casting machine through casting blank narrow-face foot roll mark casting |
| CN115338378A (en) * | 2022-08-04 | 2022-11-15 | 中冶赛迪工程技术股份有限公司 | Narrow-edge foot roller mechanism of crystallizer and opening control method thereof |
| CN115338378B (en) * | 2022-08-04 | 2024-01-23 | 中冶赛迪工程技术股份有限公司 | Crystallizer narrow-edge foot roller mechanism and opening control method thereof |
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