CN103911544B - Low cost thick specification low-alloy structure and production method thereof - Google Patents
Low cost thick specification low-alloy structure and production method thereof Download PDFInfo
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Abstract
The invention discloses a kind of low cost thick specification low-alloy structure, wherein the weight percent of each component is: C:0.17 ~ 0.20%, Si:0.15 ~ 0.30%, Mn:0.35 ~ 0.55%, P≤0.025%, S≤0.01%, N≤0.008%, all the other are Fe and inevitable impurity.The production method of this structure iron is as follows: 1) continuous casting becomes base; 2) strand soaking; 3) high pressure descaling, finish rolling, 98%≤F1+F2 draft sum≤105%, F1 and F2 cooling water inflow is the normal water yield 70% ~ 80%, illusory F3 or F4, temperature out 840 ~ 870 DEG C; 4) section cooling speed 40 ~ 83 DEG C/sec, coiling temperature 540 ~ 570 DEG C, head coiling temperature 580 ~ 600 DEG C; 5) cool.Basically eliminate mixed crystal of the present invention and cold bend cracking phenomenon, scroll are good, are suitable for being widely used in field of steel production.
Description
Technical field
The present invention relates to technical field of steel production, refer to a kind of low cost thick specification low-alloy structure and production method thereof particularly.
Background technology
The CSP of present domestic large iron and steel enterprise is produced and is adopted CSP (CompactStripProduction more, compact output strip line) production line, this production line generally comprises two 150 tons of converters, two LF (LadleRefiningFurnace, ladle refining furnace) refining furnaces, RH refining furnace, double-current sheet blank continuous casting line, tunnel heating and seven frame hot continuous mills.It is 1680mm that casting machine produces maximum strand width, and thickness is 70mm, 90mm two kinds, and this casting machine has band liquid center cast rolling function, the thick strand of 70mm can casting to the thick strand of 52mm, 90mm can casting to 70mm, scooter 5 ~ 6m/min is drawn in the design effort of casting machine.The year design production capacity of the CSP production line hot rolled strip of latest domestic is 2,500,000 t, wherein, hot rolling acid-cleaning galvanization roll is supplied to be 54.2 ten thousand t, silicon steel stock roll 97.8 ten thousand t, hot rolling direct-furnish volume 980,000 t, the steel grade of production comprises: structural carbon steel, quality carbon steel, Hi-Stren steel, weatherproof structure steel, automobile structural steel, pipe line steel, ultra low-carbon steel, non orientating silicon steel, low-carbon cold rolling base-material steel etc.Compare with domestic and international similar sheet billet continuous casting and rolling production line, domestic CSP production line reaching product level, reach in product speed and quality control and achieve new breakthrough.
At present, Q235B steel grade is main force's product of domestic CSP production line, and along with the development in strip market, low alloy steel Q345B also presents good sales momentum on strip market.But the Mn content of current Q345B steel grade reaches 1.2 ~ 1.35%, and cost of alloy is still higher, be to this product competitive power commercially or the benefit of production line is all had a strong impact on.Owing to obviously can reduce cost of alloy and organization of production difficulty on variety development, flexible rolling technology starts to be promoted in each large steel enterprise.For the production status of low alloy steel Q345B, more domestic large iron and steel enterprise start the composition considered by optimizing Q235B, and be equipped with structure refinement and the strengthening that low temperature cooling controlling and rolling controlling process realizes steel, make Q235B steel grade production line flexible rolling go out low alloy steel Q345B, this is significant to reduction strip cost of alloy, raising product competitiveness.At present, Q235B production line is successfully produced the Thin Specs Q345B of below 3.0mm, and Mn content is also reduced to about 0.5% by original 1.2 ~ 1.35%.
But also there are the following problems in the production of low cost (Mn is reduced to about the 0.5%) thick specification low-alloy structure of more than 4.0mm specification:
1) unstable properties, conforming product rate is only 85%, due to the effect mainly solution strengthening effect of Mn in steel, reduces so solution strengthening effect after Mn falls in low cost low alloy steel.Simultaneously, because CSP produces line feature, the compression of heavy gauge steel strip is smaller, the fragmentation of strand original columnar grain is thorough not, finished product crystal grain is comparatively thick and not of uniform size, structure property controls unstable, and performance inconsistency is even generation, see the grain structure structure iron of Q345B comparative example in the parameters such as the yield strength value of Q345B comparative example in table 1, tensile strength values, yield tensile ratio and unit elongation and Fig. 1.
2) mixed crystal phenomenon and cold bend cracking problem, come out of the stove and low temperature rolling because adopting low temperature, F3 (FinishMill, the English free translation of finish rolling, this place F3 refers to the 3rd hot rolls, and F4 refers to all the people present's hot rolls) or the lower temperature of F4 passage and draft, cause the generation of finished strip mixed crystal phenomenon, the control of impact tissue, and finally affect the cold roll forming performance of client.Part low cost low alloy steel produces cold bend cracking phenomenon, and specification is thicker, and cold bend cracking probability is more obvious, affects image product and the customer trust degree of CSP production line, see the grain structure structure iron of Q345B comparative example in Fig. 1.
3) scroll problem, main finger tower and head bleeding edge problem, reason has two: 1. because low temperature finish to gauge and low temperature batch, and the comparatively large easily generation of speed of cooling is uneven, and head Strip Shape Control is poor, thus easily produces head turriform; 2. strip steel head out-of-shape, simultaneous temperature is lower, the detection of influence zone steel head tracking signal, affects the action of head side guide plate and the action of pinch roll, thus produces head turriform and head bleeding edge; Problems easily causes steel coil handling damage to cut damage, and serious entire volume is sentenced useless, affects the lumber recovery of product, not only increase cost of labor, and have influence on logistics delivery and contract is cashed, be unfavorable for the raising of product competitiveness, see the scroll schematic diagram of Q345B comparative example in Fig. 2.
Because of the problems referred to above, the tackling key problem progress of the think gauge low cost structural low alloy steel of more than 4.0mm is not obvious, and Mn content is also only reduced to 0.8%, coordinates processing parameter to produce in batches.
Summary of the invention
Object of the present invention be exactly to provide that a kind of stable performance, product strength and quality product are high, lumber recovery is high, low cost thick specification low-alloy structure that basically eliminate mixed crystal and cold bend cracking phenomenon, scroll are good and production method thereof.
For achieving the above object, low cost thick specification low-alloy structure designed by the present invention, it is characterized in that: in described structure iron, the weight percent of each component is: C:0.17 ~ 0.20%, Si:0.15 ~ 0.30%, Mn:0.35 ~ 0.55%, P≤0.025%, S≤0.01%, N≤0.008%, all the other are Fe and inevitable impurity.
Preferably, in described structure iron, the weight percent of each component is: C:0.18 ~ 0.19%, Si:0.17 ~ 0.21%, Mn:0.39 ~ 0.50%, P:0.016 ~ 0.023%, S:0.0062 ~ 0.0095%, N:0.0051 ~ 0.0072%, all the other are Fe and inevitable impurity.
Again further, in described structure iron, the weight percent of each component is: C:0.18%, Si:0.19%, Mn:0.45%, P:0.020%, S:0.0080%, N:0.0060%, and all the other are Fe and inevitable impurity.
For achieving the above object, the production method of the low cost thick specification low-alloy structure designed by the present invention, comprises the following steps: 1) smelting, external refining and continuous casting become base; 2) soaking is carried out to strand, strand tapping temperature is controlled at 1080 ~ 1130 DEG C; 3) slab carries out finish rolling after coming out of the stove after high pressure descaling, finished product thickness is controlled at 4 ~ 8mm, 98%≤F1+F2 (FinishMill, the English free translation of finish rolling, this place F1 refers to First hot rolls, F2 refers to second hot rolls) draft sum≤105%, meanwhile, the roll rolipass design water yield of F1 and F2 is 600 ~ 630m
370% ~ 80%, the illusory F3 as the 4mm≤finished product thickness < 5mm of/hour normal water yield, illusory F4 frame when finished product thickness is 5 ~ 8mm, exit temperature at finishing is 840 ~ 870 DEG C; 4) carry out laminar flow after finish rolling, section cooling adopts leading portion Cooling Mode in conjunction with the head ladder type of cooling, and speed of cooling controls at 40 ~ 83 DEG C/sec, batch after laminar flow, oiler temperature control is at 540 ~ 570 DEG C, and wherein, strip steel head 5 ~ 10m coiling temperature is 580 ~ 600 DEG C; 5) low cost thick specification low-alloy structure can be obtained after cooling.
Preferably, described step 2) in, strand tapping temperature controls at 1100 ~ 1120 DEG C; Described step 3) in, draft sum≤104% of 99%≤F1+F2, the roll rolipass design water yield of F1 and F2 is 610 ~ 620m
372% ~ 78% of/hour normal water yield, exit temperature at finishing is 850 ~ 860 DEG C; Described step 4) in, speed of cooling controls at 43.8 ~ 64.8 DEG C/sec, and oiler temperature control is at 550 ~ 565 DEG C, and wherein, strip steel head 6 ~ 8m coiling temperature is 585 ~ 594 DEG C.
Further, described step 2) in, strand tapping temperature controls at 1110 DEG C; Described step 3) in, the draft sum of F1+F2 is the roll rolipass design water yield of 102%, F1 and F2 is 615m
375% of/hour normal the water yield, exit temperature at finishing is 855 DEG C; Described step 4) in, speed of cooling controls at 56.7 DEG C/sec, and oiler temperature control is at 560 DEG C, and wherein, strip steel head 7m coiling temperature is 590 DEG C.
Again further, described step 1) in, thickness of strand is 70mm.
Principle of work of the present invention is such:
1) stable performance, conforming product rate is high: by increasing the draught of front passage, produces complete high temperature austenite recrystallize, is conducive to broken original strand column crystal, fining austenite grains size.Illusory by F3 or F4 frame, when overall compression ratio is constant, increase single pass draught, add the draft of non-recrystallization zone, make austenite crystal flattening, by the accumulation of defect concentration in the distortion of crystal grain accumulation fining austenite grains and austenite, ferrite crystal grain after refinement phase transformation, ensure that the realization of low cost thick specification low-alloy structure performance.
2) mixed crystal and cold bend cracking phenomenon is eliminated: F1 and F2 cooling water of working roll suitably reduces, avoid rolled piece surface, distorted area temperature drop obvious, F3 or F4 frame is illusory simultaneously, avoids the mixed crystal phenomenon caused in the rolling of partial, re-crystallization district and occurs, essentially eliminate cold bend cracking phenomenon.
Scroll improves: section cooling adopts head ladder process for cooling, head 5 ~ 10m batches with comparatively high temps, avoid causing because head cooling rate is excessive thermal stresses excessive and then have influence on plate form control and strip tracking signal detection, the detection of strip steel head tracking signal is ensured, so that the timely action of plate rolling side guide and pinch roll ensures that scroll is qualified while ensureing head scroll.
In sum, the invention has the advantages that: the Properties Control instability, the tissue that the invention solves the existence of CSP production line thick specification low-alloy structure exist the bad problem of the scroll such as mixed crystal or cold bend cracking, winding unit tower, bleeding edge, be conducive to crystal grain thinning, improve the stability of product performance, obtain grain-size comparatively refinement at CSP production line, performance index stablize good thick specification low-alloy structure, properties percent of pass reaches more than 99.8%, essentially eliminate the mixed crystal phenomenon of thick specification low-alloy structure, improve cold roll forming performance.Meanwhile, the winding unit tower caused because of technological problems and bleeding edge problem have also been obtained solution, and Mn content is also reduced to about 0.5%, reduce further cost of alloy, and product per ton reduces cost of alloy more than 20 yuan.
Accompanying drawing explanation
Fig. 1 is the grain structure structure iron of the think gauge structural alloy steel comparative example that prior art is produced;
Fig. 2 is the scroll structural representation of the think gauge structural alloy steel that prior art is produced;
Fig. 3 is the grain structure structure iron of embodiment 4 in low cost thick specification low-alloy structure of the present invention;
Fig. 4 is the coiling process schematic diagram of embodiment 4 in low cost thick specification low-alloy structure of the present invention;
Fig. 5 is the scroll structural representation of low cost thick specification low-alloy structure of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the present invention is described in further detail, and the parameter comparison of the comparative example of each embodiment and prior art refers to and is attached to table 1 below:
In Fig. 1 to Fig. 2, under prior art condition, think gauge structural alloy steel is existing in the introduction describes, and does not repeat them here.
Embodiment 1:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.17%, Si:0.21%, Mn:0.35%, P:0.02%, S:0.0062%, N:0.0053%, all the other are Fe and inevitable impurity, and thickness is 4.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) soaking is carried out to strand, strand tapping temperature is controlled at 1130 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and the roll cooling water water yield of finished product thickness to be the draft sum of 6mm, F1+F2 be 105%, F1 and F2 is 480m
3/ hour, illusory F4 frame, exit temperature at finishing is 870 DEG C;
4) carry out laminar flow after finish rolling, section cooling be leading portion Cooling Mode in conjunction with the head ladder type of cooling, speed of cooling reaches 82.76 DEG C/sec, and coiling temperature is at 570 DEG C.Strip steel head 10m coiling temperature is 600 DEG C.
Embodiment 2:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.19%, Si:0.17%, Mn:0.45%, P:0.018%, S:0.008%, N:0.006%, all the other are Fe and inevitable impurity, and thickness is 7.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) carry out soaking to strand, controlling strand tapping temperature is 1100 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and the roll cooling water water yield of finished product thickness to be the draft sum of 4mm, F1+F2 be 102%, F1 and F2 is 488m
3/ hour, illusory F3 frame, exit temperature at finishing is 850 DEG C;
4) carry out laminar flow after finish rolling, section cooling adopts leading portion Cooling Mode in conjunction with the head ladder type of cooling, and speed of cooling reaches 56.7 DEG C/sec, and coiling temperature is at 560 DEG C.Strip steel head 10m coiling temperature is 600 DEG C.
Embodiment 3:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.20%, Si:0.15%, Mn:0.5%, P:0.023%, S:0.01%, N:0.0051%, all the other are Fe and inevitable impurity, and thickness is 6.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) soaking is carried out to strand, strand tapping temperature is controlled at 1120 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and the roll cooling water water yield of finished product thickness to be the draft sum of 4mm, F1+F2 be 104%, F1 and F2 is 434m
3/ hour, illusory F3 frame, exit temperature at finishing is 850 DEG C;
4) carry out laminar flow after finish rolling, section cooling adopts leading portion Cooling Mode in conjunction with the head ladder type of cooling, and speed of cooling reaches 61.2 DEG C/sec, and coiling temperature is at 560 DEG C.Strip steel head 5m coiling temperature is 600 DEG C.
Embodiment 4:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.18%, Si:0.3%, Mn:0.42%, P:0.025%, S:0.007%, N:0.0072%, all the other are Fe and inevitable impurity, and thickness is 8.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) soaking is carried out to strand, strand tapping temperature is controlled at 1100 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and the roll cooling water water yield of finished product thickness to be the draft sum of 4mm, F1+F2 be 99%, F1 and F2 is 441m
3/ hour, illusory F3 frame, exit temperature at finishing is 840 DEG C;
4) laminar flow is carried out after finish rolling, section cooling adopts leading portion Cooling Mode in conjunction with the head ladder type of cooling, and speed of cooling reaches 43.8 DEG C/sec, coiling temperature (CoilTemperature, namely the CT in Fig. 4) at 540 DEG C, strip steel head 5m coiling temperature is 590 DEG C.
See Fig. 3, the grain structure structure iron of embodiment 4 as can be seen from low cost thick specification low-alloy structure of the present invention, crystal grain is thin and evenly, eliminate mixed crystal phenomenon, have clear improvement relative to the grain structure figure of Fig. 1.
See Fig. 4, the coiling process figure of embodiment 4 as can be seen from low cost thick specification low-alloy structure of the present invention, the coiling temperature of strip steel head is higher than the coiling temperature being with other parts of steel, head batches with comparatively high temps, can avoid causing because head cooling rate is excessive thermal stresses excessive and then have influence on plate form control and strip tracking signal detection, while ensureing head scroll, ensure the detection of strip steel head tracking signal, the timely action being convenient to plate rolling side guide and pinch roll ensures that scroll is qualified.
See Fig. 5, the grain structure structure iron of embodiment 4 as can be seen from low cost thick specification low-alloy structure of the present invention, solve the winding unit tower and bleeding edge problem that cause because of technological problems in Fig. 2, scroll is improved.
Embodiment 5:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.18%, Si:0.21%, Mn:0.39%, P:0.016%, S:0.0095%, N:0.0058%, all the other are Fe and inevitable impurity, and thickness is 5.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) carry out soaking to strand, controlling strand tapping temperature is 1120 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and the roll cooling water water yield of finished product thickness to be the draft sum of 8mm, F1+F2 be 105%, F1 and F2 is 462m
3/ hour, illusory F4 frame, exit temperature at finishing is 860 DEG C;
4) carry out laminar flow after finish rolling, section cooling adopts leading portion Cooling Mode in conjunction with the head ladder type of cooling, and speed of cooling reaches 64.8 DEG C/sec, and coiling temperature is at 560 DEG C, and strip steel head 10m coiling temperature is 590 DEG C.
The mechanical property of table 1 embodiment and comparative example contrasts
Claims (6)
1. the production method of a low cost thick specification low-alloy structure, in described structure iron, the weight percent of each component is: C:0.17 ~ 0.20%, Si:0.15 ~ 0.30%, Mn:0.35 ~ 0.55%, P≤0.025%, S≤0.01%, N≤0.008%, all the other are Fe and inevitable impurity, said method comprising the steps of:
1) smelting, external refining and continuous casting become base;
2) soaking is carried out to strand, strand tapping temperature is controlled at 1080 ~ 1130 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, is controlled by finished product thickness at 4 ~ 8mm, draft sum≤105% of 98%≤F1+F2, and meanwhile, the roll rolipass design water yield of F1 and F2 is 600 ~ 630m
370% ~ 80%, the illusory F3 as the 4mm≤finished product thickness < 5mm of/hour normal water yield, illusory F4 frame when finished product thickness is 5 ~ 8mm, exit temperature at finishing is 840 ~ 870 DEG C;
4) carry out laminar flow after finish rolling, section cooling adopts leading portion Cooling Mode in conjunction with the head ladder type of cooling, and speed of cooling controls at 40 ~ 83 DEG C/sec, batch after laminar flow, oiler temperature control is at 540 ~ 570 DEG C, and wherein, strip steel head 5 ~ 10m coiling temperature is 580 ~ 600 DEG C;
5) low cost thick specification low-alloy structure can be obtained after cooling.
2. the production method of low cost thick specification low-alloy structure according to claim 1, it is characterized in that: in described structure iron, the weight percent of each component is: C:0.18 ~ 0.19%, Si:0.17 ~ 0.21%, Mn:0.39 ~ 0.50%, P:0.016 ~ 0.023%, S:0.0062 ~ 0.0095%, N:0.0051 ~ 0.0072%, all the other are Fe and inevitable impurity.
3. the production method of low cost thick specification low-alloy structure according to claim 2, it is characterized in that: in described structure iron, the weight percent of each component is: C:0.18%, Si:0.19%, Mn:0.45%, P:0.020%, S:0.0080%, N:0.0060%, all the other are Fe and inevitable impurity.
4. the production method of low cost thick specification low-alloy structure according to claim 1, is characterized in that: described step 2) in, strand tapping temperature controls at 1100 ~ 1120 DEG C; Described step 3) in, draft sum≤104% of 99%≤F1+F2, the roll rolipass design water yield of F1 and F2 is 610 ~ 620m
372% ~ 78% of/hour normal water yield, exit temperature at finishing is 850 ~ 860 DEG C; Described step 4) in, speed of cooling controls at 43.8 ~ 64.8 DEG C/sec, and oiler temperature control is at 550 ~ 565 DEG C, and wherein, strip steel head 6 ~ 8m coiling temperature is 585 ~ 594 DEG C.
5. the production method of low cost thick specification low-alloy structure according to claim 4, is characterized in that: described step 2) in, strand tapping temperature controls at 1110 DEG C; Described step 3) in, the draft sum of F1+F2 is the roll rolipass design water yield of 102%, F1 and F2 is 615m
375% of/hour normal the water yield, exit temperature at finishing is 855 DEG C; Described step 4) in, speed of cooling controls at 56.7 DEG C/sec, and oiler temperature control is at 560 DEG C, and wherein, strip steel head 7m coiling temperature is 590 DEG C.
6. the production method of low cost thick specification low-alloy structure according to any one of claim 1 to 5, is characterized in that: described step 1) in, thickness of strand is 70mm.
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| CN106119710A (en) * | 2016-07-15 | 2016-11-16 | 上海宝钢包装钢带有限公司 | Middle high-strength steel strip for packaging and preparation method thereof |
| CN106244921B (en) * | 2016-08-30 | 2018-05-01 | 武汉钢铁有限公司 | A kind of method in CSP producing lines using rolling in ferrite domains production mild steel |
| CN106834640A (en) * | 2017-03-07 | 2017-06-13 | 华北理工大学 | A kind of manufacture method of low-alloy structural steel hot rolled steel plate |
| CN111889513B (en) * | 2020-06-30 | 2022-07-08 | 武汉钢铁有限公司 | Thin slab continuous casting and rolling dummy rolling method and control system thereof |
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| CN102226250A (en) * | 2011-06-13 | 2011-10-26 | 马鞍山钢铁股份有限公司 | Hot rolled steel plate with yield strength being 700MPa and preparation method thereof |
| CN102242310A (en) * | 2011-08-05 | 2011-11-16 | 武汉钢铁(集团)公司 | Precoating steel plate for building structure and production method thereof |
| CN102345050A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Method for producing flaw detection and performance guaranteed Q235B steel plate with 80-100mm in argon station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102226250A (en) * | 2011-06-13 | 2011-10-26 | 马鞍山钢铁股份有限公司 | Hot rolled steel plate with yield strength being 700MPa and preparation method thereof |
| CN102345050A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Method for producing flaw detection and performance guaranteed Q235B steel plate with 80-100mm in argon station |
| CN102242310A (en) * | 2011-08-05 | 2011-11-16 | 武汉钢铁(集团)公司 | Precoating steel plate for building structure and production method thereof |
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