CN103071774B - Method for controlling surface temperature of casting blank at straightening point of continuous casting machine - Google Patents

Method for controlling surface temperature of casting blank at straightening point of continuous casting machine Download PDF

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CN103071774B
CN103071774B CN201310025769.4A CN201310025769A CN103071774B CN 103071774 B CN103071774 B CN 103071774B CN 201310025769 A CN201310025769 A CN 201310025769A CN 103071774 B CN103071774 B CN 103071774B
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cooling
temperature
strand
casting
pulling rate
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CN201310025769.4A
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CN103071774A (en
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刘青
刘孝山
张晓峰
王彬
汪宙
王刚
王宝
谢飞鸣
李红卫
卢新春
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北京科技大学
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Abstract

The invention relates to a method for controlling the surface temperature of a casting blank at a straightening point of a continuous casting machine, and belongs to the technical field of continuous casting billet quality control. The method is particularly suitable for continuous casting of crack sensitive steel when a long air-cooling area is formed in front of the straightening point of the continuous casting machine. In order to solve the problem that the traditional secondary cooling parameter water distributing method cannot sufficiently control the cooling process of the crack sensitive steel, the invention provides an improved secondary cooling parameter water distributing method. The method can ensure that the surface temperature of each cooling sections of the casting blank reaches the set target temperature in the cooling process at a casting speed and the surface temperature of the casting blank at the straightening point avoids a brittleness temperature range of the cast steel, and also can ensure that when the actual casting speed is deviated from the casting speed, the surface temperature of each cooling section of the casting blank is close to the set target temperature, the cooling rate of the casting blank in each cooling section is basically unchanged and the surface temperature of the casting blank at the straightening point stably avoids the brittleness temperature range of the cast steel. By the method, the probability of crack defects of the casting blank when the casting speed is unstable is reduced, so that the quality of the casting blank is improved.

Description

A kind of method of controlling conticaster aligning point place casting blank surface temperature
Technical field
The present invention relates to continuous casting billet quality control technology field, particularly a kind of method of controlling conticaster aligning point place casting blank surface temperature.This method, is specially adapted to be provided with compared with the strand of the crack sensitivity steel grade of vast sky cold-zone and produce before conticaster aligning point.Application this method, can ensure under the unsettled production of Casting speed, the surface temperature that strand is aligned some place by conticaster can stably be avoided " brittle temperature range " of watered steel grade, thereby reduces strand and occur in aligning process the probability of crackle, improves the quality of strand.
Background technology
The cooling control of continuous casting secondary is one of key technology of strand production process, and the cooling control of secondary not only affects the productivity ratio of conticaster, also slab quality is had to importantly impact.The reasonably cooling control of secondary, not only to ensure that strand is evenly cooling in the horizontal, cooldown rate in longitudinal (throwing direction) is reasonable, and also will ensure that strand is aligned at conticaster aligning point place time, the surface temperature of strand is avoided " brittle temperature range " of watered steel grade.Continuous casting for crack sensitivity steel grade is produced, in order to improve its slab quality, before conticaster aligning point, longer air cooling zone (with respect to common steel grade) is set, strand is carried out weak cold, this reduces by reducing slab cooling speed the internal stress producing in slab cooling process, thereby reduces strand crackle odds in cooling procedure.
In recent years, continuous casting technology constantly becomes more meticulous and supermatic future development towards control, and continuous casting secondary Cooling Control Technology also needs constantly to carry out Improvement and perfection, to adapt to the high-quality requirement of product.Continuous casting billet secondary cooling control method forefathers are had to a lot of research, they have also applied for a lot of patents about continuous casting billet cooling procedure quality control aspect, for example, patent CN1911561 has mainly studied and has applied the solidification shrinkage amount that light soft reduction process effectively compensates strand and improve slab quality; Patent CN101347822 mainly detects online by casting blank solidification process temperature field, and Real-time Feedback is adjusted the two cold each section of water yields, and controlling strand has a rational temperature field to obtain high-quality strand; Patent CN101474666 is mainly determined by experiment the different continuous casting and solidifying behaviors of different steel grade solidified shells and the quantitative relationship of two cold inductile regional temperature scopes, be used for revising two cold water distribution metallurgical criteria and determine rational target surface temperature curve, make casting blank solidification process have a rational temperature field, and then ensure slab quality.
Current, the most frequently used continuous casting two cold control method of steel mill is shape as Q i=A iv 2+ B iv+C i+ D ithe parameter decreasing water distribution method of Δ T.When the method is applied to continuous casting production, first, set the control target temperature at each cooling section end that produces steel grade; Secondly, use heat transfer model to calculate the corresponding relation of the two cold each section of water yields and pulling rate and molten steel overheat; Finally, use mathematical regression analysis to obtain the water distribution control parameter A of each cooling section i, B i, C i, D i.When the method is applied to continuous casting production control, each section of the Secondary Cooling Zone of Continuous Caster water yield, using the casting blank surface temperature of two cold each section of outlets as controlling target, is done corresponding water amount adjustment according to Casting speed and molten steel casting variations in temperature.For shorter air cooling zone or all continuous casting production of water-cooled are set before conticaster aligning point, application parameter decreasing water distribution method, can ensure that strand reaches control target temperature in the surface temperature at each cooling section end of conticaster and aligning point place substantially.Fig. 1 is conticaster metallurgical structure sketch, for being provided with before conticaster aligning point and producing compared with the continuous casting of cold section of vast sky, under the work pulling rate condition of production, application parameter decreasing water distribution method, can ensure strand at conticaster each cooling section end and the surface temperature at aligning point place reaches control target temperature; Depart from Actual Casting Speed under the unstable production of work pulling rate, parameter water distribution method be but difficult to ensure strand in the surface temperature control at aligning point place in target setting temperature range, thereby be also difficult to ensure that strand stably avoids " brittle temperature range " of watered steel grade in the surface temperature at aligning point place, and air cooling zone before aligning point is longer, is more difficult to ensure the stability of strand in aligning point place temperature.This is because air cooling zone is longer, the heat ratio that strand accounts for whole two cold process transmission at the heat of air cooling zone transmission is larger, the fluctuation of pulling rate can cause the heat generation certain fluctuation of strand in air cooling zone transmission, thereby directly affects the control of strand in the temperature at conticaster aligning point place.Thereby, the slab quality of producing when the very difficult guarantee of parameter water distribution method Casting speed is unstable.
The two cold control procedures of producing spring steel 60Si2Mn taking certain steel mill below, as example, describe the weak point of above-mentioned parameter water distribution method.60Si2Mn steel is crack sensitivity steel grade, in strand is produced, two cold 1 section of conticaster, two cold 2 sections, two cold 3 sections, two cold 4 sections spray water coolingly, the 5th section before next-door neighbour's aligning point is air cooling section.Fig. 2 is the cooling procedure of application parameter water distribution method control 60Si2Mn steel, obtains under different casting strand at conticaster each cooling section end and a result for the surface temperature at aligning point place.As can be seen from Figure 2 in the time there is fluctuation in Casting speed, application parameter water distribution method can effectively be controlled two cold 1 section, two cold 2 sections, two cold 3 sections and two cold 4 sections of last casting blank surface temperatures and be stabilized in certain scope, and larger variation has occurred the casting blank surface temperature at conticaster aligning point place.Fig. 3 is that 60Si2Mn steel is tested the casting blank section shrinkage factor and the tensile strength variation with temperature curve that record by thermoplasticity.When Casting speed drops to 1.1m/min by the pulling rate 1.3m/min that works as shown in Figure 2, strand can drop to 950 DEG C of left and right by 985 DEG C in the surface temperature at conticaster aligning point place, and strand can drop sharply to 25% by 60% accordingly in the contraction percentage of area at conticaster aligning point place as shown in Figure 3.And in the time of 950 DEG C, strand is in its " brittle temperature range " scope, this temperature of strand is aligned, and can directly cause strand crack defect to increase, and slab quality declines.Can not ensure that strand avoids " brittle temperature range " of watered steel effectively in the surface temperature at conticaster aligning point place, the quality of strand is just difficult to be guaranteed, thereby necessary research and development are provided with the cooling means of producing compared with the continuous casting of cold section of vast sky before conticaster aligning point.
Summary of the invention
Technical problem to be solved by this invention is: owing to existing compared with vast sky cold-zone before conticaster aligning point, the deficiency existing when the continuous casting production crack sensitivity steel grade for conventional two cold parameter water distribution methods, has proposed a kind of cooling means of conticaster at aligning point place casting blank surface temperature of controlling.
Application the inventive method control strand two cold processes, can ensure at work pulling rate and depart under two kinds of conditions of production of work pulling rate, the cooldown rate of the each cooling section of strand in throwing direction is substantially constant, meanwhile, strand is stably avoided " brittle temperature range " of watered steel grade by the surface temperature at the aligning place of putting.The present invention is directed to the unsettled continuous casting of pulling rate produces, two new cooling control methods on the basis of traditional parameters decreasing water distribution method, are invented, two new cooling control methods to continuous casting two cold but the water yield of process carry out finely regulating, can effectively reduce the strand crack defect causing because Casting speed is unstable, and then improve slab quality.
The present invention solves its technical problem and adopts two new cooling control methods, and particular content is as follows:
In casting process, in the time that Actual Casting Speed departs from work pulling rate, pulling rate variation meeting exerts an influence in the heat transmission of each cooling section of conticaster to strand.In water-cooled section, by regulating injection flow rate to make strand reach the control target surface temperature of setting at each cooling section end; Air cooling section before aligning point, the heat that strand transmits by radiation is uncontrollable, thereby can not ensure that strand is controlled at target setting temperature range in the temperature at conticaster aligning point place.Invent herein for this problem, propose following methods and solve: the control water yield that Secondary Cooling Zone of Continuous Caster is each section is made up of two parts, and a part is the water yield Q under the normal process parameter (pulling rate, the degree of superheat) being obtained by two traditional cold parameter water distribution methods pi; Another part is the compensation water yield Q while departing from work pulling rate because of Actual Casting Speed ci, the model of concrete control method is as follows:
Q i=Q Pi+Q Ci
Wherein: Q pi=A iv 0 2+ B iv 0+ C i+ D iΔ T; Q ci=E i(V-V 0)
In formula:
Q ithe control water yield of-each cooling section, L/min;
Q pithe control water yield of each cooling section that-parameter decreasing water distribution method obtains, L/min;
Q cithe offset of each cooling section water yield when-Actual Casting Speed departs from work pulling rate, L/min;
A i, B i, C i, D ithe control parameter of each cooling section water yield under-ginseng water decreasing water distribution method, L/m;
E ithe control parameter of each cooling section compensation water yield when-Actual Casting Speed departs from work pulling rate, L/m;
V-strand Actual Casting Speed, m/min;
V 0the work pulling rate of-design, m/min;
The degree of superheat of Δ T molten steel, DEG C.
In two new cooling control methods, each control parameter A of parameter decreasing water distribution method i, B i, C iand D isolution procedure see Fig. 4, the core control thought of compensation method and compensation water yield parameter E isolution procedure as follows:
(1) aborning, when Actual Casting Speed is lower than work when pulling rate, parameter water distribution method is by regulating each section of the two cold-zones water yield can ensure that the surface temperature at the each cooling section of strand end reaches target setting temperature, and strand can be longer because of the air cooling section time of staying before aligning point, more heat has been transmitted in radiation, thereby cause strand aligns some place surface temperature by conticaster lower than the target temperature of setting under work pulling rate, and pulling rate reduction is more, surface temperature when strand arrives conticaster aligning point is lower, strand is more likely aligned at " brittle temperature range ", thereby, strand occurs that in aligning process the probability of crack defect is also larger, the quality of strand is also difficult to be guaranteed.
(2) aborning, when Actual Casting Speed is higher than work when pulling rate, parameter water distribution method is by regulating each section of the two cold-zones water yield can ensure that the surface temperature at the each cooling section of strand end reaches target setting temperature, and strand can be shorter because of the air cooling section time of staying before aligning point, the heat of radiation transmission is less, thereby, cause strand aligns some place surface temperature by conticaster higher than the target temperature of setting under work pulling rate, and pulling rate increase is more, strand is higher in the surface temperature at conticaster aligning point place, this situation can not cause strand to be aligned at " brittle temperature range ", thereby little to the quality influence of strand.
(3) depart from the situation of work pulling rate for Actual Casting Speed in producing, the surface temperature control of locating at conticaster aligning point in order to ensure strand is in target setting temperature range, solution of the present invention is as follows: the increase of the air cooling section heat dissipation capacity of the strand causing fluctuating because of pulling rate before aligning point or the value of minimizing, at the two each water cooling sections in cold-zone, it is carried out to feedforward compensation, concrete solution process is as follows.
(4) when Actual Casting Speed is lower than work when pulling rate, in the method that the present invention proposes, the reduction of the two cold each section of water yields calculates except comprising by parameter water allocation model the water yield reducing, and also will additionally increase the water yield of calculating by compensation model, and concrete offset is Q ci=E i(V-V 0), now, the water yield value of calculating is negative value, additionally reduces by the two cold each section of water yields, this can suitably improve the surface temperature of strand in two each cooling section exits, cold-zone, makes it a little more than the control target temperature of setting.Heat by reducing water-cooled transmission is to causing strand to carry out effective feedforward compensation in the recruitment of air cooling section radiations heat energy because pulling rate reduces institute, thereby ensures that the surface temperature that strand is located at aligning point reaches target setting temperature.
(5) when Actual Casting Speed is higher than work when pulling rate, in the method that the present invention proposes, the recruitment of the two cold each section of water yields calculates except comprising by parameter water allocation model the water yield increasing, and also will additionally increase the water yield of calculating by compensation model, and concrete offset is Q ci=E i(V-V 0), now, the water yield value of calculating be on the occasion of, additionally increase by the two cold each section of water yields, this can suitably reduce the surface temperature of strand in two each cooling section exits, cold-zone, make its a little less than set control target temperature.Cause strand to carry out effective feedforward compensation in the reduction of air cooling section radiations heat energy by the heat that increases water-cooled transmission to the institute that raises because of pulling rate, thereby ensure that the surface temperature that strand is located at aligning point reaches target setting temperature.
The compensation water yield of (6) two each section of cold-zones is followed the principle of successively decreasing gradually along each section of water yield of throwing direction, causes strand to distribute at the variable quantity of air cooling zone transmission heat to depart from work pulling rate because of Actual Casting Speed; In the time departing from work pulling rate, adjust the compensation water yield of each section of two cold-zones according to mentioned above principle, use casting blank solidification heat transfer model to calculate strand at conticaster each cooling section end and the surface temperature at aligning point place.For realizing the meticulous control to casting blank solidification cooling procedure, under different casting, the cooldown rate of two each cooling sections of cold-zone is followed substantially constant principle, the target temperature range that the casting blank surface temperature at aligning point place should be controlled at.Set up E iwith the relation of the each section of compensation water yield, applied regression analysis method solves the E of each cooling section ivalue.
The present invention, on the basis of parameter water distribution method, has invented a kind of method of controlling conticaster aligning point place strand temperature, and this method, is applicable to be provided with compared with the strand of the crack sensitivity steel grade of vast sky cold-zone and produce before conticaster aligning point.Two new cooling control methods can either ensure under work pulling rate, strand casting blank surface temperature of each cooling section in cooling procedure reaches target setting temperature, strand is avoided " brittle temperature range " of watered steel grade in the surface temperature at aligning point place, can ensure that again Actual Casting Speed departs under the production of work pulling rate, the casting blank surface temperature of each cooling section approaches target setting temperature, strand is substantially constant in the cooldown rate of each cooling section, and strand is stably avoided " brittle temperature range " of watered steel grade by the surface temperature at the aligning place of putting.This method can reduce the occurrence probability of strand crack defect under pulling rate unstable production effectively, and then improves slab quality.The present invention breaks through two conventional cold parameter water distribution methods, and has carried out on this basis new invention, and the key idea of technology is that the strand temperature in secondary cooling process of CC route is carried out to meticulous control, realizes the evenly controlled of slab cooling process.
Brief description of the drawings
Fig. 1 conticaster metallurgical structure sketch, wherein 1 is tundish; 2 is crystallizer; 3 is two cold-zones; 4 is the front air cooling zone of aligning point; 5 is aligning district; 6 is air cooling zone after aligning point; 7 is continuous casting billet; 8 is strand cutter sweep
Under the control of Fig. 2 parameter decreasing water distribution method, strand is on the surface at each cooling section end with the change curve of pulling rate, and its center line 0 represents two cold 1 section of last variations in temperature; Line 2 represents two cold 2 sections of last variations in temperature; Line 3 represents two cold 3 sections of last variations in temperature; Line 4 represents two cold 4 sections of last variations in temperature; Line 5 represents the variations in temperature of aligning point
Figure 36 0Si2Mn steel billet contraction percentage of area and tensile strength variation with temperature curve, line 1 represents contraction percentage of area variation with temperature, line 2 represents that tensile strength varies with temperature curve
The control parametric solution logic chart of the each cooling section of parameter water distribution method that Fig. 4 is traditional
Two cooling control methods that Fig. 5 the present invention sets up obtain strand in the surface temperature at each cooling section end the change curve with pulling rate, its center line 1 represents two cold 1 section of last variations in temperature; Line 2 represents two cold 2 sections of last variations in temperature; Line 3 represents two cold 3 sections of last variations in temperature; Line 4 represents two cold 4 sections of last variations in temperature; Line 5 represents the variations in temperature of aligning point
Detailed description of the invention
With concrete case study on implementation, the invention will be further described below.
The present invention explains in detail to utilization process of the present invention as an example of the continuous casting cooling procedure of certain 60Si2Mn of steel mill spring steel example.60Si2Mn spring steel belongs to crack sensitivity steel grade, before its conticaster aligning point, is provided with longer air cooling zone, in production, strand is carried out weak cold with minimizing strand crack defect, raising slab quality.The various parameters of casting machine are in table 1, in production strand in the control desired values of the surface temperature at two each cooling sections ends, cold-zone and aligning point place in table 2.As operation parameter water allocation model Q i=A iv 2+ B iv+C i+ D iwhen Δ T controls the water yield of each section of two cold-zones, by the step shown in Fig. 4, the control parameter of each cooling section is solved, solving result is in table 3, application parameter water distribution method determines that the two cold each section of water yields obtain under different casting, and strand is shown in Fig. 2 at the change curve of the surface temperature at two each cooling section ends, cold-zone and an aligning place.As shown in Figure 2, in the time that pulling rate fluctuates, parameter water distribution method can keep the casting blank surface temperature at two each cooling section ends, cold-zone to be controlled at target temperature range, and strand has a very large change in the surface temperature at conticaster aligning point place, as in the time that pulling rate drops to 1.1m/min by 1.3m/min, strand can drop to 950 DEG C by 985 DEG C in the surface temperature at conticaster aligning point place, visible, when parameter water distribution method can not well be controlled at Actual Casting Speed and departs from work pulling rate, strand is in the surface temperature at aligning point place.According to the 60Si2Mn steel billet contraction percentage of area variation with temperature curve shown in Fig. 3, can very clearly learn under unsettled production, strand easily occurs and in " brittle temperature range " of watered steel, aligned, this can directly cause strand crackle to increase, and slab quality declines.
Table 1 conticaster parameter
Casting machine radius (m) 9.0 Two cold 1 segment length (m) 0.4
Casting blank cross-section size (mm 2) 180·180 Two cold 2 segment length (m) 2.0
Crystallizer effective length (m) 0.8 Two cold 3 segment length (m) 2.6
Aligning point is apart from meniscus distance (m) 15.0 Two cold 4 segment length (m) 4.2
Work pulling rate (mmin -1 1.30 Air cooling length (m) before aligning point 5.0
The control temperature value at end, each section of table 2 two cold-zones and aligning point place
1 section of end (DEG C) 2 sections of ends (DEG C) 3 sections of ends (DEG C) 4 sections of ends (DEG C) Aligning point (DEG C)
985 1110 1095 1040 ≥980
The control parametric solution value of each cooling section in table 3 traditional parameters decreasing water distribution method model
The decreasing water distribution method control secondary cooling process of CC route that uses the present invention to propose, in the time that Actual Casting Speed departs from work pulling rate, new decreasing water distribution method carries out feedforward compensation to the water yield of the two each cooling sections in cold-zone, and offset is: Q ci=E i(V-V 0).Use the method for the present invention's description to E isolve, try to achieve the compensation water yield parameter E of the two each cooling sections in cold-zone ivalue, in table 4, uses neoteric method to control two of 60Si2Mn steel cold processes, obtains strand under various pulling rates and sees Fig. 5 at the change curve of the surface temperature at two each cooling section ends, cold-zone and an aligning place.When fluctuation occurs pulling rate as can be seen from Figure 5, can there is certain variation in the surface temperature at two each cooling section ends, cold-zone in strand, but strand remains unchanged substantially in the cooldown rate of each cooling section; Now, strand changes very little in the time that pulling rate fluctuates in the surface temperature at aligning point place, substantially can be stabilized in the control target temperature range of setting.Known two new cold decreasing water distribution methods can aligned some temperature by fine control continuous casting billet, like this under the unsettled production of pulling rate, still can ensure that strand stably avoids " brittle temperature range " of watered steel grade by the surface temperature at the aligning place of putting, thereby, this method can reduce the occurrence probability of strand crack defect under pulling rate unstable production effectively, and then improves slab quality.
The E of each cooling section compensating parameter in table 4 new method ithe value of solving, L/m
E 1 E 2 E 3 E 3
1.44 51.73 -37.96 0.14
60Si2Mn steel continuous casting for square billet section 180mm × 180mm in above-mentioned operating mode is produced, in the time that work pulling rate changes suddenly, and the decreasing water distribution method that uses the present invention to propose, each cooling section compensation water yield is in table 5.
The each cooling section compensation water of table 5 weight range

Claims (2)

1. control the method for conticaster aligning point place casting blank surface temperature for one kind, it is characterized in that: the strand for crack sensitivity steel grade is produced, depart from Actual Casting Speed under the unstable period of work pulling rate, avoid " brittle temperature range " of watered steel grade in the surface temperature at conticaster aligning point place in order to ensure strand, to causing the variation of strand in the transmission of conticaster air cooling zone heat because of pulling rate fluctuation, the water yield by each water-cooled section before adjustment air cooling is carried out feedforward compensation to process air cooler, the surface temperature control that guarantee strand is located at conticaster aligning point is in target setting temperature range, effectively avoiding strand is aligned at " brittle temperature range " of watered steel grade, and then the occurrence probability of minimizing strand crackle, improve the quality of strand, the present invention is characterized in that adopting following two cold decreasing water distribution methods:
Q i=Q Pi+Q Ci
Wherein: Q pi=A iv 0 2+ B iv 0+ C i+ D iΔ T; Q ci=E i(V-V 0)
In formula:
Q ithe control water yield of-each cooling section, L/min;
Q pithe control water yield of each cooling section that-parameter decreasing water distribution method obtains, L/min;
Q cithe offset of each cooling section water yield when-Actual Casting Speed departs from work pulling rate, L/min;
A i, B i, C i, D ithe control parameter of each cooling section water yield under-ginseng water decreasing water distribution method, L/m;
E ithe control parameter of each cooling section compensation water yield when-Actual Casting Speed departs from work pulling rate, L/m;
V-strand Actual Casting Speed, m/min;
V 0the work pulling rate of-design, m/min;
The degree of superheat of Δ T molten steel, DEG C.
2. according to a kind of method of controlling conticaster aligning point place casting blank surface temperature claimed in claim 1, for cooling water inflow control method in continuous casting and solidifying process, consider the corresponding water amount control method that causes strand to carry out in the variation of conticaster air cooling zone heat transmission because of pulling rate variation, in the time that Actual Casting Speed is worked pulling rate partially, align some precompensation water yield Q by increase cimode, with the heat mode of water-cooled transmission to change because of pulling rate caused strand to carry out effective feedforward compensation in the variation of air cooling section radiations heat energy, set up E iwith the relation of the each section of compensation water yield, applied regression analysis method solves the E of each cooling section ivalue, thus ensure that strand reaches target setting temperature in the surface temperature at aligning point place.
CN201310025769.4A 2013-01-24 2013-01-24 Method for controlling surface temperature of casting blank at straightening point of continuous casting machine CN103071774B (en)

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