CN102371283A - Method for improving ultra-fast cooling uniformity of medium and heavy plate after rolling - Google Patents
Method for improving ultra-fast cooling uniformity of medium and heavy plate after rolling Download PDFInfo
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- CN102371283A CN102371283A CN2011103121964A CN201110312196A CN102371283A CN 102371283 A CN102371283 A CN 102371283A CN 2011103121964 A CN2011103121964 A CN 2011103121964A CN 201110312196 A CN201110312196 A CN 201110312196A CN 102371283 A CN102371283 A CN 102371283A
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Abstract
The invention relates to a method for improving the ultra-fast cooling uniformity of a medium and heavy plate after rolling, the position of a jet flow header can be reasonably adjusted, and the method is characterized in that, 1) the position of an upper header is set as follows: an ultra-fast cooling upper header framework is adjusted up and down in the vertical direction, and the conditions of the formula: Hu*tg(theta)=Hd*tg(theta)+D are met; 2) the setting of a soft water seal of a washing water region on the upper surface of a steel plate meets the conditions of the formula: 1/2*the sum of flow rates of all forward headers in the region<water amount of the soft water seal<2*the sum of the flow rates of all the forward headers in the region; 3) the flow rate of a lower header is increased to compensate the heat exchange capacity of the lower surface, and the optimal ratio of water supply to water discharge is set to be between 1: 1.1 and 1: 2.5; 4) the measure of clearing residual cooling water on the upper surface is taken, side spraying devices are arranged on the two sides of an ultra-fast cooling roller table, a middle spraying device is arranged on the upper header framework and strong blowing devices are arranged at the two ends of the ultra-fast cooling device; and 5) the head and tail shading control of the speed of the roller table is performed as follows: an ultra-fast cooling control system is used for transformation control of the speed of the roller table of a steel plate head and a tail part low-temperature region according to a speed curve. By adopting the method, the cooling uniformity of a steel plate of the medium and heavy plate after rolling under ultra-fast cooling condition can be realized.
Description
Technical field
The present invention relates to the process for cooling of steel rolling, specifically is the improvement method that a kind of cut deal rolls the supper-fast cooling uniformity in back.
Background technology
In recent years, the control cooling technology had received the many attention of People more and more after cut deal rolled.Meanwhile, along with chilling temperature develops to low-temperature space, cooldown rate improves, because residual stress and plate shape problem that inhomogeneous cooling brings are particularly outstanding.We can say that the plate shape control under the high cooldown rate situation has become the bottleneck problem of utilizing the TMCP technology to carry out the high-strength steel exploitation.If do not adopt effective cooling uniformity to improve measure, roll under the supper-fast cooling condition in back at cut deal, spare problem with producing serious inhomogeneous cooling, even cause comparatively serious plate shape problem.Reason is that under supper-fast cooling condition cut deal is with the speed of service operation of 0.5～2.0m/s, and cooling water sprays heat exchange along the direction of steel plate operation to surface of steel plate with the speed of about 6～20m/s by certain angle.With this understanding, the lower collector pipe cooling water is stopped by roller-way, and under the effect of gravity, flows into the gutter.Meanwhile, the upper header cooling water can not in time be cleared out of the steel plate upper surface, and it will form comparatively strong heat exchange with surface of steel plate so that very fast speed is mobile to the steel plate traffic direction rapidly along the steel plate upper surface.At this moment, the steel plate lower surface that leaves ultrafast cool region with air cooling and with the heat conduction heat exchange of roller-way be main, and the steel plate upper surface is under the secondary heat exchange state of high speed flush water and residual water, causes steel plate upper and lower surfaces heat exchange inequality.In addition, often there are low-temperature zone in the head and the afterbody that roll the back steel plate, and traditional laminar flow type of cooling adopts changes in flow rate or collector to open and close and realizes the steel plate special control of low-temperature zone end to end, reduces cooling water to steel plate sub-cooled end to end.And for supper-fast cooling system, way of supplying water adopts pump directly to supply water usually, will cause greater impact to the stability of water system as adopting changes in flow rate or collector to open and close, and influences the stability of cooling system.
Summary of the invention
The purpose of this invention is to provide a kind of method that cut deal rolls the supper-fast cooling uniformity in back that is used to improve; Through reasonable adjustment jet collector position; Set up " soft water envelope "; Optimize water ratio up and down, utilize side spray, middle spray and blow device to remove surperficial residual water and the control of optimization roller table speed, realize that cut deal rolls the steel plate cooling uniformity under the supper-fast cooling condition in back.
The present invention is used to improve the method that cut deal rolls the supper-fast cooling uniformity in back; Ultrafast cooling device adopts the jet impulse heat exchange; It is characterized in that one is that the upper header position is provided with: it is static relatively that ultrafast cold upper header framework is designed to horizontal direction, and vertical direction is through mechanical leading screw and the upper and lower adjustment of hydraulic system; The upper frame desired location calculates by this formula: D be upper header with lower collector pipe roll on the center line edge of vertical direction to distance, H
dBe the distance of lower collector pipe jet exit apart from the roller-way upper surface, H
uBe the distance of upper header jet exit apart from the roller-way upper surface, θ is the angle of jet impulse and vertical direction, and above-mentioned parameter satisfies the condition shown in this formula: H
u* tg (θ)=H
d* tg (θ)+D.
The 2nd, the setting principle of steel plate upper surface flush water zone " soft water envelope ": the measure of (1) " soft water envelope " be in supper-fast cooling zone with collector along level and forward collector towards opposed; (2) principle is confirmed in " soft water envelope " zone of action: 1～3 group of forward collector+1 group " soft water envelope "; (3) " soft water envelope " flow is confirmed principle: the flow of " soft water envelope " carries out individual setting according to concrete process for cooling, satisfies this formula condition: all forward collector flow sums in all forward collector flow sums in 1/2 * one's respective area＜" soft water envelope " water yield＜2 * one's respective area;
The 3rd, increase the lower collector pipe flow lower surface exchange capability of heat compensated, the setting of water ratio and collector flow, roller table speed and steel plate thickness are closely related up and down, optimum about the water ratio be set within 1: 1.1～1: 2.5 the scope;
The 4th, the removal measure of the remaining cooling water of upper surface: (1) side-spraying device amounts to 4 covers; Every covering device is made up of 3 nozzles; Wherein 2 cover side-spraying devices are symmetrically arranged on the dash backplate of ultrafast cold inlet roller-way both sides, and 2 cover side-spraying devices are symmetrically arranged on the dash backplate of ultrafast cold outlet roller-way both sides in addition; Side-spraying device is realized the staggered of side water spray through the adjustment nozzle angle, makes the side water spray impact remaining cooling water in offside 2/3rds steel plate surface area along the steel plate width direction, and portion clears out of the steel plate upper surface from offside steel plate limit with remaining cooling water; (2) spray apparatus amounts to 4 covers in, and every covering device is made up of 2 nozzles.Spray apparatus is with on the upper frame of 3～4 groups of collectors in interval along the rolling centerline interlaced arrangement in Ultrafast cooling device in per 2 covers; The middle water spray outlet height distance roller-way about 300～500mm in surface; The middle water spray broad ways of spray apparatus ejection is impacted the remaining cooling water of 1/2nd steel plate upper surfaces at a certain angle in every cover, and it is cleared out of the steel plate upper surface; Side water spray and middle water spray pressure are that 1.2MPa, flow velocity are about 40m/s; (3) powerful blow device is 2 groups and is arranged in respectively outside ultrafast device for cooling inlet and the outlet of ultrafast device for cooling; Be across on the roller-way perpendicular to rolling direction; Vertical range apart from roller-way is 800mm～1200mm, and every group of powerful blow device is made up of a plurality of small nozzles, and compressed air blows to the remaining cooling water of steel plate upper surface with edge, certain inclination angle; The removing effect of powerful blow device is covered in whole surface of steel plate, can play the effect of thorough removing for the small portion of residual cooling water;
The 5th, roller table speed cover control end to end: ultrafast cold control system adopts the speed of service of rate curve control steel plate in the cooling zone that is designed; Steel plate head and afterbody low-temperature space are carried out the conversion control of roller table speed; Improve steel plate head and get into the cooling zone; Afterbody leaves the roller-way speed of service of cooling zone to reduce steel plate degree of supercooling end to end, when the plate body passes through the cooling zone, adopts the little acceleration of roller-way to eliminate the bulk temperature gradient of steel plate length direction simultaneously.
Got into since 21 century, supper-fast cooling technology was furtherd investigate after roller author will have the cut deal of material impact to roll with performance to the final tissue of product both at home and abroad.Northeastern University's rolling technique and tandem rolling automation National Key Laboratory under the guidance of TMCP technological thought of new generation, unremitting research and the exploration of carrying out Ultrafast cooling device and technology.2010, Northeastern University's rolling technique and tandem rolling automation National Key Laboratory develop intensity of cooling height, advanced supper-fast cooling system that cooling uniformity is good (Advanced Cooling System, ADCOS-PM).Its basic principle is to adopt the high-pressure spray impingement heat transfer, realizes raising and each improvement to cooling uniformity of steel plate of the instantaneous intensity of cooling of steel plate.Pass through adjustment Ultrafast cooling device upper header position rationally among the present invention; Set up " soft water envelope "; Optimize water ratio up and down; Adopt facilities such as side spray, middle spray, purging to remove surperficial residual water and ultrafast cold control system adopts the little acceleration control of roller-way, eliminate the bulk temperature gradient of length direction, realized that cut deal rolls steel plate under the supper-fast cooling condition in back respectively to cooling uniformity.
Reasonable Arrangement " soft water envelope " quantity and position can also be avoided steel plate upper surface cooling water formation " tank " in the ultrafast cool region effectively, and residual water is thicker in " tank ", and it will hinder the percussion of upper header water jets to the steel plate upper surface.Simultaneously, the cooling water in " tank " will soak the steel plate upper surface, and with surface of steel plate generation film boiling and transition boiling, it is even to produce inhomogeneous cooling.And " soft water envelope " technology is divided into the thin zone of several water layers with " tank ", and the impact water that flows out from collector like this can effectively be broken it, forms the high and good impingement heat transfer of cooling uniformity of intensity of cooling with surface of steel plate.
Description of drawings
Fig. 1 a is that zero point is adjusted sketch map in the upper frame position;
Fig. 1 b is to be that the steel plate of h carries out upper frame set positions sketch map to the thickness specification;
Fig. 2 is the water spray collector sketch map that adopts " soft water envelope " method to be provided with;
Fig. 3 is a upper and lower surfaces heat exchange regional correlation sketch map;
Fig. 4 is remaining cooling water cleaning measure sketch map;
Fig. 5 rolls back cooling metal sheets roller table speed control tendency chart;
Fig. 6 is the roller table speed curve synoptic diagram of steel plate after rolling;
Fig. 7 steel plate length direction temperature distributing curve diagram.
The specific embodiment
The present invention is used to improve the method that cut deal rolls the supper-fast cooling uniformity in back; Ultrafast cooling device adopts the jet impulse heat exchange; It is characterized in that 1. upper header Position Control: it is static relatively that ultrafast cold upper header framework is designed to horizontal direction, and vertical direction can carry out upper and lower adjustment through mechanical leading screw and hydraulic system.The computational methods and the set-up procedure of upper frame zeroing and set positions are following:
(1) fixedly upper header center line and lower collector pipe center line along the distance B of rolling direction;
(2) the fixing nozzle tip distance H surperficial down apart from roller-way
d
(3) lower collector pipe is impacted the steel plate lower surface with the inclination angle of θ, then lower collector pipe jet impulse point apart from lower collector pipe center line edge roll to distance H
d* tg (θ) is shown in Fig. 1 a.
(4) same upper header impacts the steel plate upper surface with the inclination angle of θ, then upper header jet impulse point apart from upper header center line edge roll to distance H
u* tg (θ);
(5) for guaranteeing the impingement heat transfer zone symmetry of steel plate upper and lower surfaces, then must satisfy H
u* tg (θ)=H
d* tg (θ)+D;
(6) when the steel plate that to thickness is h cooled off, the upper header height H was set at: H=H
d+ h is shown in Fig. 1 b.
2. steel plate upper surface flush water Region control
As shown in Figure 2; For solving the serious inhomogeneous cooling problem of cooling zone outlet steel plate upper and lower surfaces; The present invention is cut apart supper-fast cooling zone with " soft water envelope " technology; Make swiftly flowing cooling water be fixed within certain zone, avoid steel plate to leave of the secondary cooling effect of ultrafast cold outlet back cooling water the steel plate upper surface.
The setting principle of " soft water envelope " technology is following:
(1) " soft water envelope " promptly is provided with reverse collector in supper-fast cooling zone, arranges collector towards on the contrary along level and forward collector;
(2) principle is confirmed in " soft water envelope " zone of action: 1～3 group of forward collector+1 group " soft water envelope ";
(3) " soft water envelope " flow is confirmed principle: the flow of " soft water envelope " collector carries out individual setting according to concrete process for cooling, generally is set at all forward collector flow sums in all forward collector flow sums in 1/2 * one's respective area＜" soft water envelope " water yield＜2 * one's respective area.
As shown in Figure 2; Under the acting in conjunction of forward collector and " soft water envelope " reverse collector; Heat exchange in the cooling zone between steel plate upper surface and the cooling water is divided into following zone, and A district and E district are forward collector and " soft water envelope " reverse formed cooled region of collector; The B district is for the jet impulse heat exchange and wash away the heat exchange zone; The C district is jet impulse heat exchange, flush water heat exchange and " little tank " coefficient heat exchange zone; The D district is " soft water envelope " reverse collector residual water heat exchange afterwards zone; The F district is the air cooling zone behind the ultrafast device for cooling.
3. water ratio control up and down
When steel plate passes through the cooling zone; The steel plate upper surface experiences the cooled region that is formed jointly by forward collector and " soft water envelope " repeatedly; Be jet impulse heat exchange zone A and by flush water zone of action B and impingement heat transfer, wash away the mixed heat transfer zone C that heat exchange and residual water cause, as shown in Figure 3.The steel plate lower surface then experiences regional G of heat conduction heat exchange and the regional H of air cooling heat exchange that jet impulse heat exchange region D, flush water heat exchange area E, residual water heat exchange zone F, roller-way contacts with steel plate repeatedly.The heat exchange mode that the steel plate upper and lower surfaces is experienced is not quite similar, and under equal conditions the heat exchange of steel plate upper surface is far longer than the heat exchange of steel plate lower surface.
For realizing the symmetrical heat exchange of steel plate upper and lower surfaces, need to increase the lower collector pipe flow so that the lower surface exchange capability of heat is compensated.And technological procedure parameter such as the ratio that goes up the lower collector pipe flow and collector water jets flow, the roller-way speed of service and steel plate thickness, width equidimension specification are closely related, and reasonably lower collector pipe compares within the scope that is controlled at 1: 1.1～1: 2.5 usually with the upper header water yield.
4. the removal measure of the remaining cooling water of upper surface
The enforcement of above-mentioned measure has ensured the steel plate cooling uniformity inner in the cooling zone; But still have and cooling water flow out of on a small quantity beyond the cooling zone; Remaining cooling water carries out unordered flowing at surface of steel plate, with surface of steel plate unsettled heat exchange takes place, and causes the surface of steel plate inhomogeneous cooling even.The present invention adopts side spray, middle spray and the powerful compound mode that purges to remove remaining cooling water.As shown in Figure 4, B and E are side-spraying device among the figure.Side-spraying device amounts to 4 covers, and every covering device is made up of 3 nozzles.Wherein 2 cover entrance side spray apparatus B are symmetrically arranged on the dash backplate of ultrafast cold inlet roller-way both sides, and 2 cover outlet side spray apparatus E are symmetrically arranged on the dash backplate of ultrafast cold outlet roller-way both sides in addition.Side-spraying device B and E realize the staggered of side water spray through the adjustment nozzle angle, make the side water spray impact remaining cooling water in offside 2/3rds steel plate surface area along the steel plate width direction, and portion clears out of the steel plate upper surface from offside steel plate limit with remaining cooling water; Side water spray pressure is that 1.2MPa, flow velocity are about 40m/s.
As shown in Figure 4, C and D are middle spray apparatus among the figure.Middle spray apparatus amounts to 4 covers, and every covering device is made up of 2 nozzles.In 2 covers in spray apparatus C and 2 covers on the upper frame of spray apparatus D along the rolling centerline interlaced arrangement in Ultrafast cooling device; Spray apparatus is middle with 3～4 groups of collectors at interval in two covers; The middle water spray outlet height distance roller-way about 300～500mm in surface; The middle water spray broad ways of spray apparatus ejection is impacted the remaining cooling water of 1/2nd steel plate upper surfaces at a certain angle in every cover, and it is cleared out of the steel plate upper surface; Middle water spray pressure is that 1.2MPa, flow velocity are about 40m/s.A and F are powerful blow device among Fig. 4.Powerful blow device is 2 groups and is arranged in the ultrafast device for cooling inlet and the ultrafast device for cooling outlet outside respectively; Be across on the roller-way perpendicular to rolling direction; Vertical range apart from roller-way is 800mm～1200mm, and every group of powerful blow device is made up of a plurality of small nozzles, and compressed air blows to the remaining cooling water of steel plate upper surface with edge, certain inclination angle; The removing effect of powerful blow device is covered in whole surface of steel plate, can play the effect of thorough removing for the small portion of residual cooling water.
5. the adjustment roller table speed covers control end to end
The present invention with control more flexibly roller table speed as control object; Ultrafast cold control system to steel plate end to end the roller-way of low-temperature region implement to quicken control; When getting into the cooling zone, steel plate plate body has " the head height tail is low " Temperature Distribution along its length and be directed against; Adopt the little acceleration control of roller-way to help eliminating the bulk temperature gradient of length direction, prevent cold back temperature control result's fluctuation.
Shown in Figure 5 for steel plate designs at the whole roller table speed curve that rolls in the cooling procedure of back, steel plate after rolling, throws steel and cooling procedure speed experiences following several zone.The velocity variations trend of steel process is thrown for rolling the back by the A district; From finishing mill, run to the throwing steel speed of 2～5m/s at rolled steel plate and to roll the back runout table; Be reduced to the process for cooling roller-way speed of service in the runout table upper steel plate speed of service by throwing steel speed, be about 0.5～2m/s.B dodges the zone for steel plate head super cooled sect speed in the district, in B district light plate head enters into the supper-fast cooled region of opening collector.At this moment, suitably improve 1.3～1.7 times of the roller-way speed of service that the steel plate speed of service sets to normal process for cooling and keeping the time (look steel plate degree of supercooling can adjust) end to end about 3～5s.After this, the steel plate speed of service is reduced to conventional operation speed 0.5～2.0m/s, and continues little speed Control in plate body cooling procedure ,+0.02～-0.02m/s2, to eliminate steel plate thermograde longitudinally, shown in C district among Fig. 5; When the steel plate afterbody leaves when opening collector regional; Similar with the rate control process of steel plate head; 1.3～1.7 times and the time that keeps 3～5s of the roller-way speed of service 0.5～2.0m/s that normal process for cooling is set; Increase roller table speed to reduce the degree of supercooling of steel plate afterbody, shown in D district among Fig. 5.After the steel plate afterbody left ultrafast cool region, steel plate was transported to the aligning zone with fast speed, shown in E district among Fig. 5.
Embodiment
The heat (batch) number of producing with domestic certain steel mill is that 0313400000 pipe line steel is an example, and its concrete specification is 17.2mm * 3403mm * 39750mm, and the target process parameter of cooling procedure is as shown in table 1.
Table 1
According to the process for cooling requirement, the control model should be set at H with the upper header frame height
0+ h=348.5+17.5=366mm, its corresponding cooling rules are set as shown in table 2 simultaneously.In order to realize steel plate longitudinal temperature uniformity, steel plate speed of service setting value is as shown in Figure 6.
Table 2
Above-mentioned cooling rules are carried out by basic automatization control system, and the actual glacing flatness of steel plate is much smaller than the target call of 8mm/m.As shown in Figure 7, length direction 95% above temperature is controlled in distance objective and returns within the temperature range of red temperature ± 25 ℃.
Claims (6)
1. one kind is used to improve the method that cut deal rolls the supper-fast cooling uniformity in back; Ultrafast cooling device adopts the jet impulse heat exchange; It is characterized in that one is that the upper header position is provided with: ultrafast cold upper header framework horizontal direction is static relatively; The upper and lower adjustment of vertical direction, the upper frame desired location calculates by this formula: H
u* tg (θ)=H
d* tg (θ)+D;
The 2nd, the setting principle of steel plate upper surface flush water zone " soft water envelope ": the measure of (1) " soft water envelope " be in supper-fast cooling zone with collector along level and forward collector towards layout on the contrary; (2) principle is confirmed in " soft water envelope " zone of action: 1～3 group of forward collector+1 group " soft water envelope "; (3) " soft water envelope " flow is confirmed principle: the flow of " soft water envelope " carries out individual setting according to concrete process for cooling, satisfies this formula condition: all forward collector flow sums in all forward collector flow sums in 1/2 * one's respective area＜" soft water envelope " water yield＜2 * one's respective area;
The 3rd, increase the lower collector pipe flow lower surface exchange capability of heat compensated, the setting of water ratio and collector flow, roller table speed and steel plate thickness are closely related up and down, optimum about the water ratio be set within 1: 1.1～1: 2.5 the scope;
The 4th, the removal measure of the remaining cooling water of upper surface: (1) per two groups of side-spraying devices are symmetrically arranged in respectively on the dash backplate of ultrafast cold entrance and exit roller-way both sides, and every group of side-spraying device broad ways impacted the remaining cooling water of upper surface in opposite directions from steel plate opposite side portion; (2) in per two groups spray apparatus at interval 3～4 groups of collectors be arranged on the upper frame of Ultrafast cooling device along rolling centerline; The middle water spray outlet height distance roller-way about 300～500mm in surface, broad ways mind-set dual-side portion from steel plate impacts steel plate upper surface remnants cooling water; (3) 2 groups of powerful blow devices are arranged in the ultrafast device for cooling inlet and the ultrafast device for cooling outlet outside in opposite directions respectively; Be across on the roller-way perpendicular to rolling direction; Vertical range apart from roller-way is 800mm～1200mm, can play the effect of thorough removing for the small portion of residual cooling water;
The 5th, roller table speed cover control end to end: ultrafast cold control system adopts the speed of service of rate curve control steel plate in the cooling zone that is designed; Steel plate head and afterbody low-temperature space are carried out the conversion control of roller table speed; Improve steel plate head and get into the cooling zone; Afterbody leaves the roller-way speed of service of cooling zone to reduce steel plate degree of supercooling end to end, when the plate body passes through the cooling zone, adopts the little acceleration of roller-way to eliminate the bulk temperature gradient of steel plate length direction simultaneously.
2. according to claim 1ly be used to improve the method that cut deal rolls the supper-fast cooling uniformity in back, it is characterized in that the upper frame desired location to set D in the formula be upper header with lower collector pipe roll on the center line edge of vertical direction to distance, H
dBe the distance of lower collector pipe jet exit apart from the roller-way upper surface, H
uBe the distance of upper header jet exit apart from the roller-way upper surface, θ is the angle of jet impulse and vertical direction.
3. according to claim 1ly be used to improve the method that cut deal rolls the supper-fast cooling uniformity in back; It is characterized in that side-spraying device amounts to 4 covers; Every covering device is made up of 3 nozzles; Wherein 2 cover entrance side spray apparatus B are symmetrically arranged on the dash backplate of ultrafast cold inlet roller-way both sides, and 2 cover outlet side spray apparatus E are symmetrically arranged on the dash backplate of ultrafast cold outlet roller-way both sides in addition; Side-spraying device B and E realize the staggered of side water spray through the adjustment nozzle angle, make the side water spray impact remaining cooling water in offside 2/3rds steel plate surface area along the steel plate width direction, and portion clears out of the steel plate upper surface from offside steel plate limit with remaining cooling water; Side water spray pressure is that 1.2MPa, flow velocity are about 40m/s.
4. according to claim 1 being used to improved the method that cut deal rolls the supper-fast cooling uniformity in back, and spray apparatus amounts to 4 covers in it is characterized in that, spray apparatus is made up of 2 side nozzles in every cover; In 2 covers in spray apparatus C and 2 covers on the upper frame of spray apparatus D along the rolling centerline interlaced arrangement in Ultrafast cooling device; Spray apparatus is middle with 3～4 groups of collectors at interval in two covers; Middle spray apparatus passes through the adjustment nozzle angle, under the effect of 1.2MPa pressure, and the about 40m/s of middle water spray flow velocity.
5. according to claim 1ly be used to improve the method that cut deal rolls the supper-fast cooling uniformity in back; It is characterized in that every group of powerful blow device be made up of a plurality of small nozzles; Compressed air is inner to the cooling zone along the steel plate upper surface blown with inclination angle in opposite directions, and the removing effect of powerful blow device is covered in whole surface of steel plate.
6. according to claim 1ly be used to improve the method that cut deal rolls the supper-fast cooling uniformity in back; It is characterized in that steel plate head enters in the supper-fast cooled region of opening collector; Suitably improve 1.3～1.7 times and the time that keeps 3～5s of the steel plate speed of service to the roller-way speed of service 0.5～2.0m/s of normal process for cooling setting, look steel plate end to end degree of supercooling adjust; After this, the steel plate speed of service is reduced to conventional operation speed 0.5～2.0m/s, and continues little speed Control in plate body cooling procedure ,+0.02～-0.02m/s
2, to eliminate steel plate thermograde longitudinally; When the steel plate afterbody leaves when opening collector regional; Similar with the rate control process of steel plate head; 1.3～1.7 times and the time that keeps 3～5s of the roller-way speed of service 0.5～2.0m/s that normal process for cooling is set, increase roller table speed to reduce the degree of supercooling of steel plate afterbody.
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