EP2979770B1 - Dispositif et procédé de fabrication d'une tôle d'acier épaisse - Google Patents

Dispositif et procédé de fabrication d'une tôle d'acier épaisse Download PDF

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Publication number
EP2979770B1
EP2979770B1 EP14775597.9A EP14775597A EP2979770B1 EP 2979770 B1 EP2979770 B1 EP 2979770B1 EP 14775597 A EP14775597 A EP 14775597A EP 2979770 B1 EP2979770 B1 EP 2979770B1
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EP
European Patent Office
Prior art keywords
steel plate
cooling
cooling water
descaling
water
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EP14775597.9A
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German (de)
English (en)
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EP2979770A1 (fr
EP2979770A4 (fr
Inventor
Yuta TAMURA
Hiroyuki Fukuda
Kenji Adachi
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JFE Steel Corp
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JFE Steel Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0071—Levelling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table

Definitions

  • the present invention relates to a method and a facility for manufacturing a steel plate that performs hot rolling, shape correction and controlled cooling thereto.
  • Patent Literature 1 discloses a method in which descaling is performed at at least one of a location just in front of and a location just behind a finish rolling final path, then, hot shape correction is performed, then, descaling is performed, and forced cooling is performed.
  • Patent Literature 2 discloses a method in which, after performing finish rolling and hot shape correction, descaling is performed and, then, controlled cooling is performed.
  • Patent Literature 3 discloses a method in which, just before performing controlled cooling, descaling is performed while controlling collision pressure of cooling water.
  • Patent literature 4 discloses a facility in accordance with the preamble of claim 1, in which an accelerated cooling apparatus resembles that depicted in Fig. 2 .
  • the present invention has been carried out as a result of focusing on the unsolved problems of the aforementioned related arts. It is an object of the present invention to provide a facility and a method for manufacturing a steel plate which performs uniform cooling during the cooling step by uniformizing scale formed on a surface of the steel plate in the descaling step, to manufacture the steel plate having excellent shape.
  • the gist of the present invention is as follows.
  • the present invention it is possible to perform uniform cooling during the accelerated cooling step and to manufacture the steel plate having excellent shape, by uniformizing scale formed on the surface of the steel plate in the descaling step.
  • Fig. 1 is a schematic view of an exemplary steel plate rolling line used for carrying out the present invention.
  • a rolling apparatus 3 performs rough rolling and finish rolling on a slab taken away from a heating furnace 2, and the slab is rolled into a steel plate 1 having a predetermined plate thickness. Then, after scale formed on a surface of the steel plate 1 is removed by a descaling apparatus 4, the steel plate 1 is transported on-line to an accelerated cooling apparatus 6.
  • a first shape correcting apparatus 5 from the viewpoint of the shape of the steel plate after the cooling.
  • the steel plate is cooled up to a predetermined temperature by cooling water that is jetted from an upper surface cooling facility and a lower surface cooling facility. Then, if necessary, the shape of the steel plate is corrected by a second shape correcting apparatus 7.
  • the descaling apparatus 4 is a apparatus that removes scale formed on a surface of the steel plate 1.
  • a plurality of injection nozzles are caused to face the surface of the steel plate 1 whose distorted shape has been corrected by the first shape correcting apparatus 5, and cooling water is jetted from these nozzles.
  • scale formed on the surface of the steel plate 1 is removed by descaling with the energy density E of the cooling water being greater than or equal to 0.10 J/mm 2 . Then, the accelerated cooling apparatus 6 performs accelerated cooling on the steel plate 1.
  • the thickness of the scale becomes small and uniform by descaling, when the steel plate passes the accelerated cooling apparatus, it is possible to perform uniform cooling almost without any variations in surface temperature at locations on the steel plate in a width direction, and for the steel plate to have excellent shape.
  • the scale may be partly removed off.
  • the scale is not uniformly removed off, as a result of which variations in the distribution of thickness of the scale of approximately 10 to 50 ⁇ m occur.
  • the descaling apparatus 4 by performing descaling by the descaling apparatus 4 with the energy density E of the cooling water being greater than or equal to 0.10 J/mm 2 , the variations in the distribution of thickness of the scale are eliminated. Consequently, when the accelerated cooling apparatus 6 has cooled the steel plate 1, it is possible to perform uniform cooling almost without any variations in surface temperature at locations on the steel plate in the width direction. As a result, it is possible to manufacture the steel plate 1 having excellent shape. In the case of the present invention, even if the collision pressure is low, it is possible to, by adjusting transport velocity, perform descaling that is similar to descaling that is performed when the collision pressure is high.
  • E energy density E (J/mm 2 ) of cooling water that is jetted to the steel plate
  • E Q / d ⁇ W ⁇ ⁇ v 2 / 2 ⁇ t
  • Q descaling water jetting flow rate [m 3 /s]
  • d spray jet thickness [mm] of flat nozzle
  • W spray jet width [mm] of flat nozzle
  • ⁇ fluid density [kg/m 3 ]
  • v fluid velocity [m/s] during collision at steel plate
  • water flow amount density ⁇ jetting pressure ⁇ collision time may be used as a simple definition of the energy density E (J/mm 2 ) of cooling water that is jetted to the steel plate.
  • water flow rate (m 3 /(mm 2 ⁇ min)) is a value calculated by using the formula “jetting flow rate of cooling water ⁇ cooling water collision area”.
  • the collision time (s) is a value that is calculated by "cooling water collision thickness ⁇ transport velocity of steel plate”.
  • the energy density E of cooling water is preferably greater than or equal to 0.10 J/mm 2 and is more preferably greater than or equal to 0.15 J/mm 2 .
  • a jetting distance H preferably is less than or equal to 200 mm.
  • the jetting distance is reduced, for example, jetting flow rate and jetting pressure for obtaining a predetermined energy density can be reduced. Therefore, it is possible to reduce pumping power of the descaling apparatus 4.
  • the steel plate 1 of which shape has been corrected by the first shape correcting apparatus 5 moves into the descaling apparatus 4. Therefore, it is possible to bring the injection nozzles of the descaling apparatus 4 close to the surface of the steel plate 1.
  • the lower limit of the jetting distance is preferably greater than or equal to 40 mm. From the above, in the present invention, the jetting distance H is preferably from 40 mm to 200 mm.
  • the jetting pressure of cooling water is preferably greater than or equal to 10 MPa, and, more preferably, greater than or equal to 15 MPa. It is advantageous because this makes it possible to set the energy density of cooling water to a value that is greater than or equal to 0.10 J/m 2 without excessively reducing the transport velocity.
  • the upper limit of the jetting pressure is not particularly limited to a certain value. However, if the jetting pressure is increased, energy that is consumed by a pump that supplies high-pressure water becomes a tremendous amount. Therefore, the jetting pressure is preferably less than or equal to 50 MPa.
  • ⁇ 2 a ⁇ exp ⁇ Q / RT ⁇ t
  • ⁇ scale thickness
  • a constant
  • Q activation energy
  • R constant
  • T steel plate temperature [K] before cooling
  • t time.
  • a distance L from an exit side of the descaling apparatus 4 to an entrance side of the accelerated cooling apparatus 6 is set with respect to the transport velocity V of the steel plate 1 and the time t (time from the end of the step of the descaling apparatus 4 to the starting of the step of the accelerated cooling apparatus 6) so as to satisfy the following Formula (6): L ⁇ V ⁇ t where L: distance (m) from descaling apparatus 4 to accelerated cooling apparatus 6, V: transport velocity (m/s) of steel plate 1, t: time (s).
  • Formula (7) L ⁇ V ⁇ 5 ⁇ 10 ⁇ 9 ⁇ exp 25000 / T
  • Formula (9) it is preferable that Formula (9) be satisfied: L ⁇ V ⁇ 5.6 ⁇ 10 ⁇ 10 ⁇ exp 25000 / T
  • the cooling is stable when the distance L from the descaling apparatus 4 to the accelerated cooling apparatus 6 is from 12 m to 107 m, is more stable when the distance L is from 5 m to 47 m, and is very stable when the distance L is from 1.3 m to 12 m.
  • the transport velocity V of a large portion of the steel plate 1 that requires controlled cooling is greater than or equal to 0.5 m/s
  • the distance L be less than or equal to 2.5 m, which is a condition that allows the cooling to be very stable at this transport velocity V.
  • the case in which the temperature of the steel plate 1 before the cooling by the accelerated cooling apparatus 6 is 820°C is described.
  • the temperature of the steel plate 1 before the cooling by the accelerated cooling apparatus 6 is other than 820°C, it is possible for the cooling to be stable when the distance L from the descaling apparatus 4 to the accelerated cooling apparatus 6 is preferably less than or equal to 12 m, is more preferably less than or equal to 5 m, and is even more preferably less than or equal to 2.5 m.
  • the accelerated cooling apparatus 6 includes an upper header 11 that supplies cooling water to an upper surface of the steel plate 1, cooling water injection nozzles 13 that are suspended from the upper header 11 and that jet rod-like cooling water, and a partition wall 15 that is set between the steel plate 1 and the upper header 11. It is preferable that the partition wall 15 be provided with a plurality of water supply ports 16 into which lower ends of the cooling water injection nozzles 13 are inserted and a plurality of water drainage ports 17 for draining the cooling water supplied to the upper surface of the steel plate 1 to locations above the partition wall 15.
  • the upper surface cooling facility includes the upper header 11 that supplies cooling water to the upper surface of the steel plate 1, the cooling water injection nozzles 13 that are suspended from the upper header 11, and the partition wall 15 that is provided horizontally in the width direction of the steel plate between the upper header 11 and the steel plate 1 and that includes a plurality of through holes (the water supply ports 16 and the water drainage ports 17).
  • Each cooling water injection nozzle 13 is a circular tube nozzle 13 that jets the rod-like cooling water. An end of each nozzle 13 is inserted into its corresponding through hole (water supply port 16) in the partition wall 15, and is set above a lower end portion of the partition wall 15.
  • each cooling water injection nozzle 13 In order to prevent each cooling water injection nozzle 13 from sucking foreign material at a bottom portion of the interior of the upper header 11 and from becoming clogged, an upper end of each injection nozzle 13 preferably penetrates the upper header 11 so as to protrude into the interior of the upper header 11.
  • the term "rod-like cooling water " in the present invention refers to cooling water which is jetted while pressure of a certain amount is applied from circular nozzle jetting openings (which may also refer to elliptical or polygonal nozzle jetting openings); which has a cooling-water jetting speed from each nozzle jetting opening of 6 m/s or greater, preferably 8 m/s or greater; and whose flow is a continuous and linear flow in which the shape of a cross section of the flow of water jetted from each nozzle jetting opening is maintained in a substantially circular shape. That is, the rod-like cooling water differs from cooling water that freely falls downward from a circular tube laminar nozzle, and cooling water that is jetted in liquid drops like a spray.
  • each cooling water injection nozzle 13 is inserted into its corresponding through hole and is set above the lower end portion of the partition wall 15 to prevent, by the partition wall 15, the cooling water injection nozzles 13 from becoming damaged even when the steel plate whose end has been warped upward has moved in. This makes it possible to perform the cooling for a long period of time with the cooling water injection nozzles 13 being set in a good state. Therefore, it is possible to prevent temperature irregularities of the steel plate without, for example, repairing the facility.
  • each circular tube nozzle 13 Since the end of each circular tube nozzle 13 is inserted in its corresponding through hole, as shown in Fig. 11 , the end of each circular tube nozzle 13 does not interfere with the flow in a width direction of drainage water 19 that flows along an upper surface of the partition wall 15 and that is indicated by a dotted arrow. Therefore, it is possible for the cooling water jetted from the cooling water injection nozzles 13 to equally reach the upper surface of the steel plate regardless of the locations in the width direction, and uniformly cool the steel plate in the width direction.
  • the partition wall 15 is provided with a plurality of through holes having a diameter of 10 mm. These through holes are provided in a grid pattern at a pitch of 80 mm in the width direction of the steel plate and at a pitch of 80 mm in the conveyance direction.
  • the cooling water injection nozzles 13 each having an outside diameter of 8 mm, an inside diameter of 3 mm, and a length of 140 mm are inserted in the corresponding water supply ports 16.
  • the cooling water injection nozzles 13 are arranged in a staggered pattern form, and the through holes in which the cooling water injection nozzles 13 are not inserted are the water drainage ports 17 for the cooling water.
  • the plurality of through holes in the partition wall 15 of the accelerated cooling apparatus according to the present invention include substantially the same number of water supply ports 16 and water drainage ports 17, and are assigned different roles and functions.
  • the total cross sectional area of the drainage water outlets 17 is sufficiently larger than the total cross sectional area of the inside of the cooling water injection nozzles 13, which are the circular tube nozzles 13, and is approximately 11 times the total cross sectional area of the inside of the circular tube nozzles 13.
  • the cooling water supplied to the upper surface of the steel plate fills a portion between the surface of the steel plate and the partition wall 15, and is guided to locations above the partition wall 15 and quickly drained via the water drainage ports 17.
  • Fig. 7 is a front view for describing the flow of drainage cooling water above the partition wall near an end portion of the partition wall in a width direction of the steel plate.
  • each water drainage port 17 is an upward direction, which is opposite to the cooling water jetting direction.
  • the drainage cooling water that has flowed out of the partition wall 15 to locations above the partition wall 15 changes its direction towards an outer side in the width direction of the steel plate, flows through a drainage water flow path, provided between the upper header 11 and the partition wall 15, and is drained.
  • each water drainage port 17 is inclined in the width direction of the steel plate such that the water drainage direction is an oblique direction in a widthwise outer-side direction so as to be set towards the outer side in the width direction of the steel plate.
  • each water drainage port and its corresponding water supply port are set in the same through hole, it becomes difficult for the cooling water to flow out of the partition wall 15 to locations above the partition wall 15 after the cooling water has collided with the steel plate.
  • the cooling water flows through a portion between the steel plate 1 and the partition wall 15 towards an end portion in a width direction of the steel plate.
  • This causes the flow rate of the drainage cooling water between the steel plate 1 and the partition wall 15 to become large with decreasing distance to the end portion in the width direction of the plate. Therefore, with decreasing distance to the end portion in the width direction of the plate, this interferes with force for causing jetted cooling water 18 to reach the steel plate by penetrating through a retained water membrane.
  • a width thereof is 2 m at most, so that its influence is limited.
  • a steel plate has a plate width that is greater than or equal to 3 m, its influence cannot be ignored. Therefore, cooling of an end portion in a width direction of a steel plate becomes weak, in which case, the temperature distribution in the width direction of the steel plate becomes non-uniform.
  • the accelerated cooling apparatus is formed such that the water supply ports 16 and the water drainage ports 17 are separately formed and such that there is a division of roles into supplying water and draining water. Therefore, the cooling drainage water passes through the water drainage ports 17 in the partition wall 15 and smoothly flows to locations above the partition wall 15. Consequently, since the drainage water after the cooling is quickly removed from the upper surface of the steel plate, cooling water that is subsequently supplied can easily penetrate a retained water membrane, as a result of which sufficient cooling capability can be provided.
  • the temperature distribution in the width direction of the steel plate in this case becomes uniform, as a result of which a uniform temperature distribution can be obtained in the width direction.
  • the cooling water can be quickly drained.
  • This can be achieved by, for example, forming holes that are larger than the outside diameter of the circular tube nozzles 13 in the partition wall 15 and setting the number of water drainage ports so as to be equal to or greater than the number of water supply ports.
  • the total cross sectional area of the water drainage ports 17 is less than 1.5 times the total cross sectional area of the inside of the circular tube nozzles 13, the flow resistance at each water drainage port becomes high, and, thus, it becomes difficult for retained water to be drained. As a result, the amount of cooling water that can penetrate a retained water membrane and reach the surface of the steel plate is considerably reduced, as a result of which the cooling capability is reduced. Therefore, this is not preferable. It is more preferable for the total cross sectional area of the water drainage ports 17 to be greater than or equal to 4 times the total cross sectional area of the inside of the circular tube nozzles 13.
  • the ratio between the total cross sectional area of the water drainage ports and the total cross sectional area of the inside of the circular tube nozzles 13 be in the range of from 1.5 to 20.
  • a gap between an outer peripheral surface of each circular tube nozzle 13 inserted in its corresponding water supply port 16 in the partition wall 15 and an inner surface defining its corresponding water supply port 16 be less than or equal to 3 mm in size. If the gap is large, the influence of flow that accompanies the cooling water that is jetted from each circular tube nozzle 13 causes the drainage cooling water drained to an upper surface of the partition wall 15 to be introduced into the gap between each water supply port 16 and the outer peripheral surface of its corresponding circular tube nozzle 13, as a result of which the cooling water is supplied again to locations above the steel plate. Therefore, cooling efficiency is reduced.
  • each circular tube nozzle 13 be substantially the same as the size of its corresponding water supply port 16.
  • a gap of up to 3 mm at which the influence is essentially small is allowed. More desirably, the size is less than or equal to 2 mm.
  • each circular tube nozzle 13 the inside diameter of each circular tube nozzle 13, the length of each circular tube nozzle, the jetting velocity of the cooling water, and the nozzle distance also need to be optimal values.
  • the inside diameter of each nozzle is suitably from 3 to 8 mm. If the inside diameter is less than 3 mm, batches of water jetted from the nozzles become thin, as a result of which they lose force. In contrast, if the diameter of each nozzle exceeds 8 mm, the flow velocity is reduced, as a result of which force for causing the cooling water to penetrate the retained water membrane is reduced.
  • each circular tube nozzle 13 is suitably from 120 to 240 mm.
  • the phrase “the length of each circular tube nozzle 13" refers to a length from an inlet in the upper end of each nozzle that penetrates by a certain amount into the interior of the header to a lower end of each nozzle inserted in the corresponding water supply port in the partition wall.
  • each circular tube nozzle 13 If the length of each circular tube nozzle 13 is less than 120 mm, the distance between a lower surface of the header and the upper surface of the partition wall becomes too small (for example, if the thickness of the header is 20 mm, a protruding amount of the upper end of each nozzle into the interior of the header is 20 mm, and an insertion amount of the lower end of each nozzle in the partition wall is 10 mm, the distance becomes less than 70 mm). Therefore, water drainage space above the partition wall becomes small, as a result of which the drainage cooling water cannot be smoothly drained. In contrast, if the length of each circular tube nozzle 13 is greater than 240 mm, pressure loss in each circular tube nozzle 13 becomes large, as a result of which the force for causing the cooling water to penetrate the retained water membrane is reduced.
  • the jetting velocity of the cooling water from each nozzle is necessary for the jetting velocity of the cooling water from each nozzle to be greater than or equal to 6 m/s, and, preferably, greater than or equal to 8 m/s. This is because, if the jetting velocity is less than 6 m/s, the force for causing the cooling water to penetrate the retained water membrane becomes extremely weak. It is preferable that the jetting velocity be greater than or equal to 8 m/s because it is possible to achieve higher cooling capability. In addition, it is desirable that the distance from the lower end of each cooling water injection nozzle 13 for upper surface cooling to the surface of the steel plate 1 be from 30 to 120 mm.
  • the distance is less than 30 mm, the frequency with which the steel plate 1 collides with the partition wall 15 is extremely high, as a result of which it becomes difficult to maintain facilities. If the distance exceeds 120 mm, the force for causing the cooling water to penetrate the retained water membrane becomes extremely small.
  • draining rollers 20 may be set in front of and behind the upper header 11. This causes a cooling zone length to become constant, and facilitates temperature control.
  • the flow of cooling water in the conveyance direction of the steel plate is intercepted by the draining rollers 20.
  • the cooling water tends to be retained near the draining rollers 20.
  • the cooling water injection nozzles in a most upstream side row in the conveyance direction of the steel plate among the rows of the circular tube nozzles 13 that are arranged side by side in the width direction of the steel plate be tilted by 15 to 60 degrees upstream in the conveyance direction of the steel plate, and the cooling water injection nozzles in a most downstream side row in the conveyance direction of the steel plate among the rows of the circular tube nozzles 13 that are arranged side by side in the width direction of the steel plate be tilted by 15 to 60 degrees downstream in the conveyance direction of the steel plate.
  • This makes it possible to also supply the cooling water to locations close to the draining rollers 20, and increase cooling efficiency without the cooling water being retained near the draining rollers 20. Therefore, this is desirable.
  • the distance between the lower surface of the upper header 11 and the upper surface of the partition wall 15 is set such that the cross sectional area of a flow path in the width direction of the steel plate in a space surrounded by the lower surface of the header and the upper surface of the partition wall becomes greater than or equal to 1.5 times the total cross sectional area of the inside diameters of the cooling water injection nozzles, and is, for example, approximately greater than or equal to 100 mm.
  • the cross sectional area of the flow path in the width direction of the steel plate is not greater than or equal to 1.5 times the total cross sectional area of the inside diameters of the cooling water injection nozzles, the drainage cooling water drained to the upper surface of the partition wall 15 from each water drainage port 17 in the partition wall cannot be drained smoothly in the width direction of the steel plate.
  • the range of water flow rate at which the greatest effect is provided is a range of values greater than or equal to 1.5 m 3 /(m 2 ⁇ min). If the water flow rate is lower therethan, the retained water membrane does not become so thick that, even if a publicly known technology for cooling a steel plate by causing rod-like cooling water to fall freely is applied, there are cases in which temperature irregularities in a width direction do not become large. In contrast, even when the water flow rate is greater than 4.0 m 3 /m 2 ⁇ min, the use of the technology according to the present invention is effective. However, since there are practical problems such as an increase in facility costs, the most practical water flow rate is from 1.5 to 4.0 m 3 /m 2 ⁇ min.
  • the application of the cooling technology according to the present invention is particularly effective when draining rollers are disposed in front of and behind the cooling header.
  • the header is relatively long in a longitudinal direction (when its length is approximately 2 to 4 m)
  • a cooling apparatus at a side of the lower surface of the steel plate is not particularly limited to certain apparatus.
  • a cooling lower header 12 including circular tube nozzles 14 as with the cooling apparatus at the upper surface side is shown as an example.
  • a partition wall 15 for draining cooling water in the width direction of the steel plate need not be provided as it is for cooling the side of the upper surface of the steel plate.
  • a publicly known technology for supplying, for example, membranous cooling water or spray cooling water may be used.
  • the first shape correcting apparatus 5 By correcting the shape of the steel plate 1 by the first shape correcting apparatus 5, it is possible to bring the injection nozzles of the descaling apparatus 4 closer to the surface of the steel plate 1.
  • the jetting distance H distance between each injection nozzle of the descaling apparatus 4 and the surface of the steel plate 1 is set from 40 mm to 200 mm, descaling capability is increased. Since it is sufficient for, for example, the jetting flow rate and the jetting pressure for obtaining a predetermined energy density E to be small, it is possible to reduce pumping power of the descaling apparatus 4.
  • the accelerated cooling apparatus 6 is such that the cooling water supplied from the upper-portion cooling water injection nozzles 13 via the water supply ports 16 cool the upper surface of the steel plate 1 and becomes drainage hot water, and flows in the width direction of the steel plate 1 from locations above the partition wall 15 with the water drainage ports 17 in which the upper-portion cooling water injection nozzles 13 are not inserted being water drainage paths.
  • the drainage water after the cooling is quickly removed from the steel plate 1. Therefore, when portions of the cooling water flowing from the upper-portion cooling water injection nozzles 13 via the water supply ports 16 successively contact the steel plate 1, it is possible to provide sufficient cooling power that is the same in the width direction.
  • temperature irregularities in the width direction of the steel plate subjected to accelerated cooling are approximately 40°C when descaling such as that according to the present invention is not performed.
  • temperature irregularities in the width direction of the steel plate subjected to accelerated cooling are reduced to approximately 10°C after performing descaling by using the descaling apparatus 4 according to the present invention with the energy density of cooling water being greater than or equal to 0.10 J/mm 2 .
  • temperature irregularities in the width direction of the steel plate subjected to accelerated cooling by using the accelerated cooling apparatus 6 shown in Fig. 4 are reduced to approximately 4°C.
  • Temperature irregularities of the steel plate in the width direction were calculated from the results of measurement of a steel plate surface temperature distribution after the accelerated cooling by a scanning-type thermometer.
  • any distortion that has occurred during rolling is corrected by the first shape correcting apparatus 5, and descaling of the steel plate 1 is performed by the descaling apparatus 4, to stabilize controllability of the cooling. Therefore, the steel plate 1 whose shape is to be corrected by the second shape correcting apparatus 7 originally has high flatness and the temperature of the steel plate 1 is uniform. Consequently, correction reaction force of the second shape correcting apparatus 7 need not be very high.
  • the distance between the accelerated cooling apparatus 6 and the second shape correcting apparatus 7 may be longer than a longest length of the steel plate 1 that is produced in a rolling manufacturing line. By this, for example, reverse correction may often by performed by the second shape correcting apparatus 7.
  • time t from after the end of removal of scale on the steel plate 1 by the descaling apparatus 4 to the starting of the cooling of the steel plate 1 by the accelerated cooling apparatus 6 is desirably less than or equal to 42 s, more desirably, less than or equal to 19 s, and, even more desirably, less than or equal to 5 s.
  • the energy density of cooling water is a value defined by "the aforementioned water flow rate ⁇ jetting pressure ⁇ collision time".
  • the collision time (s) is the time during which descaling water is jetted to the surface of the steel plate, and is obtained by dividing the spray jet thickness by the transport velocity.
  • the accelerated cooling apparatus 6 was formed into a facility provided with flow paths allowing the cooling water supplied to the upper surface of the steel plate to flow to locations above the partition wall as shown in Fig. 4 , and to be drained from a side in the width direction of the steel plate as shown in Fig. 7 .
  • holes each having a diameter of 12 mm, were formed in a grid pattern, and, as shown in Fig. 6 , the upper-portion cooling water injection nozzles were inserted in the corresponding water supply ports arranged in a staggered pattern form, and the remaining holes were used as water drainage ports.
  • the distance between the lower surface of the upper header and the upper surface of the partition wall was 100 mm.
  • Each upper-portion cooling water injection nozzle of the accelerated cooling apparatus 6 having an inside diameter of 5 mm, an outside diameter of 9 mm, and a length of 170 mm, was such that the upper end of each nozzle was caused to protrude into the interior of the header.
  • the jetting velocity of rod-like cooling water was 8.9 m/s.
  • the nozzle pitch in the width direction of the steel plate being 50 mm, and the nozzles were arranged side by side in 10 rows in the longitudinal direction in a zone in which the distance between table rollers was 1 m.
  • the water flow rate at the upper surface was 2.1 m 3 /(m 2 ⁇ min).
  • each nozzle for cooling the upper surface was set so as to be at an intermediate position between the upper and lower surfaces of the partition wall having a plate thickness of 25 mm.
  • the distance from the lower end of each nozzle for cooling the upper surface to the surface of the steel plate was 80 mm.
  • a cooling facility that was the same as the upper surface cooling facility except that a partition wall was not included was used, and the water flow rate and the jetting velocity of the rod-like cooling water were 1.5 times those in the upper surface cooling facility.
  • the distance L from the descaling apparatus 4 to the accelerated cooling apparatus 6, the transport velocity V of the steel plate, and the time t from the descaling apparatus 4 to the accelerated cooling apparatus 6 were variously changed.
  • the shape of the steel plate was evaluated on the basis of an additional correction rate (%). More specifically, if warp of the entire length of the steel plate and/or warp in the entire width of the steel plate were within a standard value determined on the basis of product standards corresponding to those of the steel plate, the result was "pass", whereas if they exceeded the standard value, the result was "member to be subjected to additional correction", and the additional correction rate was calculated by the formula "(number of members to be subjected to additional corrections)/(all members)) ⁇ 100".
  • Example 1 of present invention Yes 130 8.3 ⁇ 10 -4 3.6 ⁇ 10 -6 0.60 5 0.32 9.4 ⁇ 10 -3 16 5 1.65
  • Example 2 of present invention Yes 130 8.3 ⁇ 10 -4 3.6 ⁇ 10 -6 0.32 5 0.6 5.0 ⁇ 10 -3 8 4 1.65
  • Example 3 of present invention Yes 130 8.3 ⁇ 10 -4 3.6 ⁇ 10 -6 0.10 5 1.9 1.6 ⁇ 10 -3 3 2 1.65
  • Example 4 of present invention Yes 130 8.3 ⁇ 10 -4 3.6 ⁇ 10 -6 0.60 14 0.32 9.4 ⁇ 10 -3 44 12 1.65
  • Example 5 of present invention Yes 130 8.3 ⁇ 10 -4 3.6 ⁇ 10 -6 0.60 5 0.32 9.4 ⁇ 10 -3 44 12 1.65
  • Example 5 of present invention Yes 130 8.3 ⁇ 10 -4 3.6 ⁇ 10 -6 0.60 5 0.32 9.4 ⁇ 10 -3 44 12 1.65
  • Example 5 of present invention Yes 130 8.3 ⁇ 10 -4 3.6 ⁇ 10
  • Examples 1 to 5 of the present invention in Table 1 since the energy densities were greater than or equal to 0.10 J/mm 2 , the additional correction rates, resulting from unsuitable shapes, were low, so that good results were obtained. This is thought to be because, when the cooling was performed by the accelerated cooling apparatus 6, the cooling was uniformly performed almost without any variations in the surface temperature at locations in the width direction, and flatness thought to result from the temperature distribution of the steel plate was excellent, as a result of which the additional correction rates, resulting from improper shapes, were reduced. In Examples 1 to 5, scale was removed, so that surface properties were good.
  • the surface properties were evaluated by determining the existence/absence of scale from image processing performed by using an image of the surface of the steel plate cooled to room temperature, the image processing making use of the difference between the color tones of a portion where the scale remained and a portion where the scale had been removed.
  • the time t from after the end of the removal of scale on the steel plate 1 by the descaling apparatus 4 to the starting of the cooling of the steel plate 1 by the accelerated cooling apparatus 6 was less than or equal to 19 s, corresponding to a condition in which the cooling by the accelerated cooling apparatus 6 stabilized, regardless of the transport velocity V of the steel plate. Therefore, the additional correction rate was good at a value less than or equal to 5%.
  • Example 5 of the present invention good results were obtained by setting the energy density within the range of the present invention without a high collision pressure (1.0 MPa), such as those in Patent Literature 1 and Patent Literature 2, being required.
  • Comparative Example 2 by partly removing the scale, the temperature distribution in the width direction of the steel plate became poor and, thus, the flatness of the steel plate also became poor. Therefore, the additional correction rate was 70%.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (7)

  1. Equipement pour fabriquer une plaque en acier comprenant :
    un appareil de laminage à chaud (3), un appareil de correction de forme (5), un appareil de décalaminage (4) et un appareil de refroidissement accéléré (6) qui sont disposés dans cet ordre à partir d'un côté amont dans une direction de transport, l'appareil de refroidissement accéléré (6) comprenant un collecteur (11) qui fournit de l'eau de refroidissement à une surface supérieure de la plaque en acier (1), et des rouleaux de drainage (20) placés à l'avant et à l'arrière du collecteur (11),
    caractérisé en ce que l'appareil de décalaminage (4) est agencé pour éjecter de l'eau de refroidissement vers une surface d'une plaque en acier (1) avec une densité d'énergie E supérieure ou égale à 0,10 J/mm2, dans lequel la densité d'énergie E est définie : soit par E = Q / d × W × ρ v 2 / 2 × t ,
    Figure imgb0014
     où Q : débit d'éjection d'eau de décalaminage [m3/s], d : épaisseur de jet pulvérisé [mm] d'une buse plate, W : largeur de jet pulvérisé [mm] d'une buse plate, p : densité de fluide [kg/m3], v : vitesse de fluide [m/s] pendant la collision au niveau d'une plaque en acier, et t : temps de collision [s] ;
    soit par la densité de quantité d'écoulement d'eau x la pression d'éjection x le temps de collision,
    dans lequel la densité de quantité d'écoulement d'eau [m3/(mm2.min)] est calculée par le débit d'éjection d'eau de refroidissement ÷ l'aire de collision d'eau de refroidissement, la pression d'éjection [MPa] est définie par la pression d'éjection d'eau de refroidissement, et le temps de collision [s] est calculé par l'épaisseur de collision d'eau de refroidissement ÷ la vitesse de transport de la plaque en acier,
    l'équipement étant caractérisé en outre en ce que l'appareil de refroidissement accéléré (6) comprend en outre :
    des buses d'injection d'eau de refroidissement (13) qui sont agencées en rangées, chaque rangée comprenant des buses d'injection d'eau de refroidissement agencées côte à côte dans une direction de largeur de la plaque en acier (1) et suspendues au collecteur (11), les buses d'injection d'eau de refroidissement (13) dans une rangée du côté le plus en amont étant inclinées en amont dans la direction de transport, et les buses d'injection d'eau de refroidissement (13) dans une rangée du côté le plus en aval étant inclinées en aval dans la direction de transport.
  2. Equipement pour fabriquer une plaque en acier selon la revendication 1, dans lequel, la vitesse de transport V [m/s] de l'appareil de décalaminage (4) jusqu'à l'appareil de refroidissement accéléré (6) et une température de plaque en acier T [K] avant le refroidissement, et une distance L [m] de l'appareil de décalaminage (4) jusqu'à l'appareil de refroidissement accéléré (6) satisfont à la formule : L ≤ V × 5 × 10 − 9 × exp 25000 / T .
    Figure imgb0015
  3. Equipement pour fabriquer une plaque en acier selon la revendication 2, dans lequel l'appareil de décalaminage (4) et l'appareil de refroidissement accéléré (6) sont disposés de sorte que la distance L de l'appareil de décalaminage (4) jusqu'à l'appareil de refroidissement accéléré (6) soit inférieure ou égale à 12 m.
  4. Equipement pour fabriquer une plaque en acier selon l'une des revendications 1 à 3, dans lequel une distance d'éjection H d'une buse d'injection de l'appareil de décalaminage (4) jusqu'à la surface de la plaque en acier (1) est supérieure ou égale à 40 mm et inférieure ou égale à 200 mm.
  5. Equipement pour fabriquer une plaque en acier selon l'une quelconque des revendications 1 à 4, dans lequel l'appareil de refroidissement accéléré (6) comprend en outre une paroi de séparation (15) qui est placée entre la plaque en acier (1) et le collecteur (11),
    dans lequel la paroi de séparation (15) est pourvue d'une pluralité d'orifices d'alimentation en eau (16) dans lesquels les extrémités inférieures des buses d'injection d'eau de refroidissement (13) sont insérées et d'une pluralité d'orifices d'évacuation d'eau (17) qui évacuent l'eau de refroidissement fournie à la surface supérieure de la plaque en acier (1) vers des emplacements au-dessus de la paroi de séparation (15), et dans lequel les buses d'injection d'eau de refroidissement sont agencées pour éjecter l'eau de refroidissement sous forme de tige.
  6. Utilisation de l'équipement selon l'une quelconque des revendications 1 à 5 dans un procédé pour fabriquer une plaque en acier comprenant :
    une étape de laminage à chaud en utilisant l'appareil de laminage à chaud (3), une étape de correction à chaud en utilisant l'appareil de correction de forme (5), et une étape de refroidissement accéléré en utilisant l'appareil de refroidissement accéléré (6) qui sont effectuées dans cet ordre pour fabriquer la plaque en acier (1), le procédé comprenant en outre :
    une étape de décalaminage en utilisant l'appareil de décalaminage (4) pour éjecter de l'eau de refroidissement ayant une densité d'énergie E supérieure ou égale à 0,10 J/mm2 vers une surface de la plaque en acier (1) entre l'étape de correction à chaud et l'étape de refroidissement.
  7. Utilisation de l'équipement selon la revendication 6, dans laquelle un temps t [s] de la fin de l'étape de décalaminage au commencement de l'étape de refroidissement accéléré satisfait à la formule : t ≤ 5 × 10 − 9 × exp 25000 / T ,
    Figure imgb0016
    où T : température de plaque en acier (K) avant le refroidissement.
EP14775597.9A 2013-03-27 2014-03-20 Dispositif et procédé de fabrication d'une tôle d'acier épaisse Active EP2979770B1 (fr)

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JP2013065342 2013-03-27
PCT/JP2014/001615 WO2014156086A1 (fr) 2013-03-27 2014-03-20 Dispositif et procédé de fabrication d'une tôle d'acier épaisse

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JP2016182622A (ja) * 2015-03-26 2016-10-20 Ｊｆｅスチール株式会社 継目無鋼管素材穿孔用プラグの余剰スケール除去方法及び装置並びに前記プラグの使用方法
JP6583561B2 (ja) * 2016-08-09 2019-10-02 東芝三菱電機産業システム株式会社 圧延機の出側温度制御システム
RU2741033C1 (ru) * 2017-09-28 2021-01-22 ДжФЕ СТИЛ КОРПОРЕЙШН Производственная установка для производства стального листа и способ производства стального листа

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EP2979770A1 (fr) 2016-02-03
TWI565541B (zh) 2017-01-11
EP2979770A4 (fr) 2016-03-16
KR20150138269A (ko) 2015-12-09
JPWO2014156086A1 (ja) 2017-02-16
CN105102142B (zh) 2018-06-12
TW201501829A (zh) 2015-01-16
KR101742607B1 (ko) 2017-06-01
WO2014156086A1 (fr) 2014-10-02
CN105102142A (zh) 2015-11-25

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