EP1935522B1 - Reversing rolling mill with cooling facility and corresponding method of cooling a steel plate or sheet - Google Patents

Reversing rolling mill with cooling facility and corresponding method of cooling a steel plate or sheet Download PDF

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Publication number
EP1935522B1
EP1935522B1 EP06783167.7A EP06783167A EP1935522B1 EP 1935522 B1 EP1935522 B1 EP 1935522B1 EP 06783167 A EP06783167 A EP 06783167A EP 1935522 B1 EP1935522 B1 EP 1935522B1
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EP
European Patent Office
Prior art keywords
cooling water
sheet
jets
cooling
steel plate
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EP06783167.7A
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German (de)
English (en)
French (fr)
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EP1935522A4 (en
EP1935522A1 (en
Inventor
Naoki Nakata
Takashi Kuroki
Akio Fujibayashi
Shogo Tomita
Masayuki Horie
Shunichi Nishida
Naoto Hirata
Michio Sato
Kyohei Ishida
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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
    • B21B45/02—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
    • 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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product

Definitions

  • the present invention relates to a reverse rolling mill and a method of cooling a steel plate or sheet according to the preamble of claims 1 and 12 respectively (see, for example, JP 2001/286 925 A ).
  • thick steel plates having high quality are produced by subjecting a rolled material to controlled rolling (CR). That is, a slab heated to 1000°C or more is rolled to a predetermined thickness, and is then rolled again to a final thickness in a state in which the temperature of the rolled material is in a non-recrystallization temperature range or a temperature range close thereto.
  • a slab having a thickness of 200 to 300 mm is heated to about 1100 to 1200°C, and is rolled to about 1.5 to 2 times the final thickness.
  • controlled rolling is started, and the slab is rolled to the final thickness (e.g., 15 mm).
  • controlled rolling start temperature when the temperature at which controlled rolling is performed (controlled rolling start temperature) is low and the thickness with which controlled rolling is performed (controlled rolling start thickness) is large, much time is taken for the temperature of the rolled material to reach the controlled rolling start temperature. Therefore, the rolled material should wait in air cooling state or shower cooling state on a rolling line near a rolling mill (reversing rolling mill) until the material temperature reachs controlled rolling start temperature. As a result, waiting time is caused in the rolling mill by waiting for cooling, and this reduces the rolling productivity.
  • Japanese Unexamined Patent Application Publication No. 55-106615 discloses a controlled rolling method in which a shower-type cooling device is disposed at each of the front and rear sides of a reversing rolling mill and a rolled material is rolled by the reversing rolling mill in each rolling path while being cooled by water in the cooling device.
  • Japanese Unexamined Patent Application Publication No. 2005-000979 discloses a technique in which water cooling equipment(temperature adjustment cooling equipment) is provided, and a material rolled to a predetermined thickness by a reversing rolling mill is cooled by water to the predetermined controlled rolling start temperature in the water cooling equipment, and is rolled again to the final thickness by reversing rolling mill.
  • This water cooling equipment is placed at a distance of about 20 m from the reversing rolling mill in order to avoid interference of rolling of another.
  • a damming rolls can be used as a method for damming cooling water remaining on the upper surface of the steel plate.
  • conveyance trouble for example, a conveyed steel plate will collide with the damming rolls.
  • Another method is flashing by use of air jet. However, this is not effective for a high flow rate of cooling water.
  • temperature adjustment cooling to the predetermined controlled rolling start temperature is performed by the water cooling equipment disposed at a distance of about 20 m from the rolling mill. Therefore, much time is taken to perform cooling including conveyance of the steel plate, and it is impossible to sufficiently prevent the reduction in rolling productivity.
  • Japanese Unexamined Patent Application Publication No. 62-260022 discloses a technique of cooling a steel plate by supplying cooling water thereto.
  • a slit nozzle unit for ejecting jets of cooling water opposing in the transferring direction of the steel plate is moved up and down, and is used together with laminar nozzles and spray nozzles provided separately. This ensures a wide range of cooling rates.
  • Japanese Unexamined Patent Application Publication No. 59-144513 discloses another technique of cooling a steel plate by supplying cooling water thereto. This publication states that a high cooling rate can be obtained by ejecting cooling water films from obliquely opposing headers having slit-shaped nozzles, and by filling the space between the steel plate and partition plates with the cooling water.
  • Japanese Unexamined Patent Application Publication No. 2001-286925 discloses a further technique of cooling a steel plate by supplying cooling water thereto.
  • slit-shaped nozzles or flat spray nozzles are respectively disposed on the upstream and downstream sides of the steel plate and above the steel plate, and cooling water is ejected from these nozzles at a jet angle (an angle with respect to the normal to the steel plate) within the range of 20 to 60° such that the jets of cooling water oppose each other. Consequently, the cooling water on the steel plate can uniformly flow, and nonuniform cooling can be prevented.
  • Cooling water can be shaped into films only when the jet openings are always maintained in a clean state. For example, when a jet opening of a slit nozzle 52 is clogged by a foreign substance 60 adhering thereto, as shown in Fig. 15 , a cooling water film or curtain 53 is broken. Further, the cooling water needs to be jet with a high pressure so as to be dammed in a jet area (cooling area).
  • the present invention has been made with view of the above-described circumstances, and aims to provide cooling equipment and a cooling method for a steel plate or sheet which can properly cool the steel plate or sheet with a compact size on a hot rolling line.
  • the present invention also aims to provide hot rolling equipment and a hot rolling method for a steel plate or sheet in which the steel plate or sheet is uniformly cooled during controlled rolling and a high product quality is achieved, and in which the reduction in rolling productivity due to, for example, waiting for cooling can be prevented.
  • the present invention also aims to provide cooling equipment and a cooling method for a steel plate or sheet in which the steel plate or sheet can be uniformly and stably cooled at a high cooling rate when cooling water is supplied onto an upper surface of the steel plate or sheet.
  • JP 2002 066605 A provides a rolling apparatus and method adaptable to various kinds of steel capable of micronizing a metal structure with an inexpensive machine structure using a reversible rolling mill.
  • a hot rolling apparatus comprising a reversible hot rolling mill 100 that repeatedly rolls a rolling material changing a pass direction and heat insulators 4, 5 that uncoil and wind the rolling material from the rolling mill and keep a temperature of the rolling material after rolling, there are mounted, at both sides of an inlet and an outlet of the rolling mill, a cooling means capable of cooling down the rolling material to the temperature of not more than an Ar1 transformation point, and a heating means capable of heating the rolling material to the temperature of not less than an Ac1 transformation point or not less than an Ac3 transformation point.
  • the uncoiled rolling material is cooled down to the temperature of not more than the Ar1 transformation point and, after being rolled at this temperature, the rolling material is reheated to the temperature of not less than the Ac3 transformation point, and a rolling pass for winding the rolling material is repeatedly conducted changing the pass direction.
  • EP 1 527 829 A1 relates to a cooling apparatus for hot rolled steel strip comprising: top surface cooling means provided above a hot rolled steel strip transferred with transfer rollers after hot rolling to cool the top surface of the hot rolled steel strip; and bottom surface cooling means provided below the hot rolled steel strip to cool the bottom surface of the hot rolled steel strip, each of the top surface cooling means and the bottom surface cooling means comprising: a protective member disposed close to the surface of the hot rolled steel strip, having at least one cooling water passage hole; at least one cooling water header opposing the hot rolled steel strip separated by the protective member; and cooling water jetting nozzles protruding from the cooling water header and jetting cooling water approximately vertically toward the surface of the hot rolled steel strip through the cooling water passage hole, wherein the tips of the cooling water jetting nozzles are disposed farther from the hot rolled steel strip than the surface, opposing the hot rolled steel strip, of the protective member.
  • the hot rolled steel strip can be stably transferred, and cooled rapidly and uniformly,
  • the present invention has the features recited in the independent claims 1 and 12 set out below.
  • the dependent claims 2 to 11 and 13 to 22 are directed to optional features and preferred embodiments.
  • the length of the equipment is short.
  • the nozzles are arranged so that jets of cooling water oppose each other on the steel plate or sheet in the transferring direction, the supplied cooling water itself dams remaining cooing water on the steel plate or sheet, and draining can be performed without an additional device such as a damming rolls.
  • the steel plate or sheet can be properly cooled with a compact size on the hot rolling line.
  • the pass-type cooling equipment having a high water flow rate of 4 m 3 /m 2 min or more is disposed close to the reversing rolling mill, the predetermined controlled rolling start temperature can be efficiently obtained by simultaneously rolling and cooling the steel plate or sheet, and this avoids the decrease in rolling productivity due to, for example, waiting for cooling.
  • the nozzles are arranged so that the jets of cooling water oppose each other in the transferring direction on the steel plate or sheet, and the cooling water is supplied at a high water flow rate of 4 m 3 /m 2 min or more. Therefore, the supplied cooling water itself dams the remaining cooling water on the steel plate or sheet and properly performs draining. This achieves a stable cooling area.
  • the steel plate or sheet is uniformly cooled during controlled rolling, and a high product quality is obtained.
  • the reduction in rolling productivity due to, for example, waiting for cooling can be prevented.
  • the present invention allows the steel plate or sheet to be uniformly cooled to the target temperature at a high cooling rate. As a result, a high-quality steel plate or sheet can be produced.
  • Fig. 1 is a layout view of hot rolling equipment for a steel plate or sheet according to an embodiment of the present invention.
  • a reheating furnace 11, a reversing rolling mill 12, and cooling equipment 20 are arranged in this embodiment.
  • the cooling equipment 20 is provided close to each of the entrance side (upstream side) and the exit side (downstream side) of the reversing rolling mill 12.
  • the cooling equipment (also referred to as a cooling unit) 20 is pass-type cooling equipment, and includes an upper header unit 21 for supplying cooling water onto an upper surface of a steel plate or sheet 10 and a lower header 31 for supplying cooling water onto a lower surface of the steel plate or sheet 10, as shown in Fig. 2 .
  • reference numeral 13 denotes a table roller.
  • Figs. 3 and 16 are detailed views of the cooling equipment 20.
  • the cooling equipment 20 is provided between the reversing rolling mill 12 and a side guide 14 in Fig. 3 , and is provided on the upstream side (a reheating furnace side) of the side guide 14 and near the reversing rolling mill 12 in Fig. 16 .
  • the cooling equipment 20 includes the upper header unit 21 and the lower header 31, as described above.
  • the upper header unit 21 includes a pair of upper headers 21a and 21b.
  • an upper header close to the reversing rolling mill 12 is referred to as a first upper header 21a
  • an upper header remote from the reversing rolling mill 12 is referred to as a second upper header 21b.
  • the first upper header 21a and the second upper header 21b are respectively provided with cylindrical nozzles 22a and 22b arranged in the width direction of the steel plate or sheet.
  • the cylindrical nozzles 22a and 22b are also arranged in a plurality of rows in the transferring direction (herein, six rows in the transferring direction of the steel plate or sheet 10).
  • the cylindrical nozzles (first upper nozzles) 22a of the first upper header 21a and the cylindrical nozzles (second upper nozzles) 22b of the second upper header 21b are arranged so that rod-like jets of cooling water supplied from the nozzles 22a and rod-like jets of cooling water supplied from the nozzles 22b oppose each other in the transferring direction of the steel plate or sheet 10.
  • first upper nozzles 22a eject rod-like jets of cooling water 23a at an inclination ⁇ 1 (jet angle) from the side of the reversing rolling mill 12, and the second upper nozzles 22b eject rod-like jets of cooling water 23b at an inclination ⁇ 2 (jet angle) toward the reversing rolling mill 12.
  • a rod-like jet of cooling water in the present invention refers to cooling water jetted from a nozzle opening having a circular shape (including elliptical and polygonal shapes).
  • the rod-like jet flow of cooling water in the present invention does not refer to a spray jet, but refers to a continuous and straight flow of cooling water having a cross-section kept substantially circular while the flow heads from the nozzle opening to the steel plate or sheet.
  • the remaining cooling water 24 shown in Figs. 3 and 16 is stably formed by preventing the jet lines of rod-like jets of cooling water 23a from the first upper. nozzles 22a from intersecting the jet lines of rod-like jets of cooling water 23b from the second upper nozzle 22b. Consequently, rod-like jets of cooling water are ejected from the cylindrical nozzles in rows (innermost rows) closest to the opposite upper headers toward the film of remaining cooling water 24. This is preferable because the rod-like jets of cooling water from the nozzles do not break the rod-like jets of cooling water from the nozzles in the opposite upper header.
  • the remaining region length when the remaining region length is 1.5 m or less, the effect of the remaining water 24 will be relatively low in cooling of the steel plate or sheet 10. Therefore, it is possible to prevent non-uniform cooling at the leading or tail end of the steel plate or sheet 10, on which remaining water is unsteady.
  • Figs. 4A and 4B show layout examples of the cylindrical nozzles 22a and 22b attached to the upper headers 21a and 21b.
  • the cylindrical nozzles 22a are arranged in six rows in the transferring direction of the steel plate or sheet 10
  • the cylindrical nozzles 22b are arranged in six rows in the transferring direction.
  • a plurality of rows are arranged in the transferring direction because only one row of nozzles can fail to dam the remaining cooling water between the jet collision spots on the steel plate or sheet 10. Therefore, it is preferable that three or more rows be arranged in the transferring direction. It is more preferable that five or more rows be arranged.
  • the cylindrical nozzles are arranged in the plate or sheet width direction so that cooling water can be supplied over the entire width of the passing steel plate or sheet 10. While two upper headers are provided herein, they may be combined into one header, and the cylindrical nozzles 22a and 22b may be arranged in the header.
  • Cylindrical nozzles 32 are attached to each lower header 31 so as to eject rod-like jets of cooling water 33 from between the table rollers 13 and to supply the cooling water over the entire width of the passing steel plate or sheet 10.
  • cooling water is supplied from the upper headers 21a and 21b onto the upper surface of the steel plate or sheet 10 so that the water flow rate on the steel plate or sheet surface is 4 m 3 /m 2 min or more, according to the present invention.
  • cooling water is supplied from the lower headers 31 onto the lower surface of the steel plate or sheet 10 so that the water flow rate on the steel plate or sheet surface is 4 m 3 /m 2 min or more.
  • the remaining cooling water 24 shown in Figs. 3 and 16 is formed by being dammed by the supplied rod-like jets of cooling water 23a and 23b. In this case, when the water flow rate is low, damming is impossible. When the water flow rate exceeds a certain rate, the amount of remaining cooling water 24 can be dammed and drained from the widthwise edge of the plate or sheet smoothly.
  • a steel plate or sheet steel plate or sheet has a width of 2 to 5 m.
  • a volume of remaining cooling water can be constant, and a desired temperature drop can be obtained uniformly over the whole part of the steel plate or sheet 10 in passing during rolling.
  • the total waiting time for controlled rolling becomes shorter. For example, when the water flow rate is low, waiting for cooling can be avoided only in a thin plate rolling. By increasing the water flow rate, waiting for cooling can be avoided even in thicker plate rolling. The effect of reducing the total waiting time for controlled rolling becomes smaller at a higher water flow rate increases. Therefore, it is preferable to determine the water flow rate in consideration of the effect of reducing the total waiting time for controlled rolling and the equipment cost. A more preferable water flow rate is 4 to 10 m 3 /m 2 min.
  • the cooling equipment 20 In order to provide the cooling equipment 20 with a compact size and to cool the steel plate or sheet at the position close to the reversing rolling mill 12, the cooling equipment 20 is located so that the remaining region length is 1.5 m or less, the cooling area is 3 m or less, and the cooling equipment 20 is disposed at a position close to the reversing rolling mill 12, excluding the side guide provided on the entrance side and/or the exit side of the reversing rolling mill 12. In general, this position is set at a distance of 20 m or less from a work roll center 12a of the reversing rolling mill 12.
  • the cooling area outside the side guide so as not to overlap with the side guide, cooling water remaining on the upper surface of the steel plate or sheet 10 is smoothly drained from the widthwise edges of the steel plate or sheet 10 without being obstructed by the side guide 14.
  • the cooling area of the cooling equipment 20 may be provided close to the reversing rolling mill 12 on the upstream side of the side guide 14 disposed on the entrance side of the reversing rolling mill 12, or close to the reversing rolling mill 12 on the downstream side of the side guide 14 disposed on the exit side of the reversing rolling mill 13, as shown in Fig. 16 .
  • a large cooling equipment with a long cooling area can be set in a wide space.
  • the cooling area can be provided between the work roll center 12a of the reversing rolling mill 12 and the side guide 14, and on the upstream side of the side guide 14 shown in Fig. 16 .
  • the rod-like jets of cooling water 23a ejected from the first upper nozzles 22a oppose the rod-like jets of cooling water 23b ejected from the second upper nozzles 22b in the transferring direction of the steel plate or sheet 10. Therefore, the ejected rod-like jets of cooling water 23a and 23b dam the remaining cooling water 24 on the upper surface of the steel plate or sheet 10 that attempts to flow out of water cooling area. Consequently, even when the cooling water is supplied at a high water flow rate of 4 m 3 /m 2 min or more, a stable cooling area can be obtained, and uniform cooling can be performed.
  • the cooling water ejected from the upper nozzles 22a and 22b is not in a film shape obtained by using slit nozzles or the like, but is in a rod shape because the rod-like jet of cooling water can form a more stable flow and has a stronger force for damming the remaining cooling water.
  • the jet angle ⁇ 1 of the first upper nozzles 22a and the jet angle ⁇ 2 of the second upper nozzles 22b is 30° to 60°. If the jet angle ⁇ 1 and the jet angle ⁇ 2 are less than 30°, it is necessary to place the first upper nozzles 22a and the second upper nozzles 22b far apart from each other, and the length of the equipment increases. Moreover, vertical velocity components of the rod-like jets of cooling water 23a and 23b decrease, the rod-like jets of cooling water 23a and 23b do not strike the steel plate or sheet 10 hard, and the cooling ability is reduced.
  • the jet angle ⁇ 1 and the jet angle ⁇ 2 are more than 60°, the velocity components of the rod-like jets of cooling water 23a and 23b in the transferring direction decrease, and the force for damming the remaining cooling water 24 decreases.
  • the jet angle ⁇ 1 and the jet angle ⁇ 2 do not always need to be equal to each other. More preferably, the jet angle ⁇ 1 and the jet angle ⁇ 2 are set at 40° to 50°.
  • a plurality of rows at least three rows of nozzles for jetting the cooling water be provided in the transferring direction and the direction opposite the transferring direction. More preferably, at least five rows are provided.
  • the upper limit of number of rows can be appropriately determined in accordance with the size of the steel plate or sheet to be cooled, the transferring speed, and the target temperature drop.
  • the jet velocity exceeds 30 m/s, pressure loss increases, and wear of the nozzle inner surface increases. Further, the pump capacity and the outer diameter of the pipes increase, and the equipment cost becomes too high. For this reason, it is preferable that the jet velocity be 30 m/s or less.
  • the distance between the nozzles adjacent on an imaginary line drawn in the plate width direction is set to be ten times the nozzle inner diameter or less.
  • Fig. 4A shows a layout example in which six rows of nozzles are provided in the transferring direction while the distance between the adjacent nozzles is 40 mm
  • Fig. 4B shows a layout example in which four rows of nozzles are provided in the transferring direction while the distance between the adjacent nozzles is 40 mm and two rows of nozzles are provided in the transferring direction while the distance between the adjacent nozzles is 20 mm.
  • the leading ends of the upper nozzles 22a and 22b be apart from the pass line. However, if the leading ends are too apart, cooling water is dispersed. Therefore, it is preferable that the distance between the leading ends of the upper nozzles 22a and 22b and the pass line be 500 to 1800 mm.
  • a steel plate or sheet which passes through the cooling area of the cooling equipment 20 before and/or during and/or after rolling, is rolled by the reversing rolling mill 12 while being cooled by the cooling equipment 20 so that a predetermined controlled rolling start temperature (e.g. 850°C or less) is achieved at a predetermined controlled rolling start thickness (e.g., 1.5 to 2 times the final thickness).
  • a predetermined controlled rolling start temperature e.g. 850°C or less
  • a predetermined controlled rolling start thickness e.g. 1.5 to 2 times the final thickness.
  • the cooling equipment 20 is appropriately turned on and off so that the predetermined controlled rolling start temperature is obtained at the predetermined controlled rolling start thickness.
  • cooling equipment (cooing units) 20 including a pair of upper headers 21a and 21b, as shown in Fig. 2
  • an intermediate header 21c can be provided between the upper headers 21 and 21b, as shown in Fig. 5 , in order to obtain a higher cooling ability by combining the cooling units to some extent. Any number of upper headers can be adopted.
  • cooling equipment 20 is provided on each of the entrance side and the exit side of the reversing rolling mill 12, it may be provided on one of the sides.
  • the length of the equipment is short. Further, since the upper nozzles 22a and 22b are arranged so that the jets of cooling water oppose each other in the transferring direction on the steel plate or sheet 10, the supplied rod-like jets of cooling water 23a and 23b themselves dam the remaining cooling water 24 on the steel plate or sheet 10, thus performing draining. Draining is properly performed without any additional device such as a damming rolls. As a result, the steel plate or sheet can be properly cooled with a compact structure on the hot rolling line, for example, during controlled rolling.
  • the pass-type cooling equipment 20 having a high water flow rate of 4 m 3 /m 2 min or more is disposed close to the reversing rolling mill 12, the predetermined control temperature can be efficiently obtained by simultaneously rolling and cooling the steel plate or sheet 10, and this avoids the reduction in rolling productivity due to, for example, waiting for cooling.
  • the cylindrical nozzles 22a and 22b are arranged so that the jets of cooling water therefrom oppose each other in the transferring direction on the steel plate or sheet 10, and the cooling water is supplied at a high water flow rate of 4 m 3 /m 2 min or more . Therefore, the rod-like jets of cooling water 23a and 23b themselves dam the remaining cooling water 24 on the steel plate or sheet 10 and properly perform draining. This achieves a stable cooling area.
  • the steel plate or sheet is uniformly cooled during controlled rolling, and a high product quality can be obtained. Moreover, the rolling productivity is prevented from being reduced by, for example, waiting for cooling.
  • the cooling water may have any shape that can be supplied at the water flow rate of 4 m 3 /m 2 min or more on the steel plate or sheet surface, for example, a cooling water film ejected from a slit nozzle, or cooling water sprayed by a spray nozzle.
  • the upper headers 21a and 21b are provided above the steel plate or sheet 10, and the upper nozzles 22a and 22b that eject rod-like jets of cooling water at a water flow rate of 4 m 3 /m 2 min or more are connected to the upper headers 21a and 21b.
  • the inclinations ⁇ 1 and ⁇ 2 formed by the rod-like jets of cooling water 23a and 23b and the steel plate or sheet 10 are 30° to 60°, the upper nozzles 22a and 22b are disposed so as to oppose each other in the transferring direction of the steel plate or sheet 10, and cooling water is supplied onto the upper surface of the passing steel plate or sheet 10.
  • the steel plate or sheet can be uniformly and stably cooled to the target temperature at a high cooling rate. As a result, a high-quality steel plate or sheet can be produced.
  • the jet directions of rod-like jets of cooling water 23a and 23b are set so that 0 to 35% of the velocity components in the jet directions of the rod-like: jets of cooling water 23a and 23b in the first embodiment shown in Fig. 2 head outward in the steel-plate or sheet width direction.
  • a more preferable range of ratio of the velocity components is 10 to 35%. Incidentally, when the ratio exceeds 35%, the equipment cost increases so as to prevent splash of the cooling water, and the vertical components of the rod-like jets of cooling water decrease. This reduces the cooling ability.
  • the jet directions of the rod-like jets of cooling water be set so that the jet velocity components of the rod-like jets of cooling water from 40 to 60% of all nozzles that eject the rod-like jets of cooling water include components that head in one of the two directions pointing outward in the steel-plate width direction perpendicular to the transferring direction. More specifically, if the number of nozzles pointing in one outward direction is 60% or more of the total number of nozzles and the cooling water is not uniformly drained from the plate or sheet ends, the rod-like jets of cooling water cannot dam the remaining cooling water at a position where the layer of the remaining cooling water is thick, and the temperature may vary in the width direction. Moreover, if the amount of splashed water extremely increases on the one outer side, the equipment cost for preventing the increase rises.
  • the remaining cooling water is smoothly drained by setting the number of nozzles at 20% or less of the total number of nozzles, and setting the number of nozzles pointing in one outward direction, of the remaining nozzles, so as to be substantially equal to the number of nozzles pointing in the other outward direction. This is most suitable for damming and draining of the remaining cooling water.
  • Fig. 8 shows the jet direction of a rod-like jet of cooling water.
  • the angle (substantial inclination) formed between the jet line of the rod-like jet of cooling water and the steel plate or sheet is designated as ⁇
  • the inclination with respect to the transferring direction is designated as ⁇
  • the angle (outward angle) at which the cooling water heads outward in the steel-plate or sheet width direction is designated as ⁇ .
  • Lw/L width-direction velocity component ratio
  • Table 1 shows the calculation results obtained when the height h of the nozzle opening is 900 mm and the inclination ⁇ with respect to the transferring direction is 45° and 50°.
  • the width-direction velocity component ratio is 0 to 35% when the inclination ⁇ with respect to the transferring direction is 45° and the outward angle ⁇ is 0 to 25°, and when the inclination ⁇ with respect to the transferring direction is 50° and the outward angle ⁇ is 0 to 30°.
  • a preferable ratio of the jet velocity component in the steel-plate or sheet width direction is 10 to 25%.
  • Fig. 6 described above is a plan view showing an example when the upper nozzles 22a and 22b are arranged according to the above.
  • the outward angle ⁇ of a rod-like jet of cooling water from the center nozzle in the steel-plate or sheet width direction is 0°, and the outward angle ⁇ gradually increases as the nozzle setting position is shifted outward in the steel-plate or sheet width direction.
  • the nozzles are disposed so that the positions where the rod-like jets of cooling water strike the steel plate or sheet are equally spaced (e.g., a pitch of 60 mm) in the steel-plate or sheet width direction.
  • Fig. 7 described above is a plan view showing another example in which the upper nozzles 22a and 22b are arranged according to the above.
  • the outward angle ⁇ of rod-like jets of cooling water is fixed (e.g., 20°), and the nozzles are disposed so that the positions where the rod-like jets of cooling water strike the steel plate or sheet are equally spaced (e.g., a pitch of 60 mm) in the steel-plate or sheet width direction.
  • nozzles that eject cooling water in both the rightward and leftward directions - need to be disposed near the center in the steel-plate or sheet width direction.
  • rows of nozzles that eject cooling water outward in one steel-plate or sheet width direction e.g., rows of nozzles having an upward jet component in Fig. 7
  • rows of nozzles that eject cooling water outward in the other steel-plate or sheet width direction e.g., rows of nozzles having a downward jet component in Fig. 7
  • a predetermined distance e.g. 20 mm
  • the number of rod-like jets of cooling water having components heading in one of the two directions pointing outward in the steel-plate or sheet width direction perpendicular to the transferring direction is equal to the number of rod-like jets of cooling water having components heating in the other direction. More specifically, the number of nozzles that eject rod-like jets of cooling water having components heading toward one outer side in the steel-plate or sheet width direction perpendicular to components in the steel-plate or sheet width direction is equal to the number of nozzles that eject rod-like jets of cooling water having components heading toward the other outer side.
  • draining can be performed with less water by increasing the outward angle ⁇
  • the range in which the nozzle density is high is increased near the center in the steel-plate or sheet width direction, as shown in Figs. 6 and 7 .
  • the outward angle ⁇ is determined in consideration of the ability of a pump that supplies water to the headers and the thickness of pipes so as to obtain a uniform flowrate distribution in the steel-plate or sheet width direction.
  • a wall and a drain hole are provided on each outer side of the above-described cooling equipment. This is effective in preventing the cooling water from leaking out of the equipment and splashing inside the equipment to form remaining water.
  • the outward angle ⁇ exceed 30°. This is because the equipment cost rises in order to prevent splash of the cooling water, the vertical components of the rod-like jets of cooling water decrease, and this reduces the cooling ability.
  • a cooling unit 40 is adopted instead of the cooling unit 20 adopted in the first embodiment shown in Fig. 1 .
  • shielding plates 26a and 26b are added above the innermost rows of rod-like jets of cooling water, as shown in Fig. 9 as a side view and Fig. 10 as a view taken from the direction of arrow A-A in Fig. 9 .
  • the shielding plates 26a and 26b can be respectively moved up and down by cylinders 27a and 27b.
  • the shielding plates 26a and 26b can be used only during product manufacturing, and can be raised to upper retracted positions in other cases.
  • the lowermost edges of the shielding plates 26a and 26b be disposed 300 to 500 mm above from an upper surface of a steel plate or sheet 10. That is, when the lowermost edges are disposed 300 mm or more above from the upper surface of the steel plate or sheet 10, even if a steel plate or sheet that is warped upward at the leading or tail end enters, it does not collide with the shielding plates 26a and 26b. However, when the height from the upper surface of the steel plate or sheet 10 exceeds 500 mm, it is impossible to sufficiently shield the splashed cooling water 25.
  • the shielding plates 26a and 26b shown in Fig. 9 may be replaced with light shielding curtains 28a and 28b having a smooth surface, as shown in Fig. 11 .
  • the shielding curtains 28a and 28b normally stand by in a hanging manner.
  • the shielding curtains 28a and 28b are raised along the innermost rows of rodlike jets of cooling water. In this case, the rodlike jets of cooling water 23a and 23b are violently ejected, and therefore, they are not disturbed.
  • a shielding plate 29 shown in Fig. 17 may be used.
  • the shielding plate 29 extends between the upper headers 21a and 21b and above the remaining cooling water 24.
  • Fig. 14 is a view showing the hot rolling line for a thick steel plate adopted in the first embodiment of the present invention, and conveyance patters.
  • the hot rolling line for a thick steel plate includes a reheating furnace 11, a reversing rolling mill 12, first cooling equipment 14, a hot leveler 15, and second cooling equipment 16.
  • accelerated cooling is performed after finish milling.
  • a slab extracted from the reheating furnace 11 is subjected to rough rolling and finish rolling by the reversing rolling mill 12 so as to have a thickness of 25 mm, is passed through the hot leveler 15, and is subjected to accelerated cooling by a temperature drop of 150°C in the second cooling equipment 16.
  • a conveyance pattern B temperature adjustment cooling is performed before controlled rolling.
  • a slab extracted from the reheating furnace 11 is roughly rolled to a thickness of 60 mm by the reversing rolling mill 12, is subjected to adjustment cooling by a temperature drop of 80°C in first cooling equipment 14, and is then subjected to low-temperature finish rolling, that is, controlled rolling.
  • conveyance was performed in the conveyance pattern A and the conveyance pattern B while one cooling unit of the same type as the cooling unit 20 shown in Fig. 2 was provided in the first cooling equipment 14, six cooling units were provided in the second cooling equipment 16.
  • the height of the leading ends of upper nozzles 22a and 22b from the table rollers was 1.2 m
  • the upper nozzles 22a and 22b were arranged in the layout shown in Fig. 4A
  • the nozzle inner diameter was 6 mm
  • the water flow rate was 6 m 3 /m 2 min
  • the jet angles ⁇ 1 and ⁇ 2 of rod-like jets of cooling water were 45°
  • the jet velocity was 8 m/s.
  • one unit was provided in the first cooling equipment 14 in which the nozzle layout shown in Fig. 7 was adopted, the height of the leading ends of the nozzles, the nozzle inner diameter, the water flow rate, the jet angles ⁇ 1 and ⁇ 2, and the jet velocity were the same as those in the first invention example, and the outward angle ⁇ of the rod-like jets of cooling water was fixed at 20°.
  • Six units of the same type were provided in the second cooling equipment 16. Conveyance was performed in the conveyance pattern A and the conveyance pattern B.
  • the position where the rod-like jets of cooling water strike the steel plate or sheet were spaced at a pitch of 60 mm in the steel-plate or sheet width direction.
  • conveyance was performed in the conveyance pattern A and the conveyance pattern B while each of the first cooling equipment 14 and the second cooling equipment 16 was formed by a known popular shower cooling device.
  • conveyance was performed in the conveyance pattern A and the conveyance pattern B while each of the first cooling equipment 14 and the second cooling equipment 16 was formed by the cooling device that eject cooling water films opposing each other, as shown in the above-described Patent Document 2.
  • a temperature distribution on the upper surface of the steel plate or sheet was found by continuously measuring the temperature of the steel plate or sheet in the width direction with a radiation thermometer after cooling (after sufficient recuperation). Temperature variations in a stationary portion excluding the leading end, the tail end, and the widthwise edges (difference between the highest temperature and the lowest temperature) was defined as a temperature difference, and the temperature differences in the cases were compared. The temperature difference substantially corresponded to variations in mechanical characteristics of the product such as the tensile strength. The production efficiency and yield were compared with reference to those in the first comparative example.
  • Table 2 shows the comparison results. Table 2 Conveyance Pattern Cooling Water Supply Method Outward Angle Temperature Difference Equipment Damage Production Efficiency Yield Equipment Cost Remarks A shower - 80°C ⁇ None Standard Standard ⁇ Low First Comparative Example Cooling Water Film - 80°C ⁇ Sporadic Reduced by 15% Reduced by 10% ⁇ High Second Comaparative Example Rodlike.
  • shower cooling was performed in the first comparative example.
  • the temperature difference was 80°C in the conveyance pattern A (accelerated cooling after finish rolling), and 40°C in the conveyance pattern B (temperature adjustment cooling before controlled rolling).
  • the product strength greatly varied.
  • the equipment was sometimes damaged when the steel plate or sheet was warped. Since the steel plate or sheet striking the equipment is defective as a product, the product yield was lower than in the first comparative example. Further, since much time was taken to repair the damaged equipment, the production efficiency also decreased. Since the cooling water films were supplied, deposits adhered to the nozzle openings and cooling water films were not formed. In this case, the cooling water could sometimes not be dammed within the jet area (within the cooling area). For this reason, by the influence of cooling water remaining on the steel plate or sheet, the temperature difference was 80°C in the conveyance pattern A (accelerated cooling after finish rolling), and 40°C in the conveyance pattern B (temperature adjustment cooling before controlled rolling). The product strength greatly varied.
  • the height of the nozzle leading ends was set high at 1.2 m. Therefore, the equipment was not damaged even when the steel plate or sheet was warped, the yield was not reduced by trouble, and the production efficiency was improved. Further, since rod-like jets of cooling water were ejected at high speed while opposing each other, the cooling water could be completely dammed within the cooling area, and the temperature difference could be limited to an extremely low value of 8 to 15°C.
  • cooling water ejected from the upper nozzles 22a and 22b onto the upper surface of the steel plate or sheet 10 merged and promptly dropped from the widthwise edges of the steel plate or sheet 10, as shown by arrows A in Fig. 7 .
  • the remaining cooling water 24 could be dammed and draining was performed with less water than when there is no outward angle ⁇ .
  • the temperature difference could be limited to an extremely low value of 6 to 12°C, and uniform cooling could be performed.
  • the cooling water could be dammed even when the flow rate and pressure ware slightly decreased, a high pressure and much water were not necessary for the equipment. This allowed economical equipment design.
  • the rolling time in this invention example and the rolling time in the related art were compared when manufacturing thick steel plates having a thickness of 18.5 mm, a width of 2560 mm, and a length of 35 m by controlled rolling.
  • the hot rolling equipment according to the above embodiment was used, and one cooling unit 20 of the same type as that shown in Fig. 2 was provided in the first cooling equipment 14, and six cooling units 20 of the same type were provided in the second cooling equipment 16.
  • the height of the leading ends of the upper nozzles 22a and 22b from the table rollers was 1.2 m
  • the upper nozzles 22a and 22b were arranged in the layout shown in Fig. 4A
  • the nozzle inner diameter was 6 mm
  • the water flow rate was 6 m 3 /m 2 min
  • the jet angles ⁇ 1 and ⁇ 2 of rod-like jets of cooling water were 45°
  • the jet velocity was 8 m/s.
  • a steel plate was rolled while being cooled by the cooling equipment 20 so that a predetermined controlled rolling start temperature (820°C) was obtained at a predetermined controlled rolling start thickness (34 mm). Subsequently, cooling by the cooling equipment 20 was stopped, and the steel plate was rolled to a final thickness of 18.5 mm.
  • Fig. 13 shows the results.
  • a white circle and a black circle respectively show rolling paths in both cases.
  • the time from extraction from the reheating furnace to completion of rolling was 205 seconds in the related art.
  • the time was reduced by 40 seconds to 165 seconds.
  • the product quality in the invention example was not inferior to that in the related art.
  • one cooling unit 20 of the same type of that shown in Fig. 2 was provided in the first cooling equipment 14, and six cooling units 20 of the same type were provided in the second cooling equipment 16.
  • the height of the leading ends of the upper nozzles 22a and 22b from the table rollers was 1.2 m
  • the upper nozzles 22a and 22b were arranged in the layout shown in Fig. 4A
  • the nozzle inner diameter was 6 mm
  • the water flow rate was 6 m 3 /m 2 min.
  • a steel plate or sheet was cooled by the cooling equipment shown in Fig. 6 or 7 .
  • the inclination ⁇ of rodlike jets of cooling water with respect to the transferring direction was 45°
  • the jet velocity was 8 m/s.
  • the cooling equipment shown in Fig. 6 was used, the outward angle ⁇ of rodlike jets of cooling water at the center in the steel-plate or sheet width direction was 0°, and the outward angle ⁇ of outermost rod-like jets of cooling water was 25°.
  • the positions where the rodlike jets of cooling water strike the steel-plate or sheet were spaced at a pitch of 60 mm in the steel-plate or sheet width direction.
  • the cooling equipment shown in Fig. 7 was used, the outward angle ⁇ of rod-like jets of cooling water was fixed at 20°, and the positions where the rodlike jets of cooling water strike the steel-plate or sheet were spaced at a pitch of 60 mm in the steel-plate or sheet width direction.
  • the jets of cooling water ejected from the upper nozzles 22a and 22b onto the upper surface of the steel-plate or sheet 10 merged and promptly dropped from the widthwise edges of the steel plate or sheet 10, as shown by arrows A in Figs. 6 and 7 .
  • the remaining cooling water 24 could be dammed and draining could be performed with less water than when there is no outward angle ⁇ .
  • a steel plate was cooled while one cooling unit of the same type as that of the cooling unit 40 shown in Fig. 9 or 11 was provided in the first cooling equipment 14 and six units of the same type were provided in the second cooling equipment 16.
  • the jet angles ⁇ 1 and ⁇ 2 of rodlike jets of cooling water were 45°, and the jet velocity was 12 m/s.
  • the remaining region length L was 0 mm.
  • the cooling unit 40 including the shielding plates 26a and 26b shown in Fig. 9 was used.
  • the shielding plates 26a and 26b were positioned 50 mm above the innermost rod-like jets of cooling water.
  • the distance in the transferring direction ( ⁇ in Fig. 9 ) from the lowermost ends of the shielding plates 26a and 26b to the positions where the outermost rows of rod-like jets of cooling water strike the steel plate 10 was 300 mm.
  • the cooling unit 40 including the shielding curtains 28a and 28b shown in Fig. 11 was used.
  • the distance in the transferring direction ( ⁇ in Fig. 11 ) from the lowermost ends of the shielding curtains 28a and 28b raised by ejection of the rod-like jets of cooling water to the positions where the outermost rows of rodlike jets of cooling water strike the steel plate 10 was 300 mm.
  • both the second and third invention examples could accurately prevent splashed cooling water 25 striking the steel plate 10 and splashing upward from dropping onto the rodlike jets of cooling water 23a and 23b. Consequently, cooling uniformity can be maintained.
  • the length of the equipment is short.
  • the nozzles are arranged so that jets of cooling water oppose each other in the transferring direction on the steel plate or sheet, the supplied cooling water itself dams remaining cooling water on the steel plate or sheet, thus performing draining. Therefore, draining is properly performed without an additional device such as a damming rolls. As a result, for example, in controlled rolling, the steel plate or sheet can be properly cooled with a compact size on the hot rolling line.
  • the pass-type cooling equipment having a high water flow rate of 4 m 3 /m 2 min or more is disposed close to the reversing rolling mill, the predetermined controlled rolling start temperature can be efficiently obtained by simultaneously rolling and cooling the steel plate or sheet. This prevents the rolling productivity from being reduced by waiting for cooling.
  • the nozzles are arranged so that the jets of cooling water oppose each other in the transferring direction on the steel plate or sheet, and the cooling water is supplied at a high water flow rate of 4 m 3 /m 2 min or more. Therefore, the supplied cooling water itself properly dams the remaining cooling water, and a stable cooling area can be obtained.
  • the steel plate or sheet is subjected to controlled rolling, it is uniformly cooled, and a high product quality can be obtained. Moreover, the rolling productivity can be prevented from being reduced by waiting for cooling.
  • the steel plate or sheet can be uniformly cooled to the target temperature at a high cooling rate. Consequently, a high-quality steel plate or sheet can be produced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP06783167.7A 2005-08-30 2006-08-29 Reversing rolling mill with cooling facility and corresponding method of cooling a steel plate or sheet Active EP1935522B1 (en)

Applications Claiming Priority (5)

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JP2005249055 2005-08-30
JP2005249060 2005-08-30
JP2005249061 2005-08-30
JP2006001568 2006-01-06
PCT/JP2006/317395 WO2007026906A1 (ja) 2005-08-30 2006-08-29 鋼板の冷却設備および冷却方法

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EP1935522A4 EP1935522A4 (en) 2011-05-11
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JP4960732B2 (ja) * 2007-03-14 2012-06-27 Ｊｆｅスチール株式会社 熱延鋼帯冷却設備
DK2100673T3 (da) * 2008-03-14 2011-05-09 Arcelormittal France Fremgangsmåde og indretning til blæsning af en gas på et fremførende bånd
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KR101209355B1 (ko) * 2009-05-13 2012-12-06 신닛테츠스미킨 카부시키카이샤 열연 강판의 냉각 방법
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CN114289531B (zh) * 2021-12-31 2024-05-10 浙江精瑞工模具有限公司 一种单程双面水除鳞系统

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CN101253009A (zh) 2008-08-27
EP1935522A4 (en) 2011-05-11
KR100973691B1 (ko) 2010-08-03
CN101253009B (zh) 2010-12-22
EP1935522A1 (en) 2008-06-25
KR20080034965A (ko) 2008-04-22
WO2007026906A1 (ja) 2007-03-08

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