EP1930092B1 - Linie und verfahren zum warmen rollen von stahl platte oder blech mit besonderer anordnung einer kühlanlage - Google Patents

Linie und verfahren zum warmen rollen von stahl platte oder blech mit besonderer anordnung einer kühlanlage Download PDF

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Publication number
EP1930092B1
EP1930092B1 EP06783171.9A EP06783171A EP1930092B1 EP 1930092 B1 EP1930092 B1 EP 1930092B1 EP 06783171 A EP06783171 A EP 06783171A EP 1930092 B1 EP1930092 B1 EP 1930092B1
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EP
European Patent Office
Prior art keywords
sheet
steel plate
tube
nozzles
cooling
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Application number
EP06783171.9A
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English (en)
French (fr)
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EP1930092A4 (de
EP1930092A1 (de
Inventor
Naoki Nakata
Takashi Kuroki
Akio Fujibayashi
Shogo Tomita
Shunichi Nishida
Naoto Hirata
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JFE Steel Corp
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JFE Steel Corp
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Publication of EP1930092A4 publication Critical patent/EP1930092A4/de
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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
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the 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 line for hot rolling a steel plate or sheet incorporating cooling equipment and a method of manufacturing the steel plate or sheet according to the preamble of claims 1 and 3 (see, for example, JP 60/166 413 U ).
  • a header 51 serving as an apron
  • a plurality of holes called multi-hole nozzles 52
  • a rod-like water flow 53 is supplied from the multi-hole nozzles 52 to the under surface of a steel plate or sheet 10. Supplying a relatively large amount of cooling water to the steel plate or sheet allows a high cooling speed to be obtained.
  • the technology discussed in Japanese Unexamined Patent Application Publication No. 10-263669 is provided.
  • the steel plate or sheet can be efficiently cooled as a result of disposing nozzles in a honeycomb arrangement.
  • the header 51 of under-side cooling equipment 50 also serves as an apron between the table rolls 14, when the steel plate or sheet 10 having a downwardly curved edge enters, the steel plate or sheet 10 collides with the header 51, thereby breaking the header 51. If the nozzles 52 are crushed or deformed as a result of breaking the header 51, the cooling uniformity is considerably deteriorated. Therefore, when this technology is used for a long time, it has equipment maintainability problems unless, for example, the header (apron) 51 is frequently replaced.
  • the cooling water 53 drops after being supplied to the steel plate or sheet 10, the cooling water 53 accumulates on the header (apron) 51, and forms a water film(or puddle) 54. Since the holes that are formed in the top surface of the header 51, serving as an apron, become the nozzles 52, newly supplied cooling water must break the water film(or puddle)54 for being supplied to the under surface of the steel plate or sheet 10. The larger the increase in the amount of cooling water, the thicker the water film (or puddle) 54 becomes, thereby reducing cooling efficiency.
  • the cooling water is drained through narrow gaps between the table rolls 14 and respective ends of the header (apron) 51, the drainage hinders the cooling using the newly supplied cooling water. Therefore, the cooling water cannot be efficiently used.
  • the present invention is achieved in view of the above-described circumstances, and has as its object the provision of steel plate or sheet cooling equipment which has good equipment maintainability, which has excellent draining property when supplying a large amount of cooling water to the under surface of a steel plate or sheet, and which performs efficient cooling uniformly in a widthwise direction, to achieve high cooling speed; and a method of manufacturing steel plate or sheet having high quality.
  • JP 60 1664413 U and EP 1 527 829 A1 Reference is also made to JP 60 1664413 U and EP 1 527 829 A1 .
  • the tube-shaped nozzles that supply cooling water to the under surface of the steel plate or sheet are protected by the protector plates, even if the steel plate or sheet having a downwardly curved edge enters, the tube-shaped nozzles are prevented from being damaged, so that equipment maintainability is good.
  • the tube-shaped nozzles are disposed in a predetermined arrangement, even if a large amount of cooling water is supplied to the under surface of the steel plate or sheet, the cooling water is smoothly drained from gaps between the tube-shaped nozzles, so that draining property is excellent. As a result, efficient cooling is performed uniformly in the widthwise direction to achieve high cooling speed, so that the steel plate or sheet having high quality can be manufactured.
  • the cooling water supplied from the tube-shaped nozzles is defined in the application as a rod-like water flow.
  • This rod-like water flow (also called a "columnar jet water flow”) refers to a water flow jetted from spouts of the circular nozzles (including elliptical and polyangular nozzles).
  • the rod-like water flow refers not to a spray jet, but to a continuous, rectilinear water flow whose cross section is maintained in a substantially circular form until the water flow collides with the steel plate or sheet from the spouts of the nozzles.
  • Fig. 1 is a schematic view of a hot rolling line of a thin steel plate or sheet that uses the present invention.
  • Reference numeral 11 denotes a reheating furnace
  • reference numeral 12 denotes a hot rolling mill train comprising a rougher and a finisher
  • reference numeral 13 denotes a run out table.
  • Pieces of top-side cooling equipment 20 for supplying cooling water to the top surface of a steel plate or sheet 10 are installed at the upper portion of the run out table 13 so that they are separated by a predetermined interval in the direction of transferring of the steel plate or sheet 10 (hereafter simply referred to as "transferring direction").
  • Pieces of under-side cooling equipment 30 for supplying cooling water to the under surface of the steel plate or sheet 10 from gaps between table rolls 14 are installed at the lower portion of the run out table 13 so that they are separated by a predetermined interval in the transferring direction.
  • the hot rolling mill train 12 performs roughing and finishing rolling on a slab that is extracted from the reheating furnace 11, to form the slab to a predetermined finishing plate or sheet thickness at a predetermined finishing temperature. Then, the slab is transfered to the run out table 13, and is cooled to a predetermined temperature by cooling water jetted from the pieces of the top-side cooling equipment 20 and the under-side cooling equipment 30.
  • Fig. 2 shows the under-side cooling equipment 30 according to the embodiment of the present invention.
  • Fig. 3 is a plan view showing the disposition of nozzles of the under-side cooling equipment 30.
  • the under-side cooling equipment 30 comprises a header 31, a plurality of protector plates 34, and nozzle trains.
  • the protector plates 34 are disposed on the top surface of the header 31 obliquely with respect to the transferring direction.
  • the nozzle trains are provided on the header 21 obliquely with respect to the transferring direction so that, here, two nozzle trains each are disposed between the protector plates 34 that are adjacent to each other.
  • the nozzle trains have the same number of circular-tube-shaped nozzles 32 (here, one) disposed, respectively, on virtual lines 36 (broken line in Fig. 3 ) drawn at certain pitches in a plate or sheet width direction.
  • each circular-tube-shaped nozzle 32 that jets a rod-like water flow is positioned below the top ends of the protector plates 34, and above a center 14a of a circular cross section of each table roll 14.
  • the header 31 to which the circular-tube-shaped nozzles 32 are mounted is positioned below the center 14a of the circular cross section of each table roll 14.
  • the inside diameter of each circular-tube-shaped nozzle 32 is 3 to 8 mm, and the jet speed is 1 to 10 m/s. It is desirable that the intervals between the protector plates 34 be equal to each other.
  • the circular-tube-shaped nozzles 32 that supply a rod-like water flow 33 to the under surface of the steel plate or sheet 10 are protected by the protector plates 34, even if the steel plate or sheet having a downwardly curved edge enters, damage to the circular-tube-shaped nozzles 32 is prevented from occurring, so that equipment maintainability is good. Therefore, while the circular-tube-shaped nozzles 32 are in a good state, cooling can be performed over a long period of time. Consequently, it is possible to prevent the occurrence of strip temperature deviation of the steel plate or sheet, without, for example, repairing the equipment.
  • the cooling water is smoothly drained from the gaps between the circular-tube-shaped nozzles 32, so that draining property is excellent.
  • the header 31 is positioned below the center 14a of the circular cross section of each table roll 14, the flow of the cooling water is not hindered between the header 31 and the table rolls 14, so that the cooling water is more smoothly drained. Therefore, the cooling water is not retained at the top surface of the header 31, so that spouts at ends of the circular-tube-shaped nozzles 32 are not submerged. Consequently, cooling water having high momentum is always supplied to the under surface of the steel plate or sheet 10, so that efficient cooling can be performed.
  • the ends of the circular-tube-shaped nozzles 32 are positioned above the center 14a of the circular cross section of each table roll 14 because, if the ends of the circular-tube-shaped nozzles 32 are separated too much from the under surface of the steel plate or sheet 10, a high jet pressure for supplying cooling water having high momentum to the under surface of the steel plate or sheet 10 is required due to the influence of falling cooling water.
  • the inside diameter of the circular-tube-shaped nozzles 32 is 3 to 8 mm due to the following reasons. If the inside diameter is less than 3 mm, nozzle clogging may frequently occur. In addition, since the jet flow is thin, the cooling water may not be capable of reaching the under surface of the steel plate or sheet 10 due to the interference of falling cooling water. Therefore, cooling performance is reduced. In contrast, if the inside diameter is greater than 8 mm, it is necessary to restrict the jet speed to a certain low value as a result of increasing the interval between the nozzles. Therefore, strip temperature deviation in the steel plate or sheet width direction is increased, and cooling performance is also reduced.
  • the jet speed from the circular-tube-shaped nozzles 32 is set from 1 to 10 m/s for the following reasons. If the jet speed is less than 1 m/s, the momentum with which the cooling water strikes the steel plate or sheet 10 is low, as a result of which cooling is not sufficiently performed. In contrast, if the jet speed is greater than 10 m/s, an extremely high fountain results, thereby causing the cooling water to fly to places surrounding the equipment.
  • the top-side cooling equipment 20 uses related cooling equipment including, for example, circular-tube-shaped nozzles.
  • the steel plate or sheet 10 is cooled at the run out table 13 using the above-described under-surface cooling equipment 30, equipment maintainability and draining property are excellent, and efficient cooling is performed uniformly in the widthwise direction to achieve high cooling speed. Therefore, the steel plate or sheet having high quality can be manufactured.
  • the circular-tube-shaped nozzles 32 are used for the nozzles of the under-side cooling equipment 30, other tube-shaped nozzles, such as rectangular-tube-shaped nozzles, may also be used.
  • the disposition of the protector plates 34 and the circular-tube-shaped nozzles 32 is not limited to that shown in Fig. 3 .
  • three nozzle trains each may be disposed between the protector plates 34 that are adjacent to each other, with one circular-tube-shaped nozzle 32 being disposed on respective virtual lines.
  • the nozzle trains may be divided in two in the transferring direction, and a protector plate 35 may be disposed between the divided rows in the steel plate or sheet width direction.
  • the present invention may be used not only in a hot rolling line of a thin steel plate or sheet, but also in a hot rolling line of a thick steel plate.
  • a steel sheet was cooled at the run out table 13 in the hot rolling line of the thin steel sheet schematically shown in Fig. 1 .
  • the finishing temperature was 880°C
  • the finishing sheet thickness was 4 mm
  • the cooling was performed at the run out table 13 up to a temperature of 550°C.
  • a rod-like water flow was supplied to the under surface of the steel sheet 10 using the cooling equipment 50 discussed in Japanese Unexamined Patent Application Publication No. 62-259610 in which the header 51, which also serves as an apron, is installed between the table rolls 14.
  • the current density of the cooling water supplied to the under surface of the steel sheet was 2 m 3 /m 2 min, and the distance between the nozzle spouts and the under surface of the steel sheet was 150 mm.
  • a rod-like water flow having a current density of 1 m 3 /m 2 min was supplied to the top surface of the steel sheet 10 using a related technology.
  • the cooling water after being supplied to the under surface of the steel sheet 10 was drained from only the narrow gaps between the header 31 and the table rolls 32, the cooling water accumulated on the header (apron) 31, thereby forming the water film (or puddle) 54.
  • the cooling water 53 jetted from the spouts of the nozzles 52 reached the under surface of the steel sheet 10 after its momentum was reduced by the water film (or puddle) 54. Therefore, efficient cooling was not performed, and the cooling speed resulting from combination of the cooling at the under surface and the cooling at the top surface was low at 20°C/s.
  • the water film (or puddle) 54 was not formed when an edge of the steel sheet 10 passed. It was formed some time after the passage of the edge. Therefore, only the edge of the steel sheet 10 was cooled well, and the temperature difference between edge parts and steady parts that are cooled after the formation of the water film (or puddle) 54 was as high as 30°C.
  • the steel sheet (difference between its maximum strength and minimum strength: at least 3 kgf/mm 2 ) having a large deviation of mechanical properties, such as tensile strength, was manufactured.
  • the cooling water was smoothly drained from the gaps between the circular-tube-shaped nozzles 32, and the flow between the header 31 and each table roll 14 was not hindered. Therefore, the cooling water was not retained at the top surface of the header 31, so that the spouts at the ends of the circular-tube-shaped nozzles 32 were not submerged. Consequently, the rod-like water flow 33 having momentum was always supplied to the under surface of the steel sheet 10.
  • the strip temperature deviations in the longitudinal direction and the widthwise direction of the steel plate or sheet could be reduced to a very small value. Therefore, the deviation of mechanical properties, such as tensile strength, could be reduced (difference between maximum strength and minimum strength: 1 kgf/mm 2 or less), so that the steel plate or sheet having high quality could be produced.

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

Claims (4)

  1. Linie zum Warmwalzen einer Stahlplatte oder -blechs (10), die Linie mit einer Gangrolle (14) und einer Kühleinrichtung (20,30), die Kühleinrichtung (20,30) mit:
    mehreren Schutzplatten (34), die unterhalb der Stahlplatte oder des -blechs (10), die/das verfahren wird, und schräg bezüglich einer Verfahrrichtung der Stahlplatte oder des -blechs (10) vorgesehen sind, und
    Düsenanordnungen (32), die zwischen den Schutzplatten (34) und schräg bezüglich der Verfahrrichtung der Stahlplatte oder des -blechs (10) vorgesehen sind, um Kühlwasser zu der unteren Oberfläche der Stahlplatte oder des -blechs (10) zuzuführen,
    wobei die Düsenanordnungen (32) die gleiche Anzahl an röhrenförmigen Düsen jeweils auf virtuellen Linien (36) vorgesehen hat, die mit bestimmten Abständen in einer Stahplatten oder -blech-Breitenrichtung der Stahlplatte oder des Blechs (10) gezogen sind,
    wobei die oberen Enden der röhrenförmigen Düsen unterhalb der oberen Enden der Schutzplatten (34) vorgesehen sind,
    dadurch kennzeichnet, dass ein Kopfteil (31), an dem die röhrenförmigen Düsen vorgesehen sind, unterhalb einer Mitte eines kreisförmigen Querschnitts der Gangrolle (14) positioniert ist,
    wobei das obere Ende jeder röhrenförmigen Düse unterhalb der Mitte des kreisförmigen Querschnitts der Gangrolle (14) ist, welche die Stahlplatte oder das -blech (10) transportiert, und
    wobei die röhrenförmigen Düsen kreisförmig röhrenförmige Düsen sind, der Innendurchmesser der Düsen 3 bis 8 mm ist und bei Verwendung die Strahlgeschwindigkeit 1 bis 10 m/s ist und die Düsen einen stabähnlichen Wasserfluss zuführen, der kontinuierlich und geradlinig ist und der einen Querschnitt hat, der in einer im Wesentlichen kreisförmigen Gestalt beibehalten wird, bis der Wasserfluss auf die Stahlplatte oder das -blech (10) auftrifft.
  2. Linie zum Warmwalzen einer Stahlplatte oder eines -blechs (10) nach Anspruch 1, bei der die Düsenanordnungen (32) in zwei Teile in der Verfahrrichtung aufgeteilt sind und eine Schutzplatte (35) zwischen den geteilten Reihen in der Breitenrichtung der Stahlplatte oder des -blechs vorgesehen ist.
  3. Verfahren zum Herstellen einer Stahlplatte oder eines - blechs (10), welches die Stahlplatte oder das -blech (10) in einer Warmwalzlinie der Stahlplatte oder des -blechs (10) herstellt, das Verfahren mit:
    dem Vorsehen mehrerer Schutzplatten (34) unterhalb der Stahlplatte oder des -blechs (10), die/das verfahren wird, und schräg bezüglich einer Verfahrrichtung der Stahlplatte oder des -blechs (10), und
    dem Bereitstellen von Düsenanordnungen (32) zwischen den Schutzplatten (34) und schräg bezüglich einer Verfahrrichtung der Stahlplatte oder des -blechs (10), zum Zuführen von Kühlwasser zur unteren Oberfläche der Stahlplatte oder des - blechs (10),
    wobei die Düsenanordnungen (32) die gleiche Anzahl an röhrenförmigen Düsen jeweils auf virtuellen Linien (36) vorgesehen haben, die mit bestimmten Abständen in einer Platten oder Blech (10)-Breitenrichtung der Stahlplatte oder des -blechs (10) gezogen sind,
    wobei die oberen Enden der röhrenförmigen Düsen unterhalb der oberen Enden der Schutzplatten (34) positioniert sind,
    dadurch gekennzeichnet, dass ein Kopfteil (31), an dem die röhrenförmigen Düsen angebracht sind, unterhalb einer Mitte eines kreisförmigen Querschnitts der Gangrolle (40) positioniert ist,
    wobei das obere Ende jeder röhrenförmigen Düse oberhalb der Mitte des kreisförmigen Querschnitts der Gangrolle (14) positioniert ist, welche die Stahlplatte oder das -blech (10) verfährt, und
    wobei die röhrenförmigen Düsen kreisförmig röhrenförmige Düsen sind, die Innendurchmesser der Düsen 3 bis 8 mm sind, die Strahlgeschwindigkeit 1 bis 10 m/s ist und die Düsen einen stabähnlichen Wasserfluss zuführen, der kontinuierlich und geradlinig ist und einen Querschnitt hat, der in einer im wesentlichen kreisförmigen Gestalt beibehalten wird, bis der Wasserfluss auf die Stahlplatte oder das -blech (10) auftrifft.
  4. Verfahren zum Herstellen einer Stahlplatte oder eines - blechs (10) nach Anspruch 3, bei dem die Düsenanordnungen (32) in zwei Teile in der Verfahrrichtung aufgeteilt sind und eine Schutzplatte (35) zwischen den
    aufgeteilten Reihen in der Stahlplatten oder -blech-(10)-Breitenrichtung vorgesehen ist.
EP06783171.9A 2005-09-27 2006-08-29 Linie und verfahren zum warmen rollen von stahl platte oder blech mit besonderer anordnung einer kühlanlage Active EP1930092B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005278997A JP4774887B2 (ja) 2005-09-27 2005-09-27 鋼板の冷却設備および製造方法
PCT/JP2006/317399 WO2007037095A1 (ja) 2005-09-27 2006-08-29 鋼板の冷却設備および製造方法

Publications (3)

Publication Number Publication Date
EP1930092A1 EP1930092A1 (de) 2008-06-11
EP1930092A4 EP1930092A4 (de) 2011-12-07
EP1930092B1 true EP1930092B1 (de) 2015-08-12

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Country Status (5)

Country Link
EP (1) EP1930092B1 (de)
JP (1) JP4774887B2 (de)
KR (1) KR100935357B1 (de)
CN (1) CN101253010B (de)
WO (1) WO2007037095A1 (de)

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KR101337714B1 (ko) * 2009-06-30 2013-12-06 신닛테츠스미킨 카부시키카이샤 강판의 냉각 장치, 열연 강판의 제조 장치 및 제조 방법
CN102759935A (zh) * 2011-04-25 2012-10-31 蔺桃 一种新型冷却控制方法
CN103447315B (zh) * 2012-05-31 2015-10-28 宝山钢铁股份有限公司 一种基于板形的acc流量控制方法及装置
EP2783766A1 (de) 2013-03-25 2014-10-01 Siemens VAI Metals Technologies GmbH Kühlstrecke mit unterem Spritzbalken
KR101326031B1 (ko) 2013-06-18 2013-11-07 한국기계연구원 스월을 형성하는 노즐 모듈
CN103935679B (zh) * 2014-04-30 2016-08-17 嘉兴鸿利机械有限公司 输送装置
CN105855305B (zh) * 2016-05-26 2018-06-15 钢研晟华科技股份有限公司 机架间冷却装备和热心轧制工艺
CN107447089B (zh) * 2016-05-31 2019-06-25 宝山钢铁股份有限公司 一种喷嘴可连续均匀高密度布置的冷却喷箱
CN114472548B (zh) * 2020-10-23 2024-06-04 宝山钢铁股份有限公司 一种减小超长板轧制过程中头尾温差的系统及方法

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KR20080034967A (ko) 2008-04-22
JP2007090355A (ja) 2007-04-12
EP1930092A4 (de) 2011-12-07
CN101253010B (zh) 2010-06-16
KR100935357B1 (ko) 2010-01-06
JP4774887B2 (ja) 2011-09-14
WO2007037095A1 (ja) 2007-04-05
CN101253010A (zh) 2008-08-27
EP1930092A1 (de) 2008-06-11

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