EP2979770A1 - 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
EP2979770A1
EP2979770A1 EP14775597.9A EP14775597A EP2979770A1 EP 2979770 A1 EP2979770 A1 EP 2979770A1 EP 14775597 A EP14775597 A EP 14775597A EP 2979770 A1 EP2979770 A1 EP 2979770A1
Authority
EP
European Patent Office
Prior art keywords
steel plate
cooling
descaling
cooling water
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14775597.9A
Other languages
German (de)
English (en)
Other versions
EP2979770A4 (fr
EP2979770B1 (fr
Inventor
Yuta TAMURA
Hiroyuki Fukuda
Kenji Adachi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP2979770A1 publication Critical patent/EP2979770A1/fr
Publication of EP2979770A4 publication Critical patent/EP2979770A4/fr
Application granted granted Critical
Publication of EP2979770B1 publication Critical patent/EP2979770B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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.
  • 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.
  • 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 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.
  • a jetting distance H preferably is less than or equal to 200 mm.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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 ratio between the total cross sectional area of the water drainage ports and the total cross sectional area of the inside diameters of the circular tube nozzles 13 be in the range of from 1.5 to 20.
  • 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 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.

Landscapes

  • 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)
EP14775597.9A 2013-03-27 2014-03-20 Dispositif et procédé de fabrication d'une tôle d'acier épaisse Active EP2979770B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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

Publications (3)

Publication Number Publication Date
EP2979770A1 true EP2979770A1 (fr) 2016-02-03
EP2979770A4 EP2979770A4 (fr) 2016-03-16
EP2979770B1 EP2979770B1 (fr) 2018-08-22

Family

ID=51623100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14775597.9A Active EP2979770B1 (fr) 2013-03-27 2014-03-20 Dispositif et procédé de fabrication d'une tôle d'acier épaisse

Country Status (6)

Country Link
EP (1) EP2979770B1 (fr)
JP (1) JP5962849B2 (fr)
KR (1) KR101742607B1 (fr)
CN (1) CN105102142B (fr)
TW (1) TWI565541B (fr)
WO (1) WO2014156086A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6377550B2 (ja) * 2015-03-06 2018-08-22 株式会社神戸製鋼所 厚鋼板冷却方法及び厚鋼板冷却装置
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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0238283B2 (ja) * 1983-02-09 1990-08-29 Mitsubishi Heavy Ind Ltd Kohanreikyakusochi
JPH0957327A (ja) 1995-08-22 1997-03-04 Sumitomo Metal Ind Ltd 厚鋼板のスケール除去方法
JPH10113713A (ja) * 1996-10-09 1998-05-06 Kobe Steel Ltd 制御冷却鋼板の製造方法
JP2000015323A (ja) * 1998-06-30 2000-01-18 Sumitomo Metal Ind Ltd 表面性状の良好な熱延鋼板の製造方法
JP3872609B2 (ja) * 1999-03-10 2007-01-24 新日本製鐵株式会社 高Ｓｉ鋼の熱間圧延方法
JP3994582B2 (ja) * 1999-06-29 2007-10-24 住友金属工業株式会社 鋼板のデスケーリング方法
JP3796133B2 (ja) 2000-04-18 2006-07-12 新日本製鐵株式会社 厚鋼板冷却方法およびその装置
KR100496607B1 (ko) * 2000-12-27 2005-06-22 주식회사 포스코 열연코일의 제조방법 및 그 장치
JP2003181522A (ja) * 2001-12-14 2003-07-02 Nippon Steel Corp 表面性状の優れた鋼板の製造方法及びその装置
JP5614040B2 (ja) * 2009-03-25 2014-10-29 Ｊｆｅスチール株式会社 厚鋼板の製造設備及び製造方法
CN202061902U (zh) * 2011-01-22 2011-12-07 马鞍山钢铁股份有限公司 冷轧用热轧钢板氧化铁皮清除装置

Also Published As

Publication number Publication date
JP5962849B2 (ja) 2016-08-03
TWI565541B (zh) 2017-01-11
EP2979770A4 (fr) 2016-03-16
KR20150138269A (ko) 2015-12-09
JPWO2014156086A1 (ja) 2017-02-16
EP2979770B1 (fr) 2018-08-22
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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