US20050016643A1 - Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill - Google Patents

Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill Download PDF

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Publication number
US20050016643A1
US20050016643A1 US10/498,652 US49865204A US2005016643A1 US 20050016643 A1 US20050016643 A1 US 20050016643A1 US 49865204 A US49865204 A US 49865204A US 2005016643 A1 US2005016643 A1 US 2005016643A1
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US
United States
Prior art keywords
cooling
strip
sheet
tensile stress
metal strip
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.)
Abandoned
Application number
US10/498,652
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English (en)
Inventor
Andreas Mathies
Dirk Schmidt
Gerhard Horn
Roman Dehmel
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.)
SMS Siemag AG
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Individual
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 Individual filed Critical Individual
Assigned to SMS DEMAG AG reassignment SMS DEMAG AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DEHMEL, ROMAN, HORN, GERHARD, SCHMIDT, DIRK, MATHIES, ANDREAS
Publication of US20050016643A1 publication Critical patent/US20050016643A1/en
Priority to US13/270,842 priority Critical patent/US20120024435A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0242—Flattening; Dressing; Flexing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0252—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with application of tension
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling

Definitions

  • the invention concerns a method and device for controlled straightening and cooling of wide metal strip, especially steel strip or sheet, running out of a hot-rolled strip mill, with the use of pinch rolls, which are installed after (in the direction of strip flow) vertical double rolls and produce a tensile stress that acts in the longitudinal direction.
  • DE 33 13 024 A1 discloses a method and a device for quenching passing steel sheet, especially heavy and medium sheet, with simultaneous controlled straightening, in which the sheet, before being quenched, is straightened in a plane while hot by at least two vertical double-rolls arranged one behind the other. The sheet is then drawn through a quenching installation under controlled tensile stress by at least one double roll.
  • This method is designed to quench passing steel sheet exactly to the predetermined mechanical properties without the development of warpage or distortion and at the same to reduce roughness that is already present. Despite these measures, inadequate flatness of the sheet continues to occur due to inadequate application of tensile stress, unfavorable cooling, and other unfavorable control measures.
  • the cooling devices used in practice which consist essentially of nozzle units or, for the aftercooling, of laminar water curtains, cannot really be improved any further.
  • a U-tube is used for laminar cooling units.
  • the highest attainable cooling intensities are obtained with nozzles and suitably selected parameters.
  • the poor automatic control and regulation behavior is a disadvantage in general and at low flow rates in particular.
  • the objective of the invention is to extend the range of application of conventional sheet cooling systems to obtain greater flatness of the sheet with an increased cooling effect.
  • this objective is achieved by moving the metal strip or sheet between a pre-straightening machine and a splash cooling installation under defined conditions of tensile stress by adjustment of the tensile stress and by cooling the metal strip or sheet inside the splash cooling installation between successive pairs of pinch rolls and additionally controlling the tensile stress.
  • This directly produces plastic deformation before the metal strip or sheet passes into the cooling installation.
  • the plastic deformation improves the flatness of the entering metal strip or sheet.
  • Another advantage is gained by the arrangement of the straightening process immediately before the cooling, which prevents renewed buildup of internal stresses and deformations due to the nonuniform cooling on the surface of the metal strip or sheet.
  • the cooling effect is practically limited by the induction of stresses and deformations associated with these stresses in the sheet due to the nonuniform cooling effect of the cooling medium (water) on the surface of the sheet.
  • This (unfavorable) effect occurs especially with the use of a relatively high cooling intensity on sheets that are thin and at the same time wide.
  • the critical product of a plant is defined by a sheet with the least thickness at the maximum width and at the same time high intensity of the cooling.
  • the intensity of the cooling is defined by a high temperature difference between the initial and final cooling temperature using a short cooling time. In practice, pinch rolls are intended to hinder this deformation effect. However, the effect of this form of compensation is limited.
  • the arrangement of the pre-straightening machine before the cooling installation in accordance with the invention brings about plastic deformation and reduces entry deformations and stresses directly before the cooling installation.
  • the deformations on entry into the cooling installation can be combated especially effectively by adjusting the tensile stress by switching the speed to the respective next or last supporting pinch roll with progressive passage of the metal strip or sheet.
  • the pinch rolls are set with a spacing such that a cooling unit is formed between two rolls, depending on the spacing.
  • this spacing can be adjusted to a half-length of the resulting characteristic form for a strip or sheet with the least thickness, at maximum width and high cooling intensity.
  • the device for the controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet, running out of a hot-rolled strip mill is equipped with vertical pairs of double rolls and pairs of pinch rolls which follow them (in the direction of strip flow), between each of which a cooling unit is installed.
  • the stated objective is achieved with a device of this type by installing a pre-straightening machine before the pairs of pinch rolls with the cooling units, between which a controlled tensile stress can be produced. This makes it possible to transmit a tensile force even before the cooling, so that the magnitude of the deformations that are present is already reduced here. An even more exact determination of the tensile stresses inside the cooling units then occurs.
  • the cooling units are each designed for a high and an intermediate cooling intensity.
  • the effect of the cooling can be increased still further by providing the cooling unit with finely adjustable cooling elements at the outlet of the metal strip.
  • the cooling can be further developed in such a way that the cooling unit is designed for a high and/or an intermediate cooling intensity in accordance with a predetermined product spectrum.
  • the invention can be further improved by also making it possible to produce tensile stresses between the last, supporting pinch rolls or the straightening rolls at the trailing end of the metal strip or sheet and the pinch rolls or the straightening rolls at the leading end of the metal strip or sheet.
  • FIG. 1 shows a system diagram of the cooling with pinch rolls and of the drive control with the tensile stresses produced.
  • FIG. 2A shows a perspective view of the steel strip or sheet with distortions in the form of center waviness.
  • FIG. 2B shows a side view of two pairs of pinch rolls arranged with a certain spacing distance.
  • FIG. 3 shows the arrangement of the cooling devices for the given cooling intensity.
  • FIG. 4 shows a view of a total installation for straightening and cooling.
  • the metal strip is conveyed by a tensile stress 6 acting in the longitudinal direction (strip flow direction 2 ) for controlled cooling and straightening with the use of pinch rolls 5 arranged after (in the direction of strip flow 2 ) vertical, double rolls 3 and 4 .
  • the metal strip 1 is moved between a pre-straightening machine 7 and a splash cooling installation 8 under defined conditions of tensile stress 6 by adjustment of the tensile stress (by the straightening roll rotational drive motors).
  • the metal strip 1 is then cooled inside the splash cooling installation between successive pairs of pinch rolls 5 a , and the tensile stress is additionally controlled.
  • the splash cooling installation 8 comprises cooling units 9 installed between each two pairs of pinch rolls 5 a .
  • the tensile stress 6 is controlled via a suitable torque 11 by a feedback control system 12 , which is designated (A) action of the pinch rolls 5 (i) to (i+nc). As soon as the trailing end 1 a of the strip passes through, which is designated (B) action of the pinch rolls 5 (i) to (i+nc), suitable tensile stress is transmitted to the trailing end 1 a of the strip, and only the comparison speed is still measured beyond the end 1 a of the strip without using the feedback control system 12 . Both for the trailing end 1 a of the strip and the leading end 1 b of the strip, the tensile stress 6 is adjusted by switching the speed to the respective next or last supporting pinch roll 5 with progressive passage of the metal strip (see FIG. 1 ).
  • the pinch rolls 5 are installed with a certain spacing 13 , such that the cooling unit 9 is formed between two pinch rolls 5 , depending on the spacing 13 .
  • the spacing 13 can be based on a half-length 14 of the resulting wavelength 15 for a metal strip with the least thickness, at maximum width and high cooling intensity.
  • the typical wavelength 15 develops in the steel strip 11 ( FIG. 2A ).
  • the cooling units are each designed for a high or an intermediate cooling intensity ( FIG. 2B ), such that the spacing 13 corresponds to the half wavelength 15 (cf. FIG. 2B ).
  • the behavior of the wave 16 is clearly shown by the dotted lines 17 in FIGS. 2A and 2B .
  • FIG. 3 shows the cooling effect of the different individual types of cooling devices 9 .
  • the solid curve represents the behavior of the temperature 20 in the center of the strip or sheet, and the broken curve represents the surface temperature 21 .
  • Splash cooling units 8 a are used in the sections ( 1 ).
  • Cooling units 9 which consist of U-tube units 22 , are provided at the outlet 18 of the steel strip 1 .
  • the temperature ⁇ T-surface is reached while still in the zone of the splash cooling units 8 a .
  • the necessary cooling stop temperature is attained in small increments by the U-tube units 22 . Martensite formation by surface subcooling is prevented above the temperature T-martensite.
  • Tensile stresses 6 can be produced in the same procedure between the last supporting pinch rolls 5 or straightening rolls 23 at the trailing end 1 a of the metal strip 1 or sheet and the pinch rolls 5 or the straightening rolls 24 at the leading end 1 b of the metal strip 1 .
  • FIG. 4 shows a complete installation, in which, in the direction of strip flow 2 , the pre-straightening machine 7 is followed by the splash cooling installation 8 with the pairs of pinch rolls 5 a and the cooling units 9 and then by a laminar cooling installation 25 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Rolling (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US10/498,652 2001-12-20 2002-11-21 Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill Abandoned US20050016643A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/270,842 US20120024435A1 (en) 2001-12-20 2011-10-11 Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10163070A DE10163070A1 (de) 2001-12-20 2001-12-20 Verfahren und Einrichtung zum kontrollierten Richten und Kühlen von aus einem Warmband-Walzwerk auslaufendem breiten Metallband, insbesondere von Stahlband oder Blech
DE10163070.0 2001-12-20
PCT/EP2002/013035 WO2003054236A1 (de) 2001-12-20 2002-11-21 Verfahren und einrichtung zum kontrollierten richten und kühlen von aus einem warmband-walzwerk auslaufendem breitem metallband, insbesondere von stahlband oder blech

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/270,842 Continuation US20120024435A1 (en) 2001-12-20 2011-10-11 Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill

Publications (1)

Publication Number Publication Date
US20050016643A1 true US20050016643A1 (en) 2005-01-27

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US10/498,652 Abandoned US20050016643A1 (en) 2001-12-20 2002-11-21 Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill
US13/270,842 Abandoned US20120024435A1 (en) 2001-12-20 2011-10-11 Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill

Family Applications After (1)

Application Number Title Priority Date Filing Date
US13/270,842 Abandoned US20120024435A1 (en) 2001-12-20 2011-10-11 Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill

Country Status (13)

Country Link
US (2) US20050016643A1 (ja)
EP (1) EP1456421B1 (ja)
JP (1) JP4440643B2 (ja)
CN (1) CN100402672C (ja)
AT (1) ATE328123T1 (ja)
AU (1) AU2002350708A1 (ja)
BR (1) BR0214598A (ja)
CA (1) CA2469073C (ja)
DE (2) DE10163070A1 (ja)
ES (1) ES2261757T3 (ja)
RU (1) RU2307718C2 (ja)
UA (1) UA77241C2 (ja)
WO (1) WO2003054236A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9822422B2 (en) 2009-09-24 2017-11-21 Ati Properties Llc Processes for reducing flatness deviations in alloy articles
CN114959201A (zh) * 2022-06-27 2022-08-30 江西省科学院应用物理研究所 一种金属材料分级退火冷却装置
CN117621423A (zh) * 2023-11-07 2024-03-01 东莞市首誉电子材料有限公司 一种屏幕光学膜片的制备控制方法、装置、设备及介质

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JP4315951B2 (ja) * 2005-12-26 2009-08-19 株式会社神戸製鋼所 溶接用鋼板
JP2011042814A (ja) * 2009-08-19 2011-03-03 Chugai Ro Co Ltd 金属ストリップの冷却装置及び冷却方法
WO2011042934A1 (ja) 2009-10-07 2011-04-14 新日本製鐵株式会社 熱延の冷却装置及び冷却方法
EP2353742A1 (de) * 2010-02-05 2011-08-10 Siemens Aktiengesellschaft Warmwalzstraße zum Walzen von Warmband, Verfahren zum Betrieb einer Warmwalzstraße zum Walzen von Warmband, Steuer- und/oder Regeleinrichtung
EP2361699A1 (de) * 2010-02-26 2011-08-31 Siemens Aktiengesellschaft Verfahren zur Kühlung eines Blechs mittels einer Kühlstrecke, Kühlstrecke und Steuer- und/oder Regeleinrichtung für eine Kühlstrecke
CN101993995B (zh) * 2010-11-26 2012-05-30 首钢总公司 超高强度带钢水淬冷却方法及装置
RU2463122C2 (ru) * 2010-12-16 2012-10-10 Валерий Никитич Гринавцев Способ правки полосы
RU2456109C1 (ru) * 2010-12-16 2012-07-20 Валерий Никитич Гринавцев Машина правки полосы
RU2474623C1 (ru) * 2011-10-31 2013-02-10 Валентин Николаевич Никитин Способ производства высокопрочной листовой стали мартенситного класса и деформационно-термический комплекс для его осуществления
KR101376565B1 (ko) * 2011-12-15 2014-04-02 (주)포스코 연속 소둔라인 급냉대의 스트립 온도제어 방법 및 장치
DE102012110010B4 (de) * 2012-10-19 2016-09-01 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Vorrichtung und Verfahren zur kontinuierlichen Behandlung eines Metallbandes
CN105483343B (zh) * 2014-09-17 2017-06-23 宝山钢铁股份有限公司 用于改善钢板平直度的中厚板轧制生产线速度控制方法
CN104451117A (zh) * 2014-09-23 2015-03-25 中冶赛迪工程技术股份有限公司 一种淬火板板形控制方法和装置
DE102017118244A1 (de) * 2017-08-10 2019-02-14 Thyssenkrupp Ag Vorrichtung und Verfahren zur Herstellung eines Warmbands
DE102017127470A1 (de) * 2017-11-21 2019-05-23 Sms Group Gmbh Kühlbalken und Kühlprozess mit variabler Abkühlrate für Stahlbleche

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US7052647B2 (en) * 2000-03-01 2006-05-30 Jfe Steel Corporation Method and apparatus for cooling hot rolled steel strip, and method for manufacturing hot rolled steel strip

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9822422B2 (en) 2009-09-24 2017-11-21 Ati Properties Llc Processes for reducing flatness deviations in alloy articles
US10260120B2 (en) 2009-09-24 2019-04-16 Ati Properties Llc Processes for reducing flatness deviations in alloy articles
CN114959201A (zh) * 2022-06-27 2022-08-30 江西省科学院应用物理研究所 一种金属材料分级退火冷却装置
CN117621423A (zh) * 2023-11-07 2024-03-01 东莞市首誉电子材料有限公司 一种屏幕光学膜片的制备控制方法、装置、设备及介质

Also Published As

Publication number Publication date
CN100402672C (zh) 2008-07-16
WO2003054236A1 (de) 2003-07-03
JP4440643B2 (ja) 2010-03-24
RU2004122098A (ru) 2005-03-27
JP2005512816A (ja) 2005-05-12
EP1456421A1 (de) 2004-09-15
DE50207037D1 (de) 2006-07-06
DE10163070A1 (de) 2003-07-03
CA2469073A1 (en) 2003-07-03
EP1456421B1 (de) 2006-05-31
ES2261757T3 (es) 2006-11-16
ATE328123T1 (de) 2006-06-15
CN1606630A (zh) 2005-04-13
CA2469073C (en) 2011-10-11
RU2307718C2 (ru) 2007-10-10
UA77241C2 (en) 2006-11-15
US20120024435A1 (en) 2012-02-02
BR0214598A (pt) 2004-11-03
AU2002350708A1 (en) 2003-07-09

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Owner name: SMS DEMAG AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MATHIES, ANDREAS;SCHMIDT, DIRK;HORN, GERHARD;AND OTHERS;REEL/FRAME:015876/0769;SIGNING DATES FROM 20040522 TO 20040601

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION