EP1108795B1 - Verfahren und Vorrichtung zum Vermeiden von Falten in einem Band in der Schnellkühlstrecke einer Wärmebehandlungsanlage - Google Patents

Verfahren und Vorrichtung zum Vermeiden von Falten in einem Band in der Schnellkühlstrecke einer Wärmebehandlungsanlage Download PDF

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Publication number
EP1108795B1
EP1108795B1 EP00403318A EP00403318A EP1108795B1 EP 1108795 B1 EP1108795 B1 EP 1108795B1 EP 00403318 A EP00403318 A EP 00403318A EP 00403318 A EP00403318 A EP 00403318A EP 1108795 B1 EP1108795 B1 EP 1108795B1
Authority
EP
European Patent Office
Prior art keywords
cooling
strip
box
progressive
variation
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.)
Expired - Lifetime
Application number
EP00403318A
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English (en)
French (fr)
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EP1108795A1 (de
Inventor
Catherine Pasquinet
Xavier Cluzel
Akli Elias
Jérome Muller
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.)
USINOR SA
Fives Stein SA
Original Assignee
Stein Heurtey SA
USINOR SA
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Publication date
Application filed by Stein Heurtey SA, USINOR SA filed Critical Stein Heurtey SA
Publication of EP1108795A1 publication Critical patent/EP1108795A1/de
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material

Definitions

  • the present invention relates to improvements made to the chambers rapid cooling of heat treatment lines of strips metal.
  • it proposes to reduce the training of folds that form on metal strips subjected to cooling in continuous heat treatment lines, in which said bands pass through cooling zones equipped with means for blowing a cooling gas.
  • FIG. schematic in perspective and partial tearing off the cooling zone of a metal strip in a heat treatment line.
  • the band 1 passes through the cooling zone fast 2 passing on an input roller 3 and an exit roller 10.
  • the band 1 is exposed to jets of gas from cooling blown by a number of pairs of boxes such as 4 and 5 and 6 and 7, each provided with blowing means, each box being positioned on both sides of the band.
  • Cooling boxes such 4 and 5 and 6 and 7, have a limited length so as to allow the implantation of one or more rollers or pairs of stabilizing rollers such as rollers 8 and 9, between two consecutive boxes such as 4 and 6 and 5 and 7, respectively, these well-known rolls being intended to guide and stabilize the band 1.
  • the blowing of the cooling gas on the belt is ensured by all conventional means such as those described in particular in US-A-3,068,586.
  • FIG. 1A In the graph illustrated by FIG. 1A, associated with FIG. 1, there is shown the intensity ⁇ of the cooling undergone by the band 1 during its crossing of the zone 2.
  • the strip When entering between the first cooling boxes 4 and 5, the strip is exposed suddenly to a large cooling flow of which the intensity remains constant over the entire length of the cooling box, then this intensity decreases suddenly at the output of said boxes.
  • This variation of the intensity of the cooling undergone by the band is renewed during of its passage between each subsequent pair of cooling chambers along the entire length of Area 2 as clearly seen on the Figure 1A.
  • the intensity of the cooling of the strip over the length of a box depends the temperature of the blast gas, characteristics geometries of the blow-out openings of the caissons and the distance of these holes relative to the band.
  • FIG. 2 of the accompanying drawings illustrates such a type of cycle of cooling for which, for example, the strip is cooled according to slopes A-B, C-D and E-F, at least one of these slopes being greater than cooling slopes characteristic of the prior art.
  • sections B-C and D-E correspond to the discontinuities of the cooling related to interruptions of the blow boxes for the purpose of in place stabilizing rollers such as rollers 8 and 9 shown on Figure 1.
  • the current invention has set itself the goal of solving this problem by bringing a solution that limits the formation of folds in the band during fast cooling while maintaining the rated speed of the band in crossing the rapid cooling zone, that is to say, without loss of production.
  • the cooling of the band under the effect of gas jets blown by the cooling boxes causes a contraction of the material of the band following directions parallel and perpendicular to the direction of scrolling Of the band.
  • the contraction along the tape direction is compensated by the tape tension control device provided with the cooling zone or the line in which this cooling zone is integrated.
  • the contraction is effected in the direction perpendicular to the scrolling of the band generates compressive forces within the material that are directed towards the axis of the band.
  • the intensity of the flow of band cooling is constant and there is no difference important between the compressive forces existing in a section of the band and the one that precedes it in the running direction of this band.
  • the forces of compression in one section of the band may be greater than those existing in the preceding section and which undergoes a cooling of less intensity. This difference is even more important than the variation of cooling slope between these two sections is great, as is the case, for example, at the entrance or exit of a pair of cooling.
  • This figure 3 illustrates the phenomenon described above and shows the evolution temperatures along the length L of the cooling zone as well as the resulting stresses in the material.
  • Curve C1 shows the theoretical evolution of the band during its crossing of the cooling zone
  • curve C2 shows the actual evolution of this temperature with the singularities due to the discontinuity of the linked cooling to the construction constraints of the cooling zone
  • curve C3 shows the evolution of the stress in the material of the band on the length of the cooling zone.
  • this stress peak depends on the temperature of the band and of the variation of the slope of the cooling, that is to say of the variation of cooling rate at the point of curve C2 or at the corresponding point at the moment the strip enters or leaves the cooling zone corresponding to a pair of cooling boxes such as 4 and 5 on the figure 1.
  • folds can take various forms, they can be continuous along the length of the band or discontinuous, they may be parallel to the axis of the band or snake on its width. They can be unique or develop according to the shape of several parallel, discontinuous, linear or regular curve or not.
  • this invention provides a method which is essentially characterized in that is to gradually change the intensity of cooling at each variation of the slope of the cooling cycle, so as to limit the peak of corresponding stress in the material and reduce or eliminate forces compression perpendicular to the tape running direction, which appear at this point between two consecutive sections of the band in causing wrinkles in the latter.
  • FIG. 4A The method according to the invention is illustrated by FIG. 4A, associated with FIG. 4 which partly represents a fast cooling zone 2 of the band 1, according to a view similar to FIG. 1.
  • FIG. 4A shows the modifications the cooling efficiency of the band obtained by the implementation of the process, at the inlet and at the outlet of the cooling boxes 4 and 5. It is obvious to those skilled in the art that the process which is the subject of the present invention can be implemented at any point in the cooling zone where produces a cooling slope variation in the cycle of cooling of the band.
  • the method which is the subject of the invention improves the quality of the finished product, given that the heat treatment performed on the material of the tape did not make him to undergo a contraction likely to induce within it a constraint incompatible with its mechanical characteristics at temperature considered.
  • the method according to the invention can be implemented by any means appropriate to limit abrupt variations in slope of cooling or to ensure a gradual change in cooling between the inlet roll 3 and the first caissons 4 and 5, between two caissons consecutively, between the exit boxes and the roll 10, or at any point in the installation where a variation of the cooling slope occurs.
  • FIGS. 5 to 10 various examples of nonlimiting embodiment of means implementing the method according to the invention.
  • FIGS. 5 to 10 schematically represent the beginning of an area 2 with its first caissons 4 and 5 between which the band 1 to be cooled is subjected to the action of the blast gas jets by the blowing means provided on the boxes.
  • the caissons 4 and 5 are equipped with conventional blowing means consisting of tubes or nozzles 11 placed on the entire surface of the boxes opposite band 1.
  • the caissons 4 and 5 are provided with blowing means 11, the first of which, in the direction of travel of the strip, have a distance blow-band orifice which is larger than those located on the current length boxes to reduce their effectiveness.
  • the distance between the blowing orifice and the strip can be gradually reduced to the current value over the entire length of the box so as to obtain a gradual cooling of the conforming strip to the desired effect.
  • the caissons of 4 and 5 are provided with blowing means 11, the first of which in the direction of advancement of the strip are arranged with a pitch or a mesh larger than those located on the current length of the caissons so to obtain a gradual cooling of the band.
  • the progressiveness of the cooling efficiency of the strip can be obtained also by varying the supply pressure of the blow holes 11 caissons 4 and 5, located near a point of variation of the slope of cooling.
  • this variation of the supply pressure of the blowing ports 11 is carried out using of a splitting of the blow boxes 4 and 5 so that their part each of which is supplied independently by distributors 14 and 15 at a lower pressure than the supply pressure of others respective parts of these boxes which are powered by distributors 16 and 17.
  • the modification of the feed pressure of the various blowing zones of the same box can be made, in a variable way, to by means outside the zone, these means being controlled by the equipment control device and this at any point where is carried out the variation of the cooling intensity.
  • FIG 9 there is shown another embodiment of the invention.
  • deflectors such as 12 which are both sides of the strip and on the lateral faces of the boxes 4 and 5, in the vicinity of the point where the change in the slope of cooling.
  • These deflectors 12 force the cooling gas from blow holes 11 to run parallel to the strip (arrow 13), in a direction opposite to its displacement.
  • the gas is thus channeled cooling between the baffles and the band. With this provision the temperature of the cooling gas rises thus producing progressivity the desired cooling along the length of the deflectors 12.
  • FIG. 10 shows another variant of the device according to the invention intended to limit the discontinuity of cooling between two pairs of consecutive boxes 4.5 and 6.7 between which are positioned stabilizing rollers 8 and 9.
  • the blow-out orifices 11 are located on the caissons 5 and 6 for as long as possible in order to to limit the length of band not subjected to cooling. Thanks to that provision is obtained the desired cooling progressivity.
  • the means which according to the invention make it possible to modify gradually the intensity of the cooling of the band at each variation of the cooling slope, can be located on each zone of the caissons where this variation of slope takes place so as to obtain the progressivity of cooling, at the inlet or the outlet of the caisson or in any intermediate point of this box.
  • the present invention encompasses any device to obtain a progressive cooling of the band in all point of variation of its cooling slope.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Wire Bonding (AREA)

Claims (15)

  1. Verfahren zur Verringerung der Bildung von Welligkeiten in Metallbändern, die in kontinuierlichen Wärmebehandlungsanlagen, in denen diese Bänder durch Kühlzonen transportiert werden, die mit Mitteln zum Einblasen eines Kühlgases versehene Kästen umfassen, einem Abkühlvorgang unterzogen werden, dadurch gekennzeichnet, dass es darin besteht, bei einer Veränderung des Gefälles des Kühlzyklus die Intensität des Abkühlungsvorgangs fortschreitend zu modifizieren.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die fortschreitende Modifizierung der Intensität des Abkühlungsvorgangs erhalten wird, indem die Kühlkapazität an der Verbindungsstelle zweier aufeinander folgender Kühlkästen geregelt wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die fortschreitende Modifizierung der Intensität des Abkühlungsvorgangs erhalten wird, indem die Kühlkapazität zwischen der Eingangsrolle der Kühlzone und deren ersten Kühlkasten geregelt wird.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die fortschreitende Modifizierung der Intensität des Abkühlungsvorgangs erhalten wird, indem die Kühlkapazität zwischen dem letzten Kühlkasten und der Ausgangsrolle der Kühlzone geregelt wird.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Intensität des Abkühlungsvorgangs zwischen zwei oder mehreren Blaszonen ein und desselben Kastens fortschreitend modifiziert wird, indem der Betriebsdruck des Kühlgases verändert wird.
  6. Vorrichtung für die Durchführung des Verfahrens nach Anspruch 1, die eine Kühlzone (2) umfasst, durch welche sich ein Band (1) vorwärtsbewegt, wobei es über eine Eingangsrolle (3) und eine Ausgangsrolle (10) läuft und Kühlgasstrahlen ausgesetzt wird, die von einer Vielzahl von Kastenpaaren (4, 5; 6, 7) aufgeblasen werden, wobei sich auf jeder Seite des Bandes je ein Kasten befindet, dadurch gekennzeichnet, dass sie Mittel enthält, die bei einer Veränderung des Abkühlungsgefälles des Kühlzyklus eine fortschreitende Abkühlung des Bandes (1) bewirken und an der Verbindungsstelle zweier aufeinander folgender Kühlkastenpaare zwischen Eingangsrolle (3) und erstem Kühlkasten-paar (4, 5) und zwischen letztem Kühlkastenpaar und der Ausgangsrolle (10) vorgesehen sind.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Mittel, die eine variierbare Veränderung des Betriebsdrucks der verschiedenen Blaszonen ein und desselben Kastens bewirken, sich außerhalb der Zone befinden und von der Regelvorrichtung der Anlage gesteuert werden können.
  8. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Entfernung, die das Band (1) von den Blasöffnungen (11) der Kästen trennt, variierbar ist, wobei diese Variierung eine fortschreitende sein kann.
  9. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Abstände zwischen den Blasöffnungen (11) der Kästen variiert werden, wobei diese Variierung eine fortschreitende sein kann.
  10. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Abmessungen der Abstände der Blasöffnungen (11) der Kästen variiert werden, wobei diese Variierung eine fortschreitende sein kann.
  11. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Abmessungen der Blasöffnungen der verschiedenen Zonen ein und desselben Kastens eingestellt werden, um die Kühlkapazität zwischen diesen Zonen zu regeln.
  12. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass sie Ablenkeinrichtungen (12) umfasst, die auf beiden Seiten des Bandes (1) und/oder an den Seitenflächen der Kästen in der Nähe des Punkts angebracht sind, an welchem die Modifizierung des Abkühlungsgefälles erfolgt, um das Kühlgas zwischen die Ablenkeinrichtungen und das Band zu lenken, um eine fortschreitende Erwärmung des Gases sicherzustellen und die Wirksamkeit der Abkühlung über die Länge dieser Ablenkeinrichtungen zu verringern.
  13. Vorrichtung nach einem der Ansprüche 6 bis 12, dadurch gekennzeichnet, dass sie außerdem Mittel umfasst, um zwischen den Rändern und der Mitte des Bandes (1) eine Spannungsdifferenz zu erzeugen, die eine Verformung des Bandes und von dessen Planheit bewirkt, wobei so die Effekte der Druckflächen begrenzt werden, die sich bei einer Veränderung des Abkühlungsgefälles bilden.
  14. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass die Mittel thermische Mittel sind.
  15. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass die Mittel mechanische Mittel, insbesondere ein geeignetes Profil von Eingangsrolle (3) und Ausgangsrolle (10), sind.
EP00403318A 1999-12-17 2000-11-28 Verfahren und Vorrichtung zum Vermeiden von Falten in einem Band in der Schnellkühlstrecke einer Wärmebehandlungsanlage Expired - Lifetime EP1108795B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9916011A FR2802552B1 (fr) 1999-12-17 1999-12-17 Procede et dispositif de reduction des plis de bande dans une zone de refroidissement rapide de ligne de traitement thermique
FR9916011 1999-12-17

Publications (2)

Publication Number Publication Date
EP1108795A1 EP1108795A1 (de) 2001-06-20
EP1108795B1 true EP1108795B1 (de) 2005-04-27

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EP00403318A Expired - Lifetime EP1108795B1 (de) 1999-12-17 2000-11-28 Verfahren und Vorrichtung zum Vermeiden von Falten in einem Band in der Schnellkühlstrecke einer Wärmebehandlungsanlage

Country Status (8)

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US (1) US6464808B2 (de)
EP (1) EP1108795B1 (de)
JP (1) JP2001200319A (de)
CN (1) CN1141404C (de)
AT (1) ATE294249T1 (de)
DE (2) DE1108795T1 (de)
ES (1) ES2158833T3 (de)
FR (1) FR2802552B1 (de)

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JP4593976B2 (ja) * 2004-05-31 2010-12-08 株式会社神戸製鋼所 連続焼鈍炉での鋼板のガスジェット冷却装置
FR2876710B1 (fr) 2004-10-19 2014-12-26 Kappa Thermline Procede et dispositif de limitation de la vibration de bandes d'acier ou d'aluminium dans des zones de refroidissement par soufflage de gaz ou d'air
FR2897620B1 (fr) * 2006-02-21 2008-04-04 Stein Heurtey Procede et dispositif de refroidissement et de stabilisation de bande dans une ligne continue
FR2900661B1 (fr) * 2006-05-02 2008-09-26 Stein Heurtey Perfectionnement apporte aux sections de chauffage rapide des lignes de traitement thermique en continu.
FR2940978B1 (fr) 2009-01-09 2011-11-11 Fives Stein Procede et section de refroidissement d'une bande metallique en defilement par projection d'un liquide
EP2513582B1 (de) * 2009-12-15 2018-05-02 Primetals Technologies France SAS Ausrüstung zur vorerwärmung von kontinuierlich beweglichem bandstahl
AT511034B1 (de) * 2011-02-04 2013-01-15 Andritz Tech & Asset Man Gmbh Verfahren zum kontrollieren einer schutzgasatmosphäre in einer schutzgaskammer zur behandlung eines metallbandes
ES2623037T3 (es) * 2013-07-16 2017-07-10 Cockerill Maintenance & Ingéniérie S.A. Sistema de pre-refrigeración con regulación interna piloto
FR3014447B1 (fr) * 2013-12-05 2016-02-05 Fives Stein Procede et installation de traitement thermique en continu d'une bande d'acier
UA124536C2 (uk) 2016-05-10 2021-10-05 Юнайтед Стейтс Стііл Корпорейшн Вироби з високоміцної сталі і способи їх виготовлення
US11560606B2 (en) 2016-05-10 2023-01-24 United States Steel Corporation Methods of producing continuously cast hot rolled high strength steel sheet products
US11993823B2 (en) 2016-05-10 2024-05-28 United States Steel Corporation High strength annealed steel products and annealing processes for making the same
KR102209602B1 (ko) * 2018-12-07 2021-01-28 주식회사 포스코 강판 냉각 장치
MX2021013567A (es) 2019-05-07 2022-04-01 United States Steel Corp Metodos para fabricar productos de lamina de acero de alta resistencia colados y laminados en caliente en forma continua.
PL3763836T3 (pl) 2019-07-11 2023-09-11 John Cockerill S.A. Urządzenie chłodzące do nadmuchiwania gazu na powierzchnię przemieszczającej się taśmy
BR112022001335A2 (pt) 2019-08-07 2022-03-22 United States Steel Corp Produto de chapa de aço de têmpera e separação, e, método para produzir produto de chapa de aço de têmpera e separação
JP2022544765A (ja) 2019-08-19 2022-10-21 ユナイテッド ステイツ スチール コーポレイション 高強度鋼製品及び該製品を製造するためのアニーリングプロセス
FR3101888B1 (fr) 2019-10-14 2024-02-09 Fives Stein Refroidissement rapide des tôles d’acier à haute limite élastique

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Also Published As

Publication number Publication date
US6464808B2 (en) 2002-10-15
DE60019708D1 (de) 2005-06-02
DE60019708T2 (de) 2005-09-29
JP2001200319A (ja) 2001-07-24
EP1108795A1 (de) 2001-06-20
US20020124916A1 (en) 2002-09-12
DE1108795T1 (de) 2001-12-20
FR2802552B1 (fr) 2002-03-29
ATE294249T1 (de) 2005-05-15
CN1300859A (zh) 2001-06-27
FR2802552A1 (fr) 2001-06-22
ES2158833T3 (es) 2005-12-01
CN1141404C (zh) 2004-03-10
ES2158833T1 (es) 2001-09-16

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