EP3941655B1 - Installation et procédé pour fabriquer un feuillard à chaud métallique - Google Patents

Installation et procédé pour fabriquer un feuillard à chaud métallique Download PDF

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Publication number
EP3941655B1
EP3941655B1 EP20712883.6A EP20712883A EP3941655B1 EP 3941655 B1 EP3941655 B1 EP 3941655B1 EP 20712883 A EP20712883 A EP 20712883A EP 3941655 B1 EP3941655 B1 EP 3941655B1
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EP
European Patent Office
Prior art keywords
hot
cooling
rolled strip
roll stand
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.)
Active
Application number
EP20712883.6A
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German (de)
English (en)
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EP3941655A1 (fr
EP3941655C0 (fr
Inventor
Wolfgang Fuchs
Henning Berg
August Sprock
Ulrich Cramer
Christoph Hassel
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 Group GmbH
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SMS Group GmbH
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Filing date
Publication date
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Publication of EP3941655A1 publication Critical patent/EP3941655A1/fr
Application granted granted Critical
Publication of EP3941655B1 publication Critical patent/EP3941655B1/fr
Publication of EP3941655C0 publication Critical patent/EP3941655C0/fr
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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
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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

Definitions

  • the present invention relates to a system and a method for producing metallic hot strip with improved mechanical properties due to a fine grain structure of the structure.
  • warm rolling stock is plastically deformed in a roll gap between two work rolls of a rolling stand, thereby reducing the thickness of the rolling stock.
  • the rolled stock is typically cooled in a cooling train and then conveyed out of the rolling train, for example as coils or sheets.
  • Hot rolling mills usually have a rolling train with a fixed number of rolling stands. It is generally not possible to remove one or more rolling stands when producing thick strips and add them again when producing thin strips.
  • Thick strips experience a smaller reduction in thickness in a rolling mill than thin strips.
  • a thick strip is often finished rolling before the last rolling stand, whereas a thin strip in the same rolling mill is only finished in the last one Roll stand is finished rolling.
  • the thick strip passes through the nth rolling stands of a rolling train unrolled.
  • the EP 3 434 383 A1 A stand cooler was proposed, which can be installed in place of the work rolls of a roll stand that are not required for thick strips.
  • compact cooling units are used, each of which applies a jet of cooling fluid concentrated to a specific section onto the hot strip.
  • the length measured in the conveying direction of the steel strip to be hot-rolled, via which the cooling unit, which is arranged behind one of the rolling stands within the rolling train in the conveying direction, applies cooling fluid to the steel strip, in the known system at a maximum of 25% of the distance at which the rolling stands of the rolling train, which are arranged adjacent to one another, are set up one after the other in the conveying direction , limited. Due to the limitation of 25% of the distance, very large quantities of cooling water have to be transported in the immediate vicinity of the scaffolding. The exposure time of the cooling fluid is very limited.
  • the WO 2011 / 138 159 A1 discloses a device and a method for hot rolling steel strips in several successive rolling stands, wherein the steel strips are first rolled in the austenitic state in one or more rolling stands and then, after liquid cooling, in the ferritic state to the final thickness. In order to ensure that the steel strip actually reaches the ferritic state after cooling, it is intended that the final thickness of the steel strip is less than 3 mm.
  • the difference between the The exit temperature of the steel strip from the last rolling stand before the liquid cooling and the equilibrium austenite limit temperature is set by the pilot control or regulation of the exit temperature to a maximum of 70 K, preferably not more than 50 K, preferably less than 25 K.
  • the first upper and/or the first lower rapid cooling spray bars are arranged immediately behind the outlet of the n-1'th or n'th roll stand in order to cool the hot strip immediately after it leaves the roll gap on the outlet side.
  • the cooling medium can in particular be water, which is usually already available in large quantities in a plant for producing metallic hot strip.
  • the high heat capacity of water can allow the hot strip to cool down particularly quickly.
  • the nozzle outlet from the rapid cooling spray bars is designed in such a way that the emerging coolant can act on the hot strip immediately after leaving the roll gap on the outlet side, so that the coolant flow from a distance of less than 500 mm, preferably less than 400 mm, particularly preferably less than 350 mm after leaving the roll gap on the hot strip and the cooling of the hot strip occurs immediately after leaving the n-1'th roll stand.
  • the rolling train has a tracking system, whereby the tracking system tracks the position of the hot strip and the rapid cooling control device receives a signal to start as soon as the start of the hot strip passes through the roll gap and a time-delayed signal to stop is given as soon as the hot strip has passed has left the roll gap, so that the cooling of the hot strip occurs immediately after leaving the n-1'th roll stand.
  • the upper rapid cooling spray bar and/or the lower rapid cooling spray bar is set up to spray the cooling medium at a pressure of 1 to 20 bar, in particular 3.0 to 10 bar. particularly 3.0 to 5 bar.
  • the application of the cooling medium at a pressure of 1 to 20 bar facilitates particularly rapid cooling of the strip through a turbulent fluid flow on the top and bottom of the strip.
  • Dispensing the cooling medium at a pressure of 3.0 to 10 bar, in particular 3.0 to 5 bar can simplify the control of the cooling device.
  • the cooling device has more than one upper rapid cooling spray bar and/or more than one lower rapid cooling spray bar for applying the cooling medium to the top or bottom of the hot strip.
  • the upper rapid cooling spray bars are intended for applying the cooling medium to the top side and the lower rapid cooling spray bars are intended for applying the cooling medium to the underside of the hot strip.
  • the use of multiple rapid cooling spray bars can further simplify the control of the cooling device.
  • the cooling rate can be varied in the conveying direction of the hot strip to achieve an optimal structure.
  • the cooling device has at least one upper rapid cooling spray bar arranged after the nth rolling stand for applying the cooling medium to an upper side of the hot strip, which is identical in construction to the first upper rapid cooling spray bar.
  • the cooling device has at least one lower rapid cooling spray bar arranged after the nth roll stand for applying the cooling medium to the underside of the hot strip, which is identical in construction to the first lower rapid cooling spray bar.
  • a further embodiment of the system for producing metallic hot strip provides that the system has a process computer for determining the amount of cooling medium and / or distributing the amount of cooling medium to the rapid cooling spray bar or beams.
  • the process computer depending on the chemical composition and/or the dimensions of the metallic material to be rolled, the cooling rates and cooling courses can be specifically adjusted in order to favorably influence the structure of the hot strip and its mechanical properties.
  • the process computer can with one after the nth, in particular
  • the measuring device arranged on the last rolling stand can be connected in order to regulate the amount of cooling medium and/or distribution of the amount of cooling medium to the rapid cooling spray bar or beams during operation depending on the values measured by the measuring device, for example the temperature of the hot strip.
  • an exemplary embodiment of the system for producing metallic hot strip is proposed, in which the n-1'th rolling stand is set up to carry out the last rolling pass.
  • the cooling device can therefore be used to enable very rapid, early cooling of the hot strip directly after the last rolling pass, so that a very fine structure with corresponding advantageous material properties can be obtained.
  • the n'th roll stand with which no further thickness reduction is carried out, can shield a measuring device arranged behind the n'th roll stand from/from the cooling medium discharged with the cooling device. The risk of an influence on the measurement and/or damage to the measuring device due to the large quantities of cooling medium required for rapid cooling can thus be reduced.
  • the rolls of the nth, in particular the last, roll stand are used as squeezing rolls or as drive rolls.
  • the rolls of the nth roll stand can therefore significantly reduce the amount of cooling medium on the hot strip.
  • the hot strip can be continued after the nth rolling pass and the strip run can be stabilized. This can further increase the quality of the hot strip produced.
  • the rolls of the nth roll stand are used to carry out a skin pass with an extension of less than 10% (preferably less than 3%) in order to eliminate possible flatness errors.
  • a further embodiment of the system for producing metallic hot strip provides that at least one of the upper and lower rapid cooling spray bars is arranged extendable. This can simplify maintenance in the area between the rolling stands.
  • the system can, for example, be designed in such a way that the rapid cooling spray bars can be extended laterally, ie in the plane of the hot strip and perpendicular to the conveying direction. In principle, it is also conceivable to design the system in such a way that the rapid cooling spray bars can be extended in a direction perpendicular to the hot strip.
  • the cooling of the rolling stock or the hot strip begins immediately spatially and temporally after leaving the n-1'th rolling stand.
  • the nozzle outlet from the rapid cooling spray bars is designed in such a way that the emerging coolant can act on the hot strip immediately after leaving the roll gap on the outlet side.
  • the coolant flow acts on the rolling stock from a distance of less than 500 mm, preferably less than 400 mm, particularly preferably less than 350 mm after leaving the roll gap.
  • rapid cooling also begins immediately when the n-1st roll stand is left.
  • the position of the hot strip is tracked via a tracking system.
  • the rapid cooling control device receives a signal to start.
  • a time-delayed stop signal occurs as soon as the rolling stock or hot strip has left the rolling gap.
  • Fig. 1 a plant A for the production of metallic hot strip B.
  • the system A for the production of metallic hot strip B includes a hot rolling train for carrying out one or more rolling passes.
  • the hot strip B is conveyed in the conveying direction F through the n roll stands, in particular the n-1'th roll stand and the n'th roll stand.
  • the stand n-1 denotes the penultimate roll stand and n the last roll stand.
  • n can be the 4th to 8th rolling stand of a rolling train.
  • the n-1'th rolling stand is set up to carry out the last rolling pass.
  • the system A also has a cooling device which is in the Fig. 1 Embodiment shown includes four upper rapid cooling spray bars SK1o, SK2o, SK3o, SK4o and four lower rapid cooling spray bars SK1u, SK2u, SK3u, SK4u.
  • a cooling device which is in the Fig. 1 Embodiment shown includes four upper rapid cooling spray bars SK1o, SK2o, SK3o, SK4o and four lower rapid cooling spray bars SK1u, SK2u, SK3u, SK4u.
  • the number of rapid cooling spray bars which apply cooling medium W to the top side O of the hot strip B can differ from the number of rapid cooling spray bars which apply cooling medium W to the underside U of the hot strip B.
  • the design of an upper rapid cooling spray bar differs from the design of a lower rapid cooling spray bar, as stated in the Fig. 1 is indicated in relation to the pair of rapid cooling spray bars SK3o/SK3u.
  • the pair of rapid cooling spray bars SK1o/SK1u provided for cooling the hot strip B directly behind the roll gap of the n-1'th roll stand is identical in construction to the pair of rapid cooling spray bars SK4o/SK4u in the exemplary embodiment shown.
  • the system A has a control device S and a process computer P for determining the amount of water and distributing the amount of water to the rapid cooling spray bars SK1o, SK2o, SK3o, SK4a, SK1u, SK2u, SK3u, SK4u.
  • the process computer P accesses measurement data from a measuring device M, which is arranged shortly behind the nth, in particular behind the last, rolling stand of the rolling train.
  • the measuring device for example, the temperature and temperature distribution, the thickness of the hot strip and the thickness profile of the hot strip transverse to the transport direction can be determined.
  • the Measuring device M can, for example, be designed as a so-called measuring house.
  • the nth roll stand shields a large part of the cooling medium M for cooling the hot strip from the measuring device M.
  • the rolls of the nth roll stand can be used as squeezing rolls or drive rolls and remove the cooling medium located on the hot strip B.
  • the rolls of the nth roll stand By using the rolls of the nth roll stand as squeezing rolls or drive rolls, the strip run can also be stabilized.
  • the control device S in the form of a tracking system is connected to the rolling stand in terms of signals in order to start the action of the coolant on the hot strip upon receipt of the signal that the hot strip is in the roll gap and to start the action of the coolant on the hot strip upon receipt of the signal that the hot bath has left the roll gap to stop the effect of the coolant on the hot strip with a time delay.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)

Claims (10)

  1. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) dotée d'un train de laminage à chaud pour effectuer une ou plusieurs passes de laminage, ledit train de laminage à chaud comportant au moins deux cages de laminage n-1, n disposées l'une derrière l'autre dans la direction de transport (F) de la tôle (B), et
    d'un dispositif de refroidissement,
    dans lequel le dispositif de refroidissement comporte au moins une première barre de pulvérisation supérieure de refroidissement rapide (SK1o) permettant de pulvériser un agent de refroidissement (W) sur la face supérieure (O) de la tôle (B) entre la n-1ième cage de laminoir et la nième cage de laminoir, et
    dans lequel le dispositif de refroidissement comporte au moins une première barre de pulvérisation inférieure de refroidissement rapide (SK1u) permettant de pulvériser un agent de refroidissement (W) sur la face inférieure (U) de la tôle (B) entre la n-1ième cage de laminoir et la nième cage de laminoir,
    caractérisée en ce que,
    le dispositif de refroidissement est conçu pour couvrir > 30 pour cent de la longueur (L) de la tôle (B) entre la n-1ième cage de laminoir et la nième cage de laminoir avec l'agent de refroidissement (W) ; et
    la première barre de pulvérisation supérieure de refroidissement rapide (SK1o) et/ou la première barre de pulvérisation inférieure de refroidissement rapide (SK1u) est disposée immédiatement derrière la sortie de la n-1ième cage de laminoir ; et
    la sortie de buses des barres de pulvérisation de refroidissement rapide (SK1o, SK1u) est conçue de telle sorte que l'agent de refroidissement sortant puisse agir sur la tôle (B) immédiatement après avoir quitté l'emprise de laminage côté sortie, de telle sorte que le flux d'agent de refroidissement agit sur la tôle (B) à partir d'une distance inférieure à 500 mm, de préférence inférieure à 400 mm, de manière particulièrement préférée inférieure à 350 mm après avoir quitté l'emprise de laminage et le refroidissement de la tôle (B) se produit immédiatement après avoir quitté la n-1ième cage de laminoir ; et
    le train de laminage comporte un système de suivi, ledit système de suivi suivant la position de la tôle (B) et le dispositif de commande des barres de pulvérisation de refroidissement rapide (SK1o, SK1u) recevant un signal de démarrage dès que le début de la tôle (B) passe à travers l'emprise de laminage et un signal d'arrêt temporisé est donné dès que la tôle (B) a quitté l'emprise de laminage, de sorte que le refroidissement de la tôle (B) se produit dans l'emprise de laminage immédiatement après avoir quitté la n-1ième cage de laminoir.
  2. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) selon la revendication 1, dans laquelle la première barre de pulvérisation supérieure de refroidissement rapide (SK1o) et/ou la première barre de pulvérisation inférieure de refroidissement rapide (SK1u) sont agencées de manière à pulvériser l'agent de refroidissement à une pression de 1 à 20 bars, en particulier de 3,0 à 10 bars, tout particulièrement de 3,0 à 5 bars.
  3. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) selon l'une des revendications 1 ou 2, dans laquelle le dispositif de refroidissement est conçu pour refroidir la tôle (B) à un taux de refroidissement spécifique supérieur à 300 K/s par mm d'épaisseur de tôle, en particulier à un taux de refroidissement supérieur à 900 K/s par mm d'épaisseur de tôle.
  4. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) selon l'une des revendications précédentes, dans laquelle le dispositif de refroidissement comporte plus d'une barre de pulvérisation supérieure de refroidissement rapide (SK1o, SK2o, SK3o, SK4o) et/ou plus d'une barre de pulvérisation inférieure de refroidissement rapide (SK1u, SK2u, SK3u, SK4u) permettant de pulvériser l'agent de refroidissement (W) sur la face supérieure (O) ou la face inférieure (U) de la tôle.
  5. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) selon l'une des revendications précédentes, dans laquelle le dispositif de refroidissement comporte au moins une barre de pulvérisation supérieure de refroidissement rapide (SK4o) disposée après la nième cage de laminoir permettant de pulvériser l'agent de refroidissement ( W) sur une face supérieure (O) de la tôle (B), qui est de construction identique à la première barre de pulvérisation supérieure de refroidissement rapide (SK1o), et/ou comporte au moins une barre de pulvérisation inférieure de refroidissement rapide (SK4u) disposée après la nième cage de laminoir permettant de pulvériser l'agent de refroidissement (W) sur une face inférieure (U) de la tôle (B), qui est de construction identique à la première barre de pulvérisation inférieure de refroidissement rapide (SK1u).
  6. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) selon l'une des revendications précédentes, dans laquelle l'installation (A) comporte un ordinateur de processus (P) permettant de déterminer la quantité d'agent de refroidissement et/ou de répartir la quantité d'agent de refroidissement sur la ou les barres de pulvérisation de refroidissement rapide (SK1o, SK1u, SK2o, SK2u, SK3o, SK3u, SK4o, SK4u).
  7. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) selon l'une des revendications précédentes, dans laquelle la n-1ième cage de laminoir est agencée de manière à effectuer la dernière passe de laminage.
  8. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) selon l'une des revendications précédentes, dans laquelle les cylindres de la nième cage de laminoir sont utilisés comme cylindres presseurs ou cylindres d'entraînement.
  9. Installation (A) pour la fabrication de tôle métallique laminée à chaud (B) selon l'une des revendications précédentes, dans laquelle au moins l'une des barres de pulvérisation de refroidissement rapide supérieure et inférieure (SK1o, SK1u, SK2o, SK2u, SK3o, SK3u, SK4o, SK4u) est agencée de manière à pouvoir être déployée.
  10. Procédé de fabrication de tôle métallique laminée à chaud (B) en utilisant une installation selon l'une quelconque des revendications précédentes 7 à 9, dans lequel la dernière passe de laminage est effectuée avec la n-1ième cage de laminoir ; et dans lequel la tôle (B) est refroidie directement derrière l'emprise de la n-1ième cage de laminoir à un taux de refroidissement spécifique supérieur à 600 K/s par mm d'épaisseur de tôle.
EP20712883.6A 2019-03-18 2020-03-13 Installation et procédé pour fabriquer un feuillard à chaud métallique Active EP3941655B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019203654 2019-03-18
DE102019220033.8A DE102019220033A1 (de) 2019-03-18 2019-12-18 Anlage und Verfahren zur Herstellung von metallischem Warmband
PCT/EP2020/056930 WO2020187774A1 (fr) 2019-03-18 2020-03-13 Installation et procédé pour fabriquer un feuillard à chaud métallique

Publications (3)

Publication Number Publication Date
EP3941655A1 EP3941655A1 (fr) 2022-01-26
EP3941655B1 true EP3941655B1 (fr) 2023-12-27
EP3941655C0 EP3941655C0 (fr) 2023-12-27

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EP20712883.6A Active EP3941655B1 (fr) 2019-03-18 2020-03-13 Installation et procédé pour fabriquer un feuillard à chaud métallique

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EP (1) EP3941655B1 (fr)
DE (1) DE102019220033A1 (fr)
WO (1) WO2020187774A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114669613B (zh) * 2022-04-19 2023-06-20 安徽工业大学 一种柔性辊接触式的薄带组合冷却方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT509707B1 (de) * 2010-05-04 2011-11-15 Siemens Vai Metals Tech Gmbh Verfahren zum warmwalzen von stahlbändern und warmwalzstrasse
DE102013019698A1 (de) * 2013-05-03 2014-11-06 Sms Siemag Ag Verfahren zur Herstellung eines metallischen Bandes
DE102013107010A1 (de) 2013-07-03 2015-01-22 Thyssenkrupp Steel Europe Ag Anlage und Verfahren zum Warmwalzen von Stahlband
EP3434393B1 (fr) 2017-07-24 2019-09-11 Matsuura Machinery Corporation Procédé de mise en forme tridimensionnelle
EP3434383A1 (fr) 2017-07-24 2019-01-30 Primetals Technologies Austria GmbH Dispositif de refroidissement de cage permettant le refroidissement d'un feuillard en acier dans une cage de laminoir

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Publication number Publication date
EP3941655A1 (fr) 2022-01-26
DE102019220033A1 (de) 2020-09-24
EP3941655C0 (fr) 2023-12-27
WO2020187774A1 (fr) 2020-09-24

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