EP3303643B1 - Installation de traitement thermique pour le traitement thermique d'une bande d'acier et procédé pour commander une installation de traitement thermique pour le traitement thermique d'une bande d'acier - Google Patents

Installation de traitement thermique pour le traitement thermique d'une bande d'acier et procédé pour commander une installation de traitement thermique pour le traitement thermique d'une bande d'acier Download PDF

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Publication number
EP3303643B1
EP3303643B1 EP16728252.4A EP16728252A EP3303643B1 EP 3303643 B1 EP3303643 B1 EP 3303643B1 EP 16728252 A EP16728252 A EP 16728252A EP 3303643 B1 EP3303643 B1 EP 3303643B1
Authority
EP
European Patent Office
Prior art keywords
heat
annealing
steel strip
treatment
data
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.)
Revoked
Application number
EP16728252.4A
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German (de)
English (en)
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EP3303643A1 (fr
Inventor
Ulrich Sommers
Alexandre LHOEST
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SMS Group GmbH
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SMS Group GmbH
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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value

Definitions

  • the invention is directed to a method for controlling a heat treatment plant for heat treatment of steel strip comprising at least one annealing furnace and having at least one control and / or regulating device, by means of which the heat treatment of a steel strip running in the heat treatment plant on compliance with at least one desired material property, in particular a mechanical property, is controlled and / or regulated, wherein the control and / or regulating device preferably comprises a prediction or prediction of the at least one mechanical property of the steel strip after passing through the heat treatment enabling model predictive control, in which input data, at least one of the group of data on the annealing cycle and / or the data of the steel strip to be heat treated and / or the data of a cold rolling process and / or the data relating to cutting a pre-band and / or the data to one or process, at least one manipulated variable of the current annealing or heat treatment process or cycle determined by the length of the steel strip to be heat treated, with a new strip a new annealing or heat treatment cycle begins.
  • the invention is directed to a heat treatment plant for the heat treatment of steel strip, comprising at least one annealing furnace and having at least one control and / or regulating device, the running in the heat treatment plant heat treatment of a steel strip for compliance with at least one desired material property, in particular a mechanical property controls or regulates, with the control and / or Preferably comprises a model predictive control enabling the prediction or prediction of at least one mechanical property of the steel strip after passing through the heat treatment, the input data comprising at least one of the annealing cycle data and / or the heat treatable steel strip data and / or the cold rolling process data and / or the data relating to cuts of a pre-strip and / or the data on one or more pre-processes which the steel strip to be heat treated has undergone selected value for adjusting or controlling at least one manipulated variable of the current steel strip determined by the length of the steel strip to be heat treated Annealing or heat treatment process or cycle processed.
  • the process sequence in a continuous annealing line is as follows: first, strips are unwound in the inlet of the line of reels and the ends are connected in a welding machine to form an endless belt. Thereafter, the belt passes through a cleaning section to remove any residual surface contamination from cold rolling. This is followed by a tape store that decouples an inlet area from the process area.
  • the strip goes through a multi-stage annealing process: preheating, heating, holding, rapid and slow cooling, over aging and final cooling. There are special temperature curves for each steel grade and strip geometry in the oven be set. This also applies to the transition region around the weld during material and / or geometry changes.
  • a strip accumulator is available that compensates downtime in the spout. If necessary, the strip then runs through a skin pass mill, in which the surface of the strip is provided with a defined degree of roughness and the desired material properties are set. This is followed by a tape storage, which compensates for the inspection and Coil Touch Meeting. Other stations include a trimmer for adjusting the belt width, a quality inspection station and a surface protection oiling machine. Finally, the tape is cut by a pair of scissors and wound up from reel to coil.
  • the temperature profile and the belt speed are the decisive factors for the quality in the annealing in such a continuous annealing. While a strip is in the annealing line, it essentially ensures that the temperature profile in the furnace remains within certain limits. This indirectly sets the quality of the mechanical properties. Also for the transitions between two bands the temperature profile is the essential quantity.
  • the patent DE102013 225579 A1 discloses a method of controlling a heat treatment system for metal strips. From the European patent application EP 2 557 183 A1 a method is known in which the mechanical properties over the tape length to be better adjusted. A controller reacts to the predicted mechanical properties. This method is described for changes over the tape length or parts of the tape, that is, also for changes from coil to coil. In this case, a model is used in which at least one band-specific input variable is supplied with reference to a point or a section of the rolling stock. The input quantity simulates a value after annealing or after the skin pass mill. In this case, the simulated value may deviate from a nominal value.
  • the simulated value deviates from one actual measured value, one or more model parameters of the model are adjusted, this being done in continuous real-time adaptation. If the simulated value deviates from a predefined setpoint value, at least one process variable of the heat treatment line or the continuous annealing line is controlled or regulated so that a model-predictive control takes place.
  • the problem with this method is that at the beginning of each new annealing cycle at the inlet of a new band in the annealing furnace, the previously issued by the controller manipulated variable must be changed. In the case of the known method, there is initially possibly a "wrong" manipulated variable, which then only has to be adjusted to the "correct” value. This means that the manipulated variable must first be "captured” again at the beginning of a new annealing cycle.
  • the invention is therefore based on the object to provide a solution which makes it possible to achieve an improvement of the control and / or regulation behavior.
  • This object is achieved by a method for controlling a heat treatment plant for heat treatment of steel strip according to claim 1 and a heat treatment plant for heat treatment of steel strip according to claim 3.
  • the object is achieved in that in the event that the at least one manipulated variable in the course of the current annealing or heat treatment cycle of an initial value a final value changes this control variable at the beginning of the next succeeding annealing or heat treatment cycle is reset to its initial value in the current annealing or heat treatment cycle.
  • control comprises a regulator and / or an actuator, which in the event that the at least one manipulated variable in the course of the current annealing or heat treatment cycle of an initial value changed a final value, this setpoint at the beginning of the next succeeding annealing or heat treatment cycle to its initial value in the current annealing or heat treatment cycle or reset.
  • the temperature after "slow cooling”, ie the temperature after slow cooling, is used as the at least one manipulated variable.
  • the focus is placed directly on the homogenization of the mechanical properties.
  • the predecessor and successor band is taken into account, ie the homogenization is not only possible over more than one band length, but also from band to band.
  • the control variable for the annealing is adapted from band to band by means of a regulator, the transitions between the bands are particularly delicate. In the method according to the invention, this is part of the overall strategy. If the information is available as to which hot-rolled strips the annealed strip is made up of, it can also be reacted to in the method according to the invention.
  • the at least one manipulated variable is returned to the initial value at the inlet of the connecting weld between a subject to the current annealing or heat treatment cycle current steel strip and a subsequent steel strip in the annealing furnace or reset.
  • the at least one manipulated variable at the inlet of the connecting weld between a subject to the current annealing or heat treatment cycle current steel strip and a subsequent steel strip in the annealing furnace by means of the controller and / or actuator to the initial value traceable or recoverable.
  • the plant according to the invention is in particular a continuous annealing line, a galvanizing line or another line for the heat treatment of steel, which comprises at least one annealing furnace.
  • Possible input data for the model for the mechanical properties in the annealer are annealing cycle data, such as belt speed and the temperature profile of the belt in the plant or furnace, where the temperature profile is the description of the temperature profile over time and location.
  • Further input data for the model is the model for the sizes, the material, in particular the mechanical properties at the end of the hot rolling mill or after the hot rolling mill or a mechanical properties meter at the end of the hot rolling mill or after the hot rolling mill.
  • Further possible input data are the cold rolling degree or a model for cold rolling, as well as information for tracking cuts and, if present, information on which part of the hot strip or cold strip the band to be annealed is composed.
  • a galvanized strip is made from a hot rolled strip, it indicates how much has been separated from the hot rolled strip. If an annealed strip is made up of various hot-rolled strips, it is defined how the annealed strip is composed of hot-rolled strips. If necessary, further process parameters of the plant or of the preliminary processes can be used.
  • Cycle manipulated variables may include, for example, the annealing temperature, holding time, temperature after any cooling range, heating or cooling rates, belt speed, the skin pass rate (if a skin pass mill is provided), the degree of stretch (if stretch levelers are present) and other process parameters. that describe the process. For every steel grade, there is a set of manipulated variables that has an influence on the mechanical properties of the steel grade.
  • the focus can be placed on deviations over the strip length or deviations from strip to strip. If only differences from band to band are considered, that means that the input data of the Pre-processes are assumed to be constant over the tape length. But there may still be differences over the tape length. Especially in this case, the transition between the bands is important because the beginning of the tape and the end of the tape are exposed to different conditions in the system to ensure the transition from the predecessor band or the subsequent band.
  • the model determines the mechanical properties at the end of the annealing line on the basis of the possible input data described above.
  • the model may be a regression model, a metallurgical model, or other types of models.
  • the input values are based on the calculated or measured values of the already processed band. In the case of data from the annealing line, these are actual values or target values depending on whether the band has passed the point at which the respective value is measured or not.
  • a furnace control for the annealing furnace As a further part of the process there is a furnace control for the annealing furnace.
  • the predicted mechanical property or several mechanical properties ie, for example, tensile strength and yield strength are part of the optimization.
  • the optimization according to steel quality in one case depends only on the mechanical properties or in the other case on a combination of deviations of the mechanical properties and the temperature deviations. It can also be specified that a certain area around the weld does not have to be within the desired quality. This area can then be used, for example, to adapt the control value back to a value from the beginning of the band.
  • the degree of temper rolling is determined with which the mechanical property becomes homogeneous over the strip length.
  • minimum and maximum values are considered.
  • the temperature after slow cooling is a suitable manipulated variable to influence the strength.
  • the new kiln control can use the existing means for determining the temperature profile in the first step, then the curve for the tensile strength is determined. Now, the course of the temperature after slow cooling is adjusted so that the resulting tensile strength over the band is as constant as possible. If the tensile strength does not change too quickly across the belt and the tensile strength always increases as the temperature increases after slow cooling, or if it decreases as the temperature is reduced, the predetermined course can be corrected. If the tensile strength over time and the possible settings for the temperature after slow cooling is applied, resulting in an area. The intersection of this surface with the plane passing through the initial value of the tensile strength yields the values for the slow cooling temperature which must be used to keep the mechanical properties constant.
  • the following course of the mechanical properties after annealing can be obtained over the strip length, with stable operation of the annealing furnace, which can be due to behavior in the hot rolling mill. It may be that the successive coils have the same direction of the course or the opposite direction of the course. It is typical that successive coils have similar process routes and thus the course goes in the same direction. This behavior can also be deliberately reversed by wrapping a tape. If this is the case, then the best behavior of the controller is achieved.
  • the course is specified in order to achieve a compensation of the mechanical properties.
  • the transition in the case of temperature transitions, is designed so that the area for which complete compensation is not possible and takes place at the most favorable point. This may be just around the weld, so that the area is then cut off or completely within the first or second coil, since the effects on the mechanical properties are less for the other coil than for the one coil.
  • measurements for the material properties at the beginning or in the furnace can also be used.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (4)

  1. Procédé pour la commande d'une installation de traitement thermique destinée au traitement thermique d'un ruban d'acier, qui comprend au moins un four de recuit et qui présente un mécanisme de commande et/ou de réglage au moyen duquel on commande et/ou on règle le traitement thermique, qui se déroule dans l'installation de traitement thermique, d'un ruban d'acier en ce qui concerne le maintien d'au moins une propriété matérielle désirée, en particulier d'une propriété mécanique ; dans lequel le mécanisme de commande et/ou de réglage comprend de préférence un réglage du type d'une commande prédictive permettant la prédiction ou le calcul prévisionnel de ladite au moins une propriété mécanique du ruban d'acier après la mise en oeuvre du traitement thermique, dans lequel sont traitées des données d'entrée qui comprennent au moins une valeur choisie parmi le groupe des données pour le cycle de recuit et/ou des données du ruban d'acier qui doit être soumis à un traitement thermique et/ou des données d'un processus de laminage à froid et/ou des données concernant des amorces de rupture et/ou des données concernant un ou plusieurs procédés préalables qu'a subi le ruban d'acier qui doit être soumis à un traitement thermique, pour la mise au point ou pour la commande ou pour le réglage d'au moins une variable de commande du processus ou du cycle actuel de traitement par recuit ou thermique déterminé par la longueur du ruban d'acier qui doit être soumis à un traitement thermique; dans lequel on commence un nouveau cycle de traitement par recuit ou thermique avec un nouveau ruban, caractérisé en ce que, dans le cas où au moins une variable de commande est modifiée au cours du cycle de traitement actuel par recuit ou thermique en passant d'une valeur de départ à une valeur finale, cette variable de commande est ramenée, au début du cycle de traitement par recuit ou thermique qui suit directement, à sa valeur de départ dans le cycle de traitement actuel par recuit ou thermique.
  2. Procédé selon la revendication 1, caractérisé en ce que ladite au moins une variable de commande, à l'entrée du joint de soudure faisant la liaison entre un ruban d'acier actuel soumis au cycle de traitement actuel par recuit ou thermique et un ruban d'acier suivant, dans le four de recuit, est remise ou ramenée à la valeur de départ.
  3. Installation de traitement thermique destinée au traitement thermique d'un ruban d'acier, qui comprend au moins un four de recuit et qui présente au moins un mécanisme de commande et/ou de réglage qui commande ou qui règle le traitement thermique, qui se déroule dans l'installation de traitement thermique, d'un ruban d'acier en ce qui concerne le maintien d'au moins une propriété matérielle désirée, en particulier une propriété mécanique ; dans laquelle le mécanisme de commande et/ou de réglage comprend de préférence un réglage du type d'une commande prédictive permettant la prédiction ou le calcul prévisionnel d'au moins une propriété mécanique du ruban d'acier après la mise en oeuvre du traitement thermique, qui traite des données d'entrée qui comprennent au moins une valeur choisie parmi le groupe des données pour le cycle de recuit et/ou des données du ruban en acier qui doit être soumis à un traitement thermique et/ou des données d'un processus de laminage à froid et/ou des données concernant des amorces de rupture et/ou des données concernant un ou plusieurs procédés préalables qu'a subi le ruban d'acier qui doit être soumis à un traitement thermique, pour la mise au point ou pour la commande ou pour le réglage d'au moins une variable de commande du processus ou du cycle actuel de traitement par recuit ou thermique déterminé par la longueur du ruban d'acier qui doit être soumis à un traitement thermique; dans laquelle on commence un nouveau cycle de traitement par recuit ou thermique avec un nouveau ruban, caractérisé en ce que le réglage comprend un dispositif de réglage et/ou un organe de mise au point qui, dans le cas où au moins une variable de commande est modifiée au cours du cycle de traitement actuel par recuit ou thermique en passant d'une valeur de départ à une valeur finale, remet ou ramène cette variable de commande, au début du cycle de traitement par recuit ou thermique qui suit directement, à sa valeur de départ dans le cycle de traitement actuel par recuit ou thermique.
  4. Installation de traitement thermique selon la revendication 3, caractérisée en ce que ladite au moins une variable de commande, à l'entrée du joint de soudure faisant la liaison entre un ruban d'acier actuel soumis au cycle de traitement actuel par recuit ou thermique et un ruban d'acier suivant, dans le four de recuit, peut être remise ou peut être ramenée à la valeur de départ au moyen du dispositif de réglage et/ou de l'organe de mise au point.
EP16728252.4A 2015-05-28 2016-05-27 Installation de traitement thermique pour le traitement thermique d'une bande d'acier et procédé pour commander une installation de traitement thermique pour le traitement thermique d'une bande d'acier Revoked EP3303643B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015209799 2015-05-28
PCT/EP2016/062027 WO2016189144A1 (fr) 2015-05-28 2016-05-27 Installation de traitement thermique pour le traitement thermique d'une bande d'acier et procédé pour commander une installation de traitement thermique pour le traitement thermique d'une bande d'acier

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EP3303643A1 EP3303643A1 (fr) 2018-04-11
EP3303643B1 true EP3303643B1 (fr) 2019-10-02

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EP16728252.4A Revoked EP3303643B1 (fr) 2015-05-28 2016-05-27 Installation de traitement thermique pour le traitement thermique d'une bande d'acier et procédé pour commander une installation de traitement thermique pour le traitement thermique d'une bande d'acier

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EP (1) EP3303643B1 (fr)
CN (1) CN108026604B (fr)
WO (1) WO2016189144A1 (fr)

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE102016222644A1 (de) 2016-03-14 2017-09-28 Sms Group Gmbh Verfahren zum Walzen und/oder zur Wärmebehandlung eines metallischen Produkts
DE102016214267A1 (de) * 2016-08-02 2018-02-08 Sms Group Gmbh Verfahren zum Betreiben eines Glühofens zum Glühen eines Metallbandes
DE102017210230A1 (de) 2017-06-20 2018-12-20 Sms Group Gmbh Verfahren zum Betreiben eines Glühofens
EP3652593B1 (fr) 2017-07-12 2022-07-27 Tata Steel Nederland Technology B.V. Procédé de fonctionnement d'une ligne de traitement continue
CN111378829A (zh) * 2018-12-31 2020-07-07 瑨祥(宜昌)机电设备有限公司 通过拉矫机延伸率的测定在线调节退火炉的工艺方法
EP4032628A1 (fr) * 2021-01-25 2022-07-27 Speira GmbH Utilisations des dispositifs de laminage à froid et procédé de laminage à froid régulé des feuilles d'aluminium
CN115522040B (zh) * 2021-06-25 2024-06-04 宝山钢铁股份有限公司 一种冷轧连续退火炉温度自动控制方法
CN116060474B (zh) * 2023-02-27 2025-07-29 武汉汇翔热工技术有限公司 带钢连续热镀铝锌产品退火机械性能在线检测方法和装置

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EP2177892A1 (fr) 2007-08-17 2010-04-21 Nippon Steel Corporation Procédé de fourniture d'informations de matériau pour une tôle d'acier sortante et procédé d'utilisation d'informations de matériau
EP2557183A1 (fr) 2011-08-12 2013-02-13 Siemens Aktiengesellschaft Procédé de fonctionnement d'une bougie continue pour le traitement d'un produit de laminage
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EP2557183A1 (fr) 2011-08-12 2013-02-13 Siemens Aktiengesellschaft Procédé de fonctionnement d'une bougie continue pour le traitement d'un produit de laminage
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DE102013225579A1 (de) 2013-05-22 2014-11-27 Sms Siemag Ag Vorrichtung und Verfahren zur Steuerung und/oder Regelung eines Glüh- oder Wärmebehandlungsofens einer Metallmaterial bearbeitenden Fertigungsstraße

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CN108026604A (zh) 2018-05-11
EP3303643A1 (fr) 2018-04-11
WO2016189144A1 (fr) 2016-12-01
CN108026604B (zh) 2020-06-30

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