EP3303643A1 - Wärmebehandlungsanlage zur wärmebehandlung von stahlband und verfahren zur steuerung einer wärmebehandlungsanlage zur wärmebehandlung von stahlband - Google Patents
Wärmebehandlungsanlage zur wärmebehandlung von stahlband und verfahren zur steuerung einer wärmebehandlungsanlage zur wärmebehandlung von stahlbandInfo
- Publication number
- EP3303643A1 EP3303643A1 EP16728252.4A EP16728252A EP3303643A1 EP 3303643 A1 EP3303643 A1 EP 3303643A1 EP 16728252 A EP16728252 A EP 16728252A EP 3303643 A1 EP3303643 A1 EP 3303643A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat treatment
- steel strip
- annealing
- heat
- cycle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 69
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000009434 installation Methods 0.000 title abstract 4
- 238000000137 annealing Methods 0.000 claims abstract description 66
- 230000008569 process Effects 0.000 claims abstract description 28
- 238000005097 cold rolling Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000010583 slow cooling Methods 0.000 description 9
- 230000007704 transition Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- Heat treatment plant for heat treatment of steel strip and method for controlling a heat treatment plant for heat treatment of steel strip
- 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 multiple pre-processes that have passed through the heat-treated steel strip selected value, are processed to adjust or control at least one manipulated variable of the current annealing or heat treatment process or cycle.
- the invention is directed to 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, which runs 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
- page 1 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 pre-band cut data and / or the pre-processing data having undergone the heat-treated steel strip selected value for adjusting or controlling at least one manipulated variable of the current annealing or heat treatment process or cycle ,
- 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. In the following oven, 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
- Page 2 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.
- European Patent Application EP 2 557 183 A1 discloses a method in which the mechanical properties are to be better adjusted over the strip length.
- 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.
- 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. In addition, the simulated value deviates from one
- Page 3 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
- 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, i. Homogenization is not only possible over more than one strip 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. In the event that the predicted mechanical
- 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
- 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 available, information on which part of the hot strip or cold strip the band to be annealed is composed. If 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
- Page 7 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 previous band or to 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, i. 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
- page 8 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 gives the values for the slow cooling temperature which must be used to keep the mechanical properties constant.
- Page 9 For certain grades of steel, the following course of the mechanical properties after the anneal can be obtained over the strip length, with stable operation of the annealing furnace, and this 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015209799 | 2015-05-28 | ||
PCT/EP2016/062027 WO2016189144A1 (de) | 2015-05-28 | 2016-05-27 | Wärmebehandlungsanlage zur wärmebehandlung von stahlband und verfahren zur steuerung einer wärmebehandlungsanlage zur wärmebehandlung von stahlband |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3303643A1 true EP3303643A1 (de) | 2018-04-11 |
EP3303643B1 EP3303643B1 (de) | 2019-10-02 |
Family
ID=56117680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16728252.4A Active EP3303643B1 (de) | 2015-05-28 | 2016-05-27 | Wärmebehandlungsanlage zur wärmebehandlung von stahlband und verfahren zur steuerung einer wärmebehandlungsanlage zur wärmebehandlung von stahlband |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3303643B1 (de) |
CN (1) | CN108026604B (de) |
WO (1) | WO2016189144A1 (de) |
Families Citing this family (6)
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 |
US20200165696A1 (en) | 2017-07-12 | 2020-05-28 | Tata Steel Nederland Technology B.V. | Method for operating a continuous processing line |
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 |
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 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2833461B2 (ja) | 1993-12-28 | 1998-12-09 | 日本鋼管株式会社 | 金属帯の板温制御方法 |
JP4383493B2 (ja) | 2007-08-17 | 2009-12-16 | 新日本製鐵株式会社 | 780MPa以上のTSを持つハイテン出荷鋼板の材質情報提供方法及び材質情報利用方法 |
CN100491546C (zh) * | 2007-11-22 | 2009-05-27 | 武汉钢铁(集团)公司 | 罩式炉退火自适应控制方法 |
CN102279607A (zh) * | 2011-07-06 | 2011-12-14 | 联众(广州)不锈钢有限公司 | 一种退火炉炉区温度控制方法 |
EP2557183A1 (de) | 2011-08-12 | 2013-02-13 | Siemens Aktiengesellschaft | Verfahren zum Betrieb einer Konti-Glühe für die Verarbeitung eines Walzguts |
JP2013087319A (ja) | 2011-10-17 | 2013-05-13 | Jfe Steel Corp | 直火型連続加熱炉の制御方法および制御装置 |
CN102560081B (zh) * | 2012-02-27 | 2013-10-30 | 宝山钢铁股份有限公司 | 一种基于带钢力学性能预报模型的加热炉节能控制方法 |
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 |
-
2016
- 2016-05-27 CN CN201680042133.2A patent/CN108026604B/zh active Active
- 2016-05-27 EP EP16728252.4A patent/EP3303643B1/de active Active
- 2016-05-27 WO PCT/EP2016/062027 patent/WO2016189144A1/de active Search and Examination
Also Published As
Publication number | Publication date |
---|---|
EP3303643B1 (de) | 2019-10-02 |
CN108026604B (zh) | 2020-06-30 |
CN108026604A (zh) | 2018-05-11 |
WO2016189144A1 (de) | 2016-12-01 |
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