EP4364867A1 - Laminage d'acier avec détection technique de mesure de la conversion de phase - Google Patents

Laminage d'acier avec détection technique de mesure de la conversion de phase Download PDF

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Publication number
EP4364867A1
EP4364867A1 EP22205487.6A EP22205487A EP4364867A1 EP 4364867 A1 EP4364867 A1 EP 4364867A1 EP 22205487 A EP22205487 A EP 22205487A EP 4364867 A1 EP4364867 A1 EP 4364867A1
Authority
EP
European Patent Office
Prior art keywords
rolling
strip
control device
sections
stand
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.)
Pending
Application number
EP22205487.6A
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German (de)
English (en)
Inventor
Simon Grosseiber
Helmut Fett
Gero Schwarz
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.)
Primetals Technologies Austria GmbH
Primetals Technologies Germany GmbH
Original Assignee
Primetals Technologies Austria GmbH
Primetals Technologies Germany GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Primetals Technologies Austria GmbH, Primetals Technologies Germany GmbH filed Critical Primetals Technologies Austria GmbH
Priority to EP22205487.6A priority Critical patent/EP4364867A1/fr
Priority to PCT/EP2023/079566 priority patent/WO2024094475A1/fr
Publication of EP4364867A1 publication Critical patent/EP4364867A1/fr
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/02—Austenitic rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/04—Ferritic rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current
    • B21B2275/12—Roll torque
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
    • 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
    • C21D2261/00—Machining or cutting being involved
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling

Definitions

  • the present invention is based on an operating method for at least one rolling stand of a rolling mill for rolling a steel strip, wherein during the rolling of successively rolled sections of the strip in the rolling stand, characteristic values for the rolling force and/or the rolling moment occurring are measured in each case during a rolling pass.
  • the present invention is further based on a control program for a control device of a rolling mill comprising at least one rolling stand for rolling a steel strip, wherein the control program comprises machine code that can be processed by the control device, wherein the processing of the machine code by the control device causes the control device to receive, during the rolling of successively rolled sections of the strip in the rolling stand during a rolling pass, values that are measured and characteristic of the rolling force and/or the rolling moment that occurs.
  • the present invention is further based on a control device of a rolling mill for rolling a steel strip, wherein the control device is programmed with such a control program, so that the control device carries out such an operating method during operation.
  • the present invention is further based on a rolling mill for rolling a steel strip, wherein the rolling mill comprises at least one rolling stand in which sections of the strip are rolled one after the other, wherein the rolling stand is assigned a detection device for the metrological detection of values which are characteristic of the rolling force occurring during rolling of the sections of the strip and/or the rolling torque occurring during rolling of the sections of the strip, wherein the rolling mill has a control device which controls the rolling stand, such that the control device is connected to the detection device for receiving the metrologically detected values.
  • the strip When rolling steel, depending on the specific plant configuration and the desired product, it is sensible or even necessary for the strip to have a ferritic or at least partially ferritic structure during rolling. This may be necessary in particular during the last rolling pass or during the last rolling passes of the finish rolling. However, it is difficult to determine exactly when the transformation of the structure from austenite to ferrite begins or ends. This is particularly true if the strip is cooled again before rolling, for example by means of so-called power cooling. During power cooling, the water is sprayed onto the strip at a high pressure of several bar, whereas with laminar cooling it is applied to the strip at a low pressure of usually less than 1 bar.
  • the determination is usually carried out using thermo-kinetic models that model both the temperature behavior of the strip and the forming behavior of the strip.
  • the modeling is subject to many inaccuracies. For example, in a multi-stand finishing train, the temperature is often measured before a descaler or before a cooling unit, with the descaler or cooling unit being located before the finishing train. From the time the temperature is recorded, only a model-based calculation of the temperature is carried out. The further this modeling progresses, the more errors can have an impact. Input variables that influence the modeling are often not known exactly. An example of such an input variable can be the chemical composition of the steel. Regardless of the exact situation, however, the model-based determination is always subject to certain errors.
  • the object of the present invention is to provide possibilities by means of which it is possible to determine with high accuracy which structure sections of the strip have during rolling in a rolling stand.
  • the present invention is based on the fact that, on the one hand, the rolling force required to roll a section of the strip becomes smaller the hotter the corresponding section is. This applies to both an austenitic structure and a ferritic structure. However, a considerably lower rolling force is required to form a ferritic structure than to form an austenitic structure. On the other hand, since an austenitic structure is present at high temperatures and a ferritic structure at low temperatures, two opposing effects overlap during cooling. On the one hand, the rolling force increases from the outset with otherwise constant conditions. On the other hand, the proportion of ferrite increases and the proportion of austenite decreases during cooling. Increasing the proportion of ferrite and decreasing the proportion of austenite result in a reduction in the rolling force.
  • the rolling force also decreases as the temperature drops.
  • a positive gradient of the rolling force relative to the temperature i.e. a decreasing rolling force as the temperature drops or an increasing rolling force as the temperature rises.
  • a negative gradient of the rolling force relative to the temperature results, i.e. an increasing rolling force as the temperature drops or a decreasing rolling force as the temperature rises. The same applies when rolling a purely ferritic structure.
  • the essential advantage of the procedure according to the invention is that it is not modelled with all its unavoidable uncertainties, but that based on measured values it can be decided with certainty whether or not a phase transformation from an austenitic to a ferritic structure occurs in the sections of the strip during rolling in the rolling stand.
  • the changes in the temperature of the sections are known based on modeled or otherwise specified data.
  • the changes in the temperature of the sections are determined or estimated based on a temperature measured before or after the sections are rolled.
  • a temperature can be measured for each section before rolling and the temperature during rolling can be determined or estimated from this.
  • the temperatures of the sections themselves also mean that their changes from section to section or compared to a (in principle arbitrary) reference temperature are known.
  • the temperature measurement can - as an exception - be carried out immediately before or after the respective rolling mill stand. As a rule, however, such temperature measurement only takes place before the first rolling mill stand in the rolling mill and/or after the last rolling mill stand in the rolling mill.
  • the method is carried out for several rolling passes carried out one after the other, it is possible in particular to adjust the operating parameters of the rolling mill in such a way that the rolling pass in which a phase transformation from an austenitic to a ferritic structure occurs for the first or last time is a predetermined rolling pass in the sequence of rolling passes.
  • the operating parameters of the rolling mill can be adjusted in such a way that the first rolling pass in the sequence of rolling passes is the rolling pass in which a phase transformation from an austenitic to a ferritic structure occurs for the first or last time, or that at least the last rolling pass in the sequence of rolling passes is only carried out after the phase transformation from an austenitic to a ferritic structure has been fully completed. It is even possible to vary the operating parameters in such a way that the phase transformation from an austenitic to a ferritic structure is already completed before the first rolling pass in the sequence of rolling passes. Of course, other approaches are also possible.
  • the operating parameters of the rolling mill prefferably be adjusted in such a way that a specified energy consumption of the rolling mill is minimized, a productivity of the rolling mill is maximized, a rolling force and/or a rolling moment of at least one of the rolling passes carried out by at least one of the rolling stands is reduced and/or a product property of the strip is optimized after the execution of the sequence of rolling passes.
  • the specified energy consumption can be the energy consumption of a single rolling stand, the energy consumption of all rolling stands or rolling passes, the energy consumption of units upstream and/or downstream of the rolling stand or stands (for example an induction furnace upstream of the rolling stand or stands, a cooling unit upstream of the rolling stand or stands and/or a cooling section downstream of the rolling stand or stands). Any combination is also possible.
  • the sections of the strip in the rolling stand in the respective rolling pass are rolled either austenitically or ferritically.
  • a decision is preferably made as to whether the sections of the strip in the rolling stand in the respective rolling pass are rolled austenitically or ferritically.
  • an adaptation of a model of the rolling of the strip is preferably dependent on this decision.
  • the dependency can mean that the model is adapted in one case, but not in the other. Above all, however, this can mean that the model is adapted in both cases, but in a different way than in the other case.
  • a respective model in which austenitic or ferritic rolling is modelled can be adapted independently of the other model.
  • the decision as to whether the sections of the strip in the rolling mill are to be rolled austenitically or ferritically can be made particularly easily if the two rolling passes in which a phase transformation from an austenitic to a ferritic structure occurs for the first time and for the last time are known. Specifically, in the rolling passes that are carried out before the rolling pass in which a phase transformation from an austenitic to a ferritic structure occurs for the first time, austenitic rolling takes place. Conversely, in the rolling passes that are carried out after the rolling pass in which a phase transformation from an austenitic to a ferritic structure occurs for the last time, ferritic rolling takes place.
  • the control program can be designed in the same way as the operating procedure. The same advantages apply here too.
  • control device with the features of claim 13.
  • the control device is programmed with a control program according to the invention, so that the control device executes an operating method according to the invention during operation.
  • the object is further achieved by a rolling mill with the features of claim 14.
  • the control device of the rolling mill is designed as a control device according to the invention.
  • control device is connected in data terms to a device for specifying the temperatures of the sections of the strip or their changes and/or the control device is connected in data terms to a temperature measuring station arranged upstream or downstream of the rolling stand for measuring the temperature of the sections.
  • a strip 2 is rolled in a rolling mill 1.
  • the strip 2 consists of steel.
  • the rolling in the rolling mill 1 is hot rolling.
  • the rolling mill 1 For rolling the strip 2, the rolling mill 1 comprises FIG 1 several rolling stands 3 in which the strip 2 is rolled sequentially one after the other in a corresponding number of rolling passes.
  • the number of rolling stands 3 can be between 3 and 7, for example. Shown in FIG 1 only the working rolls of the rolling stands 3.
  • the rolling stands 3 are, however, usually designed as four-high stands or as six-high stands, i.e. in addition to the working rolls they have at least backup rolls, and if necessary also intermediate rolls arranged between the working rolls and the backup rolls.
  • Various devices can be arranged upstream of the rolling stands 3. Purely as an example, FIG 1 a furnace 4 (for example an induction furnace), a descaling device 5 and a cooling unit 6 are shown. Furthermore, various devices can be arranged downstream of the rolling stands 3. Purely as an example, FIG 1 a cooling section 7, a shear 8 and a coiler 9. The upstream and/or downstream devices 4 to 9 can be regarded as components of the rolling mill 1.
  • FIG 1 The representation of FIG 1 , in which the rolling mill 1 represents a finishing train, is purely exemplary.
  • the upstream and downstream devices 4 to 9 can be present or not present as required.
  • several rolling stands 3 do not necessarily have to roll the strip 2 sequentially one after the other.
  • the rolling mill 1 would be designed as a reversing stand, for example as a Steckel rolling mill.
  • Volume 2 includes FIG 2 a large number of sections 10.
  • the division of the strip 2 into sections 10 is, however, only virtual, i.e. for the data processing of the strip 2.
  • the sections 10 can be defined, for example, by a clocked acquisition of data (for example every 50 ms to 500 ms, in particular every 200 ms to 400 ms). Alternatively, they can be defined by a certain length before rolling (for example 1 m) or a certain mass (for example 25 kg). Since the strip 2 is subjected to the rolling passes sequentially, this also applies to the individual sections 10.
  • the rolling mill 1 has a control device 11.
  • the rolling mill 1 and thus in particular each rolling stand 3 of the rolling mill 1 is controlled by the control device 11.
  • the control device 11 is programmed with a control program 12.
  • the control program 12 comprises machine code 13 which can be processed by the control device 11.
  • the programming of the control device 11 with the control program 12 or the processing of the machine code 13 by the control device 11 causes the control device 11 to carry out an operating procedure which is described below in connection with the FIG 3 and 4 will be explained in more detail.
  • the operating procedure is only explained for a single rolling stand 3 or a single rolling pass. However, it can be carried out for each of the rolling stands 3 or for each rolling pass.
  • the control device 11 receives a value for a respective section 10 of the strip 2 which is characteristic of the temperature T of the respective section 10 during rolling in the rolling stand 3.
  • the rolling mill 1 can be operated according to FIG 4 have a temperature measuring station 14 which is arranged upstream of the rolling stand 3 (in the case of a multi-stand rolling mill 3, the rolling stands 3 of the rolling mill).
  • the rolling mill 1 can be FIG 4 have a temperature measuring station 15 which is arranged downstream of the rolling stand 3 (in the case of a multi-stand rolling mill 3, the rolling stands 3 of the rolling mill).
  • the corresponding temperatures T', T" of the sections 10 are measured before or after rolling the sections.
  • the corresponding temperatures T of the control device 11 can be measured according to FIG 4 be specified by another device 16, for example a higher-level computer.
  • the control device is connected to the corresponding temperature measuring station 14, 15 or the device 16 via data technology.
  • the control device 11 determines or estimates in a step S2 a change in the ⁇ T of the temperature T of the respective section 10 of the belt 2 compared to an initial value or reference value.
  • the temperature T for the first section 10 of the belt 2 can represent the initial value or reference value.
  • the change ⁇ T of the temperature T thus has the value 0.
  • the change ⁇ T of the temperature T results from the difference between the respective temperature T and the temperature T of the first section 10 of the belt 2.
  • the measured temperature T', T" or the specified temperature T can be adopted directly.
  • the corresponding temperature T can be determined for the time at which the corresponding section 10 is rolled in the rolling stand 3 using the respective measured temperature T', T".
  • the determined temperature T for the first section 10 of the band 2 represents the initial value or reference value and for each further section 10 of the band 2 the change ⁇ T of the temperature T is determined by the difference between the respective temperature T and the temperature T of the first section 10 of the band 2.
  • the control device 11 receives (at least) one value that is characteristic of the rolling force FW that occurs when rolling the respective section 10 in the rolling stand 3.
  • the at least one value is measured during the rolling of the respective section 10 in the rolling stand 3 by means of a corresponding detection device 17.
  • the rolling stand 3 can have a pressure cell or the working pressures can be recorded in hydraulic actuating devices, whereby the rolling force can be determined in a manner known per se in conjunction with the effective working surfaces of the associated pistons.
  • the control device 11 can receive (at least) one value in step S3 that is characteristic of the rolling moment M that occurs when rolling this section 10 in the rolling stand 3.
  • the at least one value is measured during the rolling of the respective section 10 in the rolling stand 3 by means of a corresponding detection device 18.
  • the torque of a roller drive can be recorded or determined using the motor currents.
  • the control device 11 is connected to the detection device 17 and/or the detection device 18 to receive the measured values. In FIG 1 this is only shown for the second rolling stand 3. However, a corresponding detection device 17 can be present for each rolling stand 3.
  • control device 11 forms a pair of values from the temperature change ⁇ T of the respective section 10 and the associated rolling force FW.
  • step S5 the control device 11 checks whether steps S1 to S4 have been carried out often enough, i.e. whether a sufficient number of value pairs are available. As long as this is not the case, the control device 11 goes directly back to step S1. Otherwise, the control device 11 goes to a step S6.
  • step S6 the control device 11 determines a gradient G of the rolling force FW relative to the temperature T.
  • step S7 the control device 11 checks whether the gradient G is greater than 0. If this is the case, the control device 11 recognizes in a step S8 that a phase transformation from an austenitic to a ferritic structure takes place during the rolling of the sections 10 of the strip 2 in the rolling stand 3 under consideration.
  • the control device 11 recognizes in a step S9 that no phase transformation from an austenitic to a ferritic structure takes place during the rolling of the sections 10 of the strip 2 in the rolling stand 3 under consideration.
  • ferritic structure i.e. the structure is either purely austenitic or purely ferritic. The following explains how to decide whether the structure is purely austenitic or purely ferritic.
  • step S10 the control device 11 checks whether the rolling of the strip 2 is completed. Depending on the result of the check, the control device 11 returns to step S1 or the procedure of FIG 3 is closed.
  • FIG 3 The approach of FIG 3 is based on the following, hereinafter in connection with FIG 5 explained physical effect: At a high temperature T of the strip 2, rolling with an austenitic structure (in FIG 5 marked by “A”).
  • the rolling force FW increases as the temperature T decreases and the conditions remain otherwise unchanged (in particular the material of the strip 2, rolling speed, setting of the rolling stand 3, thickness of the strip 2 before rolling and pass reduction). If the temperature falls below an upper limit T1, a phase transformation of the structure from austenite to ferrite occurs. This means that there is a mixture of austenite and ferrite (in FIG 5 marked by "A+F"). The proportion of ferrite increases with decreasing temperature T.
  • the rolling force FW required for rolling decreases with otherwise unchanged conditions despite a reduction in temperature T.
  • the rolling force FW decreases until the phase transformation from austenite to ferrite is complete or at least almost complete at a lower limit temperature T2. After that, the rolling force FW increases again with a further decreasing temperature T and otherwise unchanged conditions.
  • the corresponding range is shown in FIG 5 marked with "F".
  • FIG 5 shows a corresponding possible progression of the rolling force FW as a function of the temperature T from the completely austenitic to the completely ferritic range. The exact progression depends on many factors, for example the chemical composition of the steel and partly also on its pretreatment. However, the systematic progression, i.e. in particular a reversal of the sign of the gradient G in the mixed ferritic/austenitic range, is typical.
  • FIG 6 shows purely as an example the temperature range TB3 for the penultimate rolling stand 3 of the rolling mill 1.
  • the small crosses in FIG 6 each represent a single pair of values, as characterized by the respective temperature change ⁇ T and the associated rolling force FW. It is clear that a straight line that fits as well as possible and its slope can be determined - for example by linear regression.
  • the slope is the gradient G that is being sought, whereby the sign of the gradient G is less important in this case than the amount.
  • the procedure can be FIG 3 within a sequence of rolling passes for several rolling passes carried out one after the other, for example in the case of the multi-stand rolling mill of FIG 1 for each rolling stand 3 of the rolling mill.
  • it can be determined by comparing the gradients G determined for the individual rolling passes at which of the rolling passes a phase transformation from an austenitic to a ferritic structure occurs for the first time and/or at which of the rolling passes a phase transformation from an austenitic to a ferritic structure occurs for the last time.
  • a possible procedure for such a determination is described below in connection with FIG 7 explained in more detail.
  • n is the number of rolling passes.
  • the number of rolling passes in the multi-stand rolling mill corresponds to the number of rolling stands 3.
  • i and k are indices which select rolling passes.
  • A is calculated analogously to FIG 5 used as an abbreviation for austenite, F as an abbreviation for ferrite.
  • control device 11 initially assumes in a step S11 for all rolling passes/rolling stands 3 that the rolling is carried out austenitically (A). However, this determination is initially only provisional.
  • step S12 the control device 11 sets the index k to the value 0.
  • step S13 the control device 11 increases the index by 1.
  • step S14 the control device 11 checks whether the index k is greater than the number n of rolling passes. If this is the case, the determination of FIG 7 completed. Thus In a step S15, further steps based on the determination of FIG 7 constructive measures should be taken.
  • step S16 the control device 11 checks whether the gradient G determined for the rolling pass determined by the index k is greater than 0. If this is the case, the control device 11 assumes for all rolling passes from rolling pass k that the rolling takes place with a phase transformation, i.e. austenitic and ferritic (A+F). Here too, the determination for the rolling passes from the kth rolling pass is initially only provisional. For the rolling passes before the kth rolling pass, however, the previous determination in step S11 becomes final. Starting from step S17, the control device 11 goes back to step S13.
  • A+F austenitic and ferritic
  • step S18 the control device 11 checks whether it has already assumed for the rolling pass determined by the index k that the rolling takes place with a phase transformation, i.e. whether it has already made the change from purely austenitic to mixed austenitic-ferritic rolling for this rolling pass in step S17. If this is not the case, the control device 11 goes back to step S13. Otherwise, in step S19, the control device 11 assumes for all rolling passes from the kth rolling pass onwards that the rolling takes place purely ferritic (F). The determination of the type of rolling (purely austenitic, purely ferritic or mixed) for all rolling passes is now complete and thus final.
  • the control device 11 can determine the rolling pass in the sequence of rolling passes in which a phase transformation from an austenitic to a ferritic structure occurs for the first time. Alternatively or additionally, the control device 11 can determine the rolling pass in the sequence of rolling passes in which a phase transformation from an austenitic to a ferritic structure occurs for the last time. Based on the procedure of FIG 7 The control device 11 can thus, for example, be operated as shown in FIG 8 determine the corresponding rolling pass in a step S21. In a step S22, the control device 11 can then check whether the rolling pass found corresponds to a predetermined rolling pass, for example the first rolling pass in the sequence of rolling passes, the third rolling pass in the sequence of rolling passes or the last rolling pass in the sequence of rolling passes. Depending on the check in step S22, the control device 11 can therefore vary operating parameters of the rolling mill 1 in a step S23 if this should be necessary.
  • a predetermined rolling pass for example the first rolling pass in the sequence of rolling passes, the third rolling pass in the sequence of rolling passes
  • the variation of the operating parameters is possible regardless of whether one and the same rolling stand 3 carries out several rolling passes in succession or whether each rolling stand 3 only one rolling pass is carried out. In both cases, by varying the operating parameters, it is possible to ensure that the rolling pass in which a phase transformation from an austenitic to a ferritic structure occurs for the first or last time is a predetermined rolling pass in the sequence of rolling passes.
  • the rolling stand in which a phase transformation from an austenitic to a ferritic structure occurs for the first time and/or the rolling stand in which a phase transformation from an austenitic to a ferritic structure occurs for the last time - they can be adjusted in such a way that a specified energy consumption of the rolling mill 1 is minimized, a productivity of the rolling mill 1 is maximized, a rolling force FW of at least one of the rolling passes is reduced and/or a product property of the strip 2 is optimized after the sequence of rolling passes has been carried out.
  • control device 11 it is possible for the control device 11 to check for a specific rolling pass in a step S31 whether the respective rolling pass in the rolling stand 3 is carried out ferritically. If this is the case, the control device 11 can, for example, in a step S32, adapt a model of the rolling of the strip 2 in a manner specific to ferritic rolling. If this is not the case, the control device 11 can check for this rolling pass in a step S33 whether the rolling pass is carried out austenitically. If this is the case, the control device 11 can, for example, in a step S34, adapt a model of the rolling of the strip 2 in a manner specific to austenitic rolling.
  • the present invention has many advantages. The most important advantage is that - in contrast to the prior art procedures - modeling with all its uncertainties is no longer necessary, but rather it can be determined on the basis of measured data whether a phase transformation is present or not. Austenitic rolling takes place before the phase transformation, and ferritic rolling takes place after the phase transformation. Furthermore, the present invention can be used in a wide range of ways, in particular both for rolling slabs separately from the casting process and for rolling from the casting heat.

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  • 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 Metal Rolling (AREA)
EP22205487.6A 2022-11-04 2022-11-04 Laminage d'acier avec détection technique de mesure de la conversion de phase Pending EP4364867A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22205487.6A EP4364867A1 (fr) 2022-11-04 2022-11-04 Laminage d'acier avec détection technique de mesure de la conversion de phase
PCT/EP2023/079566 WO2024094475A1 (fr) 2022-11-04 2023-10-24 Laminage d'acier avec détection mesurée de la transition de phase

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EP22205487.6A EP4364867A1 (fr) 2022-11-04 2022-11-04 Laminage d'acier avec détection technique de mesure de la conversion de phase

Publications (1)

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EP4364867A1 true EP4364867A1 (fr) 2024-05-08

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EP (1) EP4364867A1 (fr)
WO (1) WO2024094475A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19600990A1 (de) * 1996-01-14 1997-07-17 Thyssen Stahl Ag Verfahren zum Warmwalzen von Stahlbändern
DE102007058709A1 (de) * 2007-08-04 2009-02-05 Sms Demag Ag Verfahren zum Herstellen eines Bandes aus Stahl
US8145346B2 (en) * 2006-10-09 2012-03-27 Siemens Aktiengesellschaft Method for monitoring a physical state of a hot-rolled sheet while controlling a rolling train for reverse rolling the hot-rolled sheet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19600990A1 (de) * 1996-01-14 1997-07-17 Thyssen Stahl Ag Verfahren zum Warmwalzen von Stahlbändern
US8145346B2 (en) * 2006-10-09 2012-03-27 Siemens Aktiengesellschaft Method for monitoring a physical state of a hot-rolled sheet while controlling a rolling train for reverse rolling the hot-rolled sheet
DE102007058709A1 (de) * 2007-08-04 2009-02-05 Sms Demag Ag Verfahren zum Herstellen eines Bandes aus Stahl

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELSNER ALEXANDER: "Advanced hot rolling strategies for IF and TRIP steels", 1 January 2005 (2005-01-01), Delft, pages 1 - 159, XP055873677, ISBN: 978-90-40-72591-3, Retrieved from the Internet <URL:https://repository.tudelft.nl/islandora/object/uuid:70d0c634-8f18-4576-96bc-1c81ebadcaef/datastream/OBJ/download> [retrieved on 20230403] *

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