WO2024037839A1 - Procédé de fabrication de bandes métalliques par coulée et laminage en continu - Google Patents

Procédé de fabrication de bandes métalliques par coulée et laminage en continu Download PDF

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Publication number
WO2024037839A1
WO2024037839A1 PCT/EP2023/070506 EP2023070506W WO2024037839A1 WO 2024037839 A1 WO2024037839 A1 WO 2024037839A1 EP 2023070506 W EP2023070506 W EP 2023070506W WO 2024037839 A1 WO2024037839 A1 WO 2024037839A1
Authority
WO
WIPO (PCT)
Prior art keywords
slab
smoothing
heat treatment
thickness
rollers
Prior art date
Application number
PCT/EP2023/070506
Other languages
German (de)
English (en)
Inventor
Ralf Setzer
Bernhard Ehls
Ingo Schuster
Wolfgang RÖDER
Original Assignee
Sms Group 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 Sms Group Gmbh filed Critical Sms Group Gmbh
Publication of WO2024037839A1 publication Critical patent/WO2024037839A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling

Definitions

  • the invention relates to a method for producing metallic strips using casting rolls, in which a slab is first cast in a casting machine, the slab being cleaned in a cleaning device in the conveying direction behind the casting machine and the slab is then subjected to a heat treatment in a heat treatment device, the Slab between the cleaning device and the heat treatment device is subjected to a smoothing process by means of two interacting smoothing rollers.
  • the slab is either already in the area of the casting machine, i.e. before it enters the furnace. H. subjected to a relevant thickness reduction when the core of the casting strand is still liquid, or between the casting machine and the furnace in a roughing stand.
  • the technological focus here is on improving the profile or geometry of a cast strip or a very thin slab.
  • the invention is based on the task of developing a method of the type mentioned in such a way that the problem mentioned is eliminated.
  • energy and production costs should be reduced, which should be achieved by specifically influencing the slab and strip edge geometry.
  • the surface of the slabs should be improved before the first forming.
  • the solution to this problem by the invention is characterized in that the smoothing process is carried out in such a way that the slab does not experience a significant reduction in thickness and the roughness of the smoothed surfaces of the slab is reduced.
  • the average roughness value of the rolled surfaces of the slab after smoothing is preferably at most 10 pm, particularly preferably at most 8 pm. This means that the average roughness value is reduced compared to the usual value when casting from a mold (approx. 11 pm to 14 pm).
  • the slab is preferably subjected to the smoothing process in a fully solidified state.
  • the reduction in thickness of the slab during the smoothing process is preferably less than 10%, particularly preferably less than 5% and most preferably less than 3%.
  • the smoothing process is carried out with two cooperating smoothing rollers, which preferably exert a force acting normally on the slab between 3,000 kN and 5,000 kN, and particularly preferably between 3,500 kN and 4,500 kN.
  • the smoothing process with the two interacting smoothing rollers is preferably carried out in such a way that smoothing roller diameters between 500 mm and 700 mm, preferably between 550 mm and 650 mm, are provided.
  • the cleaning process in the cleaning device is preferably a descaling process, in particular by fluid descaling or scarfing.
  • the smoothing rollers can be cooled during the smoothing process.
  • the smoothing process is preferably carried out at a speed between 1.0 and 6.0 m/min.
  • the proposed method is therefore used in particular when casting and rolling hot slabs in order to prepare the surfaces of the slab before entering the furnace.
  • the surfaces of the solidified slab that emerges from the casting machine are smoothed.
  • the central aspect of the invention is the smoothing of the surface of the casting strand or the slab, with cleaning, in particular descaling (e.g. by fluid descaling, flame cleaning or gas cleaning), taking place beforehand and the cleaned slab surface being smoothed by a pair of rollers.
  • cleaning in particular descaling (e.g. by fluid descaling, flame cleaning or gas cleaning)
  • the cleaned slab surface being smoothed by a pair of rollers.
  • the planned smoothing process by using the pair of smoothing rollers only smoothes the surface tips of the slab and thus reduces the surface roughness, so that a surface that is as flat as possible is created.
  • the reduction in thickness of the slab resulting from the application of force is less than 10%, preferably less than 5% and particularly preferably less than 3%.
  • a thickness reduction of less than 1% can be provided during the smoothing process, only an elastic deformation takes place in the slab itself, which, however, causes the desired slight deformation (as explained above) due to the surface peaks there and is limited to the layer of the slab near the edge.
  • the pair of smoothing rollers used for the smoothing process described can be adjusted to the slab thickness.
  • the applied force can be adjusted using a process model.
  • the parameters for setting the smoothing rollers are transmitted via a control device.
  • the pair of smoothing rollers is therefore not a full-fledged rolling stand with corresponding actuators.
  • the pair of smoothing rollers can be moved in and out of the line. However, it can also remain stationary in the system.
  • the smoothing rollers are preferably cooled.
  • the pair of smoothing rollers can be housed together with a pair of scissors in a common frame. Furthermore, it can be provided that the scale scrubber is also integrated into this common frame.
  • the invention is preferably used with a slab thickness between 30 mm and 180 mm, particularly preferably with a slab thickness between 50 mm and 150 mm.
  • the planned preferred pressing force of the smoothing rollers of around 4,000 kN differs significantly from the otherwise planned forces. This force is too low for a desired reduction in the thickness of the slab, but on the other hand it is significantly above the force that is intended for the contact of drive rollers (this is only approx. 20% to 50% of the contact pressure of the intended roller contact pressure of the smoothing rollers).
  • the design of the operating parameters is of course also dependent on the bandwidth.
  • the preferred diameter of the smoothing rollers (approx. 600 mm) is also significantly larger than the typical drive rollers in the casting machine sector.
  • the design of the diameter and optionally the shape of the bale also depends on the bandwidth.
  • the arrangement of the smoothing rollers provided according to the invention is provided close to the outlet of the casting machine and can also be partially located below the casting platform.
  • the proposed procedure results in significant advantages, which initially lie in the reduction of scale formation, which results from the reduction in surface roughness and thus the avoidance of running marks on the slab.
  • Figure 1 shows a system according to the invention for producing metallic strips by casting rolls
  • Figure 2 shows an embodiment of a smoothing device
  • FIG. 3 shows a possible sequence of process steps in the process according to the invention
  • Figure 4b shows a schematic, greatly enlarged view of the surface structure of a slab that is treated according to the invention.
  • FIG. 1 shows a schematic representation of a front part of the casting-rolling system 1 according to the invention for producing metallic strips, in particular steel strips.
  • the system 1 initially comprises a casting device 2, via which slabs 3 with a thickness of 30 to 150 mm are cast, which are typically formed from the vertical to the horizontal via guide rollers, not shown.
  • the slabs 3 leaving the casting device 2 are so hot that an oxide layer in the form of scale immediately forms upon contact with atmospheric oxygen. This must be removed from the surface of the slabs 3 for the subsequent heat treatment.
  • the system 1 comprises a cleaning unit 4, which is arranged directly behind the casting device 2 in the strip running direction and has a first upper and a first lower scale washer 5, 6.
  • the majority of the scale that has already formed can be removed from the slab surface via the scale washers 5, 6 arranged above and below the slab 3.
  • the system 1 further comprises a separating device 7 with two scissors 8, 9, via which the slab 3 is optionally divided before entering a heat treatment device 11.
  • the heat treatment device 11 is designed here as a roller hearth furnace 11.
  • the roller hearth furnace 11 serves both for reheating and for equalizing the slab temperature.
  • the system 1 comprises a smoothing device 12 arranged between the cleaning device 4 and the separating device 7 with an upper and a lower drivable smoothing roller 13, 14. Both smoothing rollers 13, 14 are spaced apart from one another in such a way that a smoothing stitch is produced on the cleaned slabs 3 is feasible.
  • the smoothing stitch on the one hand, smoothes the surface of the slab 3 and, on the other hand, effectively breaks up the scale that cannot be removed via the upstream scale washers 5, 6.
  • This is then removed via a second cleaning unit 15, which is connected downstream of the separating device 7 and has a second upper and a second lower scale washer 16, 17, so that an almost scale-free divided slab 10 can be fed to the roller hearth furnace 11.
  • the distance between the two smoothing rollers 13, 14 is set in such a way that the slabs 3 experience a thickness reduction of at least 3.0% and a maximum of 5.0% according to a possible embodiment of the invention, this being kept constant between the two smoothing rollers 13, 14 throughout the entire process becomes.
  • the system 1 can include a force and/or position control device (not shown), via which a hydraulic and/or mechanical device (not shown) of the casting device 2 can be controlled.
  • the smoothing device 12 comprises the two smoothing rollers 13, 14 arranged in a stand 19 and a force measuring sensor 20 arranged on the operating and drive sides, by means of which the forces across the slab width can be determined.
  • useful information about the shape of the slabs such as in particular the thickness and/or the wedgeness, can be obtained at an early stage of the process, which can be forwarded to the casting device 2 and/or to the subsequent rolling train via appropriate signaling systems, to optimize the rolling process overall.
  • the cleaning units 4, 15, the separating device 7 and the smoothing device 12 arranged between them can be designed in the form of a unit 18 (see FIG. 1).
  • step 3 shows the sequence of the individual process steps as they can be provided in the process according to the invention.
  • the casting strand or slab is produced in the casting machine in step A.
  • step B inductive heating of the slab can be provided.
  • the slab then enters the cleaning device or the scale washer in step C.
  • step D the slab can then be separated into individual pieces.
  • step E the central smoothing of the surface of the slab according to the invention takes place by means of the smoothing rollers 13 and 14.
  • step F the further transport or heating of the pretreated slabs in the oven then takes place.
  • step E smoothing
  • step D separating
  • the first cleaning unit 4, the separating device 7 and the smoothing device 12 arranged between them are preferably designed as a unit 18.
  • At least One of the two smoothing rollers 13, 14 of the smoothing device 12 can include a force measuring sensor 20 on the operating and/or drive side, by means of which the force across the slab width can be determined.
  • the heat treatment device 11 can be designed as a roller hearth furnace and/or as an induction heater.
  • the slab surface is thus evened out before the separating device or the possible separating step but after the cleaning unit or after the cleaning step by smoothing the two surfaces, i.e. the top and bottom of the slab, using the smoothing stitch.
  • the local roughness peaks are thereby reduced to such an extent that the formation of undesirable track grooves is effectively avoided and the transport processes in the heat treatment device are thus improved.
  • the smoothing stitch leads to reduced scale formation on the two surfaces of the slab as soon as it leaves the heat treatment device and is fed to the rolling train. In this respect, it can be assumed that this effect is based on the reduction of the active surface on which the scale preferentially forms. This reduction in scale formation has a positive effect on the output of the system by reducing material losses due to scale formation, which later has to be removed.
  • the cleaning device which is designed in the form of scale washers
  • a large part of the scale that has already formed is removed from the surfaces of the slab before the separating device.
  • the part of the scale that cannot be removed using the scale scrubber can be effectively broken up using the smoothing stitch using the proposed method, which leads to a higher heat transfer and thus a more effective heat treatment process.
  • the separating device can be in the form of scissors and/or a laser-based cutting device.
  • the term “smoothing device” means a device with two driven smoothing rollers, which are arranged at a defined distance from one another. It is therefore preferably provided that the system between the casting device and the heat treatment device does not include a rolling train.
  • the smoothing stitch is characterized by a particularly small reduction in thickness and can therefore be distinguished from a classic rolled stitch. It is therefore preferably provided that the distance between the two smoothing rollers or the gap between them is designed such that the smoothing stitch has a thickness reduction of a maximum of 5.0% based on the thickness of the incoming slab, more preferably a thickness reduction of 3.0 to 5 .0% based on the thickness of the incoming slab. In other words, the gap between the two smoothing rollers is set so that it is slightly smaller than the incoming slab.
  • the system advantageously comprises a force and/or position control device, via which a hydraulic and/or mechanical device of the casting device can be controlled.
  • a second cleaning device is arranged between the separating device and the heat treatment device, which is particularly preferably designed in the form of scale washers.
  • the remaining loose scale can be removed via the scale washers arranged behind the separating device in the direction of strip travel Scale is removed from the surface of the slabs before they are then subjected to heat treatment.
  • the first cleaning unit, the separating device and the smoothing device arranged between them are designed in the form of a unit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention concerne un procédé de fabrication de bandes métalliques par coulée et laminage en continu, dans lequel une brame (3) est d'abord coulée dans une machine de coulée (2). La brame (3) est nettoyée dans un dispositif de nettoyage (4) placé après la machine de coulée (2) dans la direction de transport, et la brame (3) subit ensuite un traitement thermique dans un dispositif de traitement thermique (11), la brame (3) subissant, entre le dispositif de nettoyage (4) et le dispositif de traitement thermique (11), un processus de lissage au moyen de deux rouleaux de lissage en interaction. Afin de réduire les coûts d'énergie et de production et d'améliorer la surface des brames avant le premier processus de formage, selon l'invention, le processus de lissage est réalisé de telle sorte que la brame (3) ne subit pas une réduction substantielle de l'épaisseur, et la profondeur de rugosité de la surface lissée de la brame (3) est réduite.
PCT/EP2023/070506 2022-08-16 2023-07-25 Procédé de fabrication de bandes métalliques par coulée et laminage en continu WO2024037839A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022208498.5A DE102022208498A1 (de) 2022-08-16 2022-08-16 Verfahren zum Herstellen metallischer Bänder durch Gießwalzen
DE102022208498.5 2022-08-16

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Publication Number Publication Date
WO2024037839A1 true WO2024037839A1 (fr) 2024-02-22

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PCT/EP2023/070506 WO2024037839A1 (fr) 2022-08-16 2023-07-25 Procédé de fabrication de bandes métalliques par coulée et laminage en continu

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DE (1) DE102022208498A1 (fr)
WO (1) WO2024037839A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10137944A1 (de) 2001-08-07 2003-02-20 Sms Demag Ag Warmwalzanlage
DE102005059692A1 (de) 2005-12-14 2007-06-21 Sms Demag Ag Verfahren zum Stranggießen dünner Metallbänder und Stranggießanlage
DE102007022931A1 (de) 2006-05-26 2007-11-29 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Stranggießen
WO2008113848A1 (fr) 2007-03-21 2008-09-25 Danieli & C. Officine Meccaniche S.P.A. Procédé et usine pour la production de bandes de métal
US20080251232A1 (en) 2005-10-21 2008-10-16 Danieli & Officine Meccaniche S.P.A. Process and Plant For Producing Metal Strip
DE102008029581A1 (de) 2007-07-21 2009-01-22 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen von Bändern aus Silizum-Stahl oder Mehrphasenstahl
DE102008020412A1 (de) * 2007-08-24 2009-02-26 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Gießwalzen
JP2018061999A (ja) 2016-10-14 2018-04-19 新日鐵住金株式会社 圧延前ピンチロール装置、及び圧延前ピンチロール方法
CN213495668U (zh) 2020-09-28 2021-06-22 广东国鑫实业股份有限公司 一种粗轧前夹送辊

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10137944A1 (de) 2001-08-07 2003-02-20 Sms Demag Ag Warmwalzanlage
US20080251232A1 (en) 2005-10-21 2008-10-16 Danieli & Officine Meccaniche S.P.A. Process and Plant For Producing Metal Strip
DE102005059692A1 (de) 2005-12-14 2007-06-21 Sms Demag Ag Verfahren zum Stranggießen dünner Metallbänder und Stranggießanlage
DE102007022931A1 (de) 2006-05-26 2007-11-29 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Stranggießen
WO2007137740A1 (fr) * 2006-05-26 2007-12-06 Sms Demag Ag Procédé et dispositif permettant de produire une bande métallique par coulée continue
WO2008113848A1 (fr) 2007-03-21 2008-09-25 Danieli & C. Officine Meccaniche S.P.A. Procédé et usine pour la production de bandes de métal
DE102008029581A1 (de) 2007-07-21 2009-01-22 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen von Bändern aus Silizum-Stahl oder Mehrphasenstahl
US20100116380A1 (en) 2007-07-21 2010-05-13 Juergen Seidel Process and device for producing strips of silicon steel or multiphase steel
DE102008020412A1 (de) * 2007-08-24 2009-02-26 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Gießwalzen
JP2018061999A (ja) 2016-10-14 2018-04-19 新日鐵住金株式会社 圧延前ピンチロール装置、及び圧延前ピンチロール方法
CN213495668U (zh) 2020-09-28 2021-06-22 广东国鑫实业股份有限公司 一种粗轧前夹送辊

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