EP4003623A1 - Fabrication d'une bande d'acier pouvant être emboutie dans une installation combinée de coulée et de laminage - Google Patents

Fabrication d'une bande d'acier pouvant être emboutie dans une installation combinée de coulée et de laminage

Info

Publication number
EP4003623A1
EP4003623A1 EP20734583.6A EP20734583A EP4003623A1 EP 4003623 A1 EP4003623 A1 EP 4003623A1 EP 20734583 A EP20734583 A EP 20734583A EP 4003623 A1 EP4003623 A1 EP 4003623A1
Authority
EP
European Patent Office
Prior art keywords
rolling
strip
train
finishing
temperature
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
EP20734583.6A
Other languages
German (de)
English (en)
Inventor
Sergey BRAGIN
Simon Grosseiber
Thomas Lengauer
Bernd Linzer
Axel RIMNAC
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
Original Assignee
Primetals Technologies Austria 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 filed Critical Primetals Technologies Austria GmbH
Publication of EP4003623A1 publication Critical patent/EP4003623A1/fr
Pending legal-status Critical Current

Links

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
    • B22D11/12—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
    • 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
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
    • 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
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • 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
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • 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
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • B22D11/1265—Accessories for subsequent treating or working cast stock in situ for cutting having auxiliary devices for deburring
    • 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
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing

Definitions

  • the present invention relates to the technical field of metallurgy.
  • the invention relates to a method for producing a deep-drawable finished strip made of steel in a composite casting and rolling plant by continuous casting and hot rolling.
  • the invention relates to a composite casting and rolling system suitable for this purpose.
  • Hot rolling in a conventional hot rolling mill or a casting-rolling compound plant set by pickling, subsequent cold rolling with high degrees of deformation and annealing.
  • the object of the invention is to modify the known processes for the production of thin steel strips so that a thin finished strip with good deep-drawability and high surface quality can be produced directly on a cast-roll compound system, without the finished strip necessarily having to be hot-rolled would have to be pickled and cold rolled.
  • Another Aspect of the invention is to find a compound casting and rolling system that is particularly suitable for this.
  • the solution takes the form of a process for the production of a finished steel strip in a composite casting and rolling system, comprising the process steps:
  • liquid steel being C ⁇ 0.01% (preferably C ⁇ 0.004%), Mn ⁇ 0.2%, P ⁇ 0.01%, optionally Ti + Nb 2 0.01%, the remainder contains Fe and any impurities (also called accompanying elements);
  • Pre-rolling train takes place in the austenitic range and the thickness of the strand is reduced by the pre-rolling by at least 30%, preferably at least 60%, particularly preferably at least 80%;
  • Finishing rolling train through several rolling passes to the finished strip with the finished strip having a thickness between 0.5 and 4 mm, preferably between 0.6 and 2 mm, after the last rolling pass
  • the compound casting and rolling system for carrying out the method according to the invention comprises at least one continuous caster for continuous casting of a strand, a roughing mill for roughing the strand into a pre-strip, a finishing mill with several finishing stands for finishing rolling the pre-strip into a finished strip, and at least two
  • Winding devices for winding up the finished strip The pre-rolling train is designed with one or more stands.
  • liquid steel is first continuously cast into a strand with a slab or thin slab cross-section, the liquid steel being C ⁇ 0.01% (preferably C ⁇ 0.004%), Mn ⁇ 0.2%, P ⁇ 0.01%, preferably Ti + Nb 2 0.01%, the remainder Fe and any impurities or
  • Pre-strip is hot-rolled into finished strip by several rolling passes, the finished strip having a thickness between 0.5 and 4 mm, preferably between 0.6 and 2 mm, after the last rolling pass.
  • the finished strip is cut transversely and wound up in one of the at least two winding devices, the ferrite in the finished strip at least partially forming a ⁇ 1 1 1 ⁇ texture.
  • ⁇ 1 1 1 ⁇ texture of the ferrite is responsible for ensuring that the finished strip is easy to deep-draw. Basically, the more ferrite with the ⁇ 1 1 1 ⁇ texture there is in the finished strip, the better the deep-drawability.
  • the liquid steel contains Ti and / or Nb, the sum of these alloying elements Ti + Nb 2 being 0.01%, the finished strip achieves a further improved deep drawing ability, since a ferritically rolled, titanium and / or niobium alloyed finished strip has a higher proportion of Having ferrite with the ⁇ 1 1 1 ⁇ texture.
  • the addition of Ti and / or Nb can be dispensed with for subordinate requirements. Continuous operation in the compound casting and rolling system ensures optimum process stability and, as a result, uniform strip geometry and mechanical properties.
  • the roll gap has a low ratio of compressed length and mean roll gap height. This is achieved in that the diameter of the work rolls in the last rolling pass, preferably in several of the final rolling passes, particularly preferably in all rolling passes, in the finishing rolling train is between 200 mm and 750 mm, preferably 200 mm to 500 mm.
  • Frictional stresses in the roll gap are advantageous if the coefficient of friction m between the work rolls and the rolling stock in the last rolling pass, preferably in several of the final rolling passes, particularly preferably in all rolling passes, in the finishing rolling train m 2 is 0.15. This can be achieved through roll gap lubrication and / or through particularly smooth surfaces of the work rolls. According to the invention, roll gap lubrication is provided, since a coefficient of friction m 2 0.15 cannot otherwise be guaranteed in the case of longer rolling campaigns of more than 150 km rolled length.
  • the degree of deformation of the first pass in the finishing train is greater than the degree of deformation of the last pass, or all passes show a degressive course of deformation, i.e. the degree of deformation of an earlier pass is greater than the degree of deformation of a later pass.
  • the temperature of the pre-strip when exiting the roughing train 2 is 900 ° C
  • the temperature of the finished strip when leaving the finishing train is between 700 and 800 ° C
  • the winding temperature is> 680 ° C.
  • the winding temperature can also be 2,670 ° C.
  • ferritic rolling it is advantageous if the distance between the last stand of the finishing train and the winding device is small, since this keeps the temperature drop low. Alternatively or additionally, it is advantageous to reduce the temperature drop of the finished strip between the last stand of the finishing train and the winding device
  • the insulating panels are preferably designed so that they can be installed or removed from the cooling section, so that they are only used for ferritic rolling. According to option 2, the temperature of the pre-strip when exiting the
  • Pre-rolling mill 2 900 ° C, the temperature of the finished strip at
  • option 2 it is advantageous to subject the finished strip to a recrystallization annealing after winding.
  • the recrystallization annealing leads to the formation of new grains in the ferritic structure.
  • option 1 is that recrystallization annealing is not required.
  • the sliver is first after heating
  • the pre-strip is descaled before or after cooling.
  • the powder can, for example, be a borate, in particular a salt of boric acid, particularly preferably a sodium salt of boric acid, very particularly preferably borax with or without
  • Water of crystallization such as Anhydrous borax (Na2B407), Borax pentahydrate (Na2B407 -5H20) or Borax decahydrate (Na2B407 ⁇ IOH2O), or the powder contains at least one of these compounds.
  • the finished tape a.a.O.
  • the object according to the invention is also achieved by a composite casting / rolling system according to claim 12, the composite casting / rolling system having:
  • a descaling device for descaling the heated pre-strip
  • a roll gap lubrication for the last rolling pass preferably for several of the final rolling passes, particularly preferred for all rolling passes, in the finishing rolling train, whereby the friction between the work rolls of a finishing stand and the rolling stock is reduced to m ⁇ 0.15;
  • a pyrometer for measuring an actual temperature of the rolling stock is arranged between the first stand and the second stand of the finishing rolling train, the pyrometer is connected to a controller, the controller below Taking into account the actual temperature Ti st and a target temperature Ts oii, a manipulated variable is calculated, and the controller is an actuator for intensive cooling (eg a valve or a
  • Water pump controls such that the actual temperature Ti st corresponds to the target temperature T Soii as possible.
  • the pyrometer in front of the finishing train or after the first stand of the finishing train.
  • the arrangement between the first and the second framework is preferred.
  • the target temperature T Soii is preferably ⁇ 850 ° C in ferritic rolling.
  • T Soii is basically dependent on the steel grade.
  • Fig. 2 is a schematic representation of a non
  • FIG. 5 shows a variant of a composite casting and rolling system according to the invention for carrying out the method according to the invention.
  • Table 1 Chemical composition of the steel continuously cast into a strand 3 with a slab cross section.
  • the strand 3 leaves the continuous caster 2 with a thickness of 110 mm and a speed of 6 m / min.
  • the partially solidified strand 3 is preferably subjected to a soft core or a liquid core reduction (LCR) in the curved strand guide.
  • LCR liquid core reduction
  • the strand 3 enters the three-stand roughing train 5 uncut and is there reduced to a roughing strip 4 with a thickness of 10 mm.
  • the last rolling pass in stand R3 of roughing train 5 takes place in austenitic
  • the temperature of the pre-strip 4 is then set by a
  • Induction furnace IH heated to 1080 ° C and then the
  • Intensive cooling 7 cooled to 850 ° C.
  • the austenite present in the pre-strip 4 is at least almost completely converted into ferrite.
  • the endless, phase-converted preliminary strip 4 then enters the five-stand finishing rolling train 8 and is there finish-rolled in 5 passes to form a finished strip 6 with a thickness of 1 mm.
  • the last three rolling passes in the roll stands F3, F4 and F5 of the finishing train 8 are carried out using roll gap lubrication.
  • a mineral oil is sprayed on between the work rolls of a finishing stand and the rolling stock, which reduces the coefficient of friction in the roll gap to a value of m ⁇ 0.15. This prevents shear bands, which lead to the development of an undesirable GOSS texture, from forming in the finished band.
  • the finished strip 6 leaves the finishing train 8 with a surface temperature of 720 ° C.
  • the finished strip is Area of the cooling section 9 shown in dashed lines is not cooled, but thermally insulated by insulating panels 14.
  • the finished tape is divided transversely by the scissors 10 before being wound up.
  • the winding temperature is 690 ° C.
  • the endless finished strip is cut transversely by the scissors 10 and the winding continues on a further winding device (not shown in FIG. 1), the ferrite in the finished strip 6 at least partially having a ⁇ 1 1 1 ⁇ texture trains.
  • the descaling of the pre-strip 4 can be dispensed with, since the top and bottom of the strand 3 in the powder feeder 15 are covered with a powder (e.g. borax) that hinders the scaling.
  • a powder e.g. borax
  • FIGS. 3 and 4 three further variants, named VI to V3, of operating methods for producing a finished strip 6 from steel on a composite casting and rolling plant 1 are shown.
  • Variants VI and V2 according to the invention are carried out on the composite casting / rolling system 1 according to FIG. 1; the non-fiction, contemporary variant V3 on the composite casting and rolling system 1 according to FIG.
  • the pre-strip 4 passing through the inactive induction furnace IH is fed directly to the first stand Fl of the finishing train 8 without being heated, without being cooled by intensive cooling 7 and without being descaled in the descaling device D.
  • the thin slab strand 3 leaves the continuous caster 2 at a casting speed of 6 m / min and a temperature of 1100 ° C. Since the pre-rolling train 5 directly follows the continuous caster 2, the uncut thin slab strand also enters the first stand RI of the pre-rolling train 5 at 1100 ° C and becomes a pre-strip 4 with a thickness of in the three stands R1 ... R3 of the pre-rolling train 5 12.4 mm rough rolled. The last pass in stand R3 of roughing train 5 takes place at 1000 ° C and thus in the austenitic temperature range of the steel. The pre-rolling reduces the thickness of the strand by 86%.
  • the pre-strip 4 is then heated to 1100 ° C. in the induction furnace IH and then descaled in the descaling device D.
  • the temperature of the pre-strip 4 drops to 1000 ° C. in the process.
  • the sliver is then intensively cooled in the intensive cooling system 7, the temperature of the sliver 4 falling to below 900 ° C.
  • the pre-strip 4 is neither heated in the induction furnace IH nor descaled in the descaling device D. It would just as well be possible to omit the induction furnace IH and the descaling device D. As shown above, the scaling of the strand or the pre-strip can be reduced or prevented by using a covering powder. In this case it has
  • Process has high energy efficiency and the finished strip has a high surface quality.
  • the finished strip is thermally insulated by insulating panels 14 in the area of the cooling section 9.
  • the first rolling pass takes place in the first stand F1 of the finishing train 8 at 840 ° C.
  • the last rolling pass in the fifth stand F5 takes place at a final rolling temperature of 700 ° C.
  • the finished strip 6 with a thickness of 1.7 mm is cooled slightly in the cooling section 9 and wound onto the winding device DC at a winding temperature of 550 ° C.
  • the thickness of the pre-strip is reduced by 86% by finish rolling.
  • the finished strip 6 is cut directly in front of the winding devices and alternately wound by at least two winding devices DC.
  • the wound finished strip 6 has good deep-drawability without the finished strip 6 having to be cold-rolled or annealed after hot rolling. Since the finished strip in the V2 and V3 versions is wound at a relatively low temperature, there is none in the coil itself
  • the finished strip should subsequently be subjected to a recrystallization annealing.
  • the method according to the invention is extremely advantageous, since the cold-rolling can take place at lower reduction rates. The good deep-drawability results on the one hand from the brazen. Composition of the liquid steel and the advantageous application of the method according to the invention.
  • FIG. 5 shows a variant of the composite casting and rolling installation 1 according to the invention from FIG.
  • the intensive cooling 7 is operated with temperature control.
  • the actual surface temperature Ti st after the first stand of the finishing rolling train 8 is measured by a pyrometer or a temperature measuring device and transmitted to the controller C.
  • the controller C determines a manipulated variable as a function of a desired surface temperature Ts oii and the actual surface temperature Ti st and sends the manipulated variable to an actuator 13, here one
  • Frequency converter off.
  • the frequency converter controls the speed of the pump 11 via the electric motor 12. Since the pump 11 is a centrifugal pump, the pressure of the changes liquid coolant, which is sprayed via nozzles onto the top and bottom (in FIG. 5, only nozzles below the pre-strip are shown for reasons of clarity) of the pre-strip, depending on the pump speed.
  • the cooling intensity of the intensive cooling can thus be regulated as a function of the measured actual surface temperature Ti st .
  • Speed control of a pump also known other ways of adjusting the cooling intensity, e.g. by providing a valve between the pump and one or more nozzles, the flow rate or the pressure of the coolant being adjusted via the opening of the valve.
  • This measure ensures that even in the case of transient processes (e.g. a distributor change with a temporarily reduced casting speed of the continuous caster 2) in the compound casting and rolling system 1, the first rolling pass in the finishing train 8 is already in a predetermined ferritic phase area (typically fully ferritic)
  • the finished strip 6 is in turn thermally insulated in the area of the cooling section 9 by insulating panels 14.
  • FIGS. 1, 2 and 5 only a single winding device DC is shown for reasons of clarity. For longer rolling campaigns, however, at least two Wickelein directions are required in order to wind up the endlessly produced finished strip 6 can.

Landscapes

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

Abstract

L'invention concerne un procédé pour fabriquer une bande finie (6) en acier dans une installation combinée de coulée et de laminage (1) et une installation combinée de coulée et de laminage (1) adaptée à celui-ci. L'objet de l'invention est de mettre au point un procédé au moyen duquel une mince bande finie (6) présentant une aptitude satisfaisante à l'emboutissage et une qualité de surface élevée peut être fabriquée directement sur une installation combinée de coulée et de laminage, sans que la bande finie (6) nécessite forcément d'être décapée et laminée à froid après le laminage à chaud. Cet objectif est résolu par le procédé selon la revendication 1.
EP20734583.6A 2019-07-24 2020-07-01 Fabrication d'une bande d'acier pouvant être emboutie dans une installation combinée de coulée et de laminage Pending EP4003623A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19188015 2019-07-24
PCT/EP2020/068520 WO2021013488A1 (fr) 2019-07-24 2020-07-01 Fabrication d'une bande d'acier pouvant être emboutie dans une installation combinée de coulée et de laminage

Publications (1)

Publication Number Publication Date
EP4003623A1 true EP4003623A1 (fr) 2022-06-01

Family

ID=67438674

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19213778.4A Withdrawn EP3769862A1 (fr) 2019-07-24 2019-12-05 Procédé de fabrication d'une bande finie à emboutir d'acier dans une installation combinée de laminage en coulée continue
EP20734583.6A Pending EP4003623A1 (fr) 2019-07-24 2020-07-01 Fabrication d'une bande d'acier pouvant être emboutie dans une installation combinée de coulée et de laminage

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19213778.4A Withdrawn EP3769862A1 (fr) 2019-07-24 2019-12-05 Procédé de fabrication d'une bande finie à emboutir d'acier dans une installation combinée de laminage en coulée continue

Country Status (3)

Country Link
EP (2) EP3769862A1 (fr)
CN (1) CN114173957B (fr)
WO (1) WO2021013488A1 (fr)

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EP4015099A1 (fr) 2020-12-15 2022-06-22 Primetals Technologies Austria GmbH Fabrication efficace en énergie d'un feuillard à chaud ferritique dans une installation composite de coulée et de laminage
AT525563B1 (de) 2022-02-18 2023-05-15 Primetals Technologies Austria GmbH Trockengiessen in einer giess-walz-verbundanlage
CN115351081A (zh) * 2022-08-24 2022-11-18 中冶赛迪工程技术股份有限公司 一种无头连铸连轧生产超低碳钢卷的方法及生产线
DE102022128358A1 (de) * 2022-10-26 2024-05-02 Sms Group Gmbh Kühlmodul, Kühlgruppe, Kühlsystem, Verfahren, warmgewalztes metallisches bandförmiges Produkt und Verwendung
CN115716086B (zh) * 2022-12-09 2023-11-21 中冶南方工程技术有限公司 热轧超薄带钢无头连铸连轧生产机组及其生产方法

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Publication number Publication date
CN114173957A (zh) 2022-03-11
CN114173957B (zh) 2024-01-16
WO2021013488A1 (fr) 2021-01-28
EP3769862A1 (fr) 2021-01-27

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