EP3769862A1 - Procédé de fabrication d'une bande finie à emboutir d'acier dans une installation combinée de laminage en coulée continue - Google Patents

Procédé de fabrication d'une bande finie à emboutir d'acier dans une installation combinée de laminage en coulée continue Download PDF

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Publication number
EP3769862A1
EP3769862A1 EP19213778.4A EP19213778A EP3769862A1 EP 3769862 A1 EP3769862 A1 EP 3769862A1 EP 19213778 A EP19213778 A EP 19213778A EP 3769862 A1 EP3769862 A1 EP 3769862A1
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EP
European Patent Office
Prior art keywords
rolling
strip
train
finishing
finished
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.)
Withdrawn
Application number
EP19213778.4A
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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
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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 EP3769862A1 publication Critical patent/EP3769862A1/fr
Withdrawn legal-status Critical Current

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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
    • B22D11/12—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
    • 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
    • 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, specifically the production of a deep-drawable, hot-rolled finished steel strip in a composite casting and rolling plant.
  • Cast-roll compound systems are basically known to those skilled in the art, e.g. an Arvedi ESP system, an SMS CSP system or a Danieli QSP system. It is also known that thin or ultra-thin strips of the most varied steel grades can be produced in a particularly energy-efficient manner on compound casting and rolling systems.
  • the microstructure of the finished strip necessary for deep drawability is achieved by hot rolling in a conventional hot rolling mill or in a casting-rolling compound plant, by pickling, subsequent cold rolling with a high degree of deformation, annealing and, if necessary, galvanizing.
  • the object of the invention is to modify the known processes for the production of thin steel strips in such a way that a thin finished strip with good deep-drawability can be produced directly on a casting and rolling compound plant without the finished strip necessarily being pickled, cold-rolled and cold-rolled after hot rolling needs to be annealed.
  • the composite casting and rolling plant for carrying out the method according to the invention comprises at least one continuous casting plant for continuously casting a strand, a roughing mill for roughing the strand to form a roughing strip, a finishing mill with several finishing stands for finishing the Pre-strip to a finished strip, and at least one winding device for winding up the finished strip.
  • the roughing train comprises one or more roughing stands.
  • liquid steel is first continuously cast into a strand with a slab or thin slab cross-section, with the liquid steel C ⁇ 0.01% (preferably C ⁇ 0.004%), Mn ⁇ 0.2%, P ⁇ 0.01%, preferably Ti + Nb ⁇ 0.01%, the remainder contains Fe and any impurities or other accompanying elements (Percentages in each case in% by weight).
  • the endless strand is then rolled into a pre-strip in the roughing train, the last rolling pass in the roughing train taking place in the austenitic area and the thickness of the strand being reduced by at least 30%, preferably at least 60%, particularly preferably at least 80%, by the roughing .
  • the endless strand of the at least partially phase-converted preliminary strip is hot-rolled to the 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.
  • nip lubrication is preferred for the last pass, preferably for several of the subsequent passes (e.g.
  • the finished strip is wound up in the winding device, the ferrite in the finished strip at least partially forming a ⁇ 1 1 1 ⁇ texture.
  • the so-called ⁇ 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 ⁇ 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 ferrite with the ⁇ 1 1 1 ⁇ texture.
  • the addition of Ti and / or Nb can be dispensed with for subordinate requirements.
  • 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.
  • the coefficient of friction ⁇ between a work roll 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 is ⁇ ⁇ 0.15. This can be achieved through roll gap lubrication and / or through particularly smooth surfaces of the work rolls.
  • 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 at the exit from the pre-rolling train is ⁇ 900 ° C
  • the temperature of the finished strip at Exit from the finishing train between 700 and 800 ° C and the coiling temperature> 680 ° C
  • the temperature of the pre-strip at the exit from the roughing train is ⁇ 900 ° C
  • the temperature of the finished strip at the exit from the finishing train is ⁇ 750 ° C
  • the winding temperature is ⁇ 600 ° C.
  • option 2 it is advantageous to anneal the finished strip for recrystallization after winding.
  • option 1 recrystallization annealing is not required.
  • the sliver is descaled before finish rolling, it is typically necessary to heat the sliver, preferably inductively.
  • the pre-strip After heating, the pre-strip is descaled and optionally additionally intensively cooled by a liquid coolant (see “Power Cooling” from Primetals Technologies).
  • the pre-strip is descaled before or after cooling.
  • the descaling takes place before the intensive cooling.
  • Either the strand or the pre-strip is preferably covered with a powder that hinders scaling, so that the pre-strip enters the finishing rolling train fully or partially ferritically after active or passive 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 crystal water, such as anhydrous borax (Na 2 B 4 O 7 ), borax pentahydrate (Na 2 B 4 O 7 ⁇ 5H 2 O) or Borax decahydrate (Na 2 B 4 O 7 ⁇ 10H 2 O), or the powder contain at least one of these compounds.
  • a borate in particular a salt of boric acid, particularly preferably a sodium salt of boric acid, very particularly preferably borax with or without crystal water, such as anhydrous borax (Na 2 B 4 O 7 ), borax pentahydrate (Na 2 B 4 O 7 ⁇ 5H 2 O) or Borax decahydrate (Na 2 B 4 O 7 ⁇ 10H 2 O), or the powder contain at least one of these compounds.
  • the compound casting and rolling system 1 of the Fig 1 is in the continuous casting plant 2 liquid steel with the following chemical composition ⁇ i> Table 1: Chemical composition of the steel ⁇ /i> element Weight% C. ⁇ 0.004 Mn ⁇ 0.2 P ⁇ 0.01 Ti + Nb 0.03 Fe rest 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 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 the austenitic temperature range at a final rolling temperature of 950 ° C.
  • the temperature of the pre-strip 4 is then heated to 1050 ° C. by an induction furnace IH, and the temperature of the pre-strip is then cooled to 800 ° C. by descaling D and intensive cooling 7.
  • the austenite present in the preliminary strip 4 is largely or almost completely converted into ferrite.
  • the endless, partially phase-changed 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 ⁇ ⁇ 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 at a temperature of 720 ° C. and is wound into bundles in the winding device DC without being cooled by liquid in the subsequent cooling section.
  • the Winding temperature is 690 ° C.
  • the endless finished band is cut by the scissors 10 and wound onto another (in Fig 1 winding device (not shown) continued, the ferrite in the finished strip 6 at least partially forming a ⁇ 1 1 1 ⁇ texture.
  • the Fig 2 shows a second variant of a composite casting and rolling installation 1 for carrying out the method according to the invention.
  • FIGS 3 and 4 are three further variants, called V1 to V3, of operating methods for producing a finished strip 6 from steel on the compound casting-rolling system 1 of Fig 2 shown.
  • the variants V1 and V2 are on the cast-roll compound system 1 according to Fig 1 carried out; the variant V3 on the casting-rolling compound system 1 according to Fig 2 .
  • the pre-strip 4 heated in the induction furnace IH and descaled in the descaling device D is fed directly to the first stand F1 of the finishing train 8 without being further cooled by an intensive cooling 7.
  • the compound casting and rolling system 1 are the Fig 2 and the operating method V3 is further simplified.
  • liquid steel with the chem. Composition cast into a 90 mm thick thin slab strand 3.
  • 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 R1 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 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. It should be clear that the surface quality of the finished strip 6 may not meet expectations due to the omission of the descaling. On the other hand, high energy efficiency is more important than high surface quality for some applications. As shown above, the scaling of the strand or the pre-strip can be reduced or prevented by a powder. In this case, the method according to the invention has a high energy efficiency and the finished strip has a high surface quality.
  • the austenite in the pre-strip 4 is at least partially converted into ferrite. Subsequently, the at least partially phase-converted sliver 4 enters uncut into the first stand F1 of the finishing train 8.
  • the first rolling pass takes place in the first stand F1 of the finishing rolling train 8 at 875 ° C.
  • the last rolling pass in the fifth stand F5 of the finishing train 8 takes place at a final rolling temperature of 735 ° C.
  • the finished strip 6 with a thickness of 1.7 mm passes through the cooling section 9 without being cooled and is at a winding temperature of 690 ° C on the DC winding device wound up. It would also be possible to omit the cooling section 9, ie to arrange the winding devices DC immediately after the last stand F5 of the finishing rolling train 8. Since, however, mostly different products are produced on a composite casting and rolling system 1, a cooling section 9 is typically present.
  • 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 further 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 last three rolling passes in the rolling stands F3, F4 and F5 of the finishing train 8 are again carried out using roll gap lubrication.
  • the temperatures in the individual units of the composite casting and rolling system 1 according to variants V1 to V3 result from either Fig 4 or the following table: ⁇ i> Table 2: Temperature control ⁇ /i> Temperature [° C] V1 V2 V3 CCM Out 1100 1100 1100 R1 1100 1100 1100 R2 1050 1050 1050 R3 1000 1000 1000 IH In 900 900 900 IH Out 1100 1100 880 D. 1000 1000 870 F1 875 840 840 F2 840 805 805 F3 805 770 770 F4 770 735 735 F5 735 700 700 DC 690 550 550
  • the finished strip 6 is cut directly in front of the winding devices and alternately wound up 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 is wound at a relatively low temperature in the V2 and V3 variants, no recrystallization takes place in the coil itself. Therefore, the finished strip should subsequently be subjected to a recrystallization annealing. However, even if the finished strip 6 is still cold-rolled and annealed for higher requirements, the method according to the invention is extremely advantageous, since the cold-rolling can be carried out with lower reduction rates and the annealing time can be greatly shortened. The good deep-drawability results on the one hand from the chem. Composition of the liquid steel and the advantageous application of the method according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP19213778.4A 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 Withdrawn EP3769862A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19188015 2019-07-24

Publications (1)

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EP3769862A1 true EP3769862A1 (fr) 2021-01-27

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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

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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

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

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CN115716086A (zh) * 2022-12-09 2023-02-28 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
US11987859B2 (en) 2020-12-15 2024-05-21 Primetals Technologies Austria GmbH Energy-efficient production of a ferritic hot-rolled strip in an integrated casting-rolling plant

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AT525563B1 (de) * 2022-02-18 2023-05-15 Primetals Technologies Austria GmbH Trockengiessen in einer giess-walz-verbundanlage
CN115351081B (zh) * 2022-08-24 2025-07-01 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
DE102024113430A1 (de) * 2024-05-14 2025-11-20 Sms Group Gmbh Steuergerät, Transferbarkühlung, Walzanlage, Verfahren zum Betreiben einer Walzanlage und Computerprogrammprodukt

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Publication number Priority date Publication date Assignee Title
US11987859B2 (en) 2020-12-15 2024-05-21 Primetals Technologies Austria GmbH Energy-efficient production of a ferritic hot-rolled strip in an integrated casting-rolling plant
EP4015099B1 (fr) * 2020-12-15 2024-10-16 Primetals Technologies Austria GmbH Fabrication efficace en énergie d'un feuillard à chaud ferritique dans une installation composite de coulée et de laminage
CN115716086A (zh) * 2022-12-09 2023-02-28 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
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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CN114173957A (zh) 2022-03-11
EP4003623A1 (fr) 2022-06-01

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