EP1951451A1 - Method for producing a hot-rolled steel strip and combined casting and rolling installation for carrying out the method - Google Patents

Method for producing a hot-rolled steel strip and combined casting and rolling installation for carrying out the method

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Publication number
EP1951451A1
EP1951451A1 EP06818359A EP06818359A EP1951451A1 EP 1951451 A1 EP1951451 A1 EP 1951451A1 EP 06818359 A EP06818359 A EP 06818359A EP 06818359 A EP06818359 A EP 06818359A EP 1951451 A1 EP1951451 A1 EP 1951451A1
Authority
EP
European Patent Office
Prior art keywords
rolling
strip
rolled
group
hot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06818359A
Other languages
German (de)
French (fr)
Other versions
EP1951451B1 (en
EP1951451B2 (en
Inventor
Gerald Eckerstorfer
Gerald Hohenbichler
Josef Maierl
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
Voest Alpine Industrienlagenbau 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
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Application filed by Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Priority to SI200630700T priority Critical patent/SI1951451T1/en
Priority to PL06818359T priority patent/PL1951451T3/en
Publication of EP1951451A1 publication Critical patent/EP1951451A1/en
Publication of EP1951451B1 publication Critical patent/EP1951451B1/en
Application granted granted Critical
Publication of EP1951451B2 publication Critical patent/EP1951451B2/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0035—Forging or pressing devices as units
    • B21B15/005—Lubricating, cooling or heating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • 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
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills

Definitions

  • the invention relates to a method for producing a hot-rolled steel strip in coils or in sheets from a molten steel in a continuous production process with continuous passage through a combined casting and rolling plant and a combined casting and rolling plant for performing the method.
  • a process of this type comprises the following process steps: A steel strand is formed from liquid steel by continuous casting in a continuous casting mold of a continuous casting plant. In a subsequent first group of rolling mills, this cast steel strand is roll formed into a pre-rolled hot strip, and in a second set of rolling mills, this rough rolled hot strip is finish rolled into a hot rolled steel strip having the final desired dimensions and material properties. Between the first group of rolling stands and the second group of rolling stands, the pre-rolled hot strip was set to rolling temperature in a temperature adjuster to achieve favorable conditions for finish rolling. After finish rolling, the hot rolled steel strip passes through a cooling section and is wound into coils or cut into sheets.
  • the prior art discloses, in many variants, methods and arrangements of production equipment for producing a hot-rolled steel strip starting from the liquid phase, which can be assigned to a few basic types of process.
  • liquid steel is cast on a continuous casting machine into a continuous steel strand and cut into slabs with a casting thickness of more than 120 mm or into thin slabs with a casting thickness between 40 mm and 120 mm. Subsequently or with a production-related time interruption these precursors become rolled after tempera- ture equalization or basic reheating to rolling temperature in rolling mills to steel strip of specified target thickness. Usually this is a single- or multi-frame roughing and a multi-stand finishing train used.
  • WO 98/00248 already discloses a combined casting and rolling plant for the production of a deep-drawn quality steel strip in which a steel strand having a casting thickness of less than 100 mm is cast in the continuous casting mold of a continuous casting plant.
  • This cast steel strand is rolled after carrying out a descaling in a multi-stand Vor Identification at least to a winding tape thickness and after passing through an inductively heated furnace in which a non-oxidizing inert gas atmosphere maintained and in which the pre-rolled hot strip is heated to a temperature in the austenite Bound wound and stored in a cache.
  • the pre-rolled hot strip is fed to a finishing train and rolled in the ferritic microstructure to a final product.
  • the rolling speed in the finishing train can be product-specifically adjusted by decoupling from the caster.
  • the winding and unwinding of the pre-rolled steel strip into bundles and their intermediate storage result in considerably greater investment costs than in a continuous strip pass.
  • a decoupled production process in which at least the rolling speed in the finishing train can be set independently of the casting speed in the continuous casting plant is absolutely necessary.
  • this decoupling can be made equally and leads to the disadvantages described.
  • the object of the present invention is therefore to avoid the disadvantages of the known prior art and a method for producing a hot-rolled steel strip and a combined casting and rolling plant for carrying out this method with a continuous and preferably uninterrupted strip pass from the continuous casting mold to the passage through
  • a minimization of the additional energy input is achieved in the hot strip.
  • the object of the invention is to minimize the investment costs for the combined casting and rolling plant according to the invention and to reduce the operating costs for the production of the rolled steel strip, in particular the energy costs for the additional strip heating.
  • Another object of the present invention is to increase the flexibility of the proposed production process and the combined caster and mill in terms of the potential production of hot rolled steel strip in a wide range of steel grades.
  • the object underlying the invention is achieved by a method of the type described above in that the pre-rolled hot strip is descaled immediately before entering the Tempertureinstell insightful, the pre-rolled hot strip is kept in the temperature setting in a protective gas atmosphere and the pre-rolled hot strip after passing through the temperature adjustment is immediately roll formed in the second group of rolling mills.
  • the hot strip is kept in a protective gas atmosphere after descaling within the temperature adjustment, a further scaling process is largely avoided during heating of the hot strip to rolling temperature, but at least kept in a range that causes no loss of quality on the hot strip surface in the subsequent rolling process, so that an additional Descaling immediately before entry into the rolling stand is not necessary.
  • the sequence of the method steps according to the invention ensures that the hot-rolled strip temperature set in the temperature setting device is essentially maintained until entry into the first deformation stage of the second group of rolling stands, and heating of the hot strip to a temperature above the rolling temperature is no longer necessary.
  • the hot strip temperature can be kept lower by up to 80 0 C than in conventional methods with a belt descaling immediately before the roll stand.
  • the temperature adjuster During the heating of the rough-rolled hot strip to rolling temperature and the temperature compensation in the hot strip this is maintained in the temperature adjuster in an inert inert gas atmosphere having an oxygen content of less than 10.0 vol .-%.
  • the oxygen content is less than 2.0% by volume.
  • the protective gas atmosphere consists of nitrogen.
  • the pre-rolled hot strip may be maintained in the temperature adjuster during heating to rolling temperature in a reducing inert gas atmosphere.
  • the oxygen flowing into the protective gas chamber surrounding the temperature adjusting device is occasionally bound by the inlet or outlet openings and scaling at the surface of the strip is avoided.
  • the pre-rolled hot strip is set in the temperature adjuster to a predetermined roll entry temperature.
  • Optimal conditions for the rolling operation in the second group of rolling mills are given when the pre-rolled hot strip is set in the temperature adjuster depending on the current casting speed to a roll inlet temperature, which allows a final rolling temperature in the last stage of deformation of the second group of rolling mills, which in the austenitic Microstructure of the hot strip is.
  • the degree of reduction of the strip thickness in the first group of rolling stands is expediently taken into account.
  • the pre-rolled hot strip is expediently descaled with water jets at a jet pressure between 200 bar and 450 bar immediately before it enters the temperature setting device.
  • rotating, obliquely directed against the surface of the belt water jets are used from a Rotorentzu substantials issued.
  • the described method can be used particularly advantageously if a steel strand having a steel strand thickness between 50 and 150 mm is cast in the continuous casting mold, then the cast steel strand in a first group of rolling stands to a pre-rolled hot strip having a hot strip thickness between 6.0 and 30 mm The hot rolled strip is then thermoformed in a second group of rolling stands to a hot rolled steel strip having a final steel strip thickness between 0.6 and 5.0 mm.
  • the casting thickness at the outlet from the continuous casting mold essentially determines the number of downstream rolling stands.
  • the roll forming of the cast steel strand in the first group of rolling stands is effected by at least one rolling stand, preferably by three successive rolling stands.
  • the hot-forming of the pre-rolled hot strip in the second group of rolling stands is carried out by at least two, preferably by three to five successive rolling stands.
  • the pre-rolled hot strip is transversely divided between the first group of rolling stands and the descaling device.
  • the hot working of the cast steel strand in the first group of rolling stands is coupled to the casting process and the further hot working in the second group of rolling stands is decoupled from the casting process and thus can be carried out uninfluenced by this.
  • a combined casting and rolling plant for carrying out the process according to the invention comprises a continuous casting plant with a continuous casting mold for producing a cast steel strand, a first group of rolling stands for roll forming the cast steel strand into a pre-rolled hot strip, a second group of rolling stands for roll forming the rough rolled hot strip into one hot rolled steel strip, a temperature adjuster between the first group of rolling stands and the second group of rolling stands, and a belt coiler for winding the hot rolled steel strip into coils or a dicing device for cutting the hot rolled steel strip into sheets.
  • a Bogenstrangg intelligent fabric is used with an oscillating continuous casting mold.
  • the combined casting and rolling plant is characterized in that the temperature adjusting is arranged in a closed protective gas chamber, which is equipped with inlet and outlet openings for the pre-rolled hot strip and supply lines for a protective gas that descaling the protective gas chamber immediately is upstream and that the second group of rolling stands directly adjoins the protective gas chamber.
  • This arrangement ensures that no relevant scaling of the steel strip and on the transport of the steel strip from the exit from the protective gas chamber to the entrance to the first downstream rolling stand on the transport of the steel strip from entry into the protective gas chamber to the entrance to the first downstream mill relevant temperature loss occurs.
  • the temperature setting device is preferably designed as an induction heating device, since this allows for increased strip edge heating and possibly a zone-dependent different heating of the steel strip within its short cycle time. Furthermore, such an inductive heating device allows a very compact design of the temperature adjusting device, whereby the construction and operation of the protective gas chamber is cost-effective.
  • the descaling device is formed by at least one rotor descaling device.
  • Rotor descaling device is already known for example from EP 640 413 for the descaling of a rolling stock immediately before a roll stand.
  • a plurality of rotor descaling devices are arranged parallel to the inlet opening of the protective gas chamber immediately in front of this.
  • the outlet opening of the protective gas chamber comprises an outlet channel which is at most 5.0 m, preferably at most 3.0 m, in front of the nip of the first rolling stand of the second Group of rolling stands ends.
  • a transverse dividing shear preferably designed as a pendulum shear, for cross-dividing the pre-rolled hot strip is arranged between the first group of rolling stands and the descaling device.
  • the separated hot strip sections can be finished by the conventional tapping process.
  • 1 is a schematic representation of a combined casting and rolling plant for producing a hot-rolled steel strip
  • Fig. 2 shows the temperature profile on the steel strip after emerging from a
  • Fig. 3 shows the temperature profile on the steel strip after leaving a
  • Induction heater according to the inventive method with a descaling in front of the induction heater.
  • a combined casting and rolling plant for producing a hot-rolled steel strip from liquid steel in a continuous in-line production process comprises a Bogenstranggitis 1 conventional design, schematically in Figure 1 only by a continuous casting mold 2 and some of the following strand guide rollers 3 in the direction indicated by the arcuate steel strand course strand guide 4 is shown.
  • liquid steel is formed into a steel strand 5 of slab or thin slab cross section. Typical steel strand thicknesses are between 40 and 150 mm.
  • the casting speed for these systems is between 4.0 and 8.0 m / min and is very much dependent on steel products.
  • the cast steel strand 5 deflected in the strand guide 4 of the continuous casting plant in a horizontal belt transport direction R further passes through a first group of rolling stands 6 consisting of three rolling stands 6a, 6b, 6c which form a roughing group and in which the cast steel strip 5 is pre-rolled Hot strip 7 is formed with a hot strip thickness between 6 and 30 mm.
  • a first group of rolling stands 6 consisting of three rolling stands 6a, 6b, 6c which form a roughing group and in which the cast steel strip 5 is pre-rolled Hot strip 7 is formed with a hot strip thickness between 6 and 30 mm.
  • the cast Steel strip in each of the rolling stands with a reduction of up to 60% thickness reduced.
  • a straightening unit at the end of the continuous casting for straightening the cast steel strand in the horizontal tape transport direction an emergency cutting before or after the first group of rolling stands, the In addition to severing the Anfahrstrangkopfes is used, a dividing shear between the first group of rolling stands and the descaling or the protective gas chamber for occasionally shredding scrap boards and a descaling before the first roll stand group for removing the surface scale of the cast steel strand.
  • one or more deformation units 8 formed by drive rollers may be arranged in the strand guide for a reduction in the thickness of the steel strand while the core is still liquid core (liquid core soft-reduction).
  • the pre-rolled hot strip 7 is descaled on both sides in a descaling device 9.
  • This descaling device comprises a number of Rotorentzu substantialsUNEen 10, which are arranged in at least one row transverse to the strip direction R immediately before a protective gas chamber 11.
  • Rotorentzu substantials With the Rotorentzu substantials adopteden 10 rotating water jets are directed at a jet pressure of 200 to 450 bar obliquely against the surface of the pre-rolled hot strip and achieved a nearly complete descaling of the strip surface.
  • Other descaling devices may be used.
  • a protective gas chamber 11 which is equipped with an inlet opening 12 and an outlet opening 13 for the passage of the pre-rolled hot strip and the temperature adjusting means 14 for reheating and for temperature compensation of the hot strip.
  • These temperature adjusting devices are designed as induction heating devices 15, whereby a rapid introduction of heat into the hot strip moved past the heating devices is ensured as needed. A zone-related heating of the hot strip is thereby possible, in particular an increased heating in the band edge area.
  • the hot strip is brought in the protective gas chamber to a necessary for the subsequent finish rolling roller inlet temperature, at least depend on the number of subsequent rolling stands and the desired target material properties of the finish rolled steel strip.
  • the protective gas chamber 1 1 is equipped with supply lines 16, 17 and with corresponding control devices for the supply and removal of a largely inert or reducing protective gas to maintain a predetermined protective gas atmosphere.
  • the outlet opening 13 of the protective gas chamber 11 comprises an outlet channel 18, which encloses the pre-rolled hot strip, shields the room atmosphere and leads to the second group of rolling stands 19.
  • the free distance A between the outlet opening 13 of the outlet channel 18 to the nip 20 of the first stand 19a is not more than 5.0 m in order to avoid a relevant rescaling of the hot strip.
  • the four rolling stands 19a to 19d form a finishing train in which the pre-rolled hot strip 7 is finished to a hot rolled steel strip 21 having the intended target thickness of between 0.6 and 5.0 mm and finished with the predetermined material properties.
  • the steel strip 21 is transversely divided with a transverse dividing shear 22 and wound into coils in a band reeling device 23.
  • the steel strip can be cut with the dividing shears into sheets, which are then stacked in a stacking system to sheet packages.
  • the dividing shear 24 shown by dashed lines between the first group of rolling stands 6 and the descaling 9 allows decoupling of the combined casting and rolling process at this point, so that the pre-rolled hot strip 7, especially in larger hot strip thicknesses in the conventional tapping in the second subgroup of Rolling stands 19 can occur.
  • the invention is by no means limited to a second group of rolling stands of the type described. It is quite possible that intermediate stand heaters are arranged between individual rolling mills of the second roll stand group, with which the strip temperature is raised, if there are metallurgical or rolling technical requirements to do so. Furthermore, further individual rolling stands or groups of rolling stands can be arranged before or after the transverse dividing shear.
  • FIG. 2 shows the temperature profile of the pre-strip in a system configuration which corresponds to the prior art, in which the descaling device is arranged between the temperature setting device and the finishing scale.
  • FIG. 3 illustrates the temperature profile of the pre-strip in a system configuration according to the invention, in which the descaling device is arranged as close as possible before the protective gas chamber and the protective gas chamber.
  • Both temperature gradients are based on the production of a hot-rolled steel strip of the quality grade DD12 with an intended final roll thickness of 1.0 mm.
  • the maximum temperature when leaving the temperature setting device or the protective gas chamber is typically about 1250 ° C. for this steel quality. Unwanted local melting of the strip may occur at higher temperatures.
  • the descaling results in an average temperature loss of about 70 ° C. before the pre-strip enters the finishing scale.
  • the minimum casting speed, to achieve a final rolling temperature in the austenitic structure area of 850 0 C in the last rolling stand, in the illustrated case is 6.3 m / min at a steel strand thickness of 70 mm at the outlet of the continuous casting mold.
  • the pre-strip thickness after exit from the first group of three rolling stands is 14 mm.
  • the temperature loss at the descaling device is in this case ( Figure 2) about 95 ° C, the inlet temperature in the first rolling stand of the finishing scale is about 1110 0 C.
  • FIG. 3 shows the temperature profile in the case of a pre-strip in which the descaling has already taken place before entry into the protective gas chamber and which, after emerging from the protective gas chamber, is inserted directly into the finishing scale.
  • the Protective gas chamber 3.0 m away from the nip of the first rolling stand. All other boundary conditions (steel quality, final thickness, starting temperature, etc.) correspond to the boundary conditions of the comparative example.
  • the inlet temperature in the first rolling stand of the finishing scale is now at about 1 185 ° C.
  • a further increase of the inlet temperature by 20 to 30 0 C can be achieved by a corresponding thermal insulation of the protective gas chamber and the outlet channel to close to the first rolling stand of the finishing scale.

Abstract

A method for the production of a hot-rolled steel strip from a steel melt in a continuous manufacturing process: continuously casting a steel strand in a continuous casting mold of a continuous casting plant, roll-forming the case steel strand in a first group of roll stands into a pre-rolled hot strip, roll-forming the pre-rolled hot strip in a second group of roll stands into a hot-rolled steel strip, setting the hot strip to a rolling temperature between the first and second groups, and winding or dividing the hot-rolled steel strip; further: descaling the hot strip before temperature setting, holding the hot strip in a protective gas atmosphere during temperature setting. A combined casting and rolling plant for the method is disclosed.

Description

Verfahren zur Herstellung eines warmgewalzten Stahlbandes und kombinierte Gieß- und Walzanlage zur Durchführung des VerfahrensProcess for producing a hot-rolled steel strip and combined casting and rolling plant for carrying out the process
Die Erfindung betrifft ein Verfahren zur Herstellung eines warmgewalzten Stahlbandes in Bunden oder in Tafeln aus einer Stahlschmelze in einem kontinuierlichen Fertigungsprozess bei ununterbrochenem Durchlauf durch eine kombinierte Gieß- und Walzanlage sowie eine kombinierte Gieß- und Walzanlage zur Durchführung des Verfahrens.The invention relates to a method for producing a hot-rolled steel strip in coils or in sheets from a molten steel in a continuous production process with continuous passage through a combined casting and rolling plant and a combined casting and rolling plant for performing the method.
Ein Verfahren dieser Art umfasst folgende Verfahrensschritte: Aus Flüssigstahl wird durch kontinuierliches Gießen in einer Stranggießkokille einer Stranggießanlage ein Stahlstrang gebildet. In einer nachfolgenden ersten Gruppe von Walzgerüsten wird dieser gegossene Stahlstrang zu einem vorgewalzten Warmband walzverformt und in einer zweiten Gruppe von Walzgerüsten wird dieses vorgewalzte Warmband zu einem warmgewalzten Stahlband mit den angestrebten Endabmessungen und den angestrebten Materialeigenschaften fertiggewalzt. Zwischen der ersten Gruppe von Walzgerüsten und der zweiten Gruppe von Walzgerüsten erfolgte ein Einstellen des vorgewalzten Warmbandes auf Walztemperatur in einer Temperatureinstellvorrichtung, um günstige Bedingungen für das Fertigwalzen zu erreichen. Nach dem Fertigwalzen durchläuft das warmgewalzte Stahlband eine Kühlstrecke und wird zu Bunden gewickelt oder zu Tafeln zerteilt.A process of this type comprises the following process steps: A steel strand is formed from liquid steel by continuous casting in a continuous casting mold of a continuous casting plant. In a subsequent first group of rolling mills, this cast steel strand is roll formed into a pre-rolled hot strip, and in a second set of rolling mills, this rough rolled hot strip is finish rolled into a hot rolled steel strip having the final desired dimensions and material properties. Between the first group of rolling stands and the second group of rolling stands, the pre-rolled hot strip was set to rolling temperature in a temperature adjuster to achieve favorable conditions for finish rolling. After finish rolling, the hot rolled steel strip passes through a cooling section and is wound into coils or cut into sheets.
Aus dem Stand der Technik sind in vielen Varianten Verfahren und Anordnungen von Produktionseinrichtungen zur Herstellung eines warmgewalzten Stahlbandes ausgehend von der Flüssigphase bekannt, die einigen wenigen grundlegenden Verfahrensgattungen zugeordnet werden können.The prior art discloses, in many variants, methods and arrangements of production equipment for producing a hot-rolled steel strip starting from the liquid phase, which can be assigned to a few basic types of process.
Bei einem diskontinuierlichen Prozess zur Erzeugung eines warmgewalzten Stahlbandes wird auf einer Stranggießanlage Flüssigstahl zu einem kontinuierlichen Stahlstrang vergossen und dieser zu Brammen mit einer Gießdicke von mehr als 120 mm oder zu Dünnbrammen mit einer Gießdicke zwischen 40 mm und 120 mm zerteilt. Anschließend oder mit einer produktionsbedingten zeitlichen Unterbrechung werden diese Vorprodukte nach einem Temperaturausgleich oder einer grundlegenden Wiedererwärmung auf Walztemperatur in Walzanlagen zu Stahlband mit bestimmter Zieldicke gewalzt. Üblicherweise wird hierzu eine ein- oder mehrgerüstige Vorstraße und eine mehrgerüstige Fertigstraße eingesetzt.In a batch process for producing a hot-rolled steel strip, liquid steel is cast on a continuous casting machine into a continuous steel strand and cut into slabs with a casting thickness of more than 120 mm or into thin slabs with a casting thickness between 40 mm and 120 mm. Subsequently or with a production-related time interruption these precursors become rolled after tempera- ture equalization or basic reheating to rolling temperature in rolling mills to steel strip of specified target thickness. Usually this is a single- or multi-frame roughing and a multi-stand finishing train used.
Aus der WO 98/00248 ist bereits eine kombinierte Gieß- und Walzanlage zur Herstellung eines Stahlbandes in Tiefziehqualität bekannt, bei der in der Stranggießkokille einer Stranggießanlage ein Stahlstrang mit einer Gießdicke von weniger als 100 mm gegossen wird. Dieser gegossene Stahlstrang wird nach Durchführung einer Entzunderung in einer mehrgerüstigen Vorstraße zumindest bis auf eine wickelbare Banddicke gewalzt und nach Durchlaufen eines induktiv beheizten Ofens in dem eine nicht-oxidierende Schutzgasatmosphäre aufrecht erhalten und in dem das vorgewalzte Warmband auf eine Temperatur im Austenitbereich erhitzt wird, zu Bunden gewickelt und in einem Zwischenspeicher gespeichert. Nach dem Wiederabwickeln des Bundes wird das vorgewalzte Warmband einer Fertigstraße zugeführt und im ferritischen Gefügebereich zu einem Endprodukt gewalzt. Unabhängig von den spezifischen Anforderungen an die Anlagenanordnung, die sich aus der speziellen Stahlqualität bei diesem Stand der Technik ergeben, kann die Walzgeschwindigkeit in der Fertigstraße durch die Entkupplung von der Gießanlage produktspezifisch eingestellt werden. Allerdings ergeben sich durch das Aufwickeln und Abwickeln des vorgewalzten Stahlbandes zu Bunden und deren Zwischenspeicherung erheblich größere Investitionskosten, als bei einem kontinuierlichen Banddurchlauf. Bei einer mehrsträngigen Gießanlage ist ein solcherart entkoppeltes Herstellverfahren, bei dem zumindest die Walzgeschwindigkeit in der Fertigstraße unabhängig von der Gießgeschwindigkeit in der Stranggießanlage eingestellt werden kann zwingend notwendig. Bei einsträngigen Gießanlagen kann diese Entkopplung gleichermaßen vorgenommen werden und führt zu den beschriebenen Nachteilen.WO 98/00248 already discloses a combined casting and rolling plant for the production of a deep-drawn quality steel strip in which a steel strand having a casting thickness of less than 100 mm is cast in the continuous casting mold of a continuous casting plant. This cast steel strand is rolled after carrying out a descaling in a multi-stand Vorstraße at least to a winding tape thickness and after passing through an inductively heated furnace in which a non-oxidizing inert gas atmosphere maintained and in which the pre-rolled hot strip is heated to a temperature in the austenite Bound wound and stored in a cache. After rewinding the bundle, the pre-rolled hot strip is fed to a finishing train and rolled in the ferritic microstructure to a final product. Regardless of the specific requirements of the plant layout resulting from the specific steel quality of this prior art, the rolling speed in the finishing train can be product-specifically adjusted by decoupling from the caster. However, the winding and unwinding of the pre-rolled steel strip into bundles and their intermediate storage result in considerably greater investment costs than in a continuous strip pass. In a multi-strand casting plant, such a decoupled production process in which at least the rolling speed in the finishing train can be set independently of the casting speed in the continuous casting plant is absolutely necessary. In single-strand casting this decoupling can be made equally and leads to the disadvantages described.
Aus der WO 89/11363 ist ein kontinuierliches Verfahren der gattungsbildenden Art zur Herstellung eines warmgewalzten Stahlbandes bereits bekannt, bei dem die Gießgeschwindigkeit am Austritt aus der Stranggießkokille die Walzgeschwindigkeit in den nachgeordneten jeweiligen Verformungsstufen in Abhängigkeit vom Verformungsgrad in der jeweiligen Verformungsstufe bestimmt. Erst nach dem Austritt aus dem letzten Walzgerüst wird das kontinuierlich gegossene und warmgewalzte Stahlband entsprechend dem vorgegebenen Bundgewicht quergeteilt und zu Bunden gewickelt. Vor dem Eintritt des in einem Vorgerüst bereits vorgewalzten Warmbandes in die Fertigstraße wird dieses auf eine gleichmäßige Bandtemperatur gebracht, die über der Walztemperatur liegt und anschließend unmittelbar vor dem Eintritt in die Fertigstraße entzundert. Beim Entzundern mit Wasserstrahlen kommt es zu einem Temperaturverlust, der durch das vorhergehende Aufheizen auf eine Temperatur über der Walztemperatur ausgeglichen werden muss.From WO 89/11363 a continuous process of the generic type for producing a hot rolled steel strip is already known, in which the casting speed at the outlet from the continuous casting mold determines the rolling speed in the downstream respective deformation stages as a function of the degree of deformation in the respective deformation stage. Only after leaving the last mill stand, the continuously cast and hot rolled steel strip is divided according to the predetermined coil weight and wound into coils. Before entering the pre-rolled in a roughing mill hot strip in the finishing mill this is brought to a uniform belt temperature, which is above the rolling temperature and then descaled immediately before entering the finishing train. When descaling with water jets there is a loss of temperature, which must be compensated by the previous heating to a temperature above the rolling temperature.
Aufgabe der vorliegenden Erfindung ist es daher, die Nachteile des bekannten Standes der Technik zu vermeiden und ein Verfahren zur Herstellung eines warmgewalzten Stahlbandes und eine kombinierte Gieß- und Walzanlage zur Durchführung dieses Verfahrens mit einem kontinuierlichen und vorzugsweise ununterbrochenen Banddurchlauf von der Stranggießkokille bis zum Durchlauf durch die letzte Verformungsstufe der Fertigstraße vorzuschlagen, wobei durch eine Optimierung der Abfolge von Verfahrensschritten und der Abfolge der Anlagenkomponenten eine Minimierung des zusätzlichen Energieeintrages in das Warmband erreicht wird.The object of the present invention is therefore to avoid the disadvantages of the known prior art and a method for producing a hot-rolled steel strip and a combined casting and rolling plant for carrying out this method with a continuous and preferably uninterrupted strip pass from the continuous casting mold to the passage through To propose the last deformation stage of the finishing train, wherein by optimizing the sequence of process steps and the sequence of plant components, a minimization of the additional energy input is achieved in the hot strip.
Weiters liegt der Erfindung die Aufgabe zugrunde die Investitionskosten für die erfindungsgemäße kombinierte Gieß- und Walzanlage zu minimieren und die Betriebkosten für die Herstellung des gewalzten Stahlbandes, insbesondere die Energiekosten für die zusätzliche Banderwärmung zu senken.Furthermore, the object of the invention is to minimize the investment costs for the combined casting and rolling plant according to the invention and to reduce the operating costs for the production of the rolled steel strip, in particular the energy costs for the additional strip heating.
Weiters liegt der Erfindung die Aufgabe zugrunde die Flexibilität des vorgeschlagenen Erzeugungsverfahrens und der kombinierten Gieß- und Walzanlage hinsichtlich der möglichen Erzeugung von warmgewalztem Stahlband in einem weiten Spektrum von Stahlqualitäten zu vergrößern.Another object of the present invention is to increase the flexibility of the proposed production process and the combined caster and mill in terms of the potential production of hot rolled steel strip in a wide range of steel grades.
Die der Erfindung zugrunde liegende Aufgabe wird mit einem Verfahren der eingangs beschriebenen Art dadurch gelöst, dass das vorgewalzte Warmband unmittelbar vor dem Eintritt in die Tempertureinstelleinrichtung entzundert wird, das vorgewalzte Warmband in der Temperatureinstelleinrichtung in einer Schutzgasatmosphäre gehalten wird und das vorgewalzte Warmband nach Durchlaufen der Temperatureinstelleinrichtung unmittelbar nachfolgend in der zweiten Gruppe von Walzgerüsten walzverformt wird.The object underlying the invention is achieved by a method of the type described above in that the pre-rolled hot strip is descaled immediately before entering the Tempertureinstelleinrichtung, the pre-rolled hot strip is kept in the temperature setting in a protective gas atmosphere and the pre-rolled hot strip after passing through the temperature adjustment is immediately roll formed in the second group of rolling mills.
Da das Warmband nach dem Entzundern innerhalb der Temperatureinstelleinrichtung in einer Schutzgasatmosphäre gehalten wird, wird ein weiterer Verzunderungsvorgang während des Aufheizens des Warmbandes auf Walztemperatur weitestgehend vermieden, zumindest jedoch in einem Bereich gehalten, der im nachfolgenden Walzvorgang keine Qualitätseinbußen an der Warmbandoberfläche hervorruft, sodass ein zusätzliches Entzundern unmittelbar vor dem Eintritt in das Walzgerüst entfällt. Durch die erfindungsgemäße Abfolge der Verfahrensschritte wird erreicht, dass die in der Temperatureinstelleinrichtung eingestellte Warmbandtemperatur bis zum Eintritt in die erste Verformungsstufe der zweiten Gruppe von Walzgerüsten im Wesentlichen erhalten bleibt und damit ein Aufheizen des Warmbandes auf eine Temperatur über der Walztemperatur nicht mehr notwendig ist. Damit kann die Warmbandtemperatur um bis zu 800C niedriger gehalten werden als bei herkömmlichen Verfahren mit einer Bandentzunderung unmittelbar vor dem Walzgerüst.Since the hot strip is kept in a protective gas atmosphere after descaling within the temperature adjustment, a further scaling process is largely avoided during heating of the hot strip to rolling temperature, but at least kept in a range that causes no loss of quality on the hot strip surface in the subsequent rolling process, so that an additional Descaling immediately before entry into the rolling stand is not necessary. By the The sequence of the method steps according to the invention ensures that the hot-rolled strip temperature set in the temperature setting device is essentially maintained until entry into the first deformation stage of the second group of rolling stands, and heating of the hot strip to a temperature above the rolling temperature is no longer necessary. Thus, the hot strip temperature can be kept lower by up to 80 0 C than in conventional methods with a belt descaling immediately before the roll stand.
Während des Aufheizens des vorgewalzten Warmbandes auf Walztemperatur und des Temperaturausgleiches im Warmband wird dieses in der Temperatureinstelleinrichtung in einer inerten Schutzgasatmosphäre mit einem Sauerstoffgehalt von weniger als 10,0 Vol.-% gehalten. Vorzugsweise liegt der Sauerstoffgehalt unter 2,0 Vol.-%. Überwiegend besteht die Schutzgasatmosphäre aus Stickstoff.During the heating of the rough-rolled hot strip to rolling temperature and the temperature compensation in the hot strip this is maintained in the temperature adjuster in an inert inert gas atmosphere having an oxygen content of less than 10.0 vol .-%. Preferably, the oxygen content is less than 2.0% by volume. Predominantly the protective gas atmosphere consists of nitrogen.
Nach einer weiteren Ausführungsform kann das vorgewalzte Warmband in der Temperatureinstelleinrichtung während des Aufheizens auf Walztemperatur in einer reduzierenden Schutzgasatmosphäre gehalten werden. Dadurch wird der fallweise durch Eintritts- oder Austrittsöffnungen der die Temperatureinstelleinrichtung umgebenden Schutzgaskammer einfließender Sauerstoff gebunden und Verzunderungen an der Bandoberfläche vermieden.According to a further embodiment, the pre-rolled hot strip may be maintained in the temperature adjuster during heating to rolling temperature in a reducing inert gas atmosphere. As a result, the oxygen flowing into the protective gas chamber surrounding the temperature adjusting device is occasionally bound by the inlet or outlet openings and scaling at the surface of the strip is avoided.
Vorzugsweise wird das vorgewalzte Warmband in der Temperatureinstelleinrichtung auf eine vorbestimmte Walzeintrittstemperatur eingestellt. Optimale Bedingungen für den Walzvorgang in der zweiten Gruppe von Walzgerüsten sind gegeben, wenn das vorgewalzte Warmband in der Temperatureinstelleinrichtung in Abhängigkeit von der aktuellen Gießgeschwindigkeit auf eine Walzeintrittstemperatur eingestellt wird, die einer Endwalztemperatur in der letzten Verformungsstufe der zweiten Gruppe von Walzgerüsten zulässt, die im austenitischen Gefügebereich des Warmbandes liegt. Zweckmäßig wird zusätzlich zur aktuellen Gießgeschwindigkeit auch der Reduktionsgrad der Banddicke in der ersten Gruppe von Walzgerüsten berücksichtigt.Preferably, the pre-rolled hot strip is set in the temperature adjuster to a predetermined roll entry temperature. Optimal conditions for the rolling operation in the second group of rolling mills are given when the pre-rolled hot strip is set in the temperature adjuster depending on the current casting speed to a roll inlet temperature, which allows a final rolling temperature in the last stage of deformation of the second group of rolling mills, which in the austenitic Microstructure of the hot strip is. In addition to the actual casting speed, the degree of reduction of the strip thickness in the first group of rolling stands is expediently taken into account.
Zweckmäßig wird das vorgewalzte Warmband unmittelbar vor dem Eintritt in die Temperatureinstellvorrichtung mit Wasserstrahlen bei einem Strahldruck zwischen 200 bar und 450 bar entzundert. Bevorzugt werden rotierende, schräg gegen die Bandoberfläche gerichtete Wasserstrahlen aus einer Rotorentzunderungseinrichtung verwendet. Besonders vorteilhaft kann das beschriebene Verfahren eingesetzt werden, wenn in der Stranggießkokille ein Stahlstrang mit einer Stahlstrangdicke zwischen 50 und 150 mm gegossen wird, der gegossene Stahlstrang anschließend in einer ersten Gruppe von Walzgerüsten zu einem vorgewalzten Warmband mit einer Warmbanddicke zwischen 6,0 und 30 mm walzverformt wird und das vorgewalzte Warmband im Weiteren in einer zweiten Gruppe von Walzgerüsten zu einem warmgewalzten Stahlband mit einer Stahlband- Enddicke zwischen 0,6 und 5,0 mm warmverformt wird.The pre-rolled hot strip is expediently descaled with water jets at a jet pressure between 200 bar and 450 bar immediately before it enters the temperature setting device. Preferably, rotating, obliquely directed against the surface of the belt water jets are used from a Rotorentzunderungseinrichtung. The described method can be used particularly advantageously if a steel strand having a steel strand thickness between 50 and 150 mm is cast in the continuous casting mold, then the cast steel strand in a first group of rolling stands to a pre-rolled hot strip having a hot strip thickness between 6.0 and 30 mm The hot rolled strip is then thermoformed in a second group of rolling stands to a hot rolled steel strip having a final steel strip thickness between 0.6 and 5.0 mm.
Die Gießdicke am Austritt aus der Stranggießkokille bestimmt wesentlich die Anzahl der nachgeordneten Walzgerüste. In Abhängigkeit der Gießdicke erfolgt das Walzverformen des gegossenen Stahlstranges in der ersten Gruppe von Walzgerüsten durch mindestens ein Walzgerüst, vorzugsweise durch drei aufeinander folgende Walzgerüste. Im Weiteren erfolgt das Warmverformen des vorgewalzten Warmbandes in der zweiten Gruppe von Walzgerüsten durch mindestens zwei, vorzugsweise durch drei bis fünf aufeinander folgende Walzgerüste.The casting thickness at the outlet from the continuous casting mold essentially determines the number of downstream rolling stands. Depending on the casting thickness, the roll forming of the cast steel strand in the first group of rolling stands is effected by at least one rolling stand, preferably by three successive rolling stands. Furthermore, the hot-forming of the pre-rolled hot strip in the second group of rolling stands is carried out by at least two, preferably by three to five successive rolling stands.
Nach einer möglichen Ausführungsform der Erfindung wird das vorgewalzte Warmband zwischen der ersten Gruppe von Walzgerüsten und der Entzunderungseinrichtung quergeteilt. Damit ist das Warmverformen des gegossenen Stahlstranges in der ersten Gruppe von Walzgerüsten an den Gießprozess gekoppelt und das weitere Warmverformen in der zweiten Gruppe von Walzgerüsten vom Gießprozess entkoppelt und kann somit unbeeinflusst von diesem durchgeführt werden. Damit wird, vorzugsweise für dickere Bänder, die Möglichkeit eröffnet, diese im konventionellen Anstichverfahren fertigzuwalzen.According to a possible embodiment of the invention, the pre-rolled hot strip is transversely divided between the first group of rolling stands and the descaling device. Thus, the hot working of the cast steel strand in the first group of rolling stands is coupled to the casting process and the further hot working in the second group of rolling stands is decoupled from the casting process and thus can be carried out uninfluenced by this. This opens up the possibility, preferably for thicker strips, of finish-rolling them in the conventional tapping process.
Eine kombinierte Gieß- und Walzanlage zur Durchführung des erfindungsgemäßen Verfahrens umfasst eine Stranggießanlage mit einer Stranggießkokille zur Herstellung eines gegossenen Stahlstranges, eine erste Gruppe von Walzgerüsten zum Walzverformen des gegossenen Stahlstranges zu einem vorgewalzten Warmband, eine zweite Gruppe von Walzgerüsten zum Walzverformen des vorgewalzten Warmbandes zu einem warmgewalzten Stahlband, eine Temperatureinstelleinrichtung zwischen der ersten Gruppe von Walzgerüsten und der zweiten Gruppe von Walzgerüsten und eine Bandhaspeleinrichtung zum Aufwickeln des warmgewalzten Stahlbandes zu Bunden oder eine Zerteileinrichtung zum Zerteilen des warmgewalzten Stahlbandes zu Tafeln. Vorzugsweise wird eine Bogenstranggießanlage mit einer oszillierenden Stranggießkokille eingesetzt. Zur Lösung der gestellten Aufgabe ist die kombinierte Gieß- und Walzanlage dadurch gekennzeichnet, dass die Temperatureinstelleinrichtung in einer geschlossenen Schutzgaskammer angeordnet ist, die mit Eintritts- und Austrittsöffnungen für das vorgewalzte Warmband und mit Versorgungsleitungen für ein Schutzgas ausgestattet ist, dass eine Entzunderungseinrichtung der Schutzgaskammer unmittelbar vorgelagert ist und dass die zweite Gruppe von Walzgerüsten unmittelbar an die Schutzgaskammer anschließt. Durch diese Anordnung ist sichergestellt, dass auf dem Transportweg des Stahlbandes vom Eintritt in die Schutzgaskammer bis zum Eintritt in das erste nachgeordnete Walzgerüst keine relevante Verzunderung des Stahlbandes und auf dem Transportweg des Stahlbandes vom Austritt aus der Schutzgaskammer bis zum Eintritt in das erste nachgeordnete Walzgerüst kein relevanter Temperaturverlust auftritt.A combined casting and rolling plant for carrying out the process according to the invention comprises a continuous casting plant with a continuous casting mold for producing a cast steel strand, a first group of rolling stands for roll forming the cast steel strand into a pre-rolled hot strip, a second group of rolling stands for roll forming the rough rolled hot strip into one hot rolled steel strip, a temperature adjuster between the first group of rolling stands and the second group of rolling stands, and a belt coiler for winding the hot rolled steel strip into coils or a dicing device for cutting the hot rolled steel strip into sheets. Preferably, a Bogenstranggießanlage is used with an oscillating continuous casting mold. To achieve the object, the combined casting and rolling plant is characterized in that the temperature adjusting is arranged in a closed protective gas chamber, which is equipped with inlet and outlet openings for the pre-rolled hot strip and supply lines for a protective gas that descaling the protective gas chamber immediately is upstream and that the second group of rolling stands directly adjoins the protective gas chamber. This arrangement ensures that no relevant scaling of the steel strip and on the transport of the steel strip from the exit from the protective gas chamber to the entrance to the first downstream rolling stand on the transport of the steel strip from entry into the protective gas chamber to the entrance to the first downstream mill relevant temperature loss occurs.
Vorzugsweise ist die Temperatureinstelleinrichtung als Induktionsheizeinrichtung ausgebildet, da diese eine verstärkte Bandkantenaufheizung und gegebenenfalls eine zonenabhängig unterschiedliche Aufheizung des Stahlbandes innerhalb seiner kurzen Durchlaufzeit ermöglicht. Weiters ermöglicht eine derartige induktive Heizeinrichtung eine sehr kompakte Bauweise der Temperatureinstelleinrichtung, wodurch auch die Errichtung und der Betrieb der Schutzgaskammer kostengünstig möglich ist.The temperature setting device is preferably designed as an induction heating device, since this allows for increased strip edge heating and possibly a zone-dependent different heating of the steel strip within its short cycle time. Furthermore, such an inductive heating device allows a very compact design of the temperature adjusting device, whereby the construction and operation of the protective gas chamber is cost-effective.
Nach einer bevorzugten Ausführungsform ist die Entzunderungseinrichtung von mindestens einer Rotorentzunderungseinrichtung gebildet. Eine derartigeAccording to a preferred embodiment, the descaling device is formed by at least one rotor descaling device. Such
Rotorentzunderungseinrichtung ist beispielsweise aus der EP 640 413 für die Entzunderung eines Walzgutes unmittelbar vor einem Walzgerüst bereits bekannt. Zweckmäßig sind mehrere Rotorentzunderungseinrichtungen parallel zur Eintrittsöffnung der Schutzgaskammer unmittelbar vor dieser angeordnet.Rotor descaling device is already known for example from EP 640 413 for the descaling of a rolling stock immediately before a roll stand. Suitably, a plurality of rotor descaling devices are arranged parallel to the inlet opening of the protective gas chamber immediately in front of this.
Zur weitgehenden Vermeidung einer neuerlichen Verzunderung des Stahlbandes vor dem Eintritt in das erste Walzgerüst der zweiten Gruppe von Walzgerüsten umfasst die Austrittsöffnung der Schutzgaskammer einen Austrittskanal, der maximal 5,0 m, vorzugsweise maximal 3,0 m, vor dem Walzspalt des ersten Walzgerüstes der zweiten Gruppe von Walzgerüsten endet. Auf dieser kurzen Wegstrecke kommt es bei den dort auftretenden Bandgeschwindigkeiten erfahrungsgemäß zwar zu einem neuerlichen Aufbau einer Zunderschicht mit einer Zunderschichtdicke von maximal 8 μm, die allerdings keine Probleme für die Oberflächenqualität des Walzgutes verursacht. Nach einer möglichen Variante der kombinierten Gieß- und Walzanlage ist eine vorzugsweise als Pendelschere ausgebildete Querteilschere zum Querteilen des vorgewalzten Warmbandes zwischen der ersten Gruppe von Walzgerüsten und der Entzunderungseinrichtung angeordnet. Die abgetrennten Warmbandabschnitte können nach dem konventionellen Anstichverfahren fertiggewalzt werden.To largely avoid renewed scaling of the steel strip prior to entry into the first rolling stand of the second group of rolling stands, the outlet opening of the protective gas chamber comprises an outlet channel which is at most 5.0 m, preferably at most 3.0 m, in front of the nip of the first rolling stand of the second Group of rolling stands ends. Experience has shown that on this short path, although there is a renewed build-up of a scale layer with a scale layer thickness of not more than 8 .mu.m, the strip speeds occurring there do not cause any problems for the surface quality of the rolling stock. According to a possible variant of the combined casting and rolling plant, a transverse dividing shear, preferably designed as a pendulum shear, for cross-dividing the pre-rolled hot strip is arranged between the first group of rolling stands and the descaling device. The separated hot strip sections can be finished by the conventional tapping process.
Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung eines nicht einschränkenden Ausführungsbeispieles, wobei auf beiliegende Figuren Bezug genommen wird, die folgendes zeigen:Further advantages and features of the present invention will become apparent from the following description of a non-limiting embodiment, reference being made to accompanying figures which show:
Fig. 1 eine schematische Darstellung einer kombinierten Gieß- und Walzanlage zur Herstellung eines warmgewalzten Stahlbandes,1 is a schematic representation of a combined casting and rolling plant for producing a hot-rolled steel strip,
Fig. 2 den Temperaturverlauf am Stahlband nach dem Austritt aus einerFig. 2 shows the temperature profile on the steel strip after emerging from a
Induktionsheizeinrichtung gemäß dem Stand der Technik mit einer Entzunderung vor der zweiten Gruppe von Walzgerüsten,Induction heating device according to the prior art with a descaling before the second group of rolling stands,
Fig. 3 den Temperaturverlauf am Stahlband nach dem Austritt aus einerFig. 3 shows the temperature profile on the steel strip after leaving a
Induktionsheizeinrichtung gemäß dem erfindungsgemäßen Verfahren mit einer Entzunderung vor der Induktionsheizeinrichtung.Induction heater according to the inventive method with a descaling in front of the induction heater.
Eine kombinierte Gieß- und Walzanlage zur Herstellung eines warmgewalzten Stahlbandes aus Flüssigstahl in einem kontinuierlichen Inline-Herstellungsprozess umfasst eine Bogenstranggießanlage 1 üblicher Bauart, die in Figur 1 schematisch lediglich durch eine Stranggießkokille 2 und einige der nachfolgenden Strangführungsrollen 3 in der durch den bogenförmigen Stahlstrangverlauf angedeuteten Strangführung 4 dargestellt ist. In der gekühlten Stranggießkokille 1 wird flüssiger Stahl zu einem Stahlstrang 5 mit Brammenoder Dünnbrammenquerschnitt geformt. Übliche Stahlstrangdicken liegen zwischen 40 und 150 mm. Die Gießgeschwindigkeit liegt bei diesen Anlagen zwischen 4,0 und 8,0 m/min und ist sehr wesentlich stahlgüteabhängig.A combined casting and rolling plant for producing a hot-rolled steel strip from liquid steel in a continuous in-line production process comprises a Bogenstranggießanlage 1 conventional design, schematically in Figure 1 only by a continuous casting mold 2 and some of the following strand guide rollers 3 in the direction indicated by the arcuate steel strand course strand guide 4 is shown. In the cooled continuous casting mold 1, liquid steel is formed into a steel strand 5 of slab or thin slab cross section. Typical steel strand thicknesses are between 40 and 150 mm. The casting speed for these systems is between 4.0 and 8.0 m / min and is very much dependent on steel products.
Der in der Strangführung 4 der Stranggießanlage in eine horizontale Bandtransportrichtung R umgelenkte gegossene Stahlstrang 5 durchläuft im Weiteren eine erste Gruppe von Walzgerüsten 6, bestehend aus drei Walzgerüsten 6a, 6b, 6c, die eine Vorgerüstgruppe bilden und in der das gegossene Stahlband 5 zu einem vorgewalzten Warmband 7 mit einer Warmbanddicke zwischen 6 und 30 mm umgeformt wird. Hierbei wird das gegossene Stahlband in jedem der Walzgerüste mit einem Reduktionsgrad von bis zu 60 % dickenreduziert.The cast steel strand 5 deflected in the strand guide 4 of the continuous casting plant in a horizontal belt transport direction R further passes through a first group of rolling stands 6 consisting of three rolling stands 6a, 6b, 6c which form a roughing group and in which the cast steel strip 5 is pre-rolled Hot strip 7 is formed with a hot strip thickness between 6 and 30 mm. Here is the cast Steel strip in each of the rolling stands with a reduction of up to 60% thickness reduced.
In diesem Anlagenbereich sind üblicherweise weitere Anlagenkomponenten positioniert, die hier nicht im einzelnen dargestellt sind, wie beispielsweise eine Richteinheit am Ende der Stranggießanlage für das Geraderichten des gegossenen Stahlstranges in die horizontale Bandtransportrichtung, eine Notschneideeinrichtung vor oder im Anschluss an die erste Gruppe von Walzgerüsten, die zusätzlich zum Abtrennen des Anfahrstrangkopfes eingesetzt wird, eine Querteilschere zwischen der ersten Gruppe von Walzgerüsten und der Entzunderungseinrichtung bzw. der Schutzgaskammer zum fallweisen Häckseln von Schrotttafeln und eine Entzunderungseinrichtung vor der ersten Walzgerüstgruppe zum Entfernen des Oberflächenzunders vom gegossenen Stahlstrang. Zusätzlich können eine oder mehrere von Treiberrollen gebildete Verformungseinheiten 8 für eine Dickenreduktion des Stahlstranges bei noch flüssigem Kern (liquid core soft-reduction) in der Strangführung angeordnet sein.In this plant area usually other plant components are positioned, which are not shown here in detail, such as a straightening unit at the end of the continuous casting for straightening the cast steel strand in the horizontal tape transport direction, an emergency cutting before or after the first group of rolling stands, the In addition to severing the Anfahrstrangkopfes is used, a dividing shear between the first group of rolling stands and the descaling or the protective gas chamber for occasionally shredding scrap boards and a descaling before the first roll stand group for removing the surface scale of the cast steel strand. In addition, one or more deformation units 8 formed by drive rollers may be arranged in the strand guide for a reduction in the thickness of the steel strand while the core is still liquid core (liquid core soft-reduction).
Nach der ersten Walzverformung in der ersten Gruppe von Walzgerüsten 6 wird das vorgewalzte Warmband 7 in einer Entzunderungseinrichtung 9 beidseitig entzundert. Diese Entzunderungseinrichtung umfasst eine Anzahl von Rotorentzunderungseinrichtungen 10, die in zumindest einer Reihe quer zur Bandlaufrichtung R unmittelbar vor einer Schutzgaskammer 11 angeordnet sind. Mit den Rotorentzunderungseinrichtungen 10 werden rotierende Wasserstrahlen mit einem Strahldruck von 200 bis 450 bar schräg gegen die Oberfläche des vorgewalzten Warmbandes gerichtet und eine nahezu vollständige Entzunderung der Bandoberfläche erreicht. Auch andere Entzunderungseinrichtungen können verwendet werden.After the first rolling deformation in the first group of rolling stands 6, the pre-rolled hot strip 7 is descaled on both sides in a descaling device 9. This descaling device comprises a number of Rotorentzunderungseinrichtungen 10, which are arranged in at least one row transverse to the strip direction R immediately before a protective gas chamber 11. With the Rotorentzunderungseinrichtungen 10 rotating water jets are directed at a jet pressure of 200 to 450 bar obliquely against the surface of the pre-rolled hot strip and achieved a nearly complete descaling of the strip surface. Other descaling devices may be used.
Unmittelbar an die Entzunderungseinrichtung 9 schließt eine Schutzgaskammer 11 an, die mit einer Eintrittsöffnung 12 und einer Austrittsöffnung 13 für die Durchleitung des vorgewalzten Warmbandes ausgestattet ist und die Temperatureinstelleinrichtungen 14 zur Wiedererwärmung und zum Temperaturausgleich des Warmbandes aufweist. Diese Temperatureinstelleinrichtungen sind als Induktionsheizeinrichtungen 15 ausgebildet, wodurch bedarfgerecht eine schnelle Wärmeeinleitung in das an den Heizeinrichtungen vorbeibewegte Warmband sichergestellt ist. Auch eine zonenbezogene Aufheizung des Warmbandes ist dadurch möglich, insbesondere ein verstärktes Aufheizen im Bandkantenbereich. Das Warmband wird in der Schutzgaskammer auf eine für das nachfolgende Fertigwalzen notwendige Walzeingangstemperatur gebracht, die zumindest von der Anzahl der nachfolgenden Walzgerüste und den angestrebten Zielmaterialeigenschaften des fertiggewalzten Stahlbandes abhängen.Immediately to the descaling 9 includes a protective gas chamber 11, which is equipped with an inlet opening 12 and an outlet opening 13 for the passage of the pre-rolled hot strip and the temperature adjusting means 14 for reheating and for temperature compensation of the hot strip. These temperature adjusting devices are designed as induction heating devices 15, whereby a rapid introduction of heat into the hot strip moved past the heating devices is ensured as needed. A zone-related heating of the hot strip is thereby possible, in particular an increased heating in the band edge area. The hot strip is brought in the protective gas chamber to a necessary for the subsequent finish rolling roller inlet temperature, at least depend on the number of subsequent rolling stands and the desired target material properties of the finish rolled steel strip.
Die Schutzgaskammer 1 1 ist mit Versorgungsleitungen 16, 17 und mit entsprechenden Regeleinrichtungen für das Zu- und Abführen eines weitgehend inerten oder reduzierenden Schutzgases zur Einhaltung einer vorbestimmten Schutzgasatmosphäre ausgestattet.The protective gas chamber 1 1 is equipped with supply lines 16, 17 and with corresponding control devices for the supply and removal of a largely inert or reducing protective gas to maintain a predetermined protective gas atmosphere.
Die Austrittsöffnung 13 der Schutzgaskammer 11 umfasst einen Austrittskanal 18, der das vorgewalzte Warmband umschließt, zur Raumatmosphäre abschirmt und zur zweiten Gruppe von Walzgerüsten 19 überleitet. Der freie Abstand A zwischen der Austrittsöffnung 13 des Austrittskanals 18 zum Walzspalt 20 des ersten Walzgerüstes 19a beträgt nicht mehr als 5,0 m, um ein relevantes Wiederverzundern des Warmbandes zu vermeiden. Die vier Walzgerüste 19a bis19d bilden eine Fertigstraße, in der das vorgewalzte Warmband 7 zu einem warmgewalzten Stahlband 21 mit der angestrebten Zieldicke, die zwischen 0,6 und 5,0 mm liegt und mit den vorgegebenen Materialeigenschaften fertiggewalzt.The outlet opening 13 of the protective gas chamber 11 comprises an outlet channel 18, which encloses the pre-rolled hot strip, shields the room atmosphere and leads to the second group of rolling stands 19. The free distance A between the outlet opening 13 of the outlet channel 18 to the nip 20 of the first stand 19a is not more than 5.0 m in order to avoid a relevant rescaling of the hot strip. The four rolling stands 19a to 19d form a finishing train in which the pre-rolled hot strip 7 is finished to a hot rolled steel strip 21 having the intended target thickness of between 0.6 and 5.0 mm and finished with the predetermined material properties.
Abschließend wird das Stahlband 21 mit einer Querteilschere 22 quergeteilt und in einer Bandhaspeleinrichtung 23 zu Bunden gewickelt. Gleichermaßen kann das Stahlband mit der Querteilschere zu Tafeln zerteilt werden, die anschließend in einer Stapelanlage zu Tafelpaketen gestapelt werden.Finally, the steel strip 21 is transversely divided with a transverse dividing shear 22 and wound into coils in a band reeling device 23. Similarly, the steel strip can be cut with the dividing shears into sheets, which are then stacked in a stacking system to sheet packages.
Die mit strichlierten Linien dargestellte Querteilschere 24 zwischen der ersten Gruppe von Walzgerüsten 6 und der Entzunderungseinrichtung 9 ermöglicht eine Entkopplung des kombinierten Gieß- und Walzprozesses an dieser Stelle, sodass das vorgewalzte Warmband 7, speziell bei größeren Warmbanddicken im konventionellen Anstichverfahren in die nachgeordnete zweite Gruppe von Walzgerüsten 19 eintreten kann.The dividing shear 24 shown by dashed lines between the first group of rolling stands 6 and the descaling 9 allows decoupling of the combined casting and rolling process at this point, so that the pre-rolled hot strip 7, especially in larger hot strip thicknesses in the conventional tapping in the second subgroup of Rolling stands 19 can occur.
Die Erfindung ist keineswegs auf eine zweite Gruppe von Walzgerüsten der beschriebenen Art beschränkt. Es ist durchaus möglich, dass zwischen einzelnen Walzgerüsten der zweiten Walzgerüstgruppe Zwischengerüstheizungen angeordnet sind, mit denen die Bandtemperatur angehoben wird, wenn metallurgische oder walztechnische Erfordernisse dazu bestehen. Weiters können weitere einzelne Walzgerüste oder Gruppen von Walzgerüsten vor oder nach der Querteilschere angeordnet sein.The invention is by no means limited to a second group of rolling stands of the type described. It is quite possible that intermediate stand heaters are arranged between individual rolling mills of the second roll stand group, with which the strip temperature is raised, if there are metallurgical or rolling technical requirements to do so. Furthermore, further individual rolling stands or groups of rolling stands can be arranged before or after the transverse dividing shear.
In den Figuren 2 und 3 wird der Temperaturverlauf am vorgewalzten Warmband (Vorstreifen) vom Austritt aus der Temperatureinstelleinrichtung bzw. der Schutzgaskammer bis zum Erreichen der Endwalzdicke im Walzspalt des letzten Walzgerüstes einer von fünf Walzgerüsten gebildeten zweiten Gruppen von Walzgerüsten (Fertigstaffel) für zwei Verfahrensweisen gegenüber gestellt. In Figur 2 ist der Temperaturverlauf des Vorstreifens bei einer Anlagenkonfiguration dargestellt, die dem Stand der Technik entspricht, bei der die Entzunderungseinrichtung zwischen der Temperatureinstelleinrichtung und der Fertigstaffel angeordnet ist. In Figur 3 ist demgegenüber der Temperaturverlauf des Vorstreifens bei einer Anlagenkonfiguration gemäß der Erfindung dargestellt, bei der die Entzunderungseinrichtung vor der Schutzgaskammer und die Schutzgaskammer möglichst knapp vor der Fertigstaffel angeordnet ist.In Figures 2 and 3, the temperature profile on the pre-rolled hot strip (pre-strip) from the exit from the temperature setting or the Protective gas chamber set up to reach the final roll thickness in the nip of the last rolling mill of a set of five rolling stands second groups of rolling stands (finishing scale) for two procedures compared. FIG. 2 shows the temperature profile of the pre-strip in a system configuration which corresponds to the prior art, in which the descaling device is arranged between the temperature setting device and the finishing scale. In contrast, FIG. 3 illustrates the temperature profile of the pre-strip in a system configuration according to the invention, in which the descaling device is arranged as close as possible before the protective gas chamber and the protective gas chamber.
Beiden Temperaturverläufen liegt die Herstellung eines warmgewalzten Stahlbandes der Stahlgüte DD12 mit einer angestrebten Endwalzdicke von 1 ,0 mm zugrunde. Die maximale Temperatur beim Verlassen der Temperatureinstelleinrichtung bzw. der Schutzgaskammer beträgt für diese Stahlqualität typischerweise ca. 12500C. Bei höheren Temperaturen kann unerwünschtes lokales Aufschmelzen des Bandes auftreten. Bei der Anordnung einer Entzunderungseinrichtung vor der Fertigstaffel kommt es beim Entzundern zu einem durchschnittlichen Temperaturverlust von etwa 70°C bevor der Vorstreifen in die Fertigstaffel einläuft.Both temperature gradients are based on the production of a hot-rolled steel strip of the quality grade DD12 with an intended final roll thickness of 1.0 mm. The maximum temperature when leaving the temperature setting device or the protective gas chamber is typically about 1250 ° C. for this steel quality. Unwanted local melting of the strip may occur at higher temperatures. In the case of the arrangement of a descaling device before the finishing scale, the descaling results in an average temperature loss of about 70 ° C. before the pre-strip enters the finishing scale.
Die minimale Gießgeschwindigkeit, um eine Endwalztemperatur im austenitischen Gefügebereich von 8500C im letzten Walzgerüst zu erreichen, beträgt in dargestellten Fall 6,3 m/min bei einer Stahlstrangdicke von 70 mm am Austritt aus der Stranggießkokille. Die Vorstreifendicke nach dem Austritt aus der ersten Gruppe von drei Walzgerüsten beträgt 14 mm. Der Temperaturverlust an der Entzunderungseinrichtung beträgt in diesem Fall (Figur 2) ca. 95°C, die Einlauftemperatur in das erste Walzgerüst der Fertigstaffel liegt bei ca. 11100C.The minimum casting speed, to achieve a final rolling temperature in the austenitic structure area of 850 0 C in the last rolling stand, in the illustrated case is 6.3 m / min at a steel strand thickness of 70 mm at the outlet of the continuous casting mold. The pre-strip thickness after exit from the first group of three rolling stands is 14 mm. The temperature loss at the descaling device is in this case (Figure 2) about 95 ° C, the inlet temperature in the first rolling stand of the finishing scale is about 1110 0 C.
Daraus ergibt sich, dass für diese Stahlqualität bei Gießgeschwindigkeiten unter 6,3 m/min und den oben beschriebenen Randbedingungen eine Endwalztemperatur über 8500C nicht erreicht werden kann. Damit können auch die geforderten Qualitätsstandards, die sich aus der Gefügestruktur bei der Walzung ergeben, nicht erreicht werden.It follows that a final rolling temperature above 850 0 C can not be achieved for these steel quality at casting speeds below 6.3 m / min and the boundary conditions described above. Thus, the required quality standards, which result from the microstructure during rolling, can not be achieved.
Figur 3 zeigt den Temperaturverlauf bei einem Vorstreifen, bei dem die Entzunderung bereits vor dem Eintritt in die Schutzgaskammer erfolgt ist und der nach dem Austritt aus der Schutzgaskammer direkt in die Fertigstaffel eingesetzt wird. Hierbei ist die Schutzgaskammer 3,0 m vom Walzspalt des ersten Walzgerüstes entfernt. Alle anderen Randbedingungen (Stahlqualität, Enddicke, Ausgangstemperatur, etc.) entsprechen den Randbedingungen des Vergleichsbeispieles.FIG. 3 shows the temperature profile in the case of a pre-strip in which the descaling has already taken place before entry into the protective gas chamber and which, after emerging from the protective gas chamber, is inserted directly into the finishing scale. Here is the Protective gas chamber 3.0 m away from the nip of the first rolling stand. All other boundary conditions (steel quality, final thickness, starting temperature, etc.) correspond to the boundary conditions of the comparative example.
Ausgehend von ebenfalls 1250°C beim Austritt aus der Schutzgaskammer liegt die Einlauftemperatur in das erste Walzgerüst der Fertigstaffel nunmehr bei ca. 1 185°C. Eine weitere Steigerung der Einlauftemperatur um 20 bis 300C kann durch eine entsprechende thermische Isolation der Schutzgaskammer und des Austrittskanals bis nahe an das erste Walzgerüst der Fertigstaffel erreicht werden. Die minimale Gießgeschwindigkeit, um unter diesen Randbedingungen eine angestrebte Endwalztemperatur von 8500C zu erreichen, liegt in diesem Fall bei 5,8 m/min, also um 0,5 m/min weniger als bei der Anlagenkonfiguration gemäß dem Stand der Technik.Starting at 1250 ° C at the outlet from the protective gas chamber, the inlet temperature in the first rolling stand of the finishing scale is now at about 1 185 ° C. A further increase of the inlet temperature by 20 to 30 0 C can be achieved by a corresponding thermal insulation of the protective gas chamber and the outlet channel to close to the first rolling stand of the finishing scale. The minimum casting speed to achieve a desired final rolling temperature of 850 0 C, under these conditions, in this case at 5.8 m / min, that is to say 0.5 m / min less than in the system configuration according to the prior art.
Da nicht alle Stahlgüten mit gleich hohen Gießgeschwindigkeiten herstellbar sind, wird durch das vorgeschlagene Verfahren das Anwendungsgebiet und die Flexibilität der erfindungsgemäßen kombinierten Gieß- und Walzanlage deutlich erweitert. Since not all steel grades can be produced with equally high casting speeds, the field of application and the flexibility of the combined casting and rolling plant according to the invention are significantly expanded by the proposed method.

Claims

Patentansprüche: claims:
1. Verfahren zur Herstellung eines warmgewalzten Stahlbandes in Bunden oder in Tafeln aus einer Stahlschmelze in einem kontinuierlichen Fertigungsprozess bei ununterbrochenem Banddurchlauf mit folgenden Verfahrensschritten:1. A process for the production of a hot rolled steel strip in coils or in sheets from a molten steel in a continuous production process with uninterrupted strip pass with the following process steps:
- kontinuierliches Gießen eines Stahlstranges (5) in einer Stranggießkokille (2) einer Stranggießanlage (1 ),continuous casting of a steel strand (5) in a continuous casting mold (2) of a continuous casting plant (1),
- Walzverformen des gegossenen Stahlstranges in einer ersten Gruppe von Walzgerüsten (6) zu einem vorgewalzten Warmband (7),Rolling deformation of the cast steel strand in a first group of rolling stands (6) into a pre-rolled hot strip (7),
- Walzverformen des vorgewalzten Warmbandes in einer zweiten Gruppe von Walzgerüsten (19) zu einem warmgewalzten Stahlband (21 ),Roll-forming the rough-rolled hot strip in a second group of rolling stands (19) into a hot-rolled steel strip (21),
Einstellen des vorgewalzten Warmbandes auf Walztemperatur zwischen der ersten Gruppe von Walzgerüsten und der zweiten Gruppe von Walzgerüsten in einer Temperatureinstellvorrichtung (14),Setting the rough rolled hot strip to rolling temperature between the first group of rolling stands and the second group of rolling stands in a temperature adjusting device (14),
- Aufwickeln des warmgewalzten Stahlbandes zu Bunden oder Zerteilen des warmgewalzten Stahlbandes zu Tafeln, dadurch gekennzeichnet, dassWinding the hot rolled steel strip into coils or cutting the hot rolled steel strip into sheets, characterized in that
- das vorgewalzte Warmband unmittelbar vor dem Eintritt in die Tempertureinstelleinrichtung entzundert wird,the descaled hot-rolled strip is descaled immediately before entry into the temperature control device,
- das vorgewalzte Warmband in der Temperatureinstelleinrichtung in einer Schutzgasatmosphäre gehalten wird und- The pre-rolled hot strip is kept in the temperature setting in a protective gas atmosphere and
- das vorgewalzte Warmband nach Durchlaufen der Temperatureinstelleinrichtung unmittelbar nachfolgend in der zweiten Gruppe von Walzgerüsten walzverformt wird.- The pre-rolled hot strip after being passed through the temperature adjustment immediately following in the second group of rolling mills is roll formed.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das vorgewalzte Warmband in der Temperatureinstelleinrichtung in einer inerten Schutzgasatmosphäre mit einem Sauerstoffgehalt von weniger als 10 %, vorzugsweise einem Sauerstoffgehalt von weniger als 2 %, gehalten wird. 2. The method according to claim 1, characterized in that the pre-rolled hot strip in the temperature adjusting device in an inert inert gas atmosphere having an oxygen content of less than 10%, preferably an oxygen content of less than 2%, is maintained.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das vorgewalzte Warmband in der Temperatureinstelleinrichtung in einer reduzierenden Schutzgasatmosphäre gehalten wird.3. The method according to claim 1, characterized in that the pre-rolled hot strip is held in the temperature adjusting in a reducing inert gas atmosphere.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das vorgewalzte Warmband in der Temperatureinstellvorrichtung auf Walzeintrittstemperatur eingestellt wird.4. The method according to any one of the preceding claims, characterized in that the pre-rolled hot strip is set in the temperature adjusting device to roll inlet temperature.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das vorgewalzte Warmband in der Temperatureinstellvorrichtung in Abhängigkeit von der aktuellen Gießgeschwindigkeit auf eine Walzeintrittstemperatur eingestellt wird, die eine Endwalztemperatur in der letzten Verformungsstufe der zweiten Gruppe von Walzgerüsten zulässt, die im austenitischen Gefügebereich des Warmbandes liegt.5. The method according to claim 4, characterized in that the pre-rolled hot strip is set in the temperature adjusting depending on the actual casting speed to a roll inlet temperature, which allows a final rolling temperature in the last stage of the second set of rolling mills, which is in the austenitic microstructure of the hot strip ,
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das vorgewalzte Warmband vor dem Eintritt in die Temperatureinstelleinrichtung mit Wasserstrahlen bei einem Vordüsendruck zwischen 200 bar und 450 bar entzundert wird.6. The method according to any one of the preceding claims, characterized in that the pre-rolled hot strip is descaled prior to entering the temperature adjuster with water jets at a pre-nozzle pressure between 200 bar and 450 bar.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Walzverformen in der ersten Gruppe von Walzgerüsten durch mindestens ein Walzgerüst, vorzugsweise durch drei aufeinander folgende Walzgerüste, erfolgt.7. The method according to any one of the preceding claims, characterized in that the roll forming in the first group of rolling mills by at least one rolling stand, preferably by three successive rolling mills, takes place.
8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Walzverformen in der zweiten Gruppe von Walzgerüsten durch mindestens zwei, vorzugsweise drei bis fünf aufeinander folgende Walzgerüste erfolgt.8. The method according to any one of the preceding claims, characterized in that the roll forming takes place in the second group of rolling stands by at least two, preferably three to five successive rolling stands.
9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass9. The method according to any one of the preceding claims, characterized in that
- in der Stranggießkokille ein Stahlstrang mit einer Stahlstrangdicke zwischen 50 und 150 mm gegossen wird,- in the continuous casting mold a steel strand is cast with a steel strand thickness between 50 and 150 mm,
- der gegossene Stahlstrang in einer ersten Gruppe von Walzgerüsten zu einem vorgewalzten Warmband mit einer Warmbanddicke zwischen 6,0 und 30 mm walzverformt wird,the cast steel strand in a first group of rolling stands to a pre-rolled hot strip having a hot strip thickness of between 6.0 and 30 mm is rolled,
- das vorgewalzte Warmband in einer zweiten Gruppe von Walzgerüsten zu einem warmgewalzten Stahlband mit einer Stahlband-Enddicke zwischen 0,6 und 5,0 mm warmverformt wird.- The pre-rolled hot strip is thermoformed in a second group of rolling mills to a hot-rolled steel strip with a steel strip end thickness between 0.6 and 5.0 mm.
10. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das vorgewalzte Warmband zwischen der ersten Gruppe von Walzgerüsten und der Entzunderungseinrichtung quergeteilt wird.10. The method according to any one of the preceding claims, characterized in that the pre-rolled hot strip between the first group of rolling stands and the descaling device is divided transversely.
11. Kombinierte Gieß- und Walzanlage zur Durchführung des Verfahrens nach einen der Ansprüche 1 bis 10,11. Combined casting and rolling plant for carrying out the method according to one of claims 1 to 10,
- mit einer Stranggießkokille (2) in einer Stranggießanlage (1 ) zur Herstellung eines gegossenen Stahlstranges (5),with a continuous casting mold (2) in a continuous casting plant (1) for producing a cast steel strand (5),
- mit einer ersten Gruppe von Walzgerüsten (6) zum Walzverformen des gegossenen Stahlstranges zu einem vorgewalzten Warmband (7),with a first group of rolling mills (6) for roll forming the cast steel strand into a pre-rolled hot strip (7),
- mit einer zweiten Gruppe von Walzgerüsten (19) zum Walzverformen des vorgewalzten Warmbandes zu einem warmgewalzten Stahlband (21 ),with a second group of rolling stands (19) for roll-forming the rough-rolled hot strip into a hot-rolled steel strip (21),
- mit einer Temperatureinstelleinrichtung (14) zwischen der ersten Gruppe von Walzgerüsten (6) und der zweiten Gruppe von Walzgerüsten (19) und- With a temperature adjusting device (14) between the first group of rolling stands (6) and the second group of rolling stands (19) and
- mit einer Bandhaspeleinrichtung (23) zum Aufwickeln des warmgewalzten Stahlbandes zu Bunden oder mit einer Zerteileinrichtung zum Zerteilen des warmgewalzten Stahlbandes zu Tafeln, dadurch gekennzeichnet, dass- With a band reeling device (23) for winding the hot rolled steel strip into coils or with a dicing device for cutting the hot rolled steel strip into sheets, characterized in that
- die Temperatureinstelleinrichtung (14) in einer geschlossenen Schutzgaskammer (1 1 ) angeordnet ist, die mit Eintritts- und Austrittsöffnungen (12, 13) für das vorgewalzte Warmband und mit Versorgungsleitungen (16, 17) für ein Schutzgas ausgestattet ist,- The temperature adjusting device (14) in a closed protective gas chamber (1 1) is arranged, which is equipped with inlet and outlet openings (12, 13) for the pre-rolled hot strip and with supply lines (16, 17) for a protective gas,
- eine Entzunderungseinrichtung (9) der Schutzgaskammer (11 ) unmittelbar vorgelagert ist,a descaling device (9) is located directly upstream of the protective gas chamber (11),
- die zweite Gruppe von Walzgerüsten (19) unmittelbar an die Schutzgaskammer (1 1 ) anschließt.- The second group of rolling stands (19) directly to the protective gas chamber (1 1) connects.
12. Kombinierte Gieß- und Walzanlage nach Anspruch 11 , dadurch gekennzeichnet, dass die Temperatureinstelleinrichtung (14) von einer Induktionsheizeinrichtung (15) gebildet ist. 12. Combined casting and rolling plant according to claim 11, characterized in that the temperature adjusting device (14) by an induction heating device (15) is formed.
13. Kombinierte Gieß- und Walzanlage nach Anspruch 1 1 oder 12, dadurch gekennzeichnet, dass die Entzunderungseinrichtung (9) von mindestens einer Rotorentzunderungseinrichtung (10) gebildet ist.13. Combined casting and rolling plant according to claim 1 1 or 12, characterized in that the descaling device (9) of at least one Rotorentzunderungseinrichtung (10) is formed.
14. Kombinierte Gieß- und Walzanlage nach Anspruch 13, dadurch gekennzeichnet, dass mehrere Rotorentzunderungseinrichtungen (10) parallel zur Eintrittsöffnung (12) der Schutzgaskammer (1 1 ) unmittelbar vor dieser angeordnet sind.14. Combined casting and rolling plant according to claim 13, characterized in that several Rotorentzunderungseinrichtungen (10) parallel to the inlet opening (12) of the protective gas chamber (1 1) are arranged directly in front of this.
15. Kombinierte Gieß- und Walzanlage nach einem der Ansprüche 1 1 bis 14, dadurch gekennzeichnet, dass die erste Gruppe von Walzgerüsten (6) von mindestens einem Walzgerüst, vorzugsweise von drei aufeinander folgenden Walzgerüsten (6a, 6b, 6c), gebildet ist.15. Combined casting and rolling plant according to one of claims 1 to 14, characterized in that the first group of rolling stands (6) of at least one rolling stand, preferably of three successive rolling stands (6a, 6b, 6c) is formed.
16. Kombinierte Gieß- und Walzanlage nach einem der Ansprüche 11 bis 15, dadurch gekennzeichnet, dass die zweite Gruppe von Walzgerüsten (19) von mindestens zwei Walzgerüsten, vorzugsweise von drei bis fünf Walzgerüsten (19a, 19b, 19c, 19d), gebildet ist.16. Combined casting and rolling plant according to one of claims 11 to 15, characterized in that the second group of rolling stands (19) of at least two rolling stands, preferably from three to five rolling stands (19a, 19b, 19c, 19d) is formed ,
17. Kombinierte Gieß- und Walzanlage nach einem der Ansprüche 11 bis 16, dadurch gekennzeichnet, dass die Austrittsöffnung (13) der Schutzgaskammer (11 ) einen Austrittskanal (18) umfasst, der maximal 5,0 m, vorzugsweise maximal 3,0 m, vor dem Walzspalt (20) des ersten Walzgerüstes (19a) der zweiten Gruppe von Walzgerüsten (19) endet.17. Combined casting and rolling plant according to one of claims 11 to 16, characterized in that the outlet opening (13) of the protective gas chamber (11) comprises an outlet channel (18) which is at most 5.0 m, preferably at most 3.0 m, before the nip (20) of the first rolling stand (19a) of the second group of rolling stands (19) ends.
18. Kombinierte Gieß- und Walzanlage nach einem der Ansprüche 1 1 bis 17, dadurch gekennzeichnet, dass eine Querteilschere (24) zwischen der ersten Gruppe von Walzgerüsten (6) und der Entzunderungseinrichtung (9) zum Querteilen des vorgewalzten Warmbandes angeordnet ist. 18. Combined casting and rolling plant according to one of claims 1 to 17, characterized in that a transverse dividing shear (24) is arranged between the first group of rolling stands (6) and the descaling device (9) for cutting the pre-rolled hot strip.
EP06818359.9A 2005-11-09 2006-11-03 Method for producing a hot-rolled steel strip and combined casting and rolling installation for carrying out the method Not-in-force EP1951451B2 (en)

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AT0183005A AT504782B1 (en) 2005-11-09 2005-11-09 METHOD FOR PRODUCING A HOT-ROLLED STEEL STRIP AND COMBINED CASTING AND ROLLING MACHINE TO PERFORM THE METHOD
PCT/EP2006/010553 WO2007054237A1 (en) 2005-11-09 2006-11-03 Method for producing a hot-rolled steel strip and combined casting and rolling installation for carrying out the method

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EP1951451B1 (en) 2010-03-24
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CA2628499A1 (en) 2007-05-18
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