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EP2467221A1 - Method for producing a hot-rolled strip by means of strip casting, wherein the material properties can be adjusted over the strip cross-section - Google Patents

Method for producing a hot-rolled strip by means of strip casting, wherein the material properties can be adjusted over the strip cross-section

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Publication number
EP2467221A1
EP2467221A1 EP10749463A EP10749463A EP2467221A1 EP 2467221 A1 EP2467221 A1 EP 2467221A1 EP 10749463 A EP10749463 A EP 10749463A EP 10749463 A EP10749463 A EP 10749463A EP 2467221 A1 EP2467221 A1 EP 2467221A1
Authority
EP
European Patent Office
Prior art keywords
strip
gas
material properties
plasma jet
casting
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
EP10749463A
Other languages
German (de)
French (fr)
Other versions
EP2467221B1 (en
Inventor
Karl-Heinz Spitzer
Volker Flaxa
Joachim Kroos
Hellfried Eichholz
Markus SCHÄPERKÖTTER
Rune SCHMIDT-JÜRGENSEN
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.)
Salzgitter Flachstahl GmbH
Original Assignee
Salzgitter Flachstahl GmbH
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Publication date
Application filed by Salzgitter Flachstahl GmbH filed Critical Salzgitter Flachstahl GmbH
Publication of EP2467221A1 publication Critical patent/EP2467221A1/en
Application granted granted Critical
Publication of EP2467221B1 publication Critical patent/EP2467221B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt

Definitions

  • Vehicle components on the other hand, but also a passive safety of the passengers promoting behavior of the individual components with high static and dynamic stresses during operation and in the event of a crash.
  • Such steel sheets or strips must meet comparatively high requirements in terms of strength, ductility, toughness, energy absorption and processability, for example by cold forming, welding and / or surface treatment.
  • the abandoned melt solidifies to a pre-strip with a thickness in the range between 6 - 20 mm. After solidification, the pre-strip is subjected to a hot rolling process.
  • the object of the invention is to specify a method for producing composite materials with a steel matrix by means of horizontal strip casting, with which the required material properties can be set variably over the strip cross section.
  • These may, for example, also be alloying elements in which the solubility in the iron is limited at normal liquidus temperatures and which, therefore, over conventional production processes due to material incompatibilities, metallurgical
  • Demixing, evaporation, etc. are not or only partially introduced into the matrix.
  • the gas jet solid particles such. As metal or ceramic particles are added (aerosols), so that are provided with corresponding novel properties with the inventive method completely novel composite or gradient materials.
  • the gas z. B. from N 2l CO, C0 2 , inert or reducing gases and, depending on requirements cold or preheated impinge on the molten bath surface.
  • the gas molecules diffuse starting from the strip surface with a specifically adjustable gradient in the strip thickness direction and correspondingly influence the material properties of the solidified strip.
  • a hardness gradient can be set in a targeted manner via the strip thickness.
  • the plasma z. B. also consist of metal vapors, which any alloying elements can be introduced into the material in order to influence the material properties targeted. This can be z. B. Cr to improve the corrosion properties or Si, the soft magnetic
  • the gas or plasma jet is applied over the entire width of the casting belt or is variably adjustable.
  • the loading of the strip with a gas or plasma jet can not only be used for introducing elements into the strip material but also advantageously the energy contained in the plasma jet can be used, for example, elements already introduced by a gas jet
  • Figure 1 is a schematic representation of a horizontal strip casting
  • the surface solidification of the cast strand has already begun.
  • the porous surface makes it possible for atoms deposited at this point to diffuse from the medium (eg gases or vapors) from the surface into the solid material.

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

Abstract

The invention relates to a method for producing hot-rolled strip made of steel and having material properties that can be adjusted over the strip cross-section, wherein a steel melt is output onto a circulating casting belt of a horizontal strip casting system by means of a gutter, wherein said steel melt solidifies to form a preliminary strip having a thickness of between 6 and 20 mm, and the preliminary strip is subjected to a hot rolling process after complete solidification. A gas jet or plasma jet composed of metal and/or non-metal elements that affect the material properties of the hot-rolled strip influences the steel melt that is still liquid and/or just at the start of solidification, wherein the concentration of the elements introduced into the melt by means of the gas jet or plasma jet and diffusing into the melt is adjusted over the strip thickness and strip width by changing the influencing kinetic energy of the partial gas pressure and/or the applied temperature.

Description

Verfahren zum Erzeugen von Warmband mittels Bandgießen mit über den Bandquerschnitt einstellbaren Werkstoffeigenschaften  Method for producing hot strip by means of strip casting with adjustable over the strip cross-section material properties
Beschreibung description
Die Erfindung betrifft ein Verfahren zum Erzeugen von Warmband mittels Bandgießen mit über den Bandquerschnitt einstellbaren Werkstoffeigenschaften gemäß dem Oberbegriff des Anspruches 1. The invention relates to a method for producing hot strip by means of strip casting with adjustable over the strip cross-section material properties according to the preamble of claim 1.
Der stark umkämpfte Automobilmarkt zwingt die Hersteller ständig, nach Lösungen zur Senkung des Flottenverbrauchs unter Beibehaltung eines höchstmöglichen Komforts und Insassenschutzes zu suchen. Dabei spielt einerseits die Gewichtsersparnis aller The highly competitive automotive market is constantly forcing manufacturers to seek solutions to reduce fleet consumption while maintaining the highest possible comfort and occupant safety. On the one hand, the weight savings of all play
Fahrzeugkomponenten eine entscheidende Rolle andererseits aber auch ein die passive Sicherheit der Passagiere förderndes Verhalten der einzelnen Bauteile bei hohen statischen und dynamischen Beanspruchungen im Betrieb und im Crashfall. Vehicle components on the other hand, but also a passive safety of the passengers promoting behavior of the individual components with high static and dynamic stresses during operation and in the event of a crash.
Die Vormaterial-Lieferanten versuchen diesen Anforderungen durch die Bereitstellung belastungsoptimierter Bleche oder Bänder aus Stahl (z. B. Taylored welded oder Taylored rolled Blanks) Rechnung zu tragen, die entsprechend den zu erwartenden Belastungen blechdickenoptimiert sind oder aus unterschiedlich festen Werkstoffen bestehen. The primary material suppliers try to meet these requirements by providing load-optimized steel sheets or strips (eg Taylored welded or Taylored rolled blanks), which are optimized for sheet thickness according to the expected loads or consist of materials of different strengths.
Derartige Bleche oder Bänder aus Stahl müssen vergleichsweise hohen Anforderungen hinsichtlich Festigkeit, Dehnfähigkeit, Zähigkeit, Energieaufnahme und Verarbeitbarkeit beispielsweise durch Kaltumformen, Schweißen und/oder Oberflächenbehandeln, genügen. Such steel sheets or strips must meet comparatively high requirements in terms of strength, ductility, toughness, energy absorption and processability, for example by cold forming, welding and / or surface treatment.
Nachteilig bei der Herstellung belastungsoptimierter Bleche aus Stahl sind bei den geschweißten Blechplatinen die aufwändigen Schneid- und Fügeprozesse sowie scharfe Eigenschaftsgradienten beim Werkstoffübergang. Ein Verfahren zum Herstellen eines Verbundbandes aus Stahl ist z. B. aus der DE 101 24 594 A1 bekannt. Hiernach wird ein nach dem Zweirollenverfahren direkt gegossenes ferritisches Kernband mit einem austenitischen oder hochlegierten ferritischen A disadvantage in the production of load-optimized steel sheets are the elaborate cutting and joining processes and sharp property gradients in the material transition in the welded sheet metal blanks. A method for producing a composite steel strip is z. B. from DE 101 24 594 A1. Thereafter, a directly cast by the two-roll ferritic core band with an austenitic or high-alloy ferritic
Plattierungsband plattiert.  Plating tape plated.
Nachteil ist hier der durch die Plattierung bedingte scharfe Sprung der Eigenschaften des Verbundwerkstoffes, der die den jeweiligen Anforderungen entsprechende optimale Disadvantage here is caused by the plating sharp jump in the properties of the composite material, which corresponds to the respective requirements optimal
Anpassung der Eigenschaften über die Banddicke erschwert. Des Weiteren können die Eigenschaften über die Bandbreite nicht variiert werden. Adjusting the properties over the tape thickness difficult. Furthermore, the properties can not be varied over the bandwidth.
Ein Verfahren zum Erzeugen von Warmbändern aus Leichtbaustahl mittels einer A method for producing mild steel hot strip by means of a
horizontalen Bandgießanlage ist z. B. aus der Fachzeitschrift steel research 74 (2003), No. 11/12, page 724 - 731, bekannt. Bei diesem Verfahren wird Schmelze aus einem horizontal strip casting is z. B. from the journal steel research 74 (2003), no. 11/12, page 724-731. In this process, melt from a
Zulaufgefäß über eine Gießrinne auf ein umlaufendes Gießband einer horizontalen Feed vessel via a trough on a continuous casting belt of a horizontal
Bandgießanlage aufgegeben. Durch intensive Kühlung des Gießbandes erstarrt die aufgegebene Schmelze zu einem Vorband mit einer Dicke im Bereich zwischen 6 - 20 mm. Nach der Durcherstarrung wird das Vorband einem Warmwalzprozess unterzogen. Abandoned caster. By intensive cooling of the casting belt, the abandoned melt solidifies to a pre-strip with a thickness in the range between 6 - 20 mm. After solidification, the pre-strip is subjected to a hot rolling process.
Mit diesem Verfahren lassen sich in idealer Weise z. B. hochmanganhaltige Leichtbaustähle herstellen, die sich über konventionelle Verfahren, wie Stranggießen, nur schwer erzeugen lassen. With this method can be in an ideal way z. B. produce high manganese lightweight steels that can be difficult to produce over conventional methods, such as continuous casting.
Die Druckschrift DE 199 18 581 A1 offenbart das Gießen von dünnen Bändern aus The document DE 199 18 581 A1 discloses the casting of thin strips
Kohlenstoffstählen, wobei die Bandfestigkeit dadurch erhöht wird, dass man das Band einer Carburierung- oder Nitrierungs-Behandlung unterwirft. Dies kann direkt nach dem Gießen erfolgen oder nach dem Gießen und anschließenden Kaltwalzen und Glühen. Carbon steels, wherein the strip strength is increased by subjecting the strip to a carburizing or nitriding treatment. This can be done directly after casting or after casting and subsequent cold rolling and annealing.
Bislang ist es mit diesen bekannten Bandgießverfahren jedoch nicht möglich Warmbänder aus Stahl herzustellen, die über den Bandquerschnitt belastungsoptimierte So far, however, it has not been possible with these known strip casting methods to produce hot strips of steel that are stress-optimized over the strip cross section
Werkstoffeigenschaften aufweisen. Have material properties.
Aufgabe der Erfindung ist es, ein Verfahren zum Erzeugen von Verbundwerkstoffen mit einer Stahlmatrix mittels horizontalem Bandgießen anzugeben, mit dem über den Bandquerschnitt die geforderten Werkstoffeigenschaften variabel eingestellt werden können.  The object of the invention is to specify a method for producing composite materials with a steel matrix by means of horizontal strip casting, with which the required material properties can be set variably over the strip cross section.
Diese Aufgabe wird ausgehend vom Oberbegriff in Verbindung mit den kennzeichnenden Merkmalen des Anspruches 1 gelöst. Vorteilhafte Weiterbildungen sowie eine Vorrichtung zum Erzeugen von Warmbändern sind Gegenstand von Unteransprüchen. Nach der Lehre der Erfindung wirkt auf die noch flüssige und/oder gerade im Erstarrungsbeginn befindliche Stahlschmelze ein aus metallischen und/oder This object is achieved starting from the preamble in conjunction with the characterizing features of claim 1. Advantageous developments and an apparatus for producing hot strips are the subject of dependent claims. According to the teachings of the invention acts on the still liquid and / or just in the beginning of solidification molten steel from a metallic and / or
nichtmetallischen, die Werkstoffeigenschaften des Warmbandes beeinflussenden Elementen bestehender Gas- oder Plasmastrahl ein, wobei durch Veränderung der einwirkenden kinetischen Energie des Gas- oderPlasmastrgls, des Gas-Partialdrucks und/oder der anliegenden Temperatur die Konzentration der über den Gas- oder Plasmastrahl in die Schmelze eingebrachten und dort eindiffundierenden Elemente über die Banddicke und Bandbreite eingestellt wird. non-metallic, the material properties of the hot strip influencing elements existing gas or plasma jet, wherein the concentration of the introduced via the gas or plasma jet in the melt by changing the acting kinetic energy of the gas or plasma, the gas partial pressure and / or the applied temperature and there diffusing elements on the tape thickness and bandwidth is set.
Bei dem beschriebenen Verfahren wird also nicht das Einbringen von Gasbläschen in die Matrix angestrebt, sondern durch das geometrische Eindringen des Gas- oder Plasmastrahls in das noch flüssige oder gerade im Erstarrungsbeginn befindliche Schmelzbad diffundieren die mit dem Gas oder Plasma transportierten Moleküle oder Teilchen in die Matrix ein und beeinflussen so die Werkstoffeigenschaften. In the described method, therefore, the introduction of gas bubbles is not sought in the matrix, but by the geometric penetration of the gas or plasma jet in the still liquid or just beginning of solidification melt diffuse the transported with the gas or plasma molecules or particles in the matrix and thus influence the material properties.
Das erfindungsgemäße Verfahren ist grundsätzlich für die Erzeugung von Warmbändern aus den verschiedensten metallischen Werkstoffen geeignet, insbesondere auch für hochlegierte Leichtbaustähle. The inventive method is basically suitable for the production of hot strips of various metallic materials, especially for high-alloy lightweight steels.
Das erfindungsgemäße Verfahren bietet erstmals in vorteilhafter Weise die Möglichkeit den spezifischen Anforderungen an die Werkstoffeigenschaften des fertigen Bauteils gezielt Rechnung zu tragen, in dem diese sowohl über die Banddicke wie auch über die Bandbreite gezielt eingestellt werden können.  The method according to the invention offers for the first time in an advantageous manner the possibility of specifically taking into account the specific requirements of the material properties of the finished component, in which these can be adjusted in a targeted manner both via the strip thickness and over the strip width.
Hierbei werden gasförmige, dampfförmige oder im Zustand des Plasmas befindliche  These are gaseous, vapor or in the state of the plasma
Legierungsbestandteile mittels dem Zweck entsprechender Abscheidungsverfahren auf die Matrix der noch flüssigen oder gerade in beginnender Erstarrung befindlichen Stahlschmelze aufgebracht, wobei die im Gas bzw. Plasmadampf enthaltenen metallischen und/oder nicht metallischen Elemente in die Matrix eindiffundieren. Alloy components applied by means of the purpose of appropriate deposition process on the matrix of the still liquid or just beginning to solidification molten steel, wherein the contained in the gas or plasma vapor metallic and / or non-metallic elements diffuse into the matrix.
Dies können beispielsweise auch Legierungselemente sein, bei denen die Löslichkeit im Eisen bei üblichen Liquidustemperaturen begrenzt ist und die damit über herkömmliche Produktionsverfahren aufgrund von Materialunverträglichkeiten, metallurgischer  These may, for example, also be alloying elements in which the solubility in the iron is limited at normal liquidus temperatures and which, therefore, over conventional production processes due to material incompatibilities, metallurgical
Entmischung, Abdampfen, etc. gar nicht oder nur begrenzt in die Matrix einbringbar sind. Demixing, evaporation, etc. are not or only partially introduced into the matrix.
Außerdem können dem Gasstrahl Feststoffpartikel, wie z. B. Metall- oder Keramikpartikel, zugesetzt werden (Aerosole), so dass mit dem erfindungsgemäßen Verfahren völlig neuartige Verbund- bzw. Gradientenwerkstoffe mit entsprechend neuen Eigenschaften bereitgestellt werden. Bei Einsatz eines Gasstrahls kann das Gas z. B. aus N2l CO, C02, inerten oder reduzierenden Gasen bestehen und je nach Anforderungen kalt oder vorgewärmt auf die Schmelzbadoberfläche auftreffen. In addition, the gas jet solid particles such. As metal or ceramic particles are added (aerosols), so that are provided with corresponding novel properties with the inventive method completely novel composite or gradient materials. When using a gas jet, the gas z. B. from N 2l CO, C0 2 , inert or reducing gases and, depending on requirements cold or preheated impinge on the molten bath surface.
Durch Einstellung der kinetischen Energie des Gas-Partialdrucks und ggf. der Temperatur diffundieren die Gasmoieküle ausgehend von der Bandoberfläche mit einem auf diese Weise gezielt einstellbaren Gradienten in Banddickenrichtung und beeinflussen entsprechend die Werkstoffeigenschaften des erstarrten Bandes. Bei Verwendung von N2, CO oder C02 kann beispielsweise über die Banddicke gezielt ein Härtegradient eingestellt werden. By adjusting the kinetic energy of the gas partial pressure and, if appropriate, the temperature, the gas molecules diffuse starting from the strip surface with a specifically adjustable gradient in the strip thickness direction and correspondingly influence the material properties of the solidified strip. When using N 2 , CO or C0 2 , for example, a hardness gradient can be set in a targeted manner via the strip thickness.
Bei Einsatz eines heißen Plasmastrahls kann das Plasma z. B. auch aus Metalldämpfen bestehen, womit beliebige Legierungselemente in den Werkstoff eingebracht werden können, um die Werkstoffeigenschaften gezielt zu beeinflussen. Dies kann z. B. Cr sein, um die Korrosionseigenschaften zu verbessern oder Si, um die weichmagnetischen When using a hot plasma jet, the plasma z. B. also consist of metal vapors, which any alloying elements can be introduced into the material in order to influence the material properties targeted. This can be z. B. Cr to improve the corrosion properties or Si, the soft magnetic
Eigenschaften oder die Zunderbeständigkeit zu verbessern oder Kupfer, um in ausgewählten Materialbereichen den elektrischen Widerstand zu reduzieren. To improve properties or the scale resistance or copper, in order to reduce the electrical resistance in selected material areas.
Grundsätzlich sind bei der Wahl der nichtmetallischen oder metallischen Elemente keine Grenzen gesetzt, um ein in Bezug auf die geforderten Eigenschaften optimiertes Warmband im Sinne eines Verbund- oder Gradientenwerkstoffes bereitzustellen. In principle, there are no limits in the choice of non-metallic or metallic elements in order to provide a hot strip optimized in relation to the required properties in the sense of a composite or gradient material.
Vorteilhafterweise erfolgt die Gas- bzw. Plasmastrahlbeaufschlagung über die ganze Breite des Gießbandes bzw. ist variabel einstellbar. Advantageously, the gas or plasma jet is applied over the entire width of the casting belt or is variably adjustable.
Hierzu wird mit einer entsprechenden Anzahl an Zuleitungspunkten, z. B. Gasdüsen oder Plasmabrennern, das Gießband über die Breite nur partiell an den geforderten Stellen oder über die gesamte Breite beaufschlagt. For this purpose, with a corresponding number of supply points, z. As gas nozzles or plasma torches, the casting belt across the width only partially applied to the required locations or over the entire width.
Vorteilhaft können über eine variable Gas- bzw. Plasmastrahlbeaufschlagung auch die Werkstoffeigenschaften über die Länge des gegossenen Bandes eingestellt werden. Dies kann beispielsweise dadurch erreicht werden, dass während des Bandtransportes im Zuge der Erstarrung die im Regelfall ortsfest angeordnete Gas- bzw. Plasmastrahlbeaufschlagung an- oder abgeschaltet wird, bzw. in ihrer Intensität stufenlos oder gestuft gesteuert wird. Advantageously, the material properties over the length of the cast strip can be adjusted via a variable gas or plasma jet. This can be achieved, for example, by activating or deactivating the gas or plasma jet loading which is normally arranged in a stationary manner during the transport of the strip, or steers in its intensity steplessly or stepwise.
Die Beaufschlagung des Bandes mit einem Gas- bzw. Plasmastrahl kann dabei nicht nur zum Einbringen von Elementen in den Bandwerkstoff genutzt werden sondern es kann auch vorteilhaft die im Plasmastrahl enthaltene Energie beispielsweise dazu genutzt werden, bereits durch einen Gasstrahl eingebrachte Elemente einer gezielten The loading of the strip with a gas or plasma jet can not only be used for introducing elements into the strip material but also advantageously the energy contained in the plasma jet can be used, for example, elements already introduced by a gas jet
Wärmebehandlung zu unterziehen um beispielweise eine Diffusionsverstärkung zu erzielen. Somit können mit dem Plasmastrahl z. B. gezielt„Spuren" mit veränderten Werkstoffeigenschaften in das Band eingebracht werden. Heat treatment to undergo, for example, a diffusion gain achieve. Thus, with the plasma jet z. B. targeted "traces" are introduced with altered material properties in the band.
Zusammenfassend ergeben sich aus der Erfindung folgende Vorteile: In summary, the invention provides the following advantages:
• Einstellung benötigter Oberflächeneigenschaften durch teure Legierungselemente nur in der Oberfläche - wirtschaftlicher Materialaufbau durch kostengünstigen • Adjustment of required surface properties by expensive alloying elements only in the surface - cost-effective material build-up
Kernwerkstoff  Core material
Gezielt beeinflusst werden können: Can be targeted:
- Verschleiß/Abrieb/Tribologie  - Wear / Abrasion / Tribology
- Zunderbeständigkeit  Scaling resistance
- Korrosionsschutz  - corrosion protection
- Beschichtbarkeit  - coatability
- Beklebbarkeit  - adhesiveness
- elektrische Eigenschaften  - Electrical Properties
- Schweißbarkeit (Widerstandspunktschweißbarkeit)  - weldability (resistance spot weldability)
- thermische Eigenschaften (Bimetall)  - thermal properties (bimetal)
- optische Eigenschaften (Aussehen)  - optical properties (appearance)
• Realisierung von Kombinationen unterschiedlicher Oberflächen- und • realization of combinations of different surface and
Materialkerneigenschaften  Material core properties
« Nutzung bereichsweise verschiedener Verfestigungsmechanismen, wie z. B. "Use of different types of solidification mechanisms, such. B.
Mischkristallverfestigung und Ausscheidungen zur Erzeugung von Festigkeitsgradienten bzw. ortsspezifischer verformungs- bzw. Crasheigenschaften.  Solid-solution hardening and precipitations to produce strength gradients or site-specific deformation or crash properties.
In einer Zeichnung wird das erfindungsgemäße Verfahren näher erläutert. Es zeigen: In a drawing, the inventive method is explained in detail. Show it:
Figur 1 die schematische Darstellung einer horizontalen Bandgießanlage mit  Figure 1 is a schematic representation of a horizontal strip casting with
Einwirkstellen für die Gas- oder Plasmastrahlen zur Beeinflussung der Werkstoffeigenschaften,  Contact points for the gas or plasma jets for influencing the material properties,
Figur 2 einstellbare Konzentrationen bzw. Elementverteilungen über die Blechdicke. In Figur 1 sind in der schematischen Darstellung einer horizontalen Bandgießanlage die prinzipiell möglichen Einwirkstellen für die Gas- oder Plasmastrahlen zur gezielten Figure 2 adjustable concentrations or element distributions over the sheet thickness. In Figure 1 are in the schematic representation of a horizontal strip casting the principle possible Einwirkstellen for the gas or plasma jets targeted
Beeinflussung der Werkstoffeigenschaften des Stahlbandes dargestellt. Influencing the material properties of the steel strip shown.
Zu erkennen ist ein Schmelzgefäß 1 aus dem flüssige Stahlschmelze 8 über ein Zulaufgefäß 2 einer Gießrinne 3 zugeführt wird, so dass die Schmelze 8 durch eine Gießdüse 4 auf ein um eine vordere Umlenkrolle 6 und hintere Umlenkrolle 7 umlaufendes Gießband 5 aufgegeben wird. Abgestützt wird das Gießband 5 zwischen den Umlenkrollen 6 und 7 von Tragrollen 9 zwischen denen zur Bandkühlung Kühldüsen 10 angeordnet sind. Die dargestellten Rotationspfeile an den Umlenkrollen 6 und 7 kennzeichnen die Förderrichtung des erstarrenden Gießstrangs 11. To recognize a melting vessel 1 is fed from the liquid molten steel 8 via a feed vessel 2 of a runner 3, so that the melt 8 is fed through a pouring nozzle 4 on to a front guide roller 6 and rear guide roller 7 encircling casting belt 5. The casting belt 5 is supported between the deflecting rollers 6 and 7 by carrying rollers 9 between which cooling nozzles 10 are arranged for belt cooling. The illustrated rotation arrows on the deflection rollers 6 and 7 characterize the conveying direction of the solidifying cast strand 11.
Die möglichen Einwirkstellen des Gas- oder Plasmastrahls auf den Gießstrang sind mit I und II gekennzeichnet. The possible contact points of the gas or plasma jet on the cast strand are marked with I and II.
Bei der Einwirkstelle I ist die Schmelze auch an der Strangoberseite noch flüssig. Durch das Eindringen des Fördermediums (z. B. mittels eines Gas- oder Plasmastrahls) in das noch flüssige Schmelzbad wird die Schmelze mit gas-/dampf-förmigen metallischen und/oder nichtmetallischen Elementen geimpft und infolge der auf die Schmelze durch das At the contact point I, the melt is still liquid at the top of the strand. As a result of the penetration of the conveyed medium (for example by means of a gas jet or plasma jet) into the still molten bath, the melt is inoculated with gas / vapor-shaped metallic and / or non-metallic elements and, as a result, by the melt
Fördermedium ausgeübten Druck erzeugten Strömungen in der Schmelze gesteuert durchmischt. Die damit erreichte größere Oberfläche und Schaffung von neuen Oberflächen hat eine Steigerung der eindiffundierbaren Teilchenmenge zur Folge. Fluid applied pressure generated flows in the melt controlled mixed. The resulting larger surface area and creation of new surfaces results in an increase in the diffusible amount of particles.
Mittels eines in Gießrichtung folgenden elektromagnetischen Querrührers kann eine weitere Durchmischung durch Verteilung der bereits eindiffundierten Teilchen bzw. die Erhöhung der eindiffundierten Menge durch die Schaffung neuer Oberflächen erreicht werden. By means of an electromagnetic transverse stirrer following in the casting direction, a further thorough mixing can be achieved by distributing the already diffused particles or increasing the amount diffused in by creating new surfaces.
Im Bereich der Einwirkstelle II hat die Oberseitenerstarrung des Gießstranges bereits eingesetzt. Die porös gehaltene Oberfläche ermöglicht, dass an dieser Stelle aus dem Fördermedium (z. B. Gase oder Dämpfe) abgeschiedene Atome von der Oberfläche in das feste Material diffundieren können. In the area of exposure point II, the surface solidification of the cast strand has already begun. The porous surface makes it possible for atoms deposited at this point to diffuse from the medium (eg gases or vapors) from the surface into the solid material.
Die Beaufschlagung des Bandes mit Gas- oder Plasmastrahlen kann dabei entweder an einer der beiden Einwirkstellen erfolgen oder an beiden gemeinsam sowohl zeitlich versetzt, als auch gleichzeitig. Mit einer zusätzlichen variablen Beaufschlagung über Bandbreite und -länge lassen sich die vielfältigsten Anforderungen hinsichtlich der geforderten Werkstoffeigenschaften erzielen. Somit können die Werkstoff- bzw. späteren Bauteileigenschaften im Band quasi ortsgenau eingestellt werden. The admission of the band with gas or plasma jets can take place either at one of the two contact points or at both together both offset in time, and simultaneously. With an additional variable loading over bandwidth and length, the most varied requirements with regard to the required material properties can be achieved. Thus, the material or later component properties in the band can be set quasi precise location.
Mit den beschriebenen Aufgabepositionen lassen sich die in Figur 2 dargestellten With the described task positions can be shown in FIG
Konzentrationen bzw. Verteilungen über der Banddicke einstellen: Set concentrations or distributions over the strip thickness:
Aufqabeposition I -> Verteilung A): Gradientenwerkstoffe mit stetigem einseitigem Aufqabeposition I -> distribution A): gradient materials with continuous one-sided
Oberflächengradient. Dieser sich aus der Diffusion ergebende Gradient kann durch die kinetische Energie des Gas- bzw. Plasmastrahls, den Gas-Partialdruck sowie die anliegende Temperatur (Diffusionsgeschwindigkeit ist temperaturabhängig) eingestellt werden. Surface gradient. This gradient resulting from the diffusion can be adjusted by the kinetic energy of the gas or plasma jet, the gas partial pressure and the applied temperature (diffusion rate is temperature-dependent).
Aufqabeposition II - Verteilung B): Verbundwerkstoffe mit einseitiger sprunghafter Aufqabeposition II - Distribution B): composites with one-sided erratic
Verteilungsänderung außen. Distribution change outside.
Bezugszeichenliste LIST OF REFERENCE NUMBERS

Claims

Patentansprüche claims
1. Verfahren zum Erzeugen von Warmband aus Stahl mit über den Bandquerschnitt einstellbaren Werkstoffeigenschaften, wobei eine Stahlschmelze mittels einer Gießrinne auf ein umlaufendes Gießband einer horizontalen Bandgießanlage aufgegeben wird, die zu einem Vorband mit einer Dicke zwischen 6 bis 20 mm erstarrt und das Vorband nach der Durcherstarrung einem Warmwalzprozess unterzogen wird  1. A method for producing hot strip of steel with adjustable over the strip cross-section material properties, wherein a molten steel is fed by means of a runner on a revolving casting belt a horizontal strip casting, which solidifies to a pre-strip with a thickness between 6 to 20 mm and the pre-strip after the Through solidification is subjected to a hot rolling process
dadurch gekennzeichnet,  characterized,
dass auf die noch flüssige und/oder gerade im Erstarrungsbeginn befindliche Stahlschmelze ein aus metallischen und/oder nichtmetallischen die  that on the still liquid and / or just in the beginning of solidification molten steel one of metallic and / or non-metallic the
Werkstoffeigenschaften des Warmbandes beeinflussenden Elementen bestehender Gas- oder Plasmastrahl einwirkt und durch Veränderung der einwirkenden kinetischen Energie des Gas- oder Plasmastrahls, des Gas-Partialdrucks und/oder der anliegenden Temperatur die Konzentration der über den Gas- oder Plasmastrahl in die Schmelze eingebrachten und dort eindiffundierenden Elemente über die Banddicke und Bandbreite eingestellt wird.  Material properties of the hot strip influencing elements existing gas or plasma jet acts and by changing the acting kinetic energy of the gas or plasma jet, the gas partial pressure and / or the applied temperature, the concentration of the gas or plasma jet introduced into the melt and diffused there Elements about the tape thickness and bandwidth is set.
2. Verfahren nach Anspruch 1 2. The method according to claim 1
dadurch gekennzeichnet,  characterized,
dass dem Gas- oder Plasmastrahl Feststoffpartikel zugesetzt sind.  that solid particles are added to the gas or plasma jet.
3. Verfahren nach Anspruch 1 und 2 3. The method according to claim 1 and 2
dadurch gekennzeichnet,  characterized,
dass das für den Gasstrahl verwendete Gas inert und/oder reduzierend ist.  the gas used for the gas jet is inert and / or reducing.
4. Verfahren nach Anspruch 1 und 2 4. The method according to claim 1 and 2
dadurch gekennzeichnet,  characterized,
dass das für den Gasstrahl verwendete Gas ein Mischgas aus einem inerten Gas als Träger und einem reduzierenden Gas ist. the gas used for the gas jet is a mixed gas of an inert gas as a carrier and a reducing gas.
5. Verfahren nach einem der Ansprüche 1 bis 4 5. The method according to any one of claims 1 to 4
dadurch gekennzeichnet,  characterized,
dass das Gas kalt oder vorgewärmt ist.  that the gas is cold or preheated.
6. Verfahren nach einem der Ansprüche 1 bis 5 6. The method according to any one of claims 1 to 5
dadurch gekennzeichnet,  characterized,
dass die Werkstoffeigenschaften symmetrisch oder asymmetrisch über die Breite des Bandes eingestellt werden.  that the material properties are adjusted symmetrically or asymmetrically across the width of the strip.
7. Verfahren nach einem der Ansprüche 1 bis 6 7. The method according to any one of claims 1 to 6
dadurch gekennzeichnet,  characterized,
dass die Werkstoffeigenschaften zusätzlich über die gegossene Länge des Bandes variabel eingestellt werden.  that the material properties are additionally set variably over the cast length of the strip.
8. Verfahren nach einem der Ansprüche 1 bis 7 8. The method according to any one of claims 1 to 7
dadurch gekennzeichnet,  characterized,
dass durch gezielte Beaufschlagung der noch flüssigen Gießbandrandbereiche mit dem Gas- oder Plasmastrahl die Form der Gießbandkanten im Zuge der Erstarrung beeinflusst werden.  that the shape of the casting strip edges in the course of solidification can be influenced by targeted application of the still liquid casting belt edge regions with the gas or plasma jet.
EP10749463.5A 2009-08-21 2010-07-14 Method for producing a hot-rolled strip by means of strip casting, wherein the material properties can be adjusted over the strip cross-section Not-in-force EP2467221B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009038974A DE102009038974B3 (en) 2009-08-21 2009-08-21 Method for producing steel hot strip with material characteristics adjustable over the band cross-section, comprises applying a steel melt by a casting groove on a running casting band of a horizontal strip casting plant
PCT/DE2010/000826 WO2011020451A1 (en) 2009-08-21 2010-07-14 Method for producing a hot-rolled strip by means of strip casting, wherein the material properties can be adjusted over the strip cross-section

Publications (2)

Publication Number Publication Date
EP2467221A1 true EP2467221A1 (en) 2012-06-27
EP2467221B1 EP2467221B1 (en) 2016-01-27

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EP10749463.5A Not-in-force EP2467221B1 (en) 2009-08-21 2010-07-14 Method for producing a hot-rolled strip by means of strip casting, wherein the material properties can be adjusted over the strip cross-section

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Country Link
US (1) US10086426B2 (en)
EP (1) EP2467221B1 (en)
KR (1) KR20120051028A (en)
DE (1) DE102009038974B3 (en)
RU (1) RU2537580C2 (en)
WO (1) WO2011020451A1 (en)

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Also Published As

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US10086426B2 (en) 2018-10-02
RU2537580C2 (en) 2015-01-10
KR20120051028A (en) 2012-05-21
US20120279677A1 (en) 2012-11-08
WO2011020451A1 (en) 2011-02-24
EP2467221B1 (en) 2016-01-27
RU2012110590A (en) 2013-09-27
DE102009038974B3 (en) 2010-11-25

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