EP1341937A1 - Method for producing a hot rolled strip made of a steel comprising a high content of manganese - Google Patents

Method for producing a hot rolled strip made of a steel comprising a high content of manganese

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Publication number
EP1341937A1
EP1341937A1 EP01991793A EP01991793A EP1341937A1 EP 1341937 A1 EP1341937 A1 EP 1341937A1 EP 01991793 A EP01991793 A EP 01991793A EP 01991793 A EP01991793 A EP 01991793A EP 1341937 A1 EP1341937 A1 EP 1341937A1
Authority
EP
European Patent Office
Prior art keywords
strip
hot
hot strip
steel
rolling
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
EP01991793A
Other languages
German (de)
French (fr)
Other versions
EP1341937B1 (en
Inventor
Bernhard Dr.-Ing. Engl
Dieter Prof. Dr.-Ing. Senk
Johann Wilhelm Dr. Schmitz
Andreas Dipl.-Ing. Offergeld
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl AG
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Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Publication of EP1341937A1 publication Critical patent/EP1341937A1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip casting
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • 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 strip from a steel having a high manganese content of more than 12 to 30% by weight. Steels of this type are characterized by their particularly high strength.
  • a problem in the production and processing of steels which have such high manganese contents is that they have a solidification behavior which differs from the conventional steels intended for deep-drawing applications, such as IF or low-carbon steels. This shows that steels of the type in question which are cast in conventional slab casting have poor forming behavior.
  • steels which, in addition to other alloying elements, contain 7% to 27% Mn, can be produced by thin strip casting as a strip close to the end and processed into hot strip.
  • the material obtained in this way is particularly suitable for use in the field of automobile body construction.
  • the object of the invention is to provide a method which enables the production of steel strips enables that have a good forming behavior despite a high manganese content.
  • This object is achieved by a method for producing a hot strip having TWIN and TRIP properties from a steel containing more than 12 to 30% by weight of manganese, in which a melt in a two-roll casting machine is close to the final dimensions of a preliminary strip with a Thickness of up to 6 mm is cast, which is continuously processed into hot strip after the casting by rolling it to the final thickness of the hot strip in a single hot pass.
  • high manganese steel is cast into a raw material, the dimensions of which approximate the final dimensions of the hot strip.
  • a thin material is produced in the casting process that an essentially uniform solidification is ensured over its entire cross section.
  • the hot strip produced from the primary material has TRIP ("Transformation-Induced-Plasticity") and TWIP ("Twinning-Induced-Plasticity”) properties and accordingly has good formability, which it combines with the high strength in a special way suitable for use in body construction.
  • the thickness of the material produced should be as small as possible.
  • the solidification process can be specifically controlled in a simple manner in the case of a thin cast preliminary product.
  • the rate of solidification has a direct influence on the level and distribution of micro segregations. These in turn influence the grain growth and the state of the precipitates occurring during the solidification, such as MnS, A1N and Ti (C, N).
  • the fundamentals can be set which decisively influence the further processability and the properties of use of the end product.
  • the steel is cast according to the invention in a two-roll casting machine.
  • This type of casting machine which is known per se, makes it possible to produce particularly thin pre-material, which closely approximates the final dimension of the hot strip, and whose solidification behavior, in particular its solidification speed and uniformity, leads to an optimal casting structure and, consequently, to an optimized formability.
  • the further processing of the primary material into hot strip comprises a controlled cooling immediately following the casting. This enables the primary material emerging from the casting mold to be specifically cooled in such a way that a structure which is optimized for further processing is obtained. As a rule, cooling will take place at a higher cooling rate than cooling in air.
  • the mean initial rolling temperature at which the starting material enters the roll stand can be between 1100 ° C and 750 ° C.
  • the properties of the hot-rolled strip can also be influenced in a targeted manner by cooling the rolled hot strip in a controlled manner after the hot rolling.
  • process the hot strip obtained in accordance with the invention “inline”, for example into a cold strip. In many cases it will possibly be with regard to the following
  • Processing steps or properties of the hot strip to be set are expedient if the strip is coiled into a coil in the course of further processing.
  • the primary material By further processing the primary material into hot strip at least in sections under a protective gas atmosphere, oxidation of the strip surface and the associated excessive scale formation can be avoided.
  • the primary material is kept under the protective gas atmosphere at least up to its entry into the roll stand.
  • Steels used according to the invention can contain up to 3.5% by weight, in particular up to 3% by weight, of silicon in addition to further alloying elements. In addition, they can have up to 3.5% by weight, in particular up to 3% by weight, of aluminum. In steels of the type processed according to the invention, iron and aluminum or iron and silicon form intermetallic phases which occur below the thermoforming temperature and are stable up to room temperature.
  • FIG. 1 shows the structure of a device for producing a hot strip in a schematic side view, Diagram the temperature profile over the processing time of the pre-strip and hot strip in a device according to FIG. 1,
  • Image 1 an enlarged section through the
  • the figure shows schematically the structure of a device 1 for producing a hot strip W, which comprises a casting device 2, a first cooling section 3, a roll stand 4, a second cooling section 5 and a reel device 6.
  • a melt S contained in a tundish 7 of a composition explained below in detail is converted into a preliminary strip V in the casting gap 10 formed between two casting rolls 8, 9 cast.
  • the cast pre-strip V leaves the casting gap 10 in a continuous conveying process with a thickness that can be varied between less than 1 mm and 6 mm.
  • the sliver V On its way to the rolling stand 4, the sliver V is cooled in a controlled manner in the first cooling section 3 below the outlet of the casting gap 10 and closely adjacent to it, using a cooling medium applied to its surfaces.
  • the conveyor section covered by the thin strip V between the exit of the casting gap 10 and the roll stand 4 is surrounded by a housing 11 in which a protective gas atmosphere is maintained. In this way, contact of the belt surface with the oxygen in the ambient air is avoided.
  • the thin strip V runs into the rolling stand 4 with a rolling start temperature AT and is rolled in one pass to its final thickness.
  • the hot strip W is again brought to the reel temperature HT in a controlled manner with a suitable cooling medium, with which it is finally in the reel device
  • the attached diagram shows the roll starting temperature AT, the roll end temperature ET and the reel temperature HT over the processing time after casting in the range that can be set depending on the composition and the desired properties of the hot strip to be produced on a device constructed according to the figure , Appropriate temperature control along a predetermined limit curve with subsequent isothermal holding, rolling and quenching allows the fine-grained structure of the hot strip to freeze after it leaves the rolling stand, so that the good performance properties of the hot strip are retained after hot rolling. Especially when the temperature profile of the pre and hot strip approximates the lower limit curve shown in the diagram, this effect can be achieved.
  • the melt S cast in the exemplary embodiment had an Mn content of 20% by weight, a C content of 0.003% by weight, a sulfur content of 0.007% by weight and an Si content of 3%. 0% by weight, an Al content of 3.0% by weight and the balance iron.
  • Figure 1 shows an enlarged section through the edge area
  • Figure 2 shows an enlarged section in the same way through the central area of a hot strip produced from this steel in the device shown in the figure. It can be seen that the strip has a dendritic structure which consists of austenite and a presumably carbon-containing second phase. Towards the core of the tape there is a clear fine-tuning of the structure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

A steel strip can be produced which in spite of its high manganese content has good deformation behaviour in that, according to the invention, from a steel which comprises more than 12 to 30 weight % of manganese, a roughed strip (V) is cast close to the final dimensions in a double-roller casting machine ( 2 ), said roughed strip comprising a thickness of up to 6 mm. Following casting, this roughed strip is further processed to form a continuous hot strip by preferably being rolled in a single hot roll pass.

Description

Verfahren zum Erzeugen eines Warmbandes aus einem einen hohen Mangan-Gehalt aufweisenden Stahl Method for producing a hot strip from a steel with a high manganese content
Die Erfindung betrifft ein Verfahren zum Erzeugen eines Warmbandes aus einem einen hohen, mehr als 12 bis 30 Gew.-% betragenden Mangan-Gehalt aufweisenden Stahl. Stähle dieser Art zeichnen sich durch besonders hohe Festigkeit aus.The invention relates to a method for producing a hot strip from a steel having a high manganese content of more than 12 to 30% by weight. Steels of this type are characterized by their particularly high strength.
Ein Problem bei der Herstellung und Verarbeitung von Stählen, die derart hohe Mangan-Gehalte aufweisen, besteht darin, daß sie ein Erstarrungsverhalten aufweisen, welches sich von den üblichen, für Tiefziehanwendungen bestimmten Stählen, wie IF- oder Low- Carbon-Stählen, unterscheidet. So zeigt sich, daß im konventionellen Brammenstrangguß vergossene, hoch- manganhaltige Stähle der in Rede stehenden Art ein schlechtes Umformverhalten aufweisen.A problem in the production and processing of steels which have such high manganese contents is that they have a solidification behavior which differs from the conventional steels intended for deep-drawing applications, such as IF or low-carbon steels. This shows that steels of the type in question which are cast in conventional slab casting have poor forming behavior.
Gemäß einem aus der DE 199 00 199 AI bekannten Verfahren lassen sich Stähle, die neben anderen Legierungselementen 7 % bis 27 % Mn enthalten, durch Dünnbandgießen als endab essungsnahes Band erzeugen und zu Warmband verarbeiten. Das so erhaltene Material eignet sich in besonderer Weise für die Anwendung im Bereich des Automobil-Karosseriebaus .According to a method known from DE 199 00 199 AI, steels which, in addition to other alloying elements, contain 7% to 27% Mn, can be produced by thin strip casting as a strip close to the end and processed into hot strip. The material obtained in this way is particularly suitable for use in the field of automobile body construction.
Die Aufgabe der Erfindung besteht darin, ein Verfahren anzugeben, welches die Erzeugung von Stahlbändern ermöglicht, die trotz eines hohen Mangan-Gehaltes ein gutes ümformverhalten besitzen.The object of the invention is to provide a method which enables the production of steel strips enables that have a good forming behavior despite a high manganese content.
Diese Aufgabe wird durch ein Verfahren zum Erzeugen eines TWIN- und TRIP-Eigenschaften aufweisenden Warmbandes aus einem mehr als 12 bis 30 Gew.-% Mangan enthaltenden Stahl gelöst, bei dem eine Schmelze in einer Zwei-Rollen- Gießmaschine endabmessungsnah zu einem Vorband mit einer Dicke von bis zu 6 mm vergossen wird, welches im Anschluß an das Gießen kontinuierlich zu Warmband weiterverarbeitet wird, indem es in einem einzigen Warmwalzstich auf die Enddicke des Warmbands gewalzt wird.This object is achieved by a method for producing a hot strip having TWIN and TRIP properties from a steel containing more than 12 to 30% by weight of manganese, in which a melt in a two-roll casting machine is close to the final dimensions of a preliminary strip with a Thickness of up to 6 mm is cast, which is continuously processed into hot strip after the casting by rolling it to the final thickness of the hot strip in a single hot pass.
Gemäß der Erfindung wird hoch-manganhaltiger Stahl zu einem Vormaterial vergossen, dessen Abmessungen den Endabmessungen des Warmbandes angenähert sind. Auf diese Weise wird schon im Gießprozeß ein derart dünnes Material erzeugt, daß eine im wesentlichen gleichmäßige Erstarrung über seinen gesamten Querschnitt sichergestellt ist. Überraschend hat sich gezeigt, daß das derart endabmessungsnah vergossene Vormaterial ein wesentlich feinkörnigeres, gleichmäßigeres Gefüge aufweist als auf konventionellem Wege erzeugtes Stahlband mit einem vergleichbar hohen Mangan-Gehalt. Das aus dem Vormaterial erzeugte Warmband besitzt TRIP ("Transformation-Induced- Plasticity") - und TWIP ("Twinning-Induced-Plasticity") - Eigenschaften und weist dementsprechend eine gute Umformbarkeit auf, welche es in Kombination mit der hohen Festigkeit in besonderer Weise für die Verwendung im Karosseriebau geeignet macht. Erfindungsgemäß sollte die Dicke des erzeugten Materials möglichst gering sein. Je dünner das gegossene Vormaterial ist, desto feiner ist das Erstarrungsgefüge und desto weniger können erstarrungsbedingte Fehler die Weiterverarbeitung zu Warmband stören. Gleichzeitig läßt sich bei einem dünnen gegossenen Vorprodukt der Vorgang der Erstarrung auf einfache Weise gezielt steuern. So kann in einem kontrollierten Vorgang dem Umstand Rechnung getragen werden, daß insbesondere bei Stählen der hier in Rede stehenden Art die Erstarrungsgeschwindigkeit unmittelbaren Einfluß auf die Höhe und die Verteilung von Mikroseigerungen hat. Diese beeinflussen wiederum das Kornwachstum und den Zustand der im Zuge der Erstarrung auftretenden Ausscheidungen, wie MnS, A1N und Ti(C,N). Durch die gezielte Steuerung der Gefügeparameter des gegossenen Vormaterials können somit die Grundlagen eingestellt werden, welche die Weiterverarbeitbarkeit und die Gebrauchseigenschaften des Endprodukts entscheidend beeinflussen.According to the invention, high manganese steel is cast into a raw material, the dimensions of which approximate the final dimensions of the hot strip. In this way, such a thin material is produced in the casting process that an essentially uniform solidification is ensured over its entire cross section. Surprisingly, it has been shown that the raw material cast in this way close to the final dimensions has a much more fine-grained, more uniform structure than steel strip produced in a conventional manner with a comparatively high manganese content. The hot strip produced from the primary material has TRIP ("Transformation-Induced-Plasticity") and TWIP ("Twinning-Induced-Plasticity") properties and accordingly has good formability, which it combines with the high strength in a special way suitable for use in body construction. According to the invention, the thickness of the material produced should be as small as possible. The thinner the cast raw material, the finer the solidification structure and the less errors caused by solidification can interfere with the further processing into hot strip. At the same time, the solidification process can be specifically controlled in a simple manner in the case of a thin cast preliminary product. In a controlled process, the fact can be taken into account that, particularly in the case of steels of the type in question, the rate of solidification has a direct influence on the level and distribution of micro segregations. These in turn influence the grain growth and the state of the precipitates occurring during the solidification, such as MnS, A1N and Ti (C, N). Through the targeted control of the structural parameters of the cast primary material, the fundamentals can be set which decisively influence the further processability and the properties of use of the end product.
Das Vergießen des Stahles erfolgt erfindungsgemäß in einer Zwei-Rollen-Gießmaschine. Dieser an sich bekannte Gießmaschinentyp ermöglicht es, besonders dünnes, der endgültigen Abmessung des Warmbandes stark angenähertes Vormaterial zu erzeugen, dessen Erstarrungsverhalten, insbesondere seine Erstarrungsgeschwindigkeit und -gleichmäßigkeit zu einem optimalen Gußgefüge und damit einhergehend zu einer optimierten Umformbarkeit führt.The steel is cast according to the invention in a two-roll casting machine. This type of casting machine, which is known per se, makes it possible to produce particularly thin pre-material, which closely approximates the final dimension of the hot strip, and whose solidification behavior, in particular its solidification speed and uniformity, leads to an optimal casting structure and, consequently, to an optimized formability.
Überraschend hat sich gezeigt, daß sich dadurch, daß aus dem Vorband in nur einem einzigen Stich ein Warmband auf Enddicke gewalzt wird, besonders gute Arbeitsergebnisse erzielen lassen. Die unmittelbare, kontinuierliche Aufeinanderfolge von Gießprozeß und des in einem Stich erfolgenden Warmwalzens ermöglicht es, die Hitze des Gießprozesses in den Walzprozeß mitzunehmen, so daß der bei konventionellem Brammenguß stets erforderliche Schritt der Wiedererwärmung vor dem Warmwalzen vermieden werden kann. Die "Mitnahme" der Gießhitze vermeidet zudem ein übermäßiges Kristallwachstum und unterstützt so zusätzlich die Ausbildung eines feinen Gefüges im Vormaterial.Surprisingly, it has been shown that particularly good work results can be achieved by rolling a hot strip to final thickness from the preliminary strip in only one pass. The immediate, continuous Sequence of the casting process and the one-pass hot rolling makes it possible to take the heat of the casting process into the rolling process, so that the step of reheating before hot rolling, which is always necessary in conventional slab casting, can be avoided. The "entrainment" of the casting heat also prevents excessive crystal growth and thus additionally supports the formation of a fine structure in the primary material.
Wegen des besonderen Einflusses des Erstarrungsvorgangs auf die Eigenschaften des Endprodukts ist es vorteilhaft, wenn die Weiterverarbeitung des Vormaterials zu Warmband eine im unmittelbaren Anschluß an das Gießen erfolgende kontrollierte Abkühlung umfaßt. Dies ermöglicht es, das aus der Gießkokille austretende Vormaterial gezielt so abzukühlen, daß ein für die Weiterverarbeitung optimiertes Gefüge erhalten wird. Dabei wird die Abkühlung in der Regel mit einer gegenüber der Abkühlung an Luft höheren Abkühlgeschwindigkeit erfolgen.Because of the particular influence of the solidification process on the properties of the end product, it is advantageous if the further processing of the primary material into hot strip comprises a controlled cooling immediately following the casting. This enables the primary material emerging from the casting mold to be specifically cooled in such a way that a structure which is optimized for further processing is obtained. As a rule, cooling will take place at a higher cooling rate than cooling in air.
Versuche haben gezeigt, daß, in Abhängigkeit von der Zusammensetzung und den gewünschten Eigenschaften des Endproduktes, die mittlere Walzanfangstemperatur, mit der das Vormaterial in das Walzgerüst einläuft, zwischen 1100 °C und 750 °C liegen kann.Experiments have shown that, depending on the composition and the desired properties of the end product, the mean initial rolling temperature at which the starting material enters the roll stand can be between 1100 ° C and 750 ° C.
Sofern das Vormaterial warmgewalzt wird, können die Eigenschaften des warmgewalzten Bandes darüber hinaus dadurch gezielt beeinflußt werden, daß das gewalzte Warmband im Anschluß an das Warmwalzen kontrolliert abgekühlt wird. Grundsätzlich ist es denkbar, das erfindungsgemäß erhaltene Warmband "inline" beispielsweise zu einem Kaltband weiterzuverarbeiten. In vielen Fällen wird es im Hinblick auf möglicherweise folgendeIf the primary material is hot-rolled, the properties of the hot-rolled strip can also be influenced in a targeted manner by cooling the rolled hot strip in a controlled manner after the hot rolling. In principle, it is conceivable to process the hot strip obtained in accordance with the invention “inline”, for example into a cold strip. In many cases it will possibly be with regard to the following
Verarbeitungsschritte oder einzustellende Eigenschaften des Warmbandes jedoch zweckmäßig sein, wenn das Band im Zuge der Weiterverarbeitung zu einem Coil gehaspelt wird.Processing steps or properties of the hot strip to be set, however, are expedient if the strip is coiled into a coil in the course of further processing.
Indem die Weiterverarbeitung des Vormaterials zu Warmband mindestens abschnittsweise unter einer Schutzgasatmosphäre erfolgt, kann eine Oxidation der Bandoberfläche und damit einhergehend eine übermäßige Zunderbildung vermieden werden. In diesem Zusammenhang ist es besonders günstig, wenn das Vormaterial mindestens bis zu seinem Eintritt in das Walzgerüst unter der Schutzgasatmosphäre gehalten wird.By further processing the primary material into hot strip at least in sections under a protective gas atmosphere, oxidation of the strip surface and the associated excessive scale formation can be avoided. In this context, it is particularly advantageous if the primary material is kept under the protective gas atmosphere at least up to its entry into the roll stand.
Erfindungsgemäß zum Einsatz kommende Stähle können neben weiteren Legierungselementen bis zu 3,5 Gew.-%, insbesondere bis zu 3 Gew.-%, Silizium enthalten. Darüber hinaus können sie bis zu 3,5 Gew.-%, insbesondere bis zu 3 Gew.-%, Aluminium aufweisen. Eisen und Aluminium bzw. Eisen und Silizium bilden in Stählen der erfindungsgemäß verarbeiteten Art intermetallische Phasen, die unterhalb der Warmformungstemperatur auftreten und bis zur Raumtemperatur stabil sind.Steels used according to the invention can contain up to 3.5% by weight, in particular up to 3% by weight, of silicon in addition to further alloying elements. In addition, they can have up to 3.5% by weight, in particular up to 3% by weight, of aluminum. In steels of the type processed according to the invention, iron and aluminum or iron and silicon form intermetallic phases which occur below the thermoforming temperature and are stable up to room temperature.
Nachfolgend wird die Erfindung anhand eines Ausführungsbeispiels näher erläutert. Es zeigen:The invention is explained in more detail below using an exemplary embodiment. Show it:
Figur den Aufbau einer Vorrichtung zum Erzeugen eines Warmbandes in einer schematischen seitlichen Ansicht, Diagramm den Temperaturverlauf über die Verarbeitungszeit des Vor- und Warmbandes in einer Vorrichtung gemäß Fig. 1,FIG. 1 shows the structure of a device for producing a hot strip in a schematic side view, Diagram the temperature profile over the processing time of the pre-strip and hot strip in a device according to FIG. 1,
Bild 1 einen vergrößerten Schnitt durch denImage 1 an enlarged section through the
Kantenbereich des in der Vorrichtung gemäß Fig. 1 erzeugten Warmbandes,Edge area of the hot strip produced in the device according to FIG. 1,
Bild 2 einen vergrößerten Schnitt durch denImage 2 an enlarged section through the
Mittenbereich des in der Vorrichtung gemäß Fig. 1 erzeugten Warmbandes.Center region of the hot strip produced in the device according to FIG. 1.
Die Figur zeigt schematisch den Aufbau einer Vorrichtung 1 zum Erzeugen eines Warmbandes W, die eine Gießvorrichtung 2, eine erste Kühlstrecke 3, ein Walzgerüst 4, eine zweite Kühlstrecke 5 und eine Haspeleinrichtung 6 umfaßt.The figure shows schematically the structure of a device 1 for producing a hot strip W, which comprises a casting device 2, a first cooling section 3, a roll stand 4, a second cooling section 5 and a reel device 6.
In der nach dem bekannten Prinzip einer Zwei-Rollen- Gießmaschine ("Double Roller") aufgebauten Gießvorrichtung 2 wird eine in einem Tundish 7 enthaltene Schmelze S einer nachfolgend im einzelnen erläuterten Zusammensetzung in den zwischen zwei Gießrollen 8,9 gebildeten Gießspalt 10 zu Vorband V gegossen. Das gegossene Vorband V verläßt den Gießspalt 10 in einem kontinuierlichen Fördervorgang mit einer Dicke, die zwischen weniger als 1 mm und 6 mm variierbar ist.In the casting device 2 constructed according to the known principle of a two-roll casting machine (“double roller”), a melt S contained in a tundish 7 of a composition explained below in detail is converted into a preliminary strip V in the casting gap 10 formed between two casting rolls 8, 9 cast. The cast pre-strip V leaves the casting gap 10 in a continuous conveying process with a thickness that can be varied between less than 1 mm and 6 mm.
Das Vorband V wird auf seinem Weg zu dem Walzgerüst 4 in der unterhalb des Austritts des Gießspalts 10 und eng benachbart zu diesem angeordneten ersten Kühlstrecke 3 mit einem auf seine Oberflächen aufgebrachten Kühlmedium kontrolliert abgekühlt. Die zwischen dem Austritt des Gießspalts 10 und dem Walzgerüst 4 von dem Dünnband V zurückgelegte Förderstrecke ist von einer Einhausung 11 umgeben, in der eine Schutzgas-Atmosphäre aufrechterhalten wird. Auf diese Weise wird ein Kontakt der Bandoberfläche mit dem Sauerstoff der Umgebungsluft vermieden.On its way to the rolling stand 4, the sliver V is cooled in a controlled manner in the first cooling section 3 below the outlet of the casting gap 10 and closely adjacent to it, using a cooling medium applied to its surfaces. The conveyor section covered by the thin strip V between the exit of the casting gap 10 and the roll stand 4 is surrounded by a housing 11 in which a protective gas atmosphere is maintained. In this way, contact of the belt surface with the oxygen in the ambient air is avoided.
Das Dünnband V läuft in das Walzgerüst 4 mit einer Walzanfangstemperatur AT ein und wird darin in einem Stich auf seine Enddicke gewalzt.The thin strip V runs into the rolling stand 4 with a rolling start temperature AT and is rolled in one pass to its final thickness.
Das das Walzgerüst 4 mit einer Walzendtemperatur ET verlassende Warmband W durchläuft unmittelbar anschließend die zweite Kühlstrecke 5. In der KühlstreckeThe hot strip W leaving the roll stand 4 with a final roll temperature ET passes immediately afterwards through the second cooling section 5. In the cooling section
5 wird das Warmband W wiederum mit einem geeigneten Kühlmedium kontrolliert auf die Haspeltemperatur HT gebracht, mit der es schließlich in der Haspeleinrichtung5, the hot strip W is again brought to the reel temperature HT in a controlled manner with a suitable cooling medium, with which it is finally in the reel device
6 zu einem Coil C aufgewickelt wird.6 is wound into a coil C.
Im beigefügten Diagramm sind die Walzanfangstemperatur AT, die Walzendtemperatur ET und die Haspeltemperatur HT über die Verarbeitungszeit nach dem Gießen in der Bandbreite dargestellt, die sich in Abhängigkeit von der Zusammensetzung und den gewünschten Eigenschaften des zu erzeugenden Warmbandes auf einer gemäß der Figur aufgebauten Vorrichtung einstellen lassen. Durch eine geeignete Temperaturführung entlang einer vorgegebenen Grenzkurve mit anschließendem isothermen Halten, Walzen und Abschrecken läßt sich das feinkörnige Gefüge des Warmbandes nach dem Austritt aus dem Walzgerüst einfrieren, so daß die guten Gebrauchseigenschaften des Warmbandes nach dem Warmwalzen erhalten bleiben. Insbesondere dann, wenn der Temperaturverlauf des Vor- und Warmbandes der unteren im Diagramm dargestellten Grenzkurve angenähert ist, läßt sich dieser Effekt erreichen.The attached diagram shows the roll starting temperature AT, the roll end temperature ET and the reel temperature HT over the processing time after casting in the range that can be set depending on the composition and the desired properties of the hot strip to be produced on a device constructed according to the figure , Appropriate temperature control along a predetermined limit curve with subsequent isothermal holding, rolling and quenching allows the fine-grained structure of the hot strip to freeze after it leaves the rolling stand, so that the good performance properties of the hot strip are retained after hot rolling. Especially when the temperature profile of the pre and hot strip approximates the lower limit curve shown in the diagram, this effect can be achieved.
Die im Ausführungsbeispiel vergossene Schmelze S wies neben den üblichen unvermeidbaren Verunreinigungen einen Mn-Gehalt von 20 Gew.-%, einen C-Gehalt von 0,003 Gew.-%, einen Schwefelgehalt von 0,007 Gew.-%, einen Si-Gehalt von 3,0 Gew.-%, einen Al-Gehalt von 3,0 Gew.-% und als Rest Eisen auf.In addition to the usual unavoidable impurities, the melt S cast in the exemplary embodiment had an Mn content of 20% by weight, a C content of 0.003% by weight, a sulfur content of 0.007% by weight and an Si content of 3%. 0% by weight, an Al content of 3.0% by weight and the balance iron.
Bild 1 zeigt einen vergrößerten Schnitt durch den Kantenbereich und Bild 2 einen in gleicher Weise vergrößerten Schnitt durch den Mittenbereich eines aus diesem Stahl in der in der Figur dargestellten Vorrichtung erzeugten Warmbands. Es zeigt sich, daß das Band ein dendritisch ausgebildetes Gefüge aufweist, welches aus Austenit und einer vermutlich kohlenstoffhaltigen zweiten Phase besteht. Zum Kern des Bandes hin zeigt sich eine deutliche Feinung des Gefüges. Figure 1 shows an enlarged section through the edge area and Figure 2 shows an enlarged section in the same way through the central area of a hot strip produced from this steel in the device shown in the figure. It can be seen that the strip has a dendritic structure which consists of austenite and a presumably carbon-containing second phase. Towards the core of the tape there is a clear fine-tuning of the structure.
Bezugszeichenreference numeral
1 Vorrichtung1 device
2 Zwei-Rollen-Gießmaschine2 two-roll casting machine
3 erste Kühlstrecke3 first cooling section
4 Walzgerüst4 roll stand
5 zweite Kühlstrecke5 second cooling section
6 Haspeleinrichtung6 reel device
7 Tundish 8,9 Gießrollen7 tundish 8.9 casters
10 Gießspalt10 pouring gap
11 Einhausung11 enclosure
AT WalzanfangstemperaturAT initial roll temperature
C CoilC coil
ET WalzendtemperaturET final roll temperature
S SchmelzeS melt
V DünnbandV thin band
W Warmband W hot strip

Claims

PA T E N TAN S P RÜ C H E PA TEN TAN SP RUCHE
1. Verfahren zum Erzeugen eines TWIP- und TRIP- Eigenschaften aufweisenden Warmbandes (W) aus einem mehr als 12 bis 30 Gew.-% Mangan enthaltenden Stahl, bei dem eine Schmelze (S) in einer Zwei-Rollen- Gießmaschine (2) endabmessungsnah zu einem Vorband (V) mit einer Dicke von bis zu 6 mm vergossen wird, welches im Anschluß an das Gießen kontinuierlich zu Warmband (W) weiterverarbeitet wird, indem es in einem einzigen Warmwalzstich auf die Enddicke des Warmbands (W) gewalzt wird.1. A process for producing a TWIP and TRIP properties hot strip (W) from a steel containing more than 12 to 30% by weight of manganese, in which a melt (S) in a two-roll casting machine (2) is close to final dimensions is cast to a preliminary strip (V) with a thickness of up to 6 mm, which is continuously processed into hot strip (W) after the casting by rolling it to the final thickness of the hot strip (W) in a single hot rolling pass.
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, d a ß die Dicke des Vorbands bis zu 4 mm, insbesondere bis zu 2,5 mm, beträgt.2. The method of claim 1, d a d u r c h g e k e n n z e i c h n e t, that the thickness of the pre-strip is up to 4 mm, in particular up to 2.5 mm.
3. Verfahren nach einem der voranstehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, d a ß die Weiterverarbeitung des Vorbands zu Warmband eine im unmittelbaren Anschluß an das Gießen erfolgende kontrollierte Abkühlung umfaßt.3. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t, that the further processing of the pre-strip into hot strip comprises a controlled cooling immediately following the casting.
4. Verfahren nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t, d a ß die Abkühlung mit einer gegenüber der Abkühlung an Luft höheren Abkühlgeschwindigkeit erfolgt.4. The method according to claim 3, characterized in that ß the cooling takes place with a higher cooling rate than cooling in air.
5. Verfahren nach einem der voranstehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, d a ß die mittlere Walzanfangstemperatur (AT) , mit der das Vorband in das Walzgerüst (4) einläuft, zwischen 1100 °C und 750 °C liegt.5. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t, d a ß the mean rolling starting temperature (AT), with which the preliminary strip enters the roll stand (4), is between 1100 ° C and 750 ° C.
6. Verfahren nach einem der voranstehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, d a ß das gewalzte Warmband (W) im Anschluß an das Warmwalzen kontrolliert abgekühlt wird.6. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t, that the rolled hot strip (W) is cooled in a controlled manner after the hot rolling.
7. Verfahren nach einem der voranstehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, d a ß das Warmband (W) am Ende der Weiterverarbeitung zu einem Coil (C) gehaspelt wird.7. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t, that the hot strip (W) is reeled into a coil (C) at the end of the further processing.
8. Verfahren nach einem der voranstehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, d a ß die Weiterverarbeitung des Vorbands zu Warmband (W) mindestens abschnittsweise unter einer Schutzgasatmosphäre erfolgt. 8. The method according to any one of the preceding claims, characterized in that the further processing of the preliminary strip into hot strip (W) takes place at least in sections under a protective gas atmosphere.
9. Verfahren nach Anspruch 8, d a d u r c h g e k e n n z e i c h n e t, d a ß das Vorband (V) mindestens bis zu seinem Eintritt in das Walzgerüst9. The method of claim 8, d a d u r c h g e k e n n z e i c h n e t, d a ß the preliminary strip (V) at least until it enters the rolling stand
(4) unter der Schutzgasatmosphäre gehalten wird.(4) is kept under the protective gas atmosphere.
10. Verfahren nach einem der voranstehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, d a ß der Stahl bis zu 3,5 Gew.-%, insbesondere bis zu10. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t, d a ß the steel up to 3.5 wt .-%, in particular up to
3 Gew.-%, Silizium enthält.3 wt .-%, contains silicon.
11. Verfahren nach einem der voranstehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, d a ß der Stahl bis zu 3,5 Gew.-%, insbesondere bis zu11. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t, d a ß the steel up to 3.5 wt .-%, in particular up to
3 Gew.-% Aluminium, enthält. 3 wt .-% aluminum contains.
EP01991793A 2000-12-06 2001-12-06 Method for producing a hot rolled strip made of a steel comprising a high content of manganese Expired - Lifetime EP1341937B1 (en)

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DE10060948 2000-12-06
DE10060948A DE10060948C2 (en) 2000-12-06 2000-12-06 Process for producing a hot strip from a steel with a high manganese content
PCT/EP2001/014306 WO2002046480A1 (en) 2000-12-06 2001-12-06 Method for producing a hot rolled strip made of a steel comprising a high content of manganese

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EP1341937B1 EP1341937B1 (en) 2004-05-19

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WO2002046480A1 (en) 2002-06-13
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ES2221659T3 (en) 2005-01-01
PL362508A1 (en) 2004-11-02
PL196538B1 (en) 2008-01-31
CZ304928B6 (en) 2015-01-28
ATE267269T1 (en) 2004-06-15
CN1466633A (en) 2004-01-07
US20040074628A1 (en) 2004-04-22
EP1341937B1 (en) 2004-05-19
CN1236076C (en) 2006-01-11
DE10060948C2 (en) 2003-07-31
CZ20031558A3 (en) 2004-02-18
JP2004515362A (en) 2004-05-27
AU2002231664A1 (en) 2002-06-18
US20070199631A1 (en) 2007-08-30

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