EP1918402A1 - Process for manufacturing steel flat products from a steel forming a complex phase structure - Google Patents

Process for manufacturing steel flat products from a steel forming a complex phase structure Download PDF

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Publication number
EP1918402A1
EP1918402A1 EP06123134A EP06123134A EP1918402A1 EP 1918402 A1 EP1918402 A1 EP 1918402A1 EP 06123134 A EP06123134 A EP 06123134A EP 06123134 A EP06123134 A EP 06123134A EP 1918402 A1 EP1918402 A1 EP 1918402A1
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EP
European Patent Office
Prior art keywords
strip
hot
cold
thickness
rolled
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
EP06123134A
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German (de)
French (fr)
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EP1918402B1 (en
Inventor
Brigitte Dr.-Ing. Hammer
Thomas Dr.-Ing. Heller
Dr. Schmitz Johann Wilhelm
Jochen Dr. Wans
Andreas Nuss
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel AG
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Filing date
Publication date
Priority to EP06123134A priority Critical patent/EP1918402B1/en
Application filed by ThyssenKrupp Steel AG filed Critical ThyssenKrupp Steel AG
Priority to ES06123134T priority patent/ES2325960T3/en
Priority to DE502006003830T priority patent/DE502006003830D1/en
Priority to AT06123134T priority patent/ATE432372T1/en
Priority to PL06123134T priority patent/PL1918402T3/en
Priority to PCT/EP2007/061388 priority patent/WO2008052917A1/en
Priority to CN2007800400708A priority patent/CN101528969B/en
Priority to US12/447,626 priority patent/US20090277546A1/en
Priority to JP2009533820A priority patent/JP5232793B2/en
Priority to KR1020097007483A priority patent/KR101458039B1/en
Publication of EP1918402A1 publication Critical patent/EP1918402A1/en
Application granted granted Critical
Publication of EP1918402B1 publication Critical patent/EP1918402B1/en
Not-in-force legal-status Critical Current
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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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/041—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular fabrication or treatment of ingot or slab
    • C21D8/0415—Rapid solidification; Thin strip casting
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • 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
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the invention relates to a method for producing steel flat products, such as strips or sheet metal blanks, from high-strength complex phase steels.
  • CP steels belong to the group of multiphase steels. These are usually steels whose properties are determined by the type, amount and arrangement of the phases of the structure.
  • the structure therefore has at least two phases (eg ferrite, martensite, bainite). This gives them a strength / formability combination that is superior to conventional steels.
  • multiphase steels are of particular interest for the automotive industry because of their high strength, they permit the use of lower material thicknesses and concomitantly a reduction in vehicle weight and, secondly, the safety of the vehicle body in the event of a collision (crash behavior) .
  • multiphase steels with at least constant strength of the overall body allow a reduction in the sheet thickness of a component produced from such multiphase steels compared to a body produced from conventional steels.
  • multiphase steels are melted in the converter steelworks and on a continuous casting plant slabs or Cast thin slabs, which are then hot rolled into hot strip and reeled.
  • the mechanical properties of the hot strip can be varied.
  • the hot strips can be cold rolled to cold strip to provide thinner sheet thicknesses ( EP 0 910 675 B1 . EP 0 966 547 B1 . EP 1 169 486 B1 . EP 1 319 725 B1 . EP 1 398 390 A1 ).
  • This preparation route presents problems in particular when casting peritectically solidifying compositions.
  • These steel grades there is the danger of the formation of longitudinal cracks during continuous casting.
  • the formation of such longitudinal cracks can reduce the quality of the hot strips produced from the cast slabs or thin slabs so much that they become unusable.
  • extensive measures such as increased insulation costs, are required, which can go so far that the processing of such steel grades becomes uneconomical.
  • the cast strip is then hot rolled in-line in one or more passes of between 25% and 70% strain to a hot strip.
  • the final temperature of hot rolling is above the Ar 3 temperature.
  • the hot strip obtained is then cooled in two stages. In the first stage of this cooling, a cooling rate of 5 - 100 ° C / s is maintained until a temperature between 400 - 550 ° C is reached. At this temperature, the hot strip is allowed to sit for a pause time required to achieve bainitic transformation of the steel with a residual austenite content greater than 5% enable. The formation of perlite should be avoided.
  • the object of the invention was therefore to provide a method by means of which high-strength steel flat products can be produced over a wide range of geometric dimensions with reduced manufacturing outlay.
  • this object has been achieved by a method for producing steel flat products, according to the invention, a complex-phase structure forming steel, the (in wt .-%) 0, 08 - 0.11% C, 1.00-1.30% Mn, up to 0.030% P, up to 0.004% S, 0.60-0.80% Si, up to 0.05% Al, up to 0.0060% N, 0.30-0.80% Cr, 0.060-0.120% Ti and the remainder containing iron and unavoidable impurities to a cast strip a thickness of 1 to 4 mm, in which the cast strip in a continuous operation with a degree of deformation of more than 20% in-line at a lying in the range of 900 - 1100 ° C hot rolling end temperature to a hot strip with a thickness of 0 , 5 - 3.2 mm, and in which the hot strip is rewound at a coiler temperature of 550 - 620 ° C to obtain a hot strip whose tensile strength R
  • the invention uses the possibility of strip casting to process a high-strength, peritectically solidifying complex phase steel into a hot strip. Since the cast strip itself already has a small thickness, in the course of hot rolling of this strip only relatively low degrees of deformation must be maintained in order to produce flat products with small thicknesses, as are needed in particular in the automotive industry. Thus, by specifying a corresponding initial thickness of the cast strip, it is easily possible to produce hot strips using the method according to the invention, which have a maximum thickness of 1.5 mm with an optimum distribution of properties and from which, for example, elements for the support structure of an automobile can be produced.
  • the invention makes it possible to manufacture high-strength hot strips consisting of a complex phase steel of the specified composition processed according to the invention, whose width is more than 1,200 mm, in particular more than 1,600 mm.
  • the use according to the invention of the strip casting method in the processing of high-strength steels of the type assembled according to the invention offers, in addition to the above-mentioned advantages, due to its process-specific properties and manipulated variables (eg hot rolling end temperature, cooling, coiling temperature) the possibility of also critical steel compositions according to the invention with respect to their solidification behavior to safely shed processed species.
  • process-specific properties and manipulated variables eg hot rolling end temperature, cooling, coiling temperature
  • critical steel compositions according to the invention with respect to their solidification behavior to safely shed processed species.
  • the very rapid solidification of the cast strip which is characteristic of strip casting, leads to a significantly reduced risk of the formation of center segregations compared with conventional production, with the result that the hot strip produced according to the invention has a particularly uniform distribution of properties and microstructure over its cross section and its length.
  • the hot strip produced according to the invention has high strengths of at least 800 MPa, without having to observe a special cooling cycle of the hot strip between the end of the hot rolling and the coiling, as described for example in US Pat EP 1 072 689 B1 is prescribed by the need for a cooling break.
  • the method according to the invention merely has to ensure that the hot rolling ends in a relatively narrow temperature window and that the reeling is also carried out in a precisely defined temperature range. In between there is a one-stage cooling down.
  • a further advantage of the procedure according to the invention is that an extension of the range of mechanical properties of the strip produced according to the invention based on only one steel analysis can be achieved by varying the cooling and rolling conditions.
  • Hot strips produced according to the invention are particularly suitable for further processing into cold rolled strip. Accordingly, a practice-oriented embodiment of the invention provides that the hot strip is cold rolled to a cold strip having a thickness of 0.5-1.4 mm, in particular 0.7 mm to 1.3 mm, as is required for the construction of automobile bodies.
  • the cold strip can be annealed at an annealing temperature of 750-850 ° C.
  • tensile strengths of at least 800 MPa can be reliably ensured.
  • the breaking elongation A 50 of the cold strip is just as safe at least 10%.
  • the cold strip is provided in a conventional manner with a metallic coating, which may be, for example, a galvanizing.
  • the hot strip produced from the steel B was cold rolled after the coiling and pickling to a 0.7 mm thick cold strip and annealed at an annealing temperature of 800 ° C in the flow to recrystallize the strip.
  • the tensile strength R m of the cold strip thus obtained was 838 MPa.

Abstract

The method for the production of flat steel products useful in automotive industry, comprises casting a steel into a cast strip having a thickness of 1-4 mm, hot-rolling the cast strip in-line into a hot-rolled strip having a thickness of higher than 1.5 mm in a continuous process at 900-1100[deg] C, and coiling the hot-rolled strip at 550-620[deg] C to obtain a hot-rolled strip, which has a minimum tensile strength R m of 800 MPa and a minimum breaking elongation A 8 0 of 10%. The hot-rolled strip is cold-rolled with a thickness of 0.5-1.4 mm at 750-850[deg] C to obtain a cold-rolled strip. The method for the production of flat steel products useful in automotive industry, comprises casting a steel into a cast strip having a thickness of 1-4 mm, hot-rolling the cast strip in-line into a hot-rolled strip having a thickness of higher than 1.5 mm in a continuous process at 900-1100[deg] C, and coiling the hot-rolled strip at 550-620[deg] C to obtain a hot-rolled strip, which has a minimum tensile strength R m of 800 MPa and a minimum breaking elongation A 8 0 of 10%. The steel forms a complex phase structure. The shaping degree is greater than 20%. The width of the hot-rolled strip is more than 1.600 mm. The hot-rolled strip is cold-rolled with a thickness of 0.5-1.4 mm at 750-850[deg] C to obtain a cold-rolled strip, which has a minimum tensile strength of 800 MPa and a minimum breaking elongation A 8 0 of 10%. The cold- or hot-rolled strip is provided with a metallic coating, which is galvanizing.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Stahl-Flachprodukten, wie Bändern oder Blechzuschnitten, aus hochfesten Komplexphasenstählen. Derartige CP-Stähle gehören zur Gruppe der Mehrphasenstähle. Bei diesen handelt es sich üblicherweise um Stähle, deren Eigenschaften durch Art, Menge und Anordnung der Phasen des Gefüges bestimmt werden. Im Gefüge liegen daher mindestens zwei Phasen vor (z. B. Ferrit, Martensit, Bainit). Dadurch haben sie eine gegenüber konventionellen Stählen überlegene Festigkeits-/Umformbarkeitskombination.The invention relates to a method for producing steel flat products, such as strips or sheet metal blanks, from high-strength complex phase steels. Such CP steels belong to the group of multiphase steels. These are usually steels whose properties are determined by the type, amount and arrangement of the phases of the structure. The structure therefore has at least two phases (eg ferrite, martensite, bainite). This gives them a strength / formability combination that is superior to conventional steels.

Aufgrund dieser Besonderheiten sind Mehrphasenstähle insbesondere für den Automobilbau von großem Interesse, da sie aufgrund ihrer hohen Festigkeit zum einen die Verwendung geringerer Materialstärken und damit einhergehend eine Reduzierung des Fahrzeuggewichts erlauben und zum anderen die Sicherheit der Fahrzeugkarosserie im Fall eines Zusammenstoßes (Crash-Verhalten) verbessern. So ermöglichen Mehrphasenstähle bei mindestens gleich bleibender Festigkeit der Gesamtkarosse eine Reduzierung der Blechdicke eines aus solchen Mehrphasenstählen hergestellten Bauteils gegenüber einer aus konventionellen Stählen hergestellten Karosserie.Because of these peculiarities, multiphase steels are of particular interest for the automotive industry because of their high strength, they permit the use of lower material thicknesses and concomitantly a reduction in vehicle weight and, secondly, the safety of the vehicle body in the event of a collision (crash behavior) , Thus, multiphase steels with at least constant strength of the overall body allow a reduction in the sheet thickness of a component produced from such multiphase steels compared to a body produced from conventional steels.

Üblicherweise werden Mehrphasenstähle im Konverterstahlwerk erschmolzen und auf einer Stranggießanlage zu Brammen oder Dünnbrammen vergossen, die dann zu Warmband warmgewalzt und gehaspelt werden. Durch eine gezielt gesteuerte Abkühlung des Warmbands nach dem Warmwalzen mit dem Ziel einer Einstellung bestimmter Gefügeanteile können dabei die mechanischen Eigenschaften des Warmbandes variiert werden. Die Warmbänder können darüber hinaus zu Kaltband kaltgewalzt werden, um auch dünnere Blechdicken zur Verfügung zu stellen ( EP 0 910 675 B1 , EP 0 966 547 B1 , EP 1 169 486 B1 , EP 1 319 725 B1 , EP 1 398 390 A1 ).Usually, multiphase steels are melted in the converter steelworks and on a continuous casting plant slabs or Cast thin slabs, which are then hot rolled into hot strip and reeled. By a controlled controlled cooling of the hot strip after hot rolling with the aim of adjusting certain microstructures, the mechanical properties of the hot strip can be varied. In addition, the hot strips can be cold rolled to cold strip to provide thinner sheet thicknesses ( EP 0 910 675 B1 . EP 0 966 547 B1 . EP 1 169 486 B1 . EP 1 319 725 B1 . EP 1 398 390 A1 ).

Probleme bereitet diese Herstellungsroute insbesondere beim Vergießen von peritektisch erstarrenden Zusammensetzungen. Bei diesen Stahlgüten besteht die Gefahr der Bildung von Längsrissen beim Stranggießen. Die Entstehung von derartigen Längsrissen kann die Qualität der aus den gegossenen Brammen bzw. Dünnbrammen erzeugten Warmbänder so stark herabsetzen, dass sie unbrauchbar werden. Um dieser Gefahr vorzubeugen, sind umfangreiche Maßnahmen, wie ein erhöhter Flämmaufwand, erforderlich, der so weit gehen kann, dass die Verarbeitung derartiger Stahlgüten unwirtschaftlich wird. Beim Vergießen von Stählen mit hohen Al-Gehalten kommt es darüber hinaus zu unerwünschten Wechselwirkungen mit dem Gießpulver, durch die die Qualität eines aus diesen Stählen gefertigten Flachprodukts ebenfalls negativ beeinflusst wird.This preparation route presents problems in particular when casting peritectically solidifying compositions. With these steel grades there is the danger of the formation of longitudinal cracks during continuous casting. The formation of such longitudinal cracks can reduce the quality of the hot strips produced from the cast slabs or thin slabs so much that they become unusable. In order to prevent this danger, extensive measures, such as increased insulation costs, are required, which can go so far that the processing of such steel grades becomes uneconomical. When casting steels with high Al contents, there are also undesirable interactions with the casting powder, which also adversely affect the quality of a flat product made from these steels.

Ein weiteres Problem bei der Fertigung von Flachprodukten aus hochfesten Mehrphasenstählen besteht darin, dass beim Walzen derartiger Stähle hohe Walzkräfte aufgebracht werden müssen. Diese Anforderung hat zur Folge, dass in der Regel mit den derzeit üblicherweise zur Verfügung stehenden Fertigungsanlagen hochfeste Warmbänder aus Stählen der in Rede stehenden Art vielfach nur in einer Breite und Dicke zur Verfügung gestellt werden können, die den heute im Bereich des Automobilbaus gestellten Anforderungen nicht mehr in vollem Umfang gerecht werden. Es besteht zusätzlicher Bedarf an Bändern geringer Dicke bei ausreichenden Breiten. Auch erweist es sich bei konventioneller Vorgehensweise in der Praxis als schwierig, aus Mehrphasenstählen Kaltbänder mit Festigkeiten von mehr als 800 MPa herzustellen.Another problem in the production of flat products made of high-strength multiphase steels is that high rolling forces must be applied when rolling such steels. As a result of this requirement, high-strength hot strips of steels of the type in question are generally only available in width and thickness with the currently customarily available production facilities can not be made available in their entirety to meet the requirements of today's automotive industry. There is an additional need for narrow thickness ribbons with sufficient widths. It also turns out in conventional practice in practice difficult to produce multiphase steels cold strips with strengths of more than 800 MPa.

Ein alternativer Weg der Herstellung von Stahlbändern aus einem Mehrphasenstahl ist in der EP 1 072 689 B1 ( DE 600 09 611 T2 ) vorgeschlagen worden. Gemäß diesem bekannten Verfahren wird zur Herstellung von dünnen Stahlbändern zunächst eine Stahlschmelze, die (in Gew.-%) 0,05 und 0,25 % C, in Summe 0,5 - 3 % Mn, Cu und Ni, in Summe 0,1 - 4 % Si und Al, in Summe bis zu 0,1 % P, Sn, As und Sb, in Summe weniger als 0,3 % Ti, Nb, V, Zr und REM sowie jeweils weniger als 1 % Cr, Mo und V, Rest Eisen und unvermeidbare Verunreinigungen enthält, zu einem gegossenen Band mit einer Dicke von 0,5 - 10 mm, insbesondere 1 - 5 mm, vergossen. Das gegossene Band wird anschließend in-Line in ein oder mehreren Stichen mit einem zwischen 25 % und 70 % liegenden Umformgrad zu einem Warmband warmgewalzt. Die Endtemperatur des Warmwalzens liegt dabei oberhalb der Ar3-Temperatur. Nach dem Ende des Warmwalzens wird das erhaltene Warmband dann zweistufig abgekühlt. In der ersten Stufe dieser Abkühlung wird eine Abkühlgeschwindigkeit von 5 - 100 °C/s eingehalten, bis eine zwischen 400 - 550 °C liegende Temperatur erreicht ist. Bei dieser Temperatur lässt man dann das Warmband für eine Pausenzeit verweilen, die benötigt wird, um eine bainitische Umwandlung des Stahls mit einem Restaustenitanteil von mehr als 5 % zu ermöglichen. Die Bildung von Perlit soll dabei vermieden werden. Nach einer für die Einstellung der geforderten Gefügestruktur ausreichenden Pausenzeit wird der Umwandlungsvorgang durch den Beginn der zweiten Stufe der Abkühlung abgebrochen, bei der das Warmband auf eine Temperatur unter 400 °C gebracht wird, um es anschließend bei einer unter 350 °C liegenden Haspeltemperatur zu einem Coil zu wickeln.An alternative way of producing steel strip from a multiphase steel is in the EP 1 072 689 B1 ( DE 600 09 611 T2 ) has been proposed. According to this known method, for the production of thin steel strips, first of all a molten steel containing (in% by weight) 0.05 and 0.25% C, in total 0.5-3% Mn, Cu and Ni, in total 0, 1 to 4% Si and Al, in total up to 0.1% P, Sn, As and Sb, in total less than 0.3% Ti, Nb, V, Zr and REM and in each case less than 1% Cr, Mo and V, balance iron and unavoidable impurities, cast into a cast strip having a thickness of 0.5 - 10 mm, especially 1 - 5 mm. The cast strip is then hot rolled in-line in one or more passes of between 25% and 70% strain to a hot strip. The final temperature of hot rolling is above the Ar 3 temperature. After the end of the hot rolling, the hot strip obtained is then cooled in two stages. In the first stage of this cooling, a cooling rate of 5 - 100 ° C / s is maintained until a temperature between 400 - 550 ° C is reached. At this temperature, the hot strip is allowed to sit for a pause time required to achieve bainitic transformation of the steel with a residual austenite content greater than 5% enable. The formation of perlite should be avoided. After a sufficient for the adjustment of the required microstructure pause time of the conversion process is stopped by the beginning of the second stage of cooling, in which the hot strip is brought to a temperature below 400 ° C, then at a lying below 350 ° C reel temperature to a Wind coil.

Mit der in der EP 1 072 689 B1 beschriebenen Vorgehensweise soll eine einfache Herstellung von Warmband mit bainitischen Gefügeanteilen aus einem Mehrphasenstahl möglich sein, das TRIP-Eigenschaften ("TRIP" = "Transformation Induced Plasticity") aufweist. Derartige Stähle weisen relativ hohe Festigkeiten bei guter Verformbarkeit auf. Allerdings reichen die Festigkeiten für viele Anwendungsfälle insbesondere im Bereich des Automobilbaus nicht aus.With the in the EP 1 072 689 B1 described procedure is a simple production of hot strip with bainitic microstructural parts of a multi-phase steel is possible, the TRIP properties ("TRIP =" T ransformation I nduced P lasticity ") has. Such steels have relatively high strengths with good ductility. However, the strength is not sufficient for many applications, especially in the field of automotive engineering.

Die Aufgabe der Erfindung bestand daher darin, ein Verfahren zur Verfügung zu stellen, mit dem sich hochfeste Stahl-Flachprodukte über eine große Bandbreite von geometrischen Abmessungen bei vermindertem Herstellaufwand erzeugen lassen.The object of the invention was therefore to provide a method by means of which high-strength steel flat products can be produced over a wide range of geometric dimensions with reduced manufacturing outlay.

Ausgehend von dem voranstehend erläuterten Stand der Technik ist diese Aufgabe durch ein Verfahren zum Herstellen von Stahl-Flachprodukten gelöst worden, bei dem erfindungsgemäß ein ein Komplexphasen-Gefüge bildender Stahl, der (in Gew.-%) 0, 08 - 0,11 % C, 1,00 - 1,30 % Mn, bis zu 0,030 % P, bis zu 0,004 % S, 0,60 - 0,80 % Si, bis zu 0,05 % Al, bis zu 0,0060 % N, 0,30 - 0,80 % Cr, 0,060 - 0,120 % Ti und als Rest Eisen und unvermeidbare Verunreinigungen enthält, zu einem gegossenen Band mit einer Dicke von 1 - 4 mm vergossen wird, bei dem das gegossene Band in einem kontinuierlichen Arbeitsablauf mit einem Umformgrad von mehr als 20 % in-Line bei einer im Bereich von 900 - 1100 °C liegenden Warmwalzendtemperatur zu einem Warmband mit einer Dicke von 0,5 - 3,2 mm warmgewalzt wird und bei dem das Warmband bei einer 550 - 620 °C betragenden Haspeltemperatur gehaspelt wird, so dass ein Warmband erhalten wird, dessen Zugfestigkeit Rm mindestens 800 MPa bei einer Bruchdehnung A80 von mindestens 10 % beträgt.Based on the above-described prior art, this object has been achieved by a method for producing steel flat products, according to the invention, a complex-phase structure forming steel, the (in wt .-%) 0, 08 - 0.11% C, 1.00-1.30% Mn, up to 0.030% P, up to 0.004% S, 0.60-0.80% Si, up to 0.05% Al, up to 0.0060% N, 0.30-0.80% Cr, 0.060-0.120% Ti and the remainder containing iron and unavoidable impurities to a cast strip a thickness of 1 to 4 mm, in which the cast strip in a continuous operation with a degree of deformation of more than 20% in-line at a lying in the range of 900 - 1100 ° C hot rolling end temperature to a hot strip with a thickness of 0 , 5 - 3.2 mm, and in which the hot strip is rewound at a coiler temperature of 550 - 620 ° C to obtain a hot strip whose tensile strength R m is at least 800 MPa with an elongation at break A 80 of at least 10% ,

Die Erfindung nutzt die Möglichkeit des Bandgießens dazu, einen hochfesten, peritektisch erstarrenden Komplexphasenstahl zu einem Warmband zu verarbeiten. Da das gegossene Band dabei selbst schon eine geringe Dicke besitzt, müssen im Zuge des Warmwalzens dieses Bandes nur relativ geringe Umformgrade eingehalten werden, um Flachprodukte mit geringen Dicken zu erzeugen, wie sie insbesondere im Bereich der Automobilindustrie benötigt werden. So ist es durch Vorgabe einer entsprechenden Ausgangsdicke des gegossenen Bandes problemlos möglich, mit dem erfindungsgemäßen Verfahren Warmbänder herzustellen, die bei einer optimalen Eigenschaftsverteilung eine maximale Dicke von 1,5 mm aufweisen und aus denen sich beispielsweise Elemente für die Tragstruktur eines Automobils fertigen lassen.The invention uses the possibility of strip casting to process a high-strength, peritectically solidifying complex phase steel into a hot strip. Since the cast strip itself already has a small thickness, in the course of hot rolling of this strip only relatively low degrees of deformation must be maintained in order to produce flat products with small thicknesses, as are needed in particular in the automotive industry. Thus, by specifying a corresponding initial thickness of the cast strip, it is easily possible to produce hot strips using the method according to the invention, which have a maximum thickness of 1.5 mm with an optimum distribution of properties and from which, for example, elements for the support structure of an automobile can be produced.

Aufgrund der geringen Umformgrade während des Warmwalzens sind die dazu erforderlichen Walzkräfte verglichen mit den beim Warmwalzen von Brammen oder Dünnbrammen bei der konventionellen Vorgehensweise erforderlichen Kräften gering, so dass mit dem erfindungsgemäßen Verfahren problemlos Warmbänder von großer Breite erzeugt werden können, die deutlich über der Breite von in konventioneller Weise erzeugbaren Warmbändern derselben Festigkeits- und Dickenklasse liegen. So erlaubt es die Erfindung, hochfeste, aus einem Komplexphasenstahl der angegebenen erfindungsgemäß verarbeiteten Zusammensetzung bestehende Warmbänder sicher zu fertigen, deren Breite mehr als 1.200 mm, insbesondere mehr als 1.600 mm beträgt.Due to the low degrees of deformation during hot rolling, the rolling forces required for this are low compared with the forces required in the hot rolling of slabs or thin slabs in the conventional procedure, so that hot strips of large width are easily produced by the method according to the invention which are well above the width of conventionally producible hot strips of the same strength and thickness class. Thus, the invention makes it possible to manufacture high-strength hot strips consisting of a complex phase steel of the specified composition processed according to the invention, whose width is more than 1,200 mm, in particular more than 1,600 mm.

Die erfindungsgemäße Anwendung des Bandgießverfahrens bei der Verarbeitung von hochfesten Stählen der erfindungsgemäß zusammengesetzten Art bietet neben den voranstehend genannten Vorteilen auf Grund seiner verfahrensspezifischen Eigenschaften und Stellgrößen (z. B. Warmwalzendtemperatur, Abkühlung, Haspeltemperatur) die Möglichkeit, auch hinsichtlich ihres Erstarrungsverhalten kritische Stahlzusammensetzungen der erfindungsgemäß verarbeiteten Art sicher zu vergießen. So führt die für das Bandgießen charakteristische sehr rasche Erstarrung des gegossenen Bandes zu gegenüber einer konventionellen Fertigung deutlich verminderten Gefahr der Entstehung von Mittenseigerungen mit der Folge, dass das erfindungsgemäß erzeugte Warmband über seinen Querschnitt und seine Länge eine besonders gleichmäßige Eigenschaftsverteilung und Gefügestruktur aufweist.The use according to the invention of the strip casting method in the processing of high-strength steels of the type assembled according to the invention offers, in addition to the above-mentioned advantages, due to its process-specific properties and manipulated variables (eg hot rolling end temperature, cooling, coiling temperature) the possibility of also critical steel compositions according to the invention with respect to their solidification behavior to safely shed processed species. Thus, the very rapid solidification of the cast strip, which is characteristic of strip casting, leads to a significantly reduced risk of the formation of center segregations compared with conventional production, with the result that the hot strip produced according to the invention has a particularly uniform distribution of properties and microstructure over its cross section and its length.

Ein weiterer besonderer Vorteil der erfindungsgemäßen Vorgehensweise besteht darin, dass erfindungsgemäß erzeugtes Warmband hohe Festigkeiten von mindestens 800 MPa aufweist, ohne dass dazu ein besonderer Abkühlzyklus des Warmbands zwischen dem Ende des Warmwalzens und des Haspelns eingehalten werden muss, wie dies beispielsweise in der EP 1 072 689 B1 durch die Notwendigkeit einer Kühlpause vorgeschrieben ist. Bei der Durchführung des erfindungsgemäßen Verfahrens muss lediglich sichergestellt sein, dass das Warmwalzen in einem relativ eng umgrenzten Temperaturfenster beendet und auch das Haspeln in einem exakt definierten Temperaturbereich durchgeführt wird. Dazwischen findet eine einstufige Abkühlung statt.Another particular advantage of the procedure according to the invention is that the hot strip produced according to the invention has high strengths of at least 800 MPa, without having to observe a special cooling cycle of the hot strip between the end of the hot rolling and the coiling, as described for example in US Pat EP 1 072 689 B1 is prescribed by the need for a cooling break. In carrying out the The method according to the invention merely has to ensure that the hot rolling ends in a relatively narrow temperature window and that the reeling is also carried out in a precisely defined temperature range. In between there is a one-stage cooling down.

Ein weiterer Vorteil der erfindungsgemäßen Vorgehensweise besteht darin, dass eine Erweiterung der Spannbreite der mechanischen Eigenschaften des erfindungsgemäß erzeugten Bandes basierend auf nur einer Stahlanalyse durch eine Variation der Abkühl- und Walzbedingungen erreicht werden kann.A further advantage of the procedure according to the invention is that an extension of the range of mechanical properties of the strip produced according to the invention based on only one steel analysis can be achieved by varying the cooling and rolling conditions.

Erfindungsgemäß erzeugte Warmbänder eignen sich besonders zur Weiterverarbeitung zu kaltgewalztem Band. Dementsprechend sieht eine praxisgerechte Ausgestaltung der Erfindung vor, dass das Warmband zu einem Kaltband mit einer Dicke von 0,5 - 1,4 mm, insbesondere 0,7 mm bis 1,3 mm kaltgewalzt wird, wie es zum Bau von Automobilkarosserien benötigt wird. Um während des Kaltwalzens entstehende Verfestigungen zu beseitigen, kann das Kaltband bei einer Glühtemperatur von 750 - 850 °C geglüht werden. Für auf diese Weise aus dem erfindungsgemäß hergestellten Warmband erzeugtes Kaltband können Zugfestigkeiten von mindestens 800 MPa sicher gewährleistet werden. Die Bruchdehnung A50 des Kaltbands beträgt dabei ebenso sicher mindestens 10 %.Hot strips produced according to the invention are particularly suitable for further processing into cold rolled strip. Accordingly, a practice-oriented embodiment of the invention provides that the hot strip is cold rolled to a cold strip having a thickness of 0.5-1.4 mm, in particular 0.7 mm to 1.3 mm, as is required for the construction of automobile bodies. In order to eliminate solidification during cold rolling, the cold strip can be annealed at an annealing temperature of 750-850 ° C. For cold rolled strip produced in this way from the hot strip produced according to the invention, tensile strengths of at least 800 MPa can be reliably ensured. The breaking elongation A 50 of the cold strip is just as safe at least 10%.

Gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung wird das Kaltband in an sich bekannter Weise mit einer metallischen Beschichtung versehen, bei der es sich beispielsweise um eine Verzinkung handeln kann.According to a further advantageous embodiment of the invention, the cold strip is provided in a conventional manner with a metallic coating, which may be, for example, a galvanizing.

Nachfolgend wird die Erfindung anhand von Ausführungsbeispielen näher erläutert.The invention will be explained in more detail by means of exemplary embodiments.

In zum Nachweis der Wirkung der Erfindung durchgeführten Versuchen sind zwei erfindungsgemäß zusammengesetzte Stähle A und B mit der in Tabelle 1 angegebenen Zusammensetzung erschmolzen und in einer Zweiwalzengieß-Maschine jeweils zu gegossenem Band vergossen worden, das 1,6 mm dick war. Tabelle 1 (Angaben in Gew.-%) C Mn P S Si Al N Cr Ti A 0,09 1,17 0,005 0,003 0,71 0,019 0,0043 0, 68 0,065 B 0,09 1,16 0,006 0,003 0,71 0,017 0,0047 0, 68 0,089 In tests carried out to demonstrate the effect of the invention, two steels A and B composed according to the present invention having the composition shown in Table 1 were melted and cast in a two-roll casting machine each into cast strip 1.6 mm thick. Table 1 (in% by weight) C Mn P S Si al N Cr Ti A 0.09 1.17 0.005 0,003 0.71 0.019 0.0043 0, 68 0,065 B 0.09 1.16 0,006 0,003 0.71 0,017 0.0047 0, 68 0,089

Die aus den Stählen A und B gegossenen Bänder sind im unmittelbaren Anschluss an das Bandgießen in-Line bei einer Warmwalzendtemperatur WET zu einem Warmband warmgewalzt worden, dessen Dicke 1,25 mm betrug. Anschließend ist das jeweils erhaltene Warmband direkt in einem Kühlschritt auf eine Haspeltemperatur HT abgekühlt und gehaspelt worden. Nach dem Haspeln wiesen die aus den Stählen A und B erzeugten Warmbänder jeweils eine Zugfestigkeit Rm und eine Bruchdehnung A80 auf, die wie die bei ihrer Herstellung jeweils eingehaltene Warmwalzendtemperatur WET und Haspeltemperatur HT in Tabelle 2 angegeben sind. Tabelle 2 Stahl WET [°C] HT [°C] Rm [MPa] A80 [%] A 1000 580 836 11,0 B 1030 615 813 11,7 The tapes cast from steels A and B were hot rolled immediately after tape casting in-line at a hot rolling end temperature WET to a hot strip whose thickness was 1.25 mm. Subsequently, each hot strip obtained has been cooled directly in a cooling step to a coiler temperature HT and coiled. After coiling, the hot strips produced from steels A and B each had a tensile strength R m and an elongation at break A 80 , which, like the hot rolling end temperature WET and reel temperature HT, respectively, maintained in their preparation, are given in Table 2. Table 2 stole WET [° C] HT [° C] R m [MPa] A 80 [%] A 1000 580 836 11.0 B 1030 615 813 11.7

Das aus dem Stahl B erzeugte Warmband ist nach dem Haspeln und Beizen zu einem 0,7 mm dicken Kaltband kaltgewalzt und bei einer Glühtemperatur von 800 °C im Durchlauf geglüht worden, um das Band zu rekristallisieren.The hot strip produced from the steel B was cold rolled after the coiling and pickling to a 0.7 mm thick cold strip and annealed at an annealing temperature of 800 ° C in the flow to recrystallize the strip.

Bei einer Bruchdehnung A50 von 15,4 % betrug die Zugfestigkeit Rm des so erhaltenen Kaltbands 838 MPa.At a breaking elongation A 50 of 15.4%, the tensile strength R m of the cold strip thus obtained was 838 MPa.

Claims (9)

Verfahren zum Herstellen von Stahl-Flachprodukten, - bei dem ein ein Komplexphasen-Gefüge bildender Stahl folgender Zusammensetzung (in Gew.-%) C: 0,08 - 0,11 % Mn: 1,00 - 1,30 % P: ≤ 0,030 % S: ≤ 0,004 % Si: 0, 60 - 0,80 % Al: ≤ 0,05 % N: ≤ 0,0060 % Cr: 0,30 - 0,80 % Ti: 0,060 - 0,120 % Rest Eisen und unvermeidbare Verunreinigungen zu einem gegossenen Band mit einer Dicke von 1 - 4 mm vergossen wird, - bei dem das gegossene Band in einem kontinuierlichen Arbeitsablauf mit einem Umformgrad von mehr als 20 % in-Line bei einer im Bereich von 900 - 1100 °C liegenden Warmwalzendtemperatur zu einem Warmband mit einer Dicke von 0,5 - 3,2 mm warmgewalzt wird und - bei dem das Warmband bei einer 550 - 620 °C betragenden Haspeltemperatur gehaspelt wird, - so dass ein Warmband erhalten wird, dessen Zugfestigkeit Rm mindestens 800 MPa bei einer Bruchdehnung A80 von mindestens 10 % beträgt. Method for producing steel flat products, - in which a complex-phase structure forming steel of the following composition (in wt .-%) C: 0.08 - 0.11% Mn: 1.00 - 1.30% P: ≤ 0.030% S: ≤ 0.004% Si: 0, 60 - 0.80% Al: ≤ 0.05% N: ≤ 0.0060% Cr: 0.30 - 0.80% Ti: 0.060-0.120% Residual iron and unavoidable impurities is poured into a cast strip with a thickness of 1 - 4 mm, in which the cast strip is hot rolled in a continuous operation with a degree of deformation of more than 20% in-line at a hot rolling end temperature in the range of 900 to 1100 ° C to a hot strip of thickness 0.5 to 3.2 mm and - in which the hot-rolled strip is rewound at a coiler temperature of 550 - 620 ° C, - So that a hot strip is obtained whose tensile strength R m is at least 800 MPa at an elongation at break A 80 of at least 10%. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Breite des Warmbands mehr als 1.200 mm, insbesondere mehr als 1.600 mm beträgt.A method according to claim 1, characterized in that the width of the hot strip is more than 1,200 mm, in particular more than 1,600 mm. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Dicke des Warmbands höchstens 1,5 mm beträgt.Method according to one of the preceding claims, characterized in that the thickness of the hot strip is at most 1.5 mm. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass das Warmband zu einem Kaltband mit einer Dicke von 0,5 - 1,4 mm kaltgewalzt wird.Method according to one of the preceding claims, characterized in that the hot strip is cold rolled to a cold strip having a thickness of 0.5 - 1.4 mm. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das Kaltband bei einer Glühtemperatur von 750 - 850 °C geglüht wird.A method according to claim 4, characterized in that the cold strip is annealed at an annealing temperature of 750 - 850 ° C. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Zugfestigkeit des Kaltbands mindestens 800 MPa beträgt.A method according to claim 4 or 5, characterized in that the tensile strength of the cold strip is at least 800 MPa. Verfahren nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass das Kaltband eine Bruchdehnung A50 von mindestens 10 % aufweist.Method according to one of claims 4 to 6, characterized in that the cold strip has an elongation at break A 50 of at least 10%. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass das Warmband oder das Kaltband mit einer metallischen Beschichtung versehen wird.Method according to one of the preceding claims, characterized in that the hot strip or the cold strip is provided with a metallic coating. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die metallische Beschichtung eine Verzinkung ist.A method according to claim 8, characterized in that the metallic coating is a galvanizing.
EP06123134A 2006-10-30 2006-10-30 Process for manufacturing steel flat products from a steel forming a complex phase structure Not-in-force EP1918402B1 (en)

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ES06123134T ES2325960T3 (en) 2006-10-30 2006-10-30 PROCEDURE FOR MANUFACTURING STEEL FLAT PRODUCTS FROM A STEEL THAT FORM A STRUCTURE OF COMPLEX PHASES.
DE502006003830T DE502006003830D1 (en) 2006-10-30 2006-10-30 A method for producing steel flat products from a complex phase structure forming steel
AT06123134T ATE432372T1 (en) 2006-10-30 2006-10-30 METHOD FOR PRODUCING FLAT STEEL PRODUCTS FROM A STEEL FORMING A COMPLEX PHASE STRUCTURE
PL06123134T PL1918402T3 (en) 2006-10-30 2006-10-30 Process for manufacturing steel flat products from a steel forming a complex phase structure
EP06123134A EP1918402B1 (en) 2006-10-30 2006-10-30 Process for manufacturing steel flat products from a steel forming a complex phase structure
CN2007800400708A CN101528969B (en) 2006-10-30 2007-10-24 Method for manufacturing flat steel products from a steel forming a microduplex structure
PCT/EP2007/061388 WO2008052917A1 (en) 2006-10-30 2007-10-24 Method for manufacturing flat steel products from a steel forming a complex phase structure
US12/447,626 US20090277546A1 (en) 2006-10-30 2007-10-24 Method for manufacturing flat steel products from a steel forming a complex phase microstructure
JP2009533820A JP5232793B2 (en) 2006-10-30 2007-10-24 Method for producing a flat steel product from steel forming a composite phase microstructure
KR1020097007483A KR101458039B1 (en) 2006-10-30 2007-10-24 Method for manufacturing flat steel products from a steel forming a complex phase structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101928875A (en) * 2009-06-22 2010-12-29 鞍钢股份有限公司 High-strength cold-rolled plate with favorable forming property and preparation method thereof

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