EP2094876A1 - Process for producing a steel strip comprising a relatively high strength dual phase steel - Google Patents

Process for producing a steel strip comprising a relatively high strength dual phase steel

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Publication number
EP2094876A1
EP2094876A1 EP07817796A EP07817796A EP2094876A1 EP 2094876 A1 EP2094876 A1 EP 2094876A1 EP 07817796 A EP07817796 A EP 07817796A EP 07817796 A EP07817796 A EP 07817796A EP 2094876 A1 EP2094876 A1 EP 2094876A1
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European Patent Office
Prior art keywords
steel
hot
steel strip
strip
cold
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Granted
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EP07817796A
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German (de)
French (fr)
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EP2094876B1 (en
Inventor
Jürgen SPEHR
Thorsten Maiwald
Thomas Evertz
Manuel Otto
Sven Schulz
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Salzgitter Flachstahl GmbH
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Salzgitter Flachstahl GmbH
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Publication of EP2094876A1 publication Critical patent/EP2094876A1/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
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

It is an object of the invention to provide a steel which is suitable for continuous annealing of hot and cold strip. This object is achieved by a relatively high strength dual phase steel for a cold- or hot-rolled steel strip having excellent forming properties, in particular for light vehicle construction, comprising the elements indicated in claim 1, balance iron including customary steel-accompanying elements with optional addition of Ti, with the required dual phase microstructure being produced during continuous annealing and the cold- or hot-rolled steel strip being heated to a temperature in the range from 820 to 1000°C, preferably from 840 to 1000°C, in the continuous annealing furnace in a single-stage process and the annealed steel strip subsequently being cooled from the annealing temperature at a cooling rate of from 15 to 30°C/s.

Description

Verfahren zur Herstellung eines Stahlbandes aus einem höherfesten Dualphasenstahl Process for producing a steel strip from a high-strength dual-phase steel
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zur Herstellung eines kalt- oder warmgewalzten Stahlbandes aus einem höherfesten Dualphasenstahl mit ausgezeichneten Umformeigenschaften, insbesondere für den Fahrzeugleichtbau gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for producing a cold-rolled or hot-rolled steel strip from a high-strength dual-phase steel with excellent forming properties, in particular for lightweight vehicle construction according to the preamble of claim 1.
Der heiß umkämpfte Automobilmarkt zwingt die Hersteller u. a. ständig nach Lösungen zur Senkung des Flottenverbrauches unter Beibehaltung eines höchstmöglichen Komforts und größtmöglichem Insassenschutz zu suchen. Dabei spielt einerseits die Gewichtsersparnis aller Fahrzeug komponenten eine entscheidende Rolle, andererseits aber auch ein möglichst günstiges Verhalten der einzelnen Bauteile bei hoher statischer und dynamischer Beanspruchung im Betrieb, wie auch im Crashfall. Dieser Notwendigkeit versuchen die Lieferanten dadurch Rechnung zu tragen, dass durch die Bereitsteilung hochfester und höchstfester Stähle die Wanddicken reduziert werden können bei gleichzeitig verbessertem Bauteilverhalten bei dessen Fertigung und im Betrieb. Derartige Stähle müssen daher vergleichsweise hohen Anforderungen hinsichtlich Festigkeit, Dehnfähigkeit, Zähigkeit, Energieaufnahme und Verarbeitbarkeit, beispielsweise durch Kaltumformen, Schweißen und/oder Oberflächenbehandeln genügen.The hotly contested automotive market is forcing manufacturers u. a. constantly looking for solutions to reduce fleet consumption while maintaining the highest possible comfort and the greatest possible occupant protection. On the one hand, the weight saving of all vehicle components plays a decisive role, but on the other hand also the most favorable behavior of the individual components with high static and dynamic stress during operation, as well as in the event of a crash. Suppliers are trying to meet this need by reducing the wall thicknesses by providing high-strength and ultra-high-strength steels, while at the same time improving component behavior during production and operation. Such steels must therefore meet comparatively high requirements in terms of strength, ductility, toughness, energy absorption and processability, for example by cold forming, welding and / or surface treatment.
Zunehmende Anwendung für diesen Bereich finden hier die sog. Dualphasenstähle, die sich durch eine sehr gute Umformbarkeit bei gleichzeitig hohen Festigkeitswerten auszeichnen. Dualphasenstähle weisen dabei ein überwiegend ferritisch-martensitisches Gefüge auf.The so-called dual-phase steels, which are characterized by very good formability and simultaneously high strength values, are being used more and more frequently in this area. Dual phase steels have a predominantly ferritic-martensitic structure.
Betrachtet werden in diesem Zusammenhang sowohl kalt-, wie auch warmgewalzte Stahlbänder aus Dualphasenstahl.Both cold and hot rolled steel strips made of dual phase steel are considered in this context.
Üblicherweise werden kaltgewalzte Stahlbänder aus wirtschaftlichen Gründen im Durchlaufglühverfahren rekristallisierend zu gut umformbarem Feinblech geglüht.Usually, cold-rolled steel strips are annealed by recrystallization in a continuous annealing process to form a thin sheet which is easy to form.
Abhängig von der Legierungszusammensetzung und der Banddicke werden die Ofenparameter (Durchlaufgeschwindigkeit, Glühtemperatur, Abkühlgeschwindigkeit) entsprechend dem geforderten Gefüge und den mechanisch-technologischen Eigenschaften eingestellt. Zur Einstellung des Dualphasengefüges wird das Kaltband im Durchlaufglühofen auf eine solche Temperatur aufgeheizt, dass sich während der Abkühlung die geforderte ferritisch- martensitische Gefügeausbildung einstellt.Depending on the alloy composition and the strip thickness, the furnace parameters (throughput speed, annealing temperature, cooling rate) are set according to the required microstructure and the mechanical-technological properties. To set the dual-phase microstructure, the cold strip is heated in the continuous annealing furnace to a temperature such that the required ferritic-martensitic microstructure formation occurs during cooling.
Wenn aufgrund hoher Korrosionsanforderungen die Oberflächen von Warm- oder Kaltbändern schmelztauchverzinkt werden sollen, wird die Glühbehandlung üblicherweise in einem dem Verzinkungsbad vorgeschalteten Durchlaufglühofen durchgeführt.If, due to high corrosion requirements, the surfaces of hot or cold strips are to be hot dip galvanized, the annealing treatment is usually carried out in a continuous annealing furnace upstream of the galvanizing bath.
Auch beim Warmband wird je nach Legierungskonzept fallweise das geforderte Dualphasen- gefüge erst bei der Glühbehandlung im Durchlaufofen eingestellt, um ausgehend von einem möglichst homogenen Austenitgefüge die geforderten mechanischen Eigenschaften realisieren zu können.Depending on the alloy concept, the required dual-phase structure is also occasionally set for the hot-rolled strip during the annealing treatment in the continuous furnace, in order to be able to realize the required mechanical properties on the basis of a homogenous austenite microstructure.
Beim Durchlaufglühen von warm- oder kaltgewalzten Stahlbändern mit z. B. aus den Schriften EP 0 152 665 B1 , EP 0691 415 B1 und EP 0510 718 B1 bekannten Legierungskonzepten für Dualphasenstähle besteht ein Problem darin, dass nur ein enges Prozessfenster für die Glühparameter vorhanden ist, um gleichmäßige mechanische Eigenschaften über die Bandlänge zu gewährleisten.In the continuous annealing of hot or cold rolled steel strips with z. For example, from the writings EP 0 152 665 B1, EP 0691 415 B1 and EP 0510 718 B1 known alloy concepts for dual-phase steels is a problem that only a narrow process window for the annealing parameters is present to ensure uniform mechanical properties over the tape length.
Um eine zum Erreichen des geforderten Dualphasengefüges ausreichende Umwandlungsträgheit dieser Stähle bei der rekristallisierenden Glühung des Kaltbandes zu erreichen, weisen die bekannten Stähle entsprechende Gehalte z. B. an Cr, Mo, Nb oder B auf. Insbesondere wirken sich hier die kostenträchtigen Elemente Cr und Mo stark auf die Herstellkosten des Dualphasenstahles aus.In order to achieve sufficient to achieve the required dual phase microstructural inertia of these steels in the recrystallizing annealing of the cold strip, the known steels have corresponding contents z. B. on Cr, Mo, Nb or B. In particular, the costly elements Cr and Mo have a strong effect on the production costs of the dual-phase steel.
Ein enges Prozessfenster bedeutet in diesem Zusammenhang, dass je nach Dicke des zu glühenden Bandes die Durchlaufgeschwindigkeit angepasst werden muss, um eine homogene Temperaturverteilung im Band und bei der Abkühlung das geforderte Dualphasengefüge und die mechanisch-technlogischen Eigenschaften zu erreichen.A narrow process window in this context means that, depending on the thickness of the strip to be annealed, the throughput speed has to be adjusted in order to achieve a homogeneous temperature distribution in the strip and during cooling the required dual-phase structure and the mechanical-technological properties.
Bei großen Prozessfenstern sind bei gleichen Ofenparametern die geforderten Bandeigenschaften auch bei unterschiedlich dicken zu glühenden Bändern zu realisieren.In the case of large process windows, the required strip properties can be achieved with the same furnace parameters even with different thicknesses of strips to be annealed.
Während der Fertigung müssen oftmals je nach Vorgabe auch Bänder mit unterschiedlicher Dicke, z. B. 1 ,5 und 2,0 mm, nacheinander geglüht werden. Eine homogene Temperaturverteilung ist gerade bei unterschiedlichen Dicken im Übergangsbereich vom einen Band zum anderen nur schwierig zu realisieren und führt bei Legierungszusammensetzungen mit zu kleinem Prozessfenster dazu, dass das dünnere Band entweder zu langsam durch den Ofen gefahren wird, was die Produktivität senkt, andererseits wenn das dickere Band zu schnell durch den Glühofen gefahren wird, besteht die Gefahr, dass eine homogene Temperaturverteilung und damit die geforderten mechanisch-technologischen Eigenschaften nicht erreicht werden. Die Folge sind vermehrter Ausschuss oder sogar Reklamationen beim Kunden.During production often have to be different depending on the specification and tapes of different thickness, for. B. 1, 5 and 2.0 mm, are annealed successively. Homogeneous temperature distribution is difficult to realize, especially with different thicknesses in the transition region from one belt to the other and leads to too small a process window that the thinner belt is either driven too slowly through the furnace, which reduces productivity, on the other hand, if thicker belt is driven too fast through the annealing furnace, there is a risk that a homogeneous temperature distribution and thus the required mechanical and technological properties are not achieved. The result is increased rejection or even customer complaints.
Besonders gravierend wird das Problem eines zu engen Prozessfensters bei der Glühbehandlung dann, wenn belastungsoptimierte Bauteile aus Warm- oder Kaltband hergestellt werden sollen, die über die Bandlänge und ggf. -breite variierende Blechdicken aufweisen, also flexibel gewalzt worden sind. Ein Verfahren zur Herstellung eines Stahlbandes mit unterschiedlicher Dicke über die Bandlänge wird z. B. in der DE 100 37 867 A1 beschrieben.The problem of a too narrow process window in the annealing treatment becomes particularly serious when load-optimized components are to be produced from hot or cold strip which have varying sheet thicknesses over the strip length and possibly width, ie have been flexibly rolled. A method for producing a steel strip with different thickness over the strip length is z. B. in DE 100 37 867 A1.
Bei Anwendung der bekannten Legierungskonzepte für Dualphasenstähle ist es auf Grund des engen Prozessfensters schon beim Durchlaufglühen unterschiedlich dicker Bänder nur schwer möglich, über die gesamte Bandlänge des jeweiligen Bandes gleichmäßige mechanische Eigenschaften zu erreichen.When using the known alloy concepts for dual-phase steels, it is difficult to achieve uniform mechanical properties over the entire strip length of the respective strip due to the narrow process window already in the continuous annealing of different thickness tapes.
Bei flexibel gewalzten Warm- oder Kaltbändern aus Stählen bekannter Zusammensetzungen weisen dann bei zu kleinem Prozessfenster die Bereiche mit kleinerer Blechdicke aufgrund der Umwandlungsvorgänge bei der Abkühlung entweder zu niedrige Festigkeiten durch zu große Ferritanteile auf oder die Bereiche mit größerer Blechdicke erreichen zu hohe Werte durch zu große Martensitanteile. Homogene mechanisch-technologische Eigenschaften über die Bandlänge oder -breite sind mit den bekannten Legierungskonzepten beim Durchlaufglühen praktisch nicht zu erreichen.In the case of flexibly rolled hot or cold strips of steels of known compositions, if the process window is too small, the areas with smaller sheet thickness will either have too low strengths due to excessive ferrite rates or the areas with larger sheet thickness will reach too high values martensite. Homogeneous mechanical-technological properties over the strip length or width are virtually impossible to achieve with the known alloy concepts in continuous annealing.
Der Erfindung liegt daher die Aufgabe zugrunde, ein anderes kostengünstigeres Legierungskonzept für einen höherfesten Stahl mit Dualphasengefüge anzugeben, mit dem das Prozessfenster für die Durchlaufglühung von Warm- oder Kaltbändern so erweitert werden kann, dass neben verschieden dicken Bändern auch Stahlbänder mit über Bandlänge und ggf. Bandbreite variierender Dicke mit möglichst homogenen mechanisch-technologischen Eigenschaften erzeugt werden können. Nach der Lehre der Erfindung wird diese Aufgabe gelöst durch einen Stahl mit folgendenThe invention is therefore based on the object of specifying another cost-effective alloy concept for a high-strength steel with dual-phase structure, with which the process window for the continuous annealing of hot or cold strips can be extended so that in addition to different thickness bands and steel bands with over tape length and possibly Bandwidth varying thickness can be produced with the most homogeneous mechanical and technological properties. According to the teachings of the invention, this object is achieved by a steel with the following
Gehalten in Masse %:Held in mass%:
C 0,1 bis < 0,16C 0.1 to <0.16
AI 0,02 bis < 0,05AI 0.02 to <0.05
Si 0,40 bis < 0,60Si 0.40 to <0.60
Mn 1 ,5 bis < 2,0Mn 1, 5 to <2.0
P < 0,020P <0.020
S < 0,003S <0.003
N < 0,01N <0.01
Nb = 0,01Nb = 0.01
V = 0,02V = 0.02
Rest Eisen einschließlich üblicher stahlbegleitender Elemente, mit optionaler Zugabe von Ti, wobei das geforderte Dualphasengefüge während einer Durchlaufglühung erzeugt wird, und wobei das kalt- oder warmgewalzte Stahlband im Durchlaufglühofen in einem einstufigenRemainder of iron, including conventional steel-supporting elements, with optional addition of Ti, whereby the required dual-phase structure is produced during a continuous annealing, and wherein the cold-rolled or hot-rolled steel strip is in a one-stage annealing furnace
Prozess auf eine Temperatur im Bereich von 820 bis 10000C, vorzugsweise 840 bis 1000°C aufgeheizt wird, und das geglühte Stahlband anschließend von der Glühtemperatur mit einerProcess is heated to a temperature in the range of 820 to 1000 0 C, preferably 840 to 1000 ° C, and the annealed steel strip then from the annealing temperature with a
Abkühlgeschwindigkeit zwischen 15 und 30 °C/s abgekühlt wird.Cooling rate between 15 and 30 ° C / s is cooled.
Der erfindungsgemäße höherfeste Dualphasenstahl für den Fahrzeugleichtbau zeichnet sich dadurch aus, dass mit einer gezielten Zugabe von V und Nb unter Verzicht der kostenträchtigen Legierungselemente Mo oder Cr, eine so hohe Umwandlungsträgheit erreicht wird, die dazu führt, dass während des Durchlaufglühens auch bei Bändern mit über Bandlänge oder - breite variierender Dicke aus einer vollständig austenitischen Matrix mit sehr hoher Prozesssicherheit das geforderte Dualphasengefüge mit homogenen mechanisch-technologischen Eigenschaften eingestellt werden kann.The inventive high-strength dual-phase steel for lightweight vehicle construction is characterized by the fact that with a targeted addition of V and Nb waiving the costly alloying elements Mo or Cr, such a high conversion inertia is achieved, which leads to the fact that during the continuous annealing also in bands with over Band length or width of varying thickness of a fully austenitic matrix with very high process reliability the required dual-phase microstructure with homogeneous mechanical-technological properties can be adjusted.
Bei umfangreichen Laboruntersuchungen hat sich überraschenderweise herausgestellt, dass durch eine gezielte Zugabe von V in Kombination mit Nb, ein Dualphasenstahl bereitgestellt wird, der ein deutlich erweitertes Prozessfenster bei der Durchlaufglühung ermöglicht. Auch bei Glühung von Bändern mit unterschiedlicher Dicke oder bei Bändern mit variierender Dicke können bei sonst konstanten Ofenparametern gleiche Gefügeausbildungen und mechanisch-technologische Eigenschaften der Bänder erreicht werden.Extensive laboratory investigations have surprisingly revealed that a targeted addition of V in combination with Nb, a dual-phase steel is provided, which allows a significantly extended process window in the continuous annealing. Even with annealing of strips with different thicknesses or with strips of varying thickness, the same microstructures and mechanical and technological properties of the strips can be achieved with otherwise constant furnace parameters.
Der erfindungsgemäße Stahl bietet den Vorteil eines deutlich vergrößerten Prozessfensters im Vergleich zu den bekannten Stählen. Hieraus resultiert eine erhöhte Prozesssicherheit beim Durchlaufglühen oder Feuerverzinken von Kalt- und Warmband mit Dualphasengefüge. Somit können sowohl für feuerverzinkte, wie auch nur durchlaufgeglühte Warm- oder Kaltbänder homogenere mechanisch-technologische Eigenschaften im Band gewährleistet werden. Dies gilt für das Durchlaufglühen aufeinander folgender Bänder mit unterschiedlicher Banddicke und auch im Besonderen für Bänder mit variierender Blechdicke über Bandlänge bzw. -breite.The steel according to the invention offers the advantage of a significantly enlarged process window in comparison to the known steels. This results in increased process reliability during continuous annealing or hot-dip galvanizing of cold and hot strip with dual-phase structure. Thus, both hot-dip galvanized, as well as only pass-annealed hot or Cold strips more homogeneous mechanical-technological properties are guaranteed in the band. This applies to the continuous annealing of successive bands with different strip thickness and also in particular for strips with varying sheet thickness over strip length or width.
Werden erfindungsgemäß im Durchlaufglühverfahren erzeugte höherfeste Warm- oder Kaltbänder aus Dualphasenstahl mit variierenden Blechdicken erzeugt, können aus diesem Material vorteilhaft belastungsoptimierte Bauteile umformtechnisch hergestellt werden.If, according to the invention, higher-strength hot or cold strips made of dual-phase steel produced by continuous annealing are produced with varying sheet thicknesses, stress-optimized components can advantageously be produced by deformation from this material.
Erfindungsgemäß handelt es sich um einen Dualphasenstahl mit ca. 20 % inselförmig eingelagertem Martensit in der Festigkeitsklasse von ca. 800MPa, insbesondere zum kontinuierlichen Feuerverzinken sowie für den Einsatz in einer Durchlaufglühanlage.According to the invention, it is a dual-phase steel with about 20% martensite embedded in the strength class of about 800 MPa, in particular for continuous hot-dip galvanizing and for use in a continuous annealing plant.
Durch den optionalen Zusatz von Ti in Gehalten von < 0,01 % wird erfindungsgemäß über die Bildung von Nitriden oder Carbonitriden in Abhängigkeit vom N-Gehalt des Stahles die Feinkörnigkeit des Gefüges eingestellt und die mechanisch-technologischen Eigenschaften beeinflusst.By the optional addition of Ti in contents of <0.01%, the fine granularity of the microstructure is adjusted according to the invention via the formation of nitrides or carbonitrides as a function of the N content of the steel, and the mechanical and technological properties are influenced.
Das Einsatzgebiet des Stahls für das Walzen mit flexiblen Blechdicken in Längs- und Querrichtung zur Walzrichtung wird durch seine Unempfindlichkeit gegen Prozessschwankungen während der Wärmebehandlung eröffnet.The field of application of the steel for rolling with flexible sheet thicknesses in the longitudinal and transverse direction to the rolling direction is opened by its insensitivity to process fluctuations during the heat treatment.
Diese Unempfindlichkeit wird durch den Einsatz von Nb und vor allem V hervorgerufen, die während der Abkühlung eine umwandlungsträge bzw. umwandlungsfreie Zone bedingen.This insensitivity is caused by the use of Nb and especially V, which require a conversion-free or conversion-free zone during cooling.
Um einen entsprechenden Effekt zu erreichen, weist der Stahl erfindungsgemäß einen V- Gehalt von mindestens 0,02% und einen Nb-Gehalt von mindestens 0,01% auf. Hierbei wirkt Nb ebenfalls als kornfeinendes Element, wobei die Höhe der Nb-Zugabe an den aktuellen C- und N-Gehalt des Stahles angepasst ist.In order to achieve a corresponding effect, the steel according to the invention has a V content of at least 0.02% and an Nb content of at least 0.01%. Here, Nb also acts as a grain refining element, with the amount of Nb addition being adjusted to the actual C and N content of the steel.
Erfindungsgemäß wird die Zugabe von V ebenfalls an die Gehalte von C und N angepasst, wobei die Höhe der Zugabe aber so eingestellt ist, dass zum Erreichen einer ausreichend großen Umwandlungsträgheit genügend V in Lösung gehalten wird. Wird ein möglichst umwandlungsträges Verhalten und damit ein möglichst breites Prozessfenster bei der Durch- laufglühung angestrebt, beträgt der V-Gehalt mindestens 0,06 bis 0,10% und der Nb-Gehalt mehr als 0,02 bis 0,05%. Eine weitere Steigerung der Gehalte an V oder Nb bringt dann keine weitere Verbesserung im Hinblick auf eine weiter verzögerte Umwandlung des Stahles und damit auf die Breite des Prozessfensters bei der Durchlaufglühung.According to the invention, the addition of V is also adjusted to the contents of C and N, but the amount of addition is adjusted so that enough V is kept in solution to achieve a sufficiently high conversion inertia. If the aim is to achieve the best possible conversion behavior and thus the widest possible process window in the continuous annealing, the V content is at least 0.06 to 0.10% and the Nb content is more than 0.02 to 0.05%. A further increase in the contents of V or Nb then brings no further improvement with regard to a further delayed transformation of the steel and thus to the width of the process window in the continuous annealing.
Um ein möglichst homogenes Ausgangsgefüge für die Einstellung des Dualphasengefüges zu erreichen, wird das zu glühende Band zunächst auf eine solche Temperatur erwärmt, dass ein vollaustenitisches Gefüge vorliegt. Die Glühtemperaturen liegen dabei für den erfindungsgemäßen Stahl zwischen ca. 820 und ca. 10000C, abhängig von der konkreten Legierungszusammensetzung.In order to achieve a homogeneous starting structure for the adjustment of the dual-phase structure, the band to be annealed is first heated to a temperature such that a fully austenitic structure is present. The annealing temperatures are for the steel according to the invention between about 820 and about 1000 0 C, depending on the specific alloy composition.
Bei den durchgeführten Untersuchungen hat sich herausgestellt, dass für diesen Stahl eine Zone existiert, in welcher trotz Temperaturen kleiner als 8000C keine Rückumwandlung von Austenit in Ferrit, Bainit oder Martensit stattfindet. Wichtig ist hierbei besonders der Temperaturbereich um 4500C, da hier die Zinkbadtemperatur in der Feuerverzinkung liegt.In the investigations carried out, it has been found that there is a zone for this steel in which, in spite of temperatures below 800 ° C., no return transformation of austenite into ferrite, bainite or martensite takes place. What is important here especially the temperature range around 450 0 C, since the zinc bath temperature is in the hot-dip galvanizing.
Der sich während der Abkühlung einstellende Gehalt an Ferrit und (Rest) Austenit bleibt bis nach dem Prozessschritt „Verzinken" erhalten. Der noch vorhandene Austenitanteil wandelt dann bei weiterer Abkühlung vollständig zu Martensit um. Die Verzinkungsparameter können über einen großen Bereich variieren. In Abhängigkeit von der Blechdicke liegen die Verzin- kungsgeschwindigkeiten zwischen 60 und 120m/min. Die Kühlraten vor und nach dem Zinkbad liegen bei relativ niedrigen 10 bis 30 °C/sec.The content of ferrite and (remainder) austenite during cooling is retained until after the "galvanizing" process step, and the remaining austenite part then converts completely to martensite on further cooling.The galvanizing parameters can vary over a wide range The plate thickness is between 60 and 120 m / min and the cooling rates before and after the zinc bath are relatively low at 10 to 30 ° C / sec.
Das erzeugte Material kann sowohl als Kalt- wie auch als Warmband, im dressierten und un- dressierten und auch im wärmebehandelten Zustand (Zwischenglühen) über eine Feuerverzinkungslinie oder reine Durchlaufglühanlage prozessiert werden.The material produced can be processed both as a cold strip and as a hot strip, in the dressed and untreated and also in the heat-treated state (intermediate annealing) via a hot-dip galvanizing line or pure continuous annealing plant.
Gleichzeitig besteht die Möglichkeit, durch gezielte Variierung der Abkühlbedingungen vor dem Zinkbad den Ferritanteil zu erhöhen oder zu verringern. Dadurch ist z. B. auch die Erzeugung von partialmartensitischen Stählen (PM) möglich. At the same time it is possible to increase or decrease the ferrite content by deliberately varying the cooling conditions before the zinc bath. This is z. As the production of partial martensitic steels (PM) possible.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines kalt- oder warmgewalzten Stahlbandes aus einem höherfesten Dualphasenstahl mit ausgezeichneten Umformeigenschaften, insbesondere für den Fahrzeugleichtbau, bestehend aus den Elementen (Gehalte in Masse-%):1. A process for producing a cold-rolled or hot-rolled steel strip from a high-strength dual-phase steel with excellent forming properties, in particular for lightweight vehicle construction, consisting of the elements (contents in% by mass):
C 0,1 bis < 0,16C 0.1 to <0.16
AI 0,02 bis < 0,05AI 0.02 to <0.05
Si 0,40 bis < 0,60Si 0.40 to <0.60
Mn 1 ,5 bis < 2,0Mn 1, 5 to <2.0
P < 0,020P <0.020
S < 0,003S <0.003
N < 0,01N <0.01
Nb = 0,01Nb = 0.01
V = 0,02V = 0.02
Rest Eisen einschließlich üblicher stahlbegleitender Elemente, mit optionaler Zugabe von Ti, wobei das geforderte Dualphasengefüge während einer Durchlaufglühung erzeugt wird, dadurch gekennzeichnet, dass das kalt- oder warmgewalzte Stahlband im Durchlaufglühofen in einem einstufigen Prozess auf eine Temperatur im Bereich von 820 bis 10000C, vorzugsweise 840 bis 10000C aufgeheizt wird, und dass das geglühte Stahlband anschließend von der Glühtemperatur mit einer Abkühlgeschwindigkeit zwischen 15 und 30 °C/s abgekühlt wird.The remainder of iron including conventional steel-supporting elements, with optional addition of Ti, wherein the required dual-phase structure is produced during a continuous annealing, characterized in that the cold- or hot-rolled steel strip in the continuous annealing furnace in a single-stage process to a temperature in the range of 820 to 1000 0 C. , preferably 840 to 1000 0 C is heated, and that the annealed steel strip is then cooled from the annealing temperature at a cooling rate between 15 and 30 ° C / s.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der V- Gehalt = 0,06% beträgt.2. The method according to claim 1, characterized in that the V content = 0.06%.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der V- Gehalt = 0,08% beträgt.3. The method according to claim 1, characterized in that the V content = 0.08%.
4. Verfahren nach den Ansprüchen 1 - 3 dadurch gekennzeichnet, dass der Nb- Gehalt = 0,02% beträgt. 4. Process according to claims 1-3, characterized in that the Nb content = 0.02%.
5. Verfahren nach den Ansprüchen 1 - 3, dadurch gekennzeichnet, dass der Nb- Gehalt = 0,04% beträgt.5. Process according to claims 1-3, characterized in that the Nb content = 0.04%.
6. Verfahren nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass der Ti-Gehalt < 0,01 % beträgt.6. The method according to any one of claims 1-5, characterized in that the Ti content is <0.01%.
7. Verfahren nach einem der Ansprüche 1-6, dadurch gekennzeichnet, dass das Stahlband einer Schmelztauchveredelung unterzogen wird.7. The method according to any one of claims 1-6, characterized in that the steel strip is subjected to a Schmelztauchveredelung.
8. Verfahren nach einem der Ansprüche 1-7, dadurch gekennzeichnet, dass das Stahlband anschließend dressiert wird 8. The method according to any one of claims 1-7, characterized in that the steel strip is then trained
EP07817796.1A 2006-11-14 2007-11-13 Process for producing a steel strip comprising a relatively high strength dual phase steel Active EP2094876B1 (en)

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KR20090089311A (en) 2009-08-21
US20100000634A1 (en) 2010-01-07
RU2443787C2 (en) 2012-02-27
RU2009122381A (en) 2010-12-20
DE102006054300A1 (en) 2008-05-15
WO2008058530A1 (en) 2008-05-22

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