EP1319725A2 - Hot strip manufacturing process - Google Patents

Hot strip manufacturing process Download PDF

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Publication number
EP1319725A2
EP1319725A2 EP02025150A EP02025150A EP1319725A2 EP 1319725 A2 EP1319725 A2 EP 1319725A2 EP 02025150 A EP02025150 A EP 02025150A EP 02025150 A EP02025150 A EP 02025150A EP 1319725 A2 EP1319725 A2 EP 1319725A2
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EP
European Patent Office
Prior art keywords
hot
strip
mpa
temperature
tensile strength
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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
EP02025150A
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German (de)
French (fr)
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EP1319725B1 (en
EP1319725A3 (en
Inventor
Thomas Dr.-Ing. Heller
Werner Zimmermann
Günther Dipl.-Ing. Stich
Bernhard Dr.-Ing. Engl
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Stahl AG
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Publication of EP1319725A2 publication Critical patent/EP1319725A2/en
Publication of EP1319725A3 publication Critical patent/EP1319725A3/en
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    • 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
    • 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
    • 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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment

Definitions

  • Hot strips are increasingly used today Motor vehicle construction for the production of so-called "crash-relevant" components used. It is about components of a motor vehicle that absorb an excessive amount of kinetic energy in an accident and convert it into deformation energy. Around Minimum weight requirements will be met hot strips desired by users, which have a high, strength of at least 800 MPa and a at the same time good cold formability with a thickness of have one to four millimeters.
  • Hot strips intended for this purpose are, for example known from WO 98/40522 and DE 197 19 546 C2.
  • Around to achieve the required strengths contain the known hot strips in each case at least 0.1% by weight Carbon. In this way, strengths of reach up to 1400 MPa. The comparable high However, carbon levels pull a relatively poor one Weldability of the known hot strips.
  • the object of the invention was a to create cost-effective procedures, which enables the properties of high strength, well deformable hot strip on the respective To optimize the intended use.
  • a steel is processed that has low, has sub-peritectic levels of carbon.
  • Such steel can be on a casting and rolling line to thin slabs or on a belt caster shed cast tape.
  • the raw material thus obtained can be made directly to hot strip with low Roll thicknesses from 0.8 mm to 4 mm, for example.
  • the due to the low carbon content Allows good pourability of the invention
  • the steel used allows a continuous ongoing manufacturing process for hot strip production to use. In this way it can be compared to conventional manufacturing method much simplified Process flow inexpensive a hot strip provide that as soon as you leave the Hot strip mill has a thickness, as in particular in automotive engineering for the production of structural elements Body is needed, and at the same time is that its properties after graduation a suitable cooling by choosing one certain reel temperature for each Purpose can be optimized.
  • the low carbon content becomes strength achieved as otherwise only with higher carbon Steels are possible.
  • Hot rolling is ended according to the invention at temperatures above the Ar 3 temperature, since high hot rolling end temperatures have a favorable effect on the rollability and the state of solution of the microalloying elements.
  • the invention is carried out in an intensive, two-stage manner known per se performed cooling of the band.
  • this cooling becomes a pearlite-free, low-carbon bainitic Structure with hardness-increasing proportions of martensite and Preserved austenite.
  • the choice of the reel temperature is essential since according to the invention by the choice of the reel temperature targeted setting of the desired Material properties takes place. In any case tensile strengths of at least 800 MPa are achieved.
  • High reel temperatures of at least 580 ° C lead to a hot strip that has a high yield ratio and associated with it has a high yield strength.
  • Such hot strips are particularly suitable for Manufacture of weakly deformed components in which a high work hardening of the steel due to lack of Deformation is not usable, but in the case of a high energy absorption capacity in the elastic range is needed.
  • the hot strip is used at temperatures in the range of 450 ° C coiled up to 580 ° C, the hot strip obtained has a lower yield strength ratio and therefore one lower yield strength. At the same time they own it procured hot strips produced according to the invention a high solidification capacity even at low Deformation.
  • Hot strips can be made by lowering the reel temperature below 250 ° C, especially below 100 ° C. at such low reel temperatures becomes a hot strip obtained, which has a minimum tensile strength of 900 MPa with a low yield ratio. It thus has the property profile of a Complex phase steel, such as from the WO98 / 40522 is known. In contrast to the known one However, CP steel has one according to the invention significantly lower carbon content and a accordingly improved weldability.
  • the steel 0.05 wt% to 0.07 wt% Contains carbon. It can also be useful to Increasing the hardness of the steel has a Si content of 0.3% by weight to 0.8% by weight, in particular 0.5% by weight to 0.8% by weight. By calcium treatment leaves influence the sulfide form favorably.
  • a compensating furnace must be provided, the primary material before it is hot rolled, passes.
  • the primary material should be in the compensating furnace heated to a temperature above 1050 ° C be high enough Keep microalloying elements in solution.
  • hot strip produced according to the invention is suitable for a Surface finishing, especially for a electrolytic galvanizing or hot-dip galvanizing.
  • Hot strip produced according to the invention in a special way for the production of highly stressed Structural elements for vehicle body construction.
  • elements can be, for example Side impact beams, bumpers, reinforcement elements, Act frame structures, profiles or similar.
  • Hot strip can be produced by cold forming, whereby especially roll profiling for shaping suitable. An additional heat or other Compensation treatment to increase the strength of the components obtained is not regularly required.
  • Hot strip produced according to the invention can be over it roll out to cold strip. Both are suitable hot strip produced according to the invention and also the result thereof rolled cold strip in a special way for a Hot-dip galvanizing.
  • a steel melt with (in% by weight) 0.058% C, 0.61% Si, 1.72% Mn, 0.015% P, 0.001% S, 0.026% Al, 0.0057% N, 0.34% Cr, 0.117% Ti, 0.01% Cu, 0.021% Ni, 0.0028% Ca, rest of iron and unavoidable impurities is in a casting and rolling system has been cast into one strand, from which subsequently in a continuous Process flow thin slabs were divided. As well The thin slabs then have uninterrupted Homogenization of their temperature distribution and their Structure structure one with a temperature above 1050 ° C lying temperature operated compensating furnace go through before continuously in one Hot rolling line for hot strips A1-A5, B1-B10 and C ready have been hot rolled.
  • Hot strips A1-A5, B1-B10 and C are in a first cooling stage with a cooling rate CR of at least 150 K / s have been intensively cooled to an intermediate temperature ZT, on which they then have at least three and at most cooling break of ten seconds without active cooling have been held.
  • a second cooling stage they are Hot strips then from the intermediate temperature ZT Air or under the influence of a coolant accelerated cooled down to a reel temperature HT Service.
  • Table 1 shows the final rolling temperature ET, the cooling rate CR, the intermediate temperature ZT, the reel temperature HT and the thickness D for the hot strips A1-A5, B1-B10 and C.
  • hot strip ET CR ZT HT D [° C] [K / s] [° C] [° C] [Mm]
  • the hot strips A1-A5 coiled at high reel temperatures HT above 580 ° C. each have a pronounced yield strength R e at tensile strengths between 800 MPa and 900 MPa, which is regularly above 690 MPa, in particular above 740 MPa. Accordingly, they have a high energy absorption capacity in the elastic range and are therefore particularly suitable for the production of components that should be able to safely absorb high forces even in the undeformed state or with little deformation.
  • the hot strips B1-B10 coiled in the middle reel temperature range from 450 ° C to 580 ° C also regularly achieve tensile strengths that are above 800 MPa and below 900 MPa.
  • the hot strips B1-B10 have a continuous transition from elastic to plastic deformation, for which a yield strength R p0.2 of less than 690 MPa and a lower yield strength ratio R p0.2 / R m are determined compared to the hot strips A1-A5 has been.
  • the hot strips B1-B10 can therefore be cold-formed particularly well into components that must have a high level of hardening capacity even with little deformation.
  • Hot strips of the type in question are here additional hot strips B11, B12 have been produced.
  • the at their manufacture set Hot strip end temperature ET (900 ° C), cooling rate CR and intermediate temperature ZT (600 ° C) was there comparable to that in the production of hot strips B1 parameters set up to B10.
  • the reel temperature HT in the production of the hot strip B11 was 510 ° C, while on during the production of the hot strip B12 530 ° C was set.
  • the hot bands B11, B12 are then hot-dip galvanized. It is the same Hot strip C e has been subjected to hot-dip galvanizing.
  • hot strips B11, B12 regularly have particularly high strengths R m of at least 880 MPa at annealing temperatures which are less than 800 ° C. If the hot strip C is annealed at annealing temperatures of less than 800 ° C, the strengths R m achieved are at least 900 MPa.
  • the yield strength R e of the galvanized hot strips B11, B12, C is at least at the level of the hot strips B11, B12 and C.
  • the level of uniform elongation A gl and the elongation at break A80 of the galvanized hot strips B11, B12 and C is above the level of the hot strips B11, B12, C from which they were cold-rolled for each of the annealing temperatures.

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

Abstract

Production of a hot strip having a tensile strength of at least 800 N/mm<2> comprises casting a steel into a pre-material, such as thin slabs or cast strip; hot rolling the pre-material at a final temperature lying above the Ar3 temperature to form a hot strip; cooling in a first cooling step at a cooling speed of at least 150 K/s to 500-700 degrees C; and cooling in a second cooling step after a 3-10 seconds cooling pause to a coiling temperature. The coiling temperature is more than 580 degrees C for hot strips having a yield point of more than 690 MPa and a tensile strength of less than 900 MPa. The coiling temperature is 580 degrees C or less for hot strips having a yield point of not more than 690 MPa and a tensile strength of less than 900 MPa. The coiling temperature is not more than 250 degrees C for hot strips having a tensile strength of less than 900 MPa. <??>The steel contains (in wt.%): 0.03-0.10 C, not more than 0.8 Si, 1.2-2.0 Mn, 0.02-0.06 Al, not more than 0.5 Cr, not more than 0.2 Ti, not more than 0.08 Nb, less than 0.005 Ca, less than 0.05 Cu, less than 0.05 Ni, less than 0.02 P, less than 0.005 S, less than 0.01 N and a balance of Fe. <??>Preferred Features: The steel contains 0.05-0.07 wt.% C and 0.3-0.8 wt.% Si.

Description

Warmbänder werden heute in zunehmenden Maße im Kraftfahrzeugbau für die Herstellung sogenannter "crashrelevanter" Bauelemente verwendet. Es handelt sich dabei um solche Bauteile eines Kraftfahrzeugs, die bei einem Unfall in hohem Maße kinetische Energie aufnehmen und in Verformungsenergie umwandeln. Um diese Anforderungen bei minimiertem Gewicht zu erfüllen, werden von den Verwendern Warmbänder gewünscht, die eine hohe, mindestens 800 MPa betragende Festigkeit und eine gleichzeitig gute Kaltverformbarkeit bei einer Dicke von ein bis vier Millimeter aufweisen.Hot strips are increasingly used today Motor vehicle construction for the production of so-called "crash-relevant" components used. It is about components of a motor vehicle that absorb an excessive amount of kinetic energy in an accident and convert it into deformation energy. Around Minimum weight requirements will be met hot strips desired by users, which have a high, strength of at least 800 MPa and a at the same time good cold formability with a thickness of have one to four millimeters.

Für diesen Zweck bestimmte Warmbänder sind beispielsweise aus der WO 98/40522 und der DE 197 19 546 C2 bekannt. Um die geforderten Festigkeiten zu erreichen, enthalten die bekannten Warmbänder jeweils mindestens 0,1 Gew.-% Kohlenstoff. Auf diese Weise lassen sich Festigkeiten von bis zu 1400 MPa erreichen. Die vergleichbar hohen Kohlenstoffgehalte ziehen jedoch eine relativ schlechte Schweißbarkeit der bekannten Warmbänder nach sich. Darüber hinaus lassen sich Stähle, deren Kohlenstoffgehalt im peritektischen Bereich (0,08 Gew.-% bis 1,4 Gew.-%) liegt, nicht auf einer Gießwalzanlage verarbeiten.Hot strips intended for this purpose are, for example known from WO 98/40522 and DE 197 19 546 C2. Around to achieve the required strengths contain the known hot strips in each case at least 0.1% by weight Carbon. In this way, strengths of reach up to 1400 MPa. The comparable high However, carbon levels pull a relatively poor one Weldability of the known hot strips. In addition, steels, their Carbon content in the peritectic range (0.08% by weight up to 1.4% by weight), not on a casting and rolling system to process.

Auf einer solchen Gießwalzanlage werden Stahlschmelzen zu einem Strang vergossen, von dem dann in einem kontinuierlichen Verfahrensablauf Dünnbrammen abgeteilt werden, die, erforderlichenfalls nach Durchlauf eines Ausgleichsofens, ebenso kontinuierlich zu Warmband gewalzt werden. Diese Vorgehensweise ermöglicht es, besonders dünne Warmbänder kostengünstig herzustellen.Steel melts become on such a casting and rolling system shed in one strand, of which then in one continuous process flow divided thin slabs be, if necessary after passing through a Compensating furnace, also continuously to hot strip be rolled. This procedure enables to produce particularly thin hot strips at low cost.

Aus der DE 199 11 287 C1 ist es zudem bekannt, daß sich durch eine intensive, zweistufige Kühlung des die Warmwalzstaffel verlassenden Warmbandes bei Stählen der voranstehend angegebenen Art eine weitere Steigerung der Festigkeit erreichen läßt. Dazu ist in der ersten Kühlstufe eine mindestens 150 K/s betragende Abkühlrate erforderlich. In der Praxis zeigt sich jedoch, daß diese Maßnahme allein nicht ausreicht, um eine zielgerichtete Abstimmung von Festigkeiten und Verformbarkeit durchführen zu können.From DE 199 11 287 C1 it is also known that through an intensive, two-stage cooling of the Hot rolling mill leaving hot strip in steels of a further increase in the type indicated above Strength can be achieved. This is in the first Cooling stage a cooling rate of at least 150 K / s required. In practice, however, it turns out that this Measure alone is not enough to be targeted Coordination of strength and deformability to be able to perform.

Die Aufgabe der Erfindung bestand darin, ein kostengünstig durchführbares Verfahren zu schaffen, welches es ermöglicht die Eigenschaften von hochfestem, gut verformbarem Warmband auf den jeweiligen Verwendungszweck gezielt zu optimieren.The object of the invention was a to create cost-effective procedures, which enables the properties of high strength, well deformable hot strip on the respective To optimize the intended use.

Diese Aufgabe wird ausgehend von dem voranstehend erläuterten Stand der Technik durch ein Verfahren zum Herstellen vom Warmband mit einer mindestens 800 N/mm2 betragenden Zugfestigkeit gelöst, bei dem in einem kontinuierlichen Arbeitsablauf,

  • ein Stahl, welcher (in Gew.-%) 0,03 bis 0,10 % C, höchstens 0,8 % Si, 1,2 bis 2,0 % Mn, 0,02 bis 0,06 % Al, höchstens 0,5 % Cr, höchstens 0,2 % Ti, höchstens 0,08 % Nb, weniger als 0,005 % Ca, weniger als 0,05 % Cu, weniger als 0,05 % Ni, weniger als 0,02 % P, weniger als 0,005 % S, weniger als 0,01 % N und als Rest Eisen sowie unvermeidbare Verunreinigungen, enthält, zu einem Vormaterial, wie Dünnbrammen oder gegossenes Band, vergossen wird,
  • das Vormaterial bei einer oberhalb der Ar3-Temperatur liegenden Endtemperatur zu einem Warmband warmgewalzt wird,
  • das erhaltene Warmband in einem ersten Kühlabschnitt mit einer Abkühlgeschwindigkeit von mindestens 150 K/s auf eine 500 °C bis 700 °C betragende Zwischentemperatur abgekühlt wird, und
  • das Warmband nach einer drei bis zehn Sekunden dauernden Kühlpause in einem zweiten Kühlabschnitt auf eine Haspeltemperatur gekühlt wird, die nach folgender Maßgabe bestimmt wird (Eigenschaftsangaben jeweils ermittelt für die Bandbreitenmitte in Längsrichtung):
  • a) für Warmbänder mit einer mehr als 690 MPa betragenden Streckgrenze und einer unter 900 MPa liegenden Zugfestigkeit:
  • Haspeltemperatur größer als 580 °C,
  • b) für Warmbänder mit einer höchstens 690 MPa betragenden Streckgrenze und einer unter 900 MPa liegenden Zugfestigkeit:
  • Haspeltemperatur mindestens gleich 450 °C und höchstens gleich 580 °C,
  • c) für Warmbänder mit einer mehr als 900 MPa betragenden Zugfestigkeit:
  • Haspeltemperatur höchstens gleich 250 °C.
Starting from the prior art explained above, this object is achieved by a method for producing hot strip with a tensile strength of at least 800 N / mm 2 , in which, in a continuous workflow,
  • a steel which (in% by weight) 0.03 to 0.10% C, at most 0.8% Si, 1.2 to 2.0% Mn, 0.02 to 0.06% Al, at most 0 , 5% Cr, at most 0.2% Ti, at most 0.08% Nb, less than 0.005% Ca, less than 0.05% Cu, less than 0.05% Ni, less than 0.02% P, less contains 0.005% S, less than 0.01% N and the balance iron and unavoidable impurities, is cast into a starting material such as thin slabs or cast strip,
  • the primary material is hot rolled to a hot strip at a final temperature above the Ar 3 temperature,
  • the hot strip obtained is cooled in a first cooling section at a cooling rate of at least 150 K / s to an intermediate temperature of 500 ° C. to 700 ° C., and
  • After a cooling pause lasting three to ten seconds, the hot strip is cooled in a second cooling section to a reel temperature, which is determined according to the following stipulations (property information in each case determined for the strip width center in the longitudinal direction):
  • a) for hot strips with a yield strength of more than 690 MPa and a tensile strength below 900 MPa:
  • Reel temperature greater than 580 ° C,
  • b) for hot strips with a maximum yield strength of 690 MPa and a tensile strength below 900 MPa:
  • Reel temperature at least equal to 450 ° C and at most equal to 580 ° C,
  • c) for hot strips with a tensile strength of more than 900 MPa:
  • Reel temperature at most equal to 250 ° C.

Erfindungsgemäß wird ein Stahl verarbeitet, der niedrige, unter-peritektische Gehalte an Kohlenstoff besitzt. Als solcher läßt sich dieser Stahl auf einer Gießwalzanlage zu Dünnbrammen oder auf einer Bandgießanlage zu gegossenem Band vergießen. Das so erhaltene Vormaterial läßt sich auf direktem Wege zu Warmband mit geringen Dicken von beispielsweise 0,8 mm bis 4 mm walzen.According to the invention, a steel is processed that has low, has sub-peritectic levels of carbon. As such steel can be on a casting and rolling line to thin slabs or on a belt caster shed cast tape. The raw material thus obtained can be made directly to hot strip with low Roll thicknesses from 0.8 mm to 4 mm, for example.

Die aufgrund des niedrigen Kohlenstoffgehaltes ermöglichte gute Vergießbarkeit von erfindungsgemäß verwendetem Stahl ermöglicht es, ein kontinuierlich ablaufendes Herstellverfahren für die Warmbanderzeugung zu nutzen. Auf diese Weise läßt sich bei gegenüber der konventionellen Fertigungsweise wesentlich vereinfachtem Verfahrensablauf kostengünstig ein Warmband bereitstellen, daß schon beim Verlassen der Warmbandstraße eine Dicke besitzt, wie sie insbesondere im Automobilbau zur Herstellung von Strukturelementen der Karosserie benötigt wird, und das gleichzeitig so beschaffen ist, daß seine Eigenschaften nach Absolvierung einer geeigneten Abkühlung durch die Wahl einer bestimmten Haspeltemperatur für den jeweiligen Verwendungszweck optimiert werden können. Trotz des niedrigen Kohlenstoffgehaltes werden dabei Festigkeiten erreicht, wie sie sonst nur bei höher kohlenstoffhaltigen Stählen möglich sind.The due to the low carbon content Allows good pourability of the invention The steel used allows a continuous ongoing manufacturing process for hot strip production to use. In this way it can be compared to conventional manufacturing method much simplified Process flow inexpensive a hot strip provide that as soon as you leave the Hot strip mill has a thickness, as in particular in automotive engineering for the production of structural elements Body is needed, and at the same time is that its properties after graduation a suitable cooling by choosing one certain reel temperature for each Purpose can be optimized. Despite the low carbon content becomes strength achieved as otherwise only with higher carbon Steels are possible.

Das Warmwalzen wird erfindungsgemäß bei Temperaturen oberhalb der Ar3-Temperatur beendet, da sich hohe Warmwalzendtemperaturen günstig auf die Walzbarkeit und den Lösungszustand der Mikrolegierungselemente auswirken.Hot rolling is ended according to the invention at temperatures above the Ar 3 temperature, since high hot rolling end temperatures have a favorable effect on the rollability and the state of solution of the microalloying elements.

Im Anschluß an das Warmwalzen erfolgt erfindungsgemäß in an sich bekannter Weise eine intensive, zweistufig durchgeführte Abkühlung des Bandes. Durch diese Abkühlung wird ein perlitfreies, kohlenstoffarmes bainitisches Gefüge mit härtesteigernden Anteilen an Martensit und Restaustenit erhalten.Following hot rolling, the invention is carried out in an intensive, two-stage manner known per se performed cooling of the band. By this cooling becomes a pearlite-free, low-carbon bainitic Structure with hardness-increasing proportions of martensite and Preserved austenite.

Für das Ergebnis des erfindungsgemäßen Verfahrens wesentlich ist die Wahl der Haspeltemperatur, da erfindungsgemäß durch die Wahl der Haspeltemperatur die gezielte Einstellung der gewünschten Werkstoffeigenschaften erfolgt. In jedem Fall werden dabei Zugfestigkeiten von mindestens 800 MPa erreicht.For the result of the method according to the invention the choice of the reel temperature is essential since according to the invention by the choice of the reel temperature targeted setting of the desired Material properties takes place. In any case tensile strengths of at least 800 MPa are achieved.

Hohe Haspeltemperaturen von mindesten 580 °C führen zu einem Warmband, das ein hohes Streckgrenzverhältnis und damit einhergehend eine hohe Streckgrenze besitzt. Derartige Warmbänder eignen sich besonders für die Herstellung von schwach verformten Bauteilen, bei denen ein hohes Work-Hardening des Stahles aufgrund fehlender Verformung nicht nutzbar ist, bei denen aber trotzdem ein hohes Energieaufnahmevermögen im elastischen Bereich benötigt wird.High reel temperatures of at least 580 ° C lead to a hot strip that has a high yield ratio and associated with it has a high yield strength. Such hot strips are particularly suitable for Manufacture of weakly deformed components in which a high work hardening of the steel due to lack of Deformation is not usable, but in the case of a high energy absorption capacity in the elastic range is needed.

Wird das Warmband bei Temperaturen im Bereich von 450 °C bis 580 °C gehaspelt, so besitzt das erhaltene Warmband ein niedrigeres Streckgrenzverhältnis und damit eine niedrigere Streckgrenze. Gleichzeitig besitzen die so beschaffenen, erfindungsgemäß erzeugten Warmbänder jedoch ein hohes Verfestigungsvermögen schon bei geringer Verformung.The hot strip is used at temperatures in the range of 450 ° C coiled up to 580 ° C, the hot strip obtained has a lower yield strength ratio and therefore one lower yield strength. At the same time they own it procured hot strips produced according to the invention a high solidification capacity even at low Deformation.

Es hat sich gezeigt, daß alle Varianten, die im Temperaturbereich von 450 °C bis 650 °C gehaspelt werden, darüber hinaus ein außerordentlich günstiges Verhältnis von Festigkeit und Umformbarkeit aufweisen, wie es bisher nur von Restaustenitstählen bekannt ist. It has been shown that all variants in the Temperature range from 450 ° C to 650 ° C, moreover an extraordinarily favorable ratio of strength and formability, as was previously the case is only known from residual austenite steels.

Eine Steigerung der Festigkeit erfindungsgemäß erzeugter Warmbänder läßt sich durch Absenkung der Haspeltemperatur unter 250 °C, insbesondere unter 100 °C, erreichen. Bei derartig niedrigen Haspeltemperaturen wird ein Warmband erhalten, welches eine Mindestzugfestigkeit von 900 MPa bei einem niedrigen Streckgrenzenverhältnis besitzt. Es besitzt damit etwa das Eigenschaftsprofil eines Complexphasenstahls, wie er beispielsweise aus der WO98/40522 bekannt ist. Im Unterschied zu dem bekannten CP-Stahl weist erfindungsgemäßer Stahl jedoch einen deutlich geringeren Kohlenstoffgehalt und eine dementsprechend verbesserte Schweißbarkeit auf.An increase in strength produced according to the invention Hot strips can be made by lowering the reel temperature below 250 ° C, especially below 100 ° C. at such low reel temperatures becomes a hot strip obtained, which has a minimum tensile strength of 900 MPa with a low yield ratio. It thus has the property profile of a Complex phase steel, such as from the WO98 / 40522 is known. In contrast to the known one However, CP steel has one according to the invention significantly lower carbon content and a accordingly improved weldability.

Weiter optimierte Verarbeitungseigenschaften eines erfindungsgemäß erzeugten Warmbands lassen sich dadurch erhalten, daß der Stahl 0,05 Gew.-% bis 0,07 Gew.-% Kohlenstoff enthält. Ebenso kann es zweckmäßig sein, zur Erhöhung der Härte des Stahls einen Si-Gehalt von 0,3 Gew.-% bis 0,8 Gew.-%, insbesondere 0,5 Gew.-% bis 0,8 Gew.-% vorzusehen. Durch eine Kalziumbehandlung läßt sich die Sulfidform günstig beeinflussen.Further optimized processing properties of a Hot strips produced according to the invention can be thereby obtained that the steel 0.05 wt% to 0.07 wt% Contains carbon. It can also be useful to Increasing the hardness of the steel has a Si content of 0.3% by weight to 0.8% by weight, in particular 0.5% by weight to 0.8% by weight. By calcium treatment leaves influence the sulfide form favorably.

Erforderlichenfalls ist ein Ausgleichsofen vorzusehen, den das Vormaterial, bevor es warmgewalzt wird, durchläuft. In dem Ausgleichsofen sollte das Vormaterial auf eine oberhalb von 1050 °C liegende Temperatur erwärmt werden, um ausreichend hohe Gehalte an Mikrolegierungselementen in Lösung zu halten.If necessary, a compensating furnace must be provided, the primary material before it is hot rolled, passes. The primary material should be in the compensating furnace heated to a temperature above 1050 ° C be high enough Keep microalloying elements in solution.

Unabhängig von seinen jeweils gewählten Eigenschaften eignet sich erfindungsgemäß erzeugtes Warmband für eine Oberflächenveredelung, insbesondere für ein elektrolytisches Verzinken oder ein Feuerverzinken. Regardless of its chosen properties hot strip produced according to the invention is suitable for a Surface finishing, especially for a electrolytic galvanizing or hot-dip galvanizing.

Aufgrund seines Eigenschaftsprofils eignet sich erfindungsgemäß erzeugtes Warmband in besonderer Weise für die Herstellung von hochbeanspruchten Strukturelementen für den Fahrzeugkarosseriebau. Bei diesen Elementen kann es sich beispielsweise um Seitenaufprallträger, Stoßfänger, Verstärkungselemente, Rahmenstrukturen, Profile oder ähnliches handeln.Due to its property profile is suitable Hot strip produced according to the invention in a special way for the production of highly stressed Structural elements for vehicle body construction. at These elements can be, for example Side impact beams, bumpers, reinforcement elements, Act frame structures, profiles or similar.

Alle Bauteile können aus erfindungsgemäß erzeugtem Warmband durch Kaltumformung erzeugt werden, wobei sich insbesondere das Rollprofilieren für die Formgebung eignet. Eine zusätzliche Wärme- oder sonstige Vergütungsbehandlung zur Erhöhung der Festigkeit der erhaltenen Bauteile ist regelmäßig nicht erforderlich.All components can be produced from the invention Hot strip can be produced by cold forming, whereby especially roll profiling for shaping suitable. An additional heat or other Compensation treatment to increase the strength of the components obtained is not regularly required.

Erfindungsgemäß erzeugtes Warmband läßt sich darüber hinaus zu Kaltband walzen. Dabei eignet sich sowohl das erfindungsgemäß erzeugte Warmband als auch das daraus gewalzte Kaltband in besonderer Weise für eine Feuerverzinkung.Hot strip produced according to the invention can be over it roll out to cold strip. Both are suitable hot strip produced according to the invention and also the result thereof rolled cold strip in a special way for a Hot-dip galvanizing.

So hat sich gezeigt, daß insbesondere dann, wenn die Temperatur in der vor dem Durchlauf des Verzinkungsbades passierten Durchlaufglühe weniger als 800 °C beträgt, das fertig verzinkte Band Festigkeiten von mehr als 850 MPa aufweist. Wird beispielsweise ein Warmband mit besonders hoher Festigkeit erzeugt, indem es erfindungsgemäß bei einer Temperatur von weniger als 250 °C gehaspelt wird, so läßt sich aus diesem Warmband überraschenderweise ein verzinktes Band mit einer Festigkeit von mehr als 900 MPa erzeugen, wenn die Glühung vor dem Durchlauf des Zinkbades auf maximal 780 °C beschränkt wird. Dies gilt sowohl für erfindungsgemäß erzeugte Warm- als auch für daraus gewonnene Kaltbänder. It has been shown that especially when the Temperature in the pre-galvanizing bath passed continuous annealing is less than 800 ° C, that finished galvanized strip strengths of more than 850 MPa having. For example, a hot strip with special high strength produced by according to the invention at a temperature of less than 250 ° C, so surprisingly one can from this hot strip galvanized strip with a strength of more than 900 MPa generate if the glow before going through the Zinc bath is limited to a maximum of 780 ° C. this applies for both hot and generated according to the invention cold strips obtained therefrom.

Nachfolgend wird die Erfindung anhand von Ausführungsbeispielen näher erläutert.The invention is described below with reference to Embodiments explained in more detail.

Eine Stahlschmelze mit (in Gew.-%) 0,058 % C, 0,61 % Si, 1,72 % Mn, 0,015 % P, 0,001% S, 0,026 % Al, 0,0057 % N, 0,34 % Cr, 0,117 % Ti, 0,01 % Cu, 0,021 % Ni, 0,0028 % Ca, Rest Eisen und unvermeidbare Verunreinigungen ist in einer Gießwalzanlage zu einem Strang vergossen worden, von dem anschließend in einem kontinuierlichen Verfahrensablauf Dünnbrammen abgeteilt wurden. Ebenso unterbrechungsfrei haben die Dünnbrammen dann zur Homogenisierung ihrer Temperaturverteilung und ihrer Gefügestruktur einen mit einer oberhalb von 1050 °C liegenden Temperatur betriebenen Ausgleichsofen durchlaufen, bevor sie kontinuierlich in einer Warmwalzstaffel zu Warmbändern A1-A5, B1-B10 und C fertig warmgewalzt worden sind.A steel melt with (in% by weight) 0.058% C, 0.61% Si, 1.72% Mn, 0.015% P, 0.001% S, 0.026% Al, 0.0057% N, 0.34% Cr, 0.117% Ti, 0.01% Cu, 0.021% Ni, 0.0028% Ca, rest of iron and unavoidable impurities is in a casting and rolling system has been cast into one strand, from which subsequently in a continuous Process flow thin slabs were divided. As well The thin slabs then have uninterrupted Homogenization of their temperature distribution and their Structure structure one with a temperature above 1050 ° C lying temperature operated compensating furnace go through before continuously in one Hot rolling line for hot strips A1-A5, B1-B10 and C ready have been hot rolled.

Die die Warmwalzstaffel bei einer Warmwalzendtemperatur ET und einer Dicke D verlassenden Warmbänder A1-A5, B1-B10 und C sind in einer ersten Kühlstufe mit einer mindestens 150 K/s betragenden Abkühlgeschwindigkeit CR auf eine Zwischentemperatur ZT intensiv abgekühlt worden, auf der sie dann über eine mindestens drei und höchstens zehn Sekunden betragende Kühlpause ohne aktive Kühlung gehalten worden sind. In einer zweiten Kühlstufe sind die Warmbänder daraufhin von der Zwischentemperatur ZT an Luft oder unter Einwirkung einer Kühlflüssigkeit beschleunigt bis auf eine Haspeltemperatur HT abgekühlt worden.Die the hot rolling season at a hot rolling end temperature ET and a thickness D leaving hot strips A1-A5, B1-B10 and C are in a first cooling stage with a cooling rate CR of at least 150 K / s have been intensively cooled to an intermediate temperature ZT, on which they then have at least three and at most cooling break of ten seconds without active cooling have been held. In a second cooling stage they are Hot strips then from the intermediate temperature ZT Air or under the influence of a coolant accelerated cooled down to a reel temperature HT Service.

In Tabelle 1 sind für die Warmbänder A1-A5, B1-B10 und C jeweils die Endwalztemperatur ET, die Abkühlgeschwindigkeit CR, die Zwischentemperatur ZT, die Haspeltemperatur HT und die Dicke D angegeben. Warmband ET CR ZT HT D [°C] [K/s] [°C] [°C] [mm] A1 880 150 700 610 3,5 A2 880 168 690 605 3,5 A3 900 197 685 605 3,5 A4 900 192 690 610 3,5 A5 900 337 610 585 2,7 B1 900 361 600 565 2,5 B2 900 370 600 560 2,5 B3 900 405 600 555 2,25 B4 900 408 610 520 2,0 B5 900 435 600 545 1,95 B6 900 475 610 550 1,75 B7 900 460 610 560 1,65 B8 900 360 605 540 2,5 B9 900 326 610 540 2,5 B10 900 419 590 525 2,6 C 900 312 600 80 3,0 Table 1 shows the final rolling temperature ET, the cooling rate CR, the intermediate temperature ZT, the reel temperature HT and the thickness D for the hot strips A1-A5, B1-B10 and C. hot strip ET CR ZT HT D [° C] [K / s] [° C] [° C] [Mm] A1 880 150 700 610 3.5 A2 880 168 690 605 3.5 A3 900 197 685 605 3.5 A4 900 192 690 610 3.5 A5 900 337 610 585 2.7 B1 900 361 600 565 2.5 B2 900 370 600 560 2.5 B3 900 405 600 555 2.25 B4 900 408 610 520 2.0 B5 900 435 600 545 1.95 B6 900 475 610 550 1.75 B7 900 460 610 560 1.65 B8 900 360 605 540 2.5 B9 900 326 610 540 2.5 B10 900 419 590 525 2.6 C 900 312 600 80 3.0

Die im Zugversuch für die Bandbreitenmitte der fertig hergestellten Warmbänder A1-A5, B1-B10 und C in Längsrichtung jeweils bestimmte Streckgrenze Re bzw. Rp0,2, Zugfestigkeit Rm, Bruchdehnung A5, Gleichmaßdehnung Agl, die Streckgrenzdehnung ARe sowie, soweit ermittelt, der zugehörige n-Wert sind in Tabelle 2 angegeben.The tensile strength R e or R p0.2 , tensile strength R m , elongation at break A 5 , uniform elongation A gl , the yield strength elongation A Re as well as in the tensile test for the strip width center of the finished hot strips A1-A5, B1-B10 and C in the longitudinal direction If determined, the associated n-value is given in Table 2.

Es bestätigt sich, daß die bei hohen Haspeltemperaturen HT oberhalb von 580 °C gehaspelten Warmbänder A1-A5 bei zwischen 800 MPa und 900 MPa liegenden Zugfestigkeiten jeweils eine ausgeprägte Streckgrenze Re besitzen, die regelmäßig über 690 MPa, insbesondere über 740 MPa liegt. Sie verfügen dementsprechend über ein hohes Energieaufnahmevermögen im elastischen Bereich und eignen sich daher im besonderen Maße zur Herstellung von Bauelementen, die schon im unverformten Zustand bzw. bei geringer Verformung hohe Kräfte sicher aufnehmen können sollen. Warmband Re Rp0,2 Rm A5 Ag1 ARe n-Wert [MPa] [%] A1 748 811 20,3 11,8 2,9 0,125 A2 787 845 20,7 12,6 2,9 0,113 A3 759 829 20,7 11,8 2,4 0,113 A4 752 829 21,5 11,7 2,4 - A5 773 862 20,6 11,4 2,0 0,103 B1 653 854 18,7 10,6 0 - B2 663 811 15,1 8,9 0 - B3 669 864 16,9 9,5 0 - B4 674 825 16,1 9,3 0 - B5 617 826 12,8 7,9 0 - B6 630 824 17,3 9,5 0 - B7 648 847 18,0 10,3 0 - B8 610 840 17,6 9,8 0 - B9 612 834 17,5 9,4 0 - B10 598 804 17,4 9,8 0 - C 682 956 12,0 6,0 0 - It is confirmed that the hot strips A1-A5 coiled at high reel temperatures HT above 580 ° C. each have a pronounced yield strength R e at tensile strengths between 800 MPa and 900 MPa, which is regularly above 690 MPa, in particular above 740 MPa. Accordingly, they have a high energy absorption capacity in the elastic range and are therefore particularly suitable for the production of components that should be able to safely absorb high forces even in the undeformed state or with little deformation. hot strip re R p0.2 R m A 5 A g1 A Re n-value [MPa] [%] A1 748 811 20.3 11.8 2.9 0,125 A2 787 845 20.7 12.6 2.9 0.113 A3 759 829 20.7 11.8 2.4 0.113 A4 752 829 21.5 11.7 2.4 - A5 773 862 20.6 11.4 2.0 0.103 B1 653 854 18.7 10.6 0 - B2 663 811 15.1 8.9 0 - B3 669 864 16.9 9.5 0 - B4 674 825 16.1 9.3 0 - B5 617 826 12.8 7.9 0 - B6 630 824 17.3 9.5 0 - B7 648 847 18.0 10.3 0 - B8 610 840 17.6 9.8 0 - B9 612 834 17.5 9.4 0 - B10 598 804 17.4 9.8 0 - C 682 956 12.0 6.0 0 -

Die im mittleren Haspeltemperaturbereich von 450 °C bis 580 °C gehaspelten Warmbänder B1-B10 erreichen ebenso regelmäßig Zugfestigkeiten, die oberhalb von 800 MPa und unterhalb von 900 MPa liegen. Gleichzeitig weisen die Warmbänder B1-B10 einen kontinuierlichen Übergang von der elastischen zur plastischen Verformung auf, für den eine Streckgrenze Rp0,2 von weniger als 690 MPa und ein dementsprechend gegenüber den Warmbändern A1-A5 niedrigeres Streckgrenzverhältnis Rp0,2/Rm ermittelt worden ist. Die Warmbänder B1-B10 lassen sich daher besonders gut zu Bauteilen kaltumformen, die ein hohes Verfestigungsvermögen schon bei geringer Verformung besitzen müssen. The hot strips B1-B10 coiled in the middle reel temperature range from 450 ° C to 580 ° C also regularly achieve tensile strengths that are above 800 MPa and below 900 MPa. At the same time, the hot strips B1-B10 have a continuous transition from elastic to plastic deformation, for which a yield strength R p0.2 of less than 690 MPa and a lower yield strength ratio R p0.2 / R m are determined compared to the hot strips A1-A5 has been. The hot strips B1-B10 can therefore be cold-formed particularly well into components that must have a high level of hardening capacity even with little deformation.

Das bei einer besonders niedrigen Haspeltemperatur gehaspelte Warmband C belegt schließlich, daß sich durch die Wahl von unter 250 °C liegenden Haspeltemperaturen besonders hochfeste Warmbänder erzeugen lassen. Aufgrund seines niedrigen Kohlenstoffgehaltes und seiner gleichzeitig besonders hohen Festigkeit läßt sich ein solches Warmband hervorragend für die Fertigung von Schweißkonstruktionen oder anderen tragenden Strukturelementen verwenden, die in der Lage sein müssen, schon bei einer geringen bzw. ohne eine Verformung hohe Lasten sicher aufnehmen zu können.This at a particularly low reel temperature coiled hot strip C finally proves that through the choice of reel temperatures below 250 ° C have particularly high-strength hot strips produced. by virtue of its low carbon content and its at the same time, particularly high strength can be achieved such hot strip excellent for the production of Welded structures or other load-bearing Use structural elements that must be able to even with a small or high without a deformation To be able to take loads safely.

Zum Nachweis des Einflusses der erfindungsgemäß vorgegebenen Glühtemperatur beim Feuerverzinken Warmbändern der hier in Rede stehenden Art sind zusätzlich Warmbänder B11,B12 erzeugt worden. Die bei ihrer Herstellung jeweils eingestellte Warmbandendtemperatur ET (900 °C), Abkühlgeschwindigkeit CR und Zwischentemperatur ZT (600 °C) war dabei vergleichbar mit den bei der Erzeugung der Warmbänder B1 bis B10 eingestellten Parameter. Die Haspeltemperatur HT bei der Herstellung des Warmbands B11 betrug 510 °C, während sie bei der Herstellung des Warmbands B12 auf 530 °C eingestellt war. Die Warmbändern B11,B12 sind anschließend feuerverzinkt worden. Ebenso ist das Warmband C e einer Feuerverzinkung unterzogen worden.To demonstrate the influence of the invention given annealing temperature during hot dip galvanizing Hot strips of the type in question are here additional hot strips B11, B12 have been produced. The at their manufacture set Hot strip end temperature ET (900 ° C), cooling rate CR and intermediate temperature ZT (600 ° C) was there comparable to that in the production of hot strips B1 parameters set up to B10. The reel temperature HT in the production of the hot strip B11 was 510 ° C, while on during the production of the hot strip B12 530 ° C was set. The hot bands B11, B12 are then hot-dip galvanized. It is the same Hot strip C e has been subjected to hot-dip galvanizing.

Bei der Feuerverzinkung haben die Warmbänder B11,B12,C jeweils einen Durchlaufglühofen durchlaufen, bevor sie in das Verzinkungsbad eingetreten sind. Im Diagramm 1 sind für im Durchlaufglühofen eingestellte Glühtemperaturen von 740 °C, 760 °C, 780 °C, 800 °C, 820 °C und 840 °C die Zugfestigkeiten Rm, im Diagramm 2 für dieselben Glühtemperaturen die Streckgrenze Re, im Diagramm 3 für dieselben Glühtemperaturen die Bruchdehnung A80 und im Diagramm 4 für dieselben Glühtemperaturen die Gleichmaßdehnung Agl aufgetragen.In hot-dip galvanizing, hot strips B11, B12, C each had to pass through a continuous annealing furnace before they entered the galvanizing bath. Diagram 1 shows the tensile strengths R m for annealing temperatures of 740 ° C, 760 ° C, 780 ° C, 800 ° C, 820 ° C and 840 ° C set in the continuous annealing furnace, and the yield point R e , im for the same annealing temperatures Diagram 3 shows the elongation at break A 80 for the same annealing temperatures and the uniform elongation A gl in diagram 4 for the same annealing temperatures.

Es zeigt sich, daß Warmbänder B11,B12 bei Glühtemperaturen, die weniger als 800 °C betragen, regelmäßig besonders hohe Festigkeiten Rm von mindestens 880 MPa besitzen. Wird das Warmband C bei Glühtemperaturen von weniger als 800 °C geglüht, so liegen die erreichten Festigkeiten Rm bei mindestens 900 MPa.It can be seen that hot strips B11, B12 regularly have particularly high strengths R m of at least 880 MPa at annealing temperatures which are less than 800 ° C. If the hot strip C is annealed at annealing temperatures of less than 800 ° C, the strengths R m achieved are at least 900 MPa.

Bei Glühtemperaturen von ≤ 780 °C liegt die Streckgrenze Re der verzinkten Warmbänder B11,B12,C mindestens auf dem Niveau der Warmbänder B11,B12 und C.At annealing temperatures of ≤ 780 ° C the yield strength R e of the galvanized hot strips B11, B12, C is at least at the level of the hot strips B11, B12 and C.

Das Niveau der Gleichmaßdehnung Agl und die Bruchdehnung A80 der verzinkten Warmbänder B11,B12 und C liegt für jede der Glühtemperaturen jeweils oberhalb des Niveaus der Warmbänder B11,B12,C, aus denen sie kaltgewalzt worden sind.The level of uniform elongation A gl and the elongation at break A80 of the galvanized hot strips B11, B12 and C is above the level of the hot strips B11, B12, C from which they were cold-rolled for each of the annealing temperatures.

Anhand der voranstehend erläuterten Beispiele ist nachgewiesen, daß sich das Gefüge und damit das Streckgrenzenverhältnis bei erfindungsgemäß erzeugtem Warmband durch die im Verzinkungsvorgang eingehaltene Temperaturführung gezielt variieren läßt. Ähnlich Eigenschaften werden auch dann erzielt, wenn man Warmband kaltwalzt und anschließend feuerverzinkt.Using the examples explained above demonstrated that the structure and thus the Yield point ratio in the case of the one produced according to the invention Hot strip through the one adhered to in the galvanizing process Temperature control can specifically vary. Similar Properties are also achieved when using hot strip cold rolled and then hot-dip galvanized.

Claims (12)

Verfahren zum Herstellen von Warmband mit einer mindestens 800 N/mm2 betragenden Zugfestigkeit, bei dem in einem kontinuierlichen Arbeitsablauf, ein Stahl, welcher (in Gew.-%) C: 0,03 - 0,10 %, Si: ≤ 0,8 %, Mn: 1,2 - 2,0 %, Al: 0,02 - 0,06 %, Cr: ≤ 0,5 %, Ti: ≤ 0,2 %, Nb: ≤ 0,08 %, Ca: < 0,005 %, Cu: < 0,05 %, Ni: < 0,05 %, P: < 0,02 %, S: < 0,005 %, N: < 0,01 %, und als Rest Eisen sowie unvermeidbare Verunreinigungen, enthält, zu einem Vormaterial, wie Dünnbrammen oder gegossenes Band, vergossen wird, das Vormaterial bei einer oberhalb der Ar3-Temperatur liegenden Endtemperatur zu einem Warmband warmgewalzt wird, das erhaltene Warmband in einem ersten Kühlabschnitt mit einer Abkühlgeschwindigkeit von mindestens 150 K/s auf eine 500 °C bis 700 °C betragende Zwischentemperatur abgekühlt wird, und das Warmband nach einer drei bis zehn Sekunden dauernden Kühlpause in einem zweiten Kühlabschnitt auf eine Haspeltemperatur gekühlt wird, die nach folgender Maßgabe bestimmt wird: a) für Warmbänder mit einer mehr als 690 MPa betragenden Streckgrenze und einer unter 900 MPa liegenden Zugfestigkeit: Haspeltemperatur > 580 °C b) für Warmbänder mit einer höchstens 690 MPa betragenden Streckgrenze und einer unter 900 MPa liegenden Zugfestigkeit: 450 °C ≤ Haspeltemperatur ≤ 580 °C c) für Warmbänder mit einer mehr als 900 MPa betragenden Zugfestigkeit: Haspeltemperatur ≤ 250 °C. Process for producing hot strip with a tensile strength of at least 800 N / mm 2 , in which in a continuous workflow, a steel which (in% by weight) C: 0.03-0.10%, Si: ≤ 0.8%, Mn: 1.2 - 2.0%, Al: 0.02 - 0.06%, Cr: ≤ 0.5%, Ti: ≤ 0.2%, Nb: ≤ 0.08%, Ca: <0.005%, Cu: <0.05%, Ni: <0.05%, P: <0.02%, S: <0.005%, N: <0.01%, and the remainder contains iron and unavoidable impurities, is cast into a starting material such as thin slabs or cast strip, the primary material is hot-rolled to a hot strip at a final temperature above the Ar 3 temperature, the hot strip obtained is cooled in a first cooling section at a cooling rate of at least 150 K / s to an intermediate temperature of 500 ° C. to 700 ° C., and After a cooling pause lasting three to ten seconds, the hot strip is cooled in a second cooling section to a reel temperature which is determined according to the following: a) for hot strips with a yield strength of more than 690 MPa and a tensile strength below 900 MPa: Reel temperature> 580 ° C b) for hot strips with a maximum yield strength of 690 MPa and a tensile strength below 900 MPa: 450 ° C ≤ reel temperature ≤ 580 ° C c) for hot strips with a tensile strength of more than 900 MPa: Reel temperature ≤ 250 ° C. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, d a ß der Stahl 0,05 Gew.-% bis 0,07 Gew.-% Kohlenstoff enthält. Method according to one of the preceding claims, characterized in that the steel contains 0.05% by weight to 0.07% by weight of carbon. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Stahl 0,3 Gew.-% bis 0,8 Gew.-% Silizium enthält.A method according to claim 1, characterized in that the steel contains 0.3 wt .-% to 0.8 wt .-% silicon. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, d a ß der Stahl mehr als 0,4 Gew.-%, insbesondere mindestens 0,5 Gew.-% Silizium enthält.Method according to one of the preceding claims, characterized in that the steel contains more than 0.4% by weight, in particular at least 0.5% by weight, of silicon. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, d a ß das Vormaterial, bevor es warmgewalzt wird, einen Ausgleichsofen durchläuft, in dem es auf eine oberhalb von 1050 °C liegende Temperatur erwärmt wird.Method according to one of the preceding claims, characterized in that ß the preliminary material, before it is hot rolled, passes through a compensating furnace in which it is heated to a temperature above 1050 ° C. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, d a ß die Haspeltemperatur weniger als 100 °C beträgt.Method according to one of the preceding claims, characterized in that the reel temperature is less than 100 ° C. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, d a ß das Warmband einer Oberflächenveredelung, insbesondere einer elektrolytischen Verzinkung oder einer Feuerverzinkung unterzogen wird.Method according to one of the preceding claims, characterized in that the hot strip is subjected to surface finishing, in particular electrolytic galvanizing or hot-dip galvanizing. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, d a ß das Warmband durch Rollprofilieren zu einem Bauelement kaltverformt wird. Method according to one of the preceding claims, characterized in that the hot strip is cold-formed by roll profiling to form a component. Verfahren nach Anspruch 1 bis 6, dadurch gekennzeichnet, daß das Warmband zu Kaltband kaltgewalzt wird.Method according to claims 1 to 6, characterized in that the hot strip is cold rolled into cold strip. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß das Kaltband einer Feuerverzinkung unterzogen wird.Method according to claim 9, characterized in that the cold strip is subjected to hot-dip galvanizing. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Zugfestigkeit des verzinkten Kaltbands mindestens 850 MPa beträgt.A method according to claim 10, characterized in that the tensile strength of the galvanized cold strip is at least 850 MPa. Verwendung eines Warmbands, welches nach einem gemäß einem der Ansprüche 1 bis 8 ausgebildeten Verfahren hergestellt ist, zur Herstellung von Strukturelementen für Fahrzeugkarosserien.Use of a hot band, which according to a one of claims 1 to 8 trained method is manufactured for the production of Structural elements for vehicle bodies.
EP02025150A 2001-12-13 2002-11-09 Hot strip manufacturing process Expired - Lifetime EP1319725B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10161465 2001-12-13
DE10161465A DE10161465C1 (en) 2001-12-13 2001-12-13 Production of hot strip used in vehicle chassis comprises casting steel into pre-material, hot rolling to form hot strip, cooling in first cooling step, and cooling in second cooling step after pause to coiling temperature

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EP1577412A1 (en) † 2002-12-24 2005-09-21 Nippon Steel Corporation High strength steel sheet exhibiting good burring workability and excellent resistance to softening in heat-affected zone and method for production thereof
EP1918406A1 (en) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Process for manufacturing steel flat products from boron microalloyed multi phase steel
WO2010130871A1 (en) 2009-05-11 2010-11-18 Rautaruukki Oyj Method for manufacturing hot rolled steel strip product, and hot rolled steel strip product
WO2011048274A1 (en) * 2009-10-23 2011-04-28 Rautaruukki Oyj Method for producing high-strength steel product and steel product
WO2012127125A1 (en) * 2011-03-24 2012-09-27 Arcelormittal Investigatión Y Desarrollo Sl Hot-rolled steel sheet and associated production method
KR20150038499A (en) * 2012-07-30 2015-04-08 타타 스틸 네덜란드 테크날러지 베.뷔. Method for producing steel strip of carbon steel
CN113481436A (en) * 2021-06-29 2021-10-08 鞍钢股份有限公司 800 MPa-grade hot-rolled complex phase steel and production method thereof
US11225697B2 (en) 2014-12-19 2022-01-18 Nucor Corporation Hot rolled light-gauge martensitic steel sheet and method for making the same

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DE102012013113A1 (en) * 2012-06-22 2013-12-24 Salzgitter Flachstahl Gmbh High strength multiphase steel and method of making a strip of this steel having a minimum tensile strength of 580 MPa
EP3164516B1 (en) 2014-07-03 2019-04-24 ArcelorMittal Method for producing an ultra high strength coated or not coated steel sheet and obtained sheet
ES2774091T3 (en) 2015-12-29 2020-07-16 Arcelormittal Procedure to produce an ultra high strength galvanized and annealed steel sheet and obtained galvanized and annealed sheet
DE102017209982A1 (en) * 2017-06-13 2018-12-13 Thyssenkrupp Ag High strength steel sheet with improved formability
DE102020203564A1 (en) * 2020-03-19 2021-09-23 Sms Group Gmbh Process for producing a rolled multiphase steel strip with special properties

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DE19911287C1 (en) * 1999-03-13 2000-08-31 Thyssenkrupp Stahl Ag Process for producing a hot strip
EP1143022A1 (en) * 1999-09-16 2001-10-10 Nkk Corporation Steel thin plate having high strength and method for production thereof
EP1149925A1 (en) * 1999-09-29 2001-10-31 Nkk Corporation Sheet steel and method for producing sheet steel
JP2001152254A (en) * 1999-11-30 2001-06-05 Kawasaki Steel Corp Method for producing highly workable hot rolled high tensile steel sheet excellent in material uniformity

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Cited By (23)

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Publication number Priority date Publication date Assignee Title
EP1577412A1 (en) † 2002-12-24 2005-09-21 Nippon Steel Corporation High strength steel sheet exhibiting good burring workability and excellent resistance to softening in heat-affected zone and method for production thereof
EP1577412B2 (en) † 2002-12-24 2014-11-12 Nippon Steel & Sumitomo Metal Corporation High strength steel sheet exhibiting good burring workability and excellent resistance to softening in heat-affected zone and method for production thereof
EP1918406A1 (en) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Process for manufacturing steel flat products from boron microalloyed multi phase steel
WO2008052919A1 (en) * 2006-10-30 2008-05-08 Thyssenkrupp Steel Ag Method for manufacturing flat steel products from a multiphase steel microalloyed with boron
JP2010508435A (en) * 2006-10-30 2010-03-18 ティッセンクルップ スチール アクチェンゲゼルシャフト Process for producing flat steel products from boron microalloyed multiphase steels
CN101528970B (en) * 2006-10-30 2012-10-03 蒂森克虏伯钢铁股份公司 Method for manufacturing flat steel products from a multiphase steel microalloyed with boron
WO2010130871A1 (en) 2009-05-11 2010-11-18 Rautaruukki Oyj Method for manufacturing hot rolled steel strip product, and hot rolled steel strip product
WO2011048274A1 (en) * 2009-10-23 2011-04-28 Rautaruukki Oyj Method for producing high-strength steel product and steel product
EP2491157A1 (en) * 2009-10-23 2012-08-29 Rautaruukki OYJ Method for producing high-strength steel product and steel product
EP2491157A4 (en) * 2009-10-23 2014-08-20 Rautaruukki Oyj Method for producing high-strength steel product and steel product
CN103534365A (en) * 2011-03-24 2014-01-22 安赛乐米塔尔研究与发展有限责任公司 Hot-rolled steel sheet and associated production method
JP2014514443A (en) * 2011-03-24 2014-06-19 アルセロルミタル・インベステイガシオン・イ・デサロジヨ・エセ・エレ Hot rolled steel sheet and related manufacturing method
WO2012127136A3 (en) * 2011-03-24 2012-11-15 Arcelormittal Investigación Y Desarrollo Sl Hot-rolled steel sheet and associated production method
US20140230970A1 (en) * 2011-03-24 2014-08-21 Arcelormittal Investigacion Y Desarroll Sl Hot-rolled steel sheet and associated production method
WO2012127125A1 (en) * 2011-03-24 2012-09-27 Arcelormittal Investigatión Y Desarrollo Sl Hot-rolled steel sheet and associated production method
CN103534365B (en) * 2011-03-24 2015-04-15 安赛乐米塔尔研究与发展有限责任公司 Hot-rolled steel sheet and associated production method
RU2551727C2 (en) * 2011-03-24 2015-05-27 Арселормитталь Инвестигасьон И Десарролло Сл Hot-rolled steel sheet and method of its production
JP2016047963A (en) * 2011-03-24 2016-04-07 アルセロルミタル・インベステイガシオン・イ・デサロジヨ・エセ・エレ Hot rolled steel sheet and related manufacturing method
US9540719B2 (en) 2011-03-24 2017-01-10 Arcelormittal Investigacion Y Desarrollo Sl Hot-rolled steel sheet and associated production method
KR20150038499A (en) * 2012-07-30 2015-04-08 타타 스틸 네덜란드 테크날러지 베.뷔. Method for producing steel strip of carbon steel
EP2880188B1 (en) 2012-07-30 2016-07-27 Tata Steel Nederland Technology B.V. Method for producing steel strip of carbon steel
US11225697B2 (en) 2014-12-19 2022-01-18 Nucor Corporation Hot rolled light-gauge martensitic steel sheet and method for making the same
CN113481436A (en) * 2021-06-29 2021-10-08 鞍钢股份有限公司 800 MPa-grade hot-rolled complex phase steel and production method thereof

Also Published As

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ATE280248T1 (en) 2004-11-15
EP1319725B1 (en) 2004-10-20
ES2231638T3 (en) 2005-05-16
DE10161465C1 (en) 2003-02-13
EP1319725A3 (en) 2003-12-10
DE50201348D1 (en) 2004-11-25

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