EP0910675B1 - Hot-rolled steel strip and method of making it - Google Patents

Hot-rolled steel strip and method of making it Download PDF

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Publication number
EP0910675B1
EP0910675B1 EP97931775A EP97931775A EP0910675B1 EP 0910675 B1 EP0910675 B1 EP 0910675B1 EP 97931775 A EP97931775 A EP 97931775A EP 97931775 A EP97931775 A EP 97931775A EP 0910675 B1 EP0910675 B1 EP 0910675B1
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Prior art keywords
hot
less
rolled strip
steel
temperature
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EP97931775A
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German (de)
French (fr)
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EP0910675A1 (en
Inventor
Manfred Espenhahn
Thomas Heller
Jürgen Esdohr
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Stahl AG
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    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the invention relates to a hot strip which is at most 5 mm thick made of high strength steel and a process for its Production.
  • Hot strip means hot rolled Tape.
  • hot strip is only manufactured up to strengths of around 800 N / mm 2 . These are thermomechanically rolled micro-alloyed steels. For applications that require additional strengths, soft hot strip is used and the strength required on the component is set by a subsequent heat treatment. For the thickness range below 2.0 mm, additional cold rolling is usually required to set the desired thickness. The required strength is also set in this case by a suitable heat treatment.
  • From GB 2 195 658 A1 are forgings from one Steel with 0.01 to 0.20% C, up to 1.0% Si, 0.5 to 2.25% Mn, up to 1.5% Cr, up to 0.05% Ti, up to 0.10% Nb, 0.005 to 0.015% N and up to 0.06% A1 are known.
  • the cooling of the Steel from the austenite area is to be controlled that the structure is fully martensitic. Be revealed however only examples with carbon contents below 0.10% and silicon contents over 0.17%. The Sulfur contents are relatively high at over 0.01%.
  • the hot strip has after a broken cooling a dual-phase structure made of polygonal ferrite and one Mixture of pearlite and bainite.
  • the hot strip known from DE 30 07 560 A1 is also used after hot rolling at a cooling rate cooled from 1 K / s or faster to a dual phase structure to produce from ferrite and martensite.
  • a cooling rate cooled from 1 K / s or faster to a dual phase structure to produce from ferrite and martensite.
  • Respect for satisfactory ductility and Weldability properties are carbon content in the Range of 0.02 to 0.09% recommended.
  • the preferred Silicon content is relatively high at 1.0%.
  • EP 0 492 623 A1 describes a steel made from a silicon-calmed steel Hot strip known, the Si contents of 0.1 wt .-% and more and has a martensite content of 60 - 100%.
  • the known Hot strip is used for the production of welded steel pipe without that special emphasis is placed on a good surface quality becomes. Lowering the Si content below a lower limit of 0.03 % By weight is advised against on the grounds that lower ones Si content no longer has the properties of the known hot strip let achieve.
  • the invention has for its object to produce a hot strip with tensile strength values over 800 N / mm 2 and at the same time good cold formability in the thickness range ⁇ 5 mm. This would mean an expansion of the direct use of hot strip for cold forming purposes, such as cold pressing, with clear economic advantages that result from the elimination of cold rolling and heat treatment.
  • Carbon can preferably be from 0.08 to 0.15%, manganese from 1.75 to 1.90%, chromium from 0.5 to 0.6% and Nitrogen from 0.005 to 0.009% may be included.
  • the tensile strength of the hot strip is preferably set to a value in the range from 800 to 1400 N / mm 2 by appropriate selection of the reel temperature within the aforementioned temperature range.
  • the hot strip can be hot-dip galvanized to to become more corrosion resistant.
  • Well cold-formable high-strength galvanized sheets are preferred for mechanically highly stressed components in automotive engineering used, e.g. for side impact beams and bumpers.
  • the steel according to the invention achieves high strength without expensive alloying elements and without annealing like this is the case with known steels.
  • a steel with 0.15% C, 0.01% Si, 1.77% Mn, 0.014% P, 0.003% S, 0.028% Al, 0.0043% N, 0.526% Cr, 0.017% Cu, 0.003% Mo, 0.027% Ni, balance Fe became to shed a slab.
  • the slab was reduced to approx. 1250 ° C warmed up, at approx. Pre-rolled at 1120 ° C and at 840 ° C Final temperature rolled to a final thickness of 2 mm, then cooled and coiled at 50 ° C. This creates a Structure with more than 95% martensite.
  • the yield strength reached values of 1120 N / mm 2 and the tensile strength values of 1350 N / mm 2 with elongation values A 50 to 11.1%.
  • Example 2 A steel with the same analysis as in Example 1 was processed into 3.5 mm thick hot strip. The data are given in Table 1. The strength values are significantly higher when reeling instead of over 400 ° C to 95 ° C. sample Final rolling temperature ° C Reel temperature ° C Rp0.2 N / mm 2 rm N / mm 2 1 845 95 940 1243 2 845 95 997 1305 3 845 95 983 1199 4 * 850 420 742 803 5 * 850 420 691 793 6 * 850 420 641 741 7 845 95 916 1089 8th 845 95 1037 1293 9 845 95 1073 1328 10 * 835 455 672 768 11 * 835 455 643 760 12 * 835 455 676 778
  • the hot strip can be hot-dip galvanized into the final shape before cold forming. Through the heat treatment cycle at. The martensite is left galvanized. Starting from a hot strip with tensile strengths in the range of 1200 - 1400 N / mm 2 , depending on the heat treatment cycle, tensile strengths between 800 and 1100 N / mm 2 are established during galvanizing.
  • a 2.0 and 1.6 mm thick hot strip was galvanized.
  • the following table 2 compares the properties in the rolled state and after galvanizing: rolled condition after galvanizing thickness re rm A80 re rm A80 mm N / mm 2 % N / mm 2 % 1.6 1052 1393 5.7 1065 1095 7 1.6 1048 1387 7.6 1040 1082 5.5 2.0 1098 1361 6.6 1058 1082 5.9

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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)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention concerns hot-rolled steel strip no more than 5 mm thick, optionally less than 2 mm thick, made of high-tensile steel, that contains 0.08%-0.25% carbon, 1.20% to 2.0% manganese, and 0.02% to 0.05% aluminum, and optionally up to 1.0% chromium, up to 0.1% copper, up to 0.5% molybdenum, up to 0.1% nickel, up to 0.009% nitrogen, up to 0.0025% B, and optionally a stoichiometric amount of titanium in relation to nitrogen. The steel strip has a greater than 95% martensitic structure, and a tensile strength of 800 to 1400 N/mm2.

Description

Die Erfindung betrifft ein höchstens 5 mm dickes Warmband aus Stahl hoher Festigkeit und ein Verfahren zu seiner Herstellung. Unter "Warmband" versteht man warmgewalztes Band.The invention relates to a hot strip which is at most 5 mm thick made of high strength steel and a process for its Production. "Hot strip" means hot rolled Tape.

Nach heutigem Stand der Technik wird Warmband nur bis zu Festigkeiten von etwa 800 N/mm2 hergestellt. Dabei handelt es sich um thermomechanisch gewalzte mikrolegierte Stähle. Bei Anwendungen, die darüber hinausgehende Festigkeiten erfordern, setzt man weiches Warmband ein und stellt die am Bauteil erforderliche Festigkeit durch eine anschließende Wärmebehandlung ein. Für den Dickenbereich unter 2,0 mm ist üblicherweise ein zusätzliches Kaltwalzen erforderlich, um die gewünschte Dicke einzustellen. Die erforderliche Festigkeit wird auch in diesem Fall durch eine geeignete Wärmebehandlung eingestellt.According to the current state of the art, hot strip is only manufactured up to strengths of around 800 N / mm 2 . These are thermomechanically rolled micro-alloyed steels. For applications that require additional strengths, soft hot strip is used and the strength required on the component is set by a subsequent heat treatment. For the thickness range below 2.0 mm, additional cold rolling is usually required to set the desired thickness. The required strength is also set in this case by a suitable heat treatment.

Aus der US 4 406 713 ist ein hochfester und hochzäher Stahl mit guter Bearbeitbarkeit bekannt, der 0,005 bis 0,3 % C, 0,3 bis 2,5 % Mn, bis 1,5 % Si und wenigstens einen Karbid- und Nitridbildner aus der Gruppe Nb, V, Ti und Zr in Mengen von bis 0,1 %, bis 0,15 %, bis 0,3 % und 0,3 % jeweils enthält. Dieser Stahl wird nach dem Austenitisieren derart abgeschreckt, daß er 5 bis 65 % Ferrit, Rest Martensit enthält. Gedacht ist insbesondere an die Herstellung von Drähten und Stäben. From US 4 406 713 is a high strength and tough Known steel with good machinability, the 0.005 to 0.3% C, 0.3 to 2.5% Mn, up to 1.5% Si and at least a carbide and nitride former from the group Nb, V, Ti and Zr in amounts of up to 0.1%, up to 0.15%, up to 0.3% and 0.3% each contains. This steel is made after Austenitized so that it is 5 to 65% Ferrite, rest contains martensite. It is thought in particular in the manufacture of wires and rods.

Aus der GB 2 195 658 A1 sind Schmiedeteile aus einem Stahl mit 0,01 bis 0,20 % C, bis 1,0 % Si, 0,5 bis 2,25 % Mn, bis 1,5 % Cr, bis 0,05 % Ti, bis 0,10 % Nb, 0,005 bis 0,015 % N und bis 0,06 % A1 bekannt. Die Abkühlung des Stahls aus dem Austenitgebiet soll so gesteuert werden, daß das Gefüge voll martensitisch ist. Offenbart werden allerdings nur Beispiele mit Kohlenstoffgehalten unter 0,10 % und Siliziumgehalten über 0,17%. Die Schwefelgehalte sind mit über 0,01 % relativ hoch.From GB 2 195 658 A1 are forgings from one Steel with 0.01 to 0.20% C, up to 1.0% Si, 0.5 to 2.25% Mn, up to 1.5% Cr, up to 0.05% Ti, up to 0.10% Nb, 0.005 to 0.015% N and up to 0.06% A1 are known. The cooling of the Steel from the austenite area is to be controlled that the structure is fully martensitic. Be revealed however only examples with carbon contents below 0.10% and silicon contents over 0.17%. The Sulfur contents are relatively high at over 0.01%.

Auch die aus der EP 0 072 867 A1 bekannten Stähle haben Kohlenstoffgehalte unter 0,10 % und Siliziumgehalte über 0,15 %. Das Warmband hat nach einer gebrochenen Abkühlung ein Dualphasen-Gefüge aus polygonalem Ferrit und einer Mischung aus Perlit und Bainit.Also have the steels known from EP 0 072 867 A1 Carbon levels below 0.10% and silicon levels above 0.15%. The hot strip has after a broken cooling a dual-phase structure made of polygonal ferrite and one Mixture of pearlite and bainite.

Auch das aus der DE 30 07 560 A1 bekannte Warmband wird nach dem Warmwalzen mit einer Abkühlungsgeschwindigkeit von 1 K/s oder schneller abgekühlt, um ein Dualphasen-Gefüge aus Ferrit und Martensit zu erzeugen. Mit Rücksicht auf befriedigende Duktilitäts- und Schweißbarkeitseigenschaften werden Kohlenstoffgehalte im Bereich von 0,02 bis 0,09 % empfohlen. Der bevorzugte Siliziumgehalt liegt mit 1,0 % relativ hoch. The hot strip known from DE 30 07 560 A1 is also used after hot rolling at a cooling rate cooled from 1 K / s or faster to a dual phase structure to produce from ferrite and martensite. With Respect for satisfactory ductility and Weldability properties are carbon content in the Range of 0.02 to 0.09% recommended. The preferred Silicon content is relatively high at 1.0%.

Aus der EP 0 492 623 A1 ist ein aus einem siliziumberuhigten Stahl erzeugtes Warmband bekannt, der jeweils Si-Gehalte von 0,1 Gew.-% und mehr aufweist und einen Martensitgehalt von 60 - 100 % besitzt. Das bekannte Warmband wird zur Herstellung von geschweißtem Stahlrohr genutzt, ohne dass dabei besonderen Wert auf eine gute Oberflächenbeschaffenheit gelegt wird. Von einer Absenkung der Si-Gehalte unter eine Untergrenze von 0,03 Gew.-% wird dabei mit der Begründung abgeraten, dass sich bei niedrigeren Si-Gehalten die Eigenschaften des bekannten Warmbands nicht mehr erreichen lassen.EP 0 492 623 A1 describes a steel made from a silicon-calmed steel Hot strip known, the Si contents of 0.1 wt .-% and more and has a martensite content of 60 - 100%. The known Hot strip is used for the production of welded steel pipe without that special emphasis is placed on a good surface quality becomes. Lowering the Si content below a lower limit of 0.03 % By weight is advised against on the grounds that lower ones Si content no longer has the properties of the known hot strip let achieve.

Schließlich ist aus der US 4,437,903 ein Stahl bekannt, dessen Kohlenstoffgehalt jeweils so eingestellt ist, dass sicher ein zweiphasiges Gefüge erreicht wird. Das Ziel dieser Maßnahme bestand dabei darin, ein Gefüge mit möglichst hohem Anteil an weichem Ferrit zu erhalten. Aus demselben Grund wird bei diesem Stand der Technik eine ausreichende Abkühlgeschwindigkeit vorgeschrieben, um die Koexistenz von Ferrit und Austenit zu gewährleisten.Finally, a steel is known from US 4,437,903, the Carbon content is set so that it is certainly a two-phase Structure is reached. The aim of this measure was to: To obtain structures with the highest possible proportion of soft ferrite. Out the same reason becomes sufficient in this prior art Cooling rate prescribed to the coexistence of ferrite and To ensure austenite.

Der Erfindung liegt die Aufgabe zugrunde, ein Warmband mit Zugfestigkeitswerten über 800 N/mm2 und gleichzeitig guter Kaltumformbarkeit im Dickenbereich ≤ 5 mm herzustellen. Dies würde eine Erweiterung des direkten Einsatzes von Warmband zu Kaltumformzwecken, wie Kaltpressen, mit deutlichen wirtschaftlichen Vorteilen, die sich aus dem Entfall des Kaltwalzens und einer Wärmebehandlung ergeben, bedeuten. The invention has for its object to produce a hot strip with tensile strength values over 800 N / mm 2 and at the same time good cold formability in the thickness range ≤ 5 mm. This would mean an expansion of the direct use of hot strip for cold forming purposes, such as cold pressing, with clear economic advantages that result from the elimination of cold rolling and heat treatment.

Zur Lösung dieser Aufgabe wird erfindungsgemäß ein Warmband mit einer Dicke unter 5 mm, insbesondere unter 2 mm, vorgeschlagen, das aus einem Stahl, der (in Masse-%)
   0,08 bis 0,25 % Kohlenstoff,
   1,20 bis 2,0 % Mangan,
   0,02 bis 0,05 % Aluminium,
   weniger als 0,04 % Silizium,
   sowie wahlweise eines oder mehrere der Elemente Chrom, Kupfer, Molybdän, Nickel, Stickstoff, Titan und Bor mit folgenden Gehalten
      bis 1,0 % Chrom,
      bis 0,1 % Kupfer,
      bis 0,5 % Molybdän,
      bis 0,1 % Nickel,
      bis 0,009 % Stickstoff,
      Titan in einer zur stöchiometrischen Abbindung des im Stahl vorhandenen Stickstoffs ausreichenden Menge (Ti = 3,4 % N), bis zu 0,0025 % B
   und als Rest Eisen und unvermeidbare Verunreinigungen, einschl. bis 0,015 % Phosphor und bis 0,003% Schwefel enthält, und ein martensitisches Gefüge mit weniger als 5 % insgesamt an anderen Gefügebestandteilen aufweist.To achieve this object, a hot strip with a thickness of less than 5 mm, in particular less than 2 mm, is proposed according to the invention, which is made of a steel which (in mass%)
0.08 to 0.25% carbon,
1.20 to 2.0% manganese,
0.02 to 0.05% aluminum,
less than 0.04% silicon,
and optionally one or more of the elements chromium, copper, molybdenum, nickel, nitrogen, titanium and boron with the following contents
up to 1.0% chromium,
up to 0.1% copper,
up to 0.5% molybdenum,
up to 0.1% nickel,
up to 0.009% nitrogen,
Titanium in an amount sufficient to stoichiometrically bind the nitrogen present in the steel (Ti = 3.4% N), up to 0.0025% B
and the balance contains iron and inevitable impurities, including up to 0.015% phosphorus and up to 0.003% sulfur, and has a martensitic structure with less than 5% total of other structural components.

Kohlenstoff kann bevorzugt von 0,08 bis 0,15 %, Mangan von 1,75 bis 1,90 %, Chrom von 0,5 bis 0,6 % und Stickstoff von 0,005 bis 0,009 % enthalten sein.Carbon can preferably be from 0.08 to 0.15%, manganese from 1.75 to 1.90%, chromium from 0.5 to 0.6% and Nitrogen from 0.005 to 0.009% may be included.

Titan kann in einer zur stöchiometrischen Abbindung (Ti = 3,4 % N) des im Stahl vorhandenen Sickstoffs ausreichenden Menge zugesetzt werden, um einen Zusatz von bis zu 0,0025 % B vor der Bindung an N zu schützen, damit es zur Festigkeitssteigerung und Durchhärtbarkeit beitragen kann. Titanium can be used for stoichiometric setting (Ti = 3.4% N) of the nitrogen present in the steel sufficient amount to be added to add to protect up to 0.0025% B from binding to N so it to increase strength and hardenability can contribute.

Durch die Begrenzung des Siliziumgehaltes auf unter 0,04 % wird eine Verbesserung der Oberflächenbeschaffenheit erreicht.By limiting the silicon content to below 0.04%, a Improvement in surface quality achieved.

Ein Verfahren zur Herstellung von Warmband einer Enddicke von weniger als 5 mm, insbesondere weniger als 2 mm, aus einem Stahl der beanspruchten Zusammensetzung mit Zugfestigkeitswerten über 800 N/mm2 umfaßt folgende Maßnahmen:

  • eine Bramme wird auf 1000 bis 1300°C erwärmt, im Temperaturbereich von 950 bis 1150°C vorgewalzt und bei einer Endwalztemperatur oberhalb Ar3 fertiggewalzt, das so erzeugte Warmband wird auf eine Haspeltemperatuim Bereich von 20 °C bis unterhalb der Martensitstarttemperatur zur Umwandlung in martensitisches Gefüge mit einem Gesamtgehalt anderer Gefügebestandteile von weniger als 5 % abgekühlt und gehaspelt.
    • A method for producing hot strip with a final thickness of less than 5 mm, in particular less than 2 mm, from a steel of the claimed composition with tensile strength values above 800 N / mm 2 comprises the following measures:
  • a slab is heated to 1000 to 1300 ° C, pre-rolled in the temperature range from 950 to 1150 ° C and finish-rolled at a final rolling temperature above Ar3, the hot strip thus produced is heated to a reel temperature in the range from 20 ° C to below the martensite start temperature for conversion into a martensitic structure cooled and coiled with a total content of other structural components of less than 5%.

    • Vorzugsweise soll die Abkühlung von Endwalztemperatur auf die Haspeltemperatur mit t 8/5 von kleiner 10 s erfolgen. (t 8/5 = Abkühlungszeit von 800 °C auf 500°C)Preferably, the cooling from the final rolling temperature should the reel temperature is less than 10 s with t 8/5. (t 8/5 = cooling time from 800 ° C to 500 ° C)

    Die Ar3-Temperatur kann durch folgende Gleichung abgeschätzt werden: Ar3=910-310x(%C)-33x(%Mn)-22x(%Cr)-17x(%Ni)-11x(%Si)-11x(%Mo) Die Martensitstart-Temperatur Ms kann durch folgende Gleichung abgeschätzt werden: Ms=500-300x(%C)-33x(%Mn)-22x(%Cr)-1,7x(%Ni)-11x(%Si)-11x(%Mo) The Ar3 temperature can be estimated using the following equation: Ar3 = 910-310x (% C) -33x (% Mn) -22x (% Cr) -17x (% Ni) -11x (% Si) -11x (% Mo) The martensite start temperature Ms can be estimated by the following equation: Ms = 500-300x (% C) -33x (% Mn) -22x (% Cr) -1,7x (% Ni) -11x (% Si) -11x (% Mo)

    Bevorzugt wird durch entsprechende Wahl der Haspeltemperatur innerhalb des vorerwähnten Temperaturbereichs die Zugfestigkeit des Warmbandes auf einen Wert im Bereich von 800 bis 1400 N/mm2 eingestellt.The tensile strength of the hot strip is preferably set to a value in the range from 800 to 1400 N / mm 2 by appropriate selection of the reel temperature within the aforementioned temperature range.

    Das Warmband kann feuerverzinkt werden, um korrosionsbeständiger zu werden. Gut kaltverformbare hochfeste verzinkte Bleche werden bevorzugt für mechanisch hochbelastete Bauteile im Automobilbau eingesetzt, z.B. für Seitenaufprallträger und Stoßfänger.The hot strip can be hot-dip galvanized to to become more corrosion resistant. Well cold-formable high-strength galvanized sheets are preferred for mechanically highly stressed components in automotive engineering used, e.g. for side impact beams and bumpers.

    Der erfindungsgemäße Stahl erreicht hohe Festigkeit ohne teure Legierungselemente und ohne Glühbehandlung wie dies bei bekannten Stählen der Fall ist.The steel according to the invention achieves high strength without expensive alloying elements and without annealing like this is the case with known steels.

    Anhand der folgenden Beispiele wird die Erfindung erläutert.The invention is illustrated by the following examples explained.

    Beispiel 1:Example 1:

    Ein Stahl mit 0,15 % C, 0,01 % Si, 1,77 % Mn, 0,014 % P, 0,003 % S, 0,028 % Al, 0,0043 % N, 0,526 % Cr, 0,017 % Cu, 0,003 % Mo, 0,027 % Ni, Rest Fe wurde zu einer Bramme vergossen. Die Bramme wurde auf rd. 1250 °C aufgewärmt, bei rd. 1120 °C vorgewalzt und mit 840°C Endtemperatur auf eine Enddicke von 2 mm gewalzt, danach abgekühlt und mit 50 °C gehaspelt. Dabei entsteht ein Gefüge mit mehr als 95 % Martensit.A steel with 0.15% C, 0.01% Si, 1.77% Mn, 0.014% P, 0.003% S, 0.028% Al, 0.0043% N, 0.526% Cr, 0.017% Cu, 0.003% Mo, 0.027% Ni, balance Fe became to shed a slab. The slab was reduced to approx. 1250 ° C warmed up, at approx. Pre-rolled at 1120 ° C and at 840 ° C Final temperature rolled to a final thickness of 2 mm, then cooled and coiled at 50 ° C. This creates a Structure with more than 95% martensite.

    Die Streckgrenze erreichte werte von 1120 N/mm2 und die Zugfestigkeit Werte von 1350 N/mm2 bei Dehnwerten A50 bis 11,1 %.The yield strength reached values of 1120 N / mm 2 and the tensile strength values of 1350 N / mm 2 with elongation values A 50 to 11.1%.

    Beispiel 2:Example 2:

    Ein Stahl mit derselben Analyse wie im Beispiel 1 wurde zu 3,5 mm dickem Warmband verarbeitet. Die Daten sind in Tabelle 1 mitgeteilt. Die Festigkeitswerte sind deutlich höher, wenn statt über 400°C bis 95°C gehaspelt wird. Probe Endwalztemperatur °C Haspeltemperatur °C Rp0,2
    N/mm2     Rm
    N/mm2     1 845 95 940 1243 2 845 95 997 1305 3 845 95 983 1199 4* 850 420 742 803 5* 850 420 691 793 6* 850 420 641 741 7 845 95 916 1089 8 845 95 1037 1293 9 845 95 1073 1328 10* 835 455 672 768 11* 835 455 643 760 12* 835 455 676 778     A steel with the same analysis as in Example 1 was processed into 3.5 mm thick hot strip. The data are given in Table 1. The strength values are significantly higher when reeling instead of over 400 ° C to 95 ° C. sample Final rolling temperature ° C Reel temperature ° C Rp0.2
    N / mm 2     rm
    N / mm 2     1 845 95 940 1243 2 845 95 997 1305 3 845 95 983 1199 4 * 850 420 742 803 5 * 850 420 691 793 6 * 850 420 641 741 7 845 95 916 1089 8th 845 95 1037 1293 9 845 95 1073 1328 10 * 835 455 672 768 11 * 835 455 643 760 12 * 835 455 676 778

    Das Warmband kann vor dem Kaltverformen in die Endform feuerverzinkt werden. Durch den Wärmebehandlungszyklus beim. Verzinken wird der Martensit angelassen. Ausgehend von einem, Warmband mit Zugfestigkeiten im Bereich von 1200 - 1400 N/mm2 stellen sich je nach Wärmebehandlungszyklus beim Verzinken Zugfestigkeiten zwischen 800 und 1100 N/mm2 ein.The hot strip can be hot-dip galvanized into the final shape before cold forming. Through the heat treatment cycle at. The martensite is left galvanized. Starting from a hot strip with tensile strengths in the range of 1200 - 1400 N / mm 2 , depending on the heat treatment cycle, tensile strengths between 800 and 1100 N / mm 2 are established during galvanizing.

    Beispiel 3:Example 3:

    Ein 2,0 und 1,6 mm dickes Warmband wurden verzinkt. Die folgende Tabelle 2 stellt die Eigenschaften im Walzzustand und nach dem Verzinken gegenüber: Walzzustand nach dem Verzinken Dicke Re Rm A80 Re Rm A80 mm N/mm2 % N/mm2 % 1,6 1052 1393 5,7 1065 1095 7 1,6 1048 1387 7,6 1040 1082 5,5 2,0 1098 1361 6,6 1058 1082 5,9 A 2.0 and 1.6 mm thick hot strip was galvanized. The following table 2 compares the properties in the rolled state and after galvanizing: rolled condition after galvanizing thickness re rm A80 re rm A80 mm N / mm 2 % N / mm 2 % 1.6 1052 1393 5.7 1065 1095 7 1.6 1048 1387 7.6 1040 1082 5.5 2.0 1098 1361 6.6 1058 1082 5.9

    Beispiel 4:Example 4:

    1,6 und 1,8 mm dickes Warmband wurde in der im. Beispiel 1 beschriebenen Weise erzeugt. Die Herstellungsparameter und die ermittelten Festigkeitseigenschaften sind in Tabelle 3 mitgeteilt, die auch die chemische Zusammensetzung des untersuchten Werkstoffes enthält.1.6 and 1.8 mm thick hot strip was used in the. example 1 described manner generated. The manufacturing parameters and the determined strength properties are in Table 3 communicated the chemical Contains composition of the investigated material.

    Beispiel 5:Example 5:

    In Tabelle 4 sind die entsprechenden Daten für 1,4 mm dickes Warmband mitgeteilt.

    Figure 00090001
    Figure 00100001
    The corresponding data for 1.4 mm thick hot strip are given in Table 4.
    Figure 00090001
    Figure 00100001

    Claims (8)

    1. A hot-rolled steel strip with a thickness of less than 5 mm, in particular less than 2 mm, having a tensile strength of 800 N/mm2 to 1400 N/mm2, containing (in percent by weight, wt %)
         0.08 % to 0.25 % carbon,
         1.20 % to 2.0 % manganese,
         0.02 % to 0.05 % aluminum,
         less than 0.04 % silicon,
         plus optionally one or more of the elements chromium, copper, molybdenum, nickel, nitrogen, titanium and boron with the following quantities:
      up to 1.0 % chromium,
      up to 0.1 % copper,
      up to 0.5 % molybdenum,
      up to 0.1 % nickel,
      up to 0.009 % nitrogen,
      titanium in an amount sufficient for stoichiometric binding of the nitrogen present in the steel (Ti = 3.4 % N), up to 0.0025 % B,
         with the remainder being iron and unavoidable impurities, including up to 0.015 % phosphorus and up to 0.003 % sulfur,
         and having a martensitic structure with less than 5 % total other structural constituents.
    2. The hot-rolled strip according to Claim 1, characterized in that the steel contains 0.12 % to 0.25 % carbon.
    3. The hot-rolled strip according to one of the preceding claims,
      characterized in that the carbon content is from 0.08 % to 0.15 %, the manganese content is from 1.75 % to 1.90 %, the chromium content is from 0.5 % to 0.6% and the nitrogen content is from 0.005 % to 0.009 % (each in wt %).
    4. The hot-rolled strip according to one of Claims 1 through 3,
      characterized in that it is hot-dip galvanized.
    5. A method of producing hot-rolled strip with a final thickness of less than 5 mm, in particular less than 2 mm, from a steel having a composition according to one of Claims 1 through 3, with tensile strength values of more than 800 N/mm2,
      characterized by the following measures:
      a slab ingot is heated to 1000°C to 1300 °C,
      prerolled in a temperature range from 950 °C to 1150°C,
      finish-rolled at a final rolling temperature above Ar3,
      the hot-rolled strip thus produced is cooled to a winding temperature in the range of 20 °C to below the martensite starting temperature and it is wound, so that a structure with more than 95 % martensite is obtained.
    6. The method according to Claim 5,
      characterized in that the cooling from the final rolling temperature to the winding temperature is carried out at t 8/5 of less than 10 sec.
    7. The method according to Claim 5 or 6,
      characterized in that the tensile strength of the hot-rolled strip is adjusted to a value in the range of 800 N/mm2 to 1400 N/mm2 through an appropriate choice of the winding temperature within the temperature range specified in Claim 5.
    8. Use of hot-dip galvanized hot-rolled strip constituted according to one of the Claims 1 through 3 and produced according to a method devised according to Claims 5 through 7 for mechanically high-stressed parts in automotive engineering, e.g., front and rear bumpers and side-impact bumpers.
    EP97931775A 1996-07-12 1997-07-04 Hot-rolled steel strip and method of making it Expired - Lifetime EP0910675B1 (en)

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    PCT/EP1997/003541 WO1998002589A1 (en) 1996-07-12 1997-07-04 Hot-rolled steel strip and method of making it

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    TR199900053T2 (en) 1999-03-22
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