EP1453984B1 - Procede de production de feuillards ou de toles a chaud en acier microallie - Google Patents

Procede de production de feuillards ou de toles a chaud en acier microallie Download PDF

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Publication number
EP1453984B1
EP1453984B1 EP01270630A EP01270630A EP1453984B1 EP 1453984 B1 EP1453984 B1 EP 1453984B1 EP 01270630 A EP01270630 A EP 01270630A EP 01270630 A EP01270630 A EP 01270630A EP 1453984 B1 EP1453984 B1 EP 1453984B1
Authority
EP
European Patent Office
Prior art keywords
temperature
hot strip
hot
weight
raw material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01270630A
Other languages
German (de)
English (en)
Other versions
EP1453984B8 (fr
EP1453984A1 (fr
Inventor
Wilfried Hänsch
Werner Scholten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Publication of EP1453984A1 publication Critical patent/EP1453984A1/fr
Publication of EP1453984B1 publication Critical patent/EP1453984B1/fr
Application granted granted Critical
Publication of EP1453984B8 publication Critical patent/EP1453984B8/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—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
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • the invention relates to a method for producing Hot strip or sheet of micro-alloyed steel.
  • the hot strips are made of a steel that is in % By weight not more than 0.3% C, not more than 0.5% Si, 0.3 2.0% Mn, ⁇ 0.05% Al, 0.01-0.02% Nb, 0.01-0.2% V and optionally 0.01-0.2% Mo and 0.01-0.2% Ti, balance Contains iron and unavoidable impurities.
  • This raw material produced in this steel is used in a Roll end temperature of at least 750 ° C to hot strip finish rolled, which immediately afterwards on a cooled to a maximum of 650 ° C reel temperature becomes. Subsequently, the hot strip is a final Subjected to heat treatment.
  • the object of the invention is, starting from the above-explained prior art cost-effective method for producing hot strips indicate that even with larger thicknesses a high Possess strength.
  • a microalloyed steel is produced which, in addition to micro-alloying elements (in% by weight) 0, 05-0.12% C, 0.2-0.5% Si, 1.5-2.2% Mn, ⁇ 0.025% P, ⁇ 0.01% S, balance iron and unavoidable impurities, to a starting material like slabs, thin slabs or blooms, potted; the starting material is heated to a temperature of 1300-1350 ° C; the heated starting material is pre-rolled at a degree of deformation of 36% to 43%; the pre-rolled starting material is thermo-mechanically hot rolled to a hot strip at a rolling end temperature above the Ac 3 temperature; the hot strip is cooled at a cooling rate of at least 15 ° C / s to a coiler temperature of at least 590 ° C and at most 630 ° C, and finally
  • the inventive dimensioning of the contents of the individual alloying elements and the targeted tuning of the rolling end temperature, the cooling rate and the coiling temperature hot strips which have the highest strengths even at thicknesses of more than 8 mm.
  • the yield strength is still at least 700 N / mm 2 .
  • a yield strength of at least 760 N / mm 2 can be achieved.
  • a supplementary heat treatment following the cooling in the coil is not required.
  • the high strength of steel produced according to the invention is due to the combined use of the elimination, Fine grain and solid solution hardening achieved. there lead the selected contents of the alloying elements C and Mn to the desired solid solution hardening.
  • the Precipitates of micro-alloying elements Ti, V and Nb completely dissolved.
  • the at the subsequent pre-deformation set Deformations lead to a fine, even dispersed and recrystallized austenite grain.
  • the excellent strength values make According to the invention produced hot strip in particular suitable for the production of load-bearing components Motor vehicles, such as heavily loaded Longitudinal beams of trucks.
  • the steel contains at least one of Micro-alloying elements V, Mo, Ti, Nb in the following Held (in weight%) 0.08 - 0.12% V, 0.1 - 0.2% Mo, 0.08 - 0.11% Ti and 0.05 - 0.06% Nb.
  • the Al content should be between 0.02 and 0.05% by weight.
  • the micro-alloying element niobium hinders this Austenite grain. In addition, it hinders the Recrystallization of the austenite grains during the Hot rolling.
  • Recrystallization during hot rolling is also avoided by hot rolling according to the invention at temperatures above the Ac 3 temperature.
  • the austenite / ferrite transformation occurs during strip cooling behind the last stand of the hot rolling mill. In this way, a recrystallized, fine-grained microstructure with low Perlitan turnover is obtained.
  • the ferrite grains have a size of 11 to 14 ASTM.
  • the cooling rate of at least 15 ° C / s is chosen to the hot strip of the preferably at least 840 ° C hot rolling end temperature sufficient cool down to the reel temperature quickly.
  • the precipitation hardness maximum by the Microalloying Ti and V and Nb achieved. This effect can be achieved particularly reliably if the reel temperature in the range of 600 ° C to 620 ° C lies.
  • Hot strips whose yield strength is at least 700 N / mm 2 even with a thickness of 16 mm, can be produced particularly reliably with the method according to the invention if the steel (in weight%) is 0.06-0.08% C, 0, 2 - 0.3% Si, 1.95 - 2.1% Mn, ⁇ 0.02% P and ⁇ 0.005% S contains. In this case, if present, the Ti content should not be more than 0.1% by weight.
  • hot strips whose yield strength is at least 760 N / mm 2 at a thickness of 13 mm can thereby be reliably produced by the steel (in weight%) being 0.10-0.12% C, 0 , 4 - 0.5% Si, 1.95 - 2.1% Mn, ⁇ 0.02% P, ⁇ 0.005% S.
  • the steel preferably has at least one of the micro-alloying elements V, Mo, Ti, Nb in the following contents (in% by weight): 0.08-0.10% V, 0.1-0.2% Mo, 0.09 0.11% Ti, 0.05-0.06% Nb.
  • the steel used in the invention can production-related or to the expression of certain Properties optionally one or more of the elements N, Cu, Ni, Sn, B or As, where the sum of the Content of these elements not more than 0.1 wt .-% is.
  • the Holding time during heating of slabs at least 135 minutes to ensure a safe warmth of the To ensure starting material.
  • the hot strip A emerging from the finish rolling scale was immediately after a reel temperature of 610 ° C water cooled and reeled. In the course of Water cooling were cooling rates of at least 15 ° C / s achieved.
  • the emerging from the finishing roll scale hot strip B was just like the hot strip A immediately after water cooled to a reel temperature of 610 ° C and coiled. In the course of the water cooling were again Cooling speeds of 15 ° C / s achieved.

Claims (10)

  1. Procédé de fabrication de feuillards ou de tôles à chaud,
    dans lequel on coule un acier micro-allié qui, en plus d'au moins l'un des éléments de micro-alliage V, Mo, Ti, Nb, dans les teneurs suivantes, en % en poids : V 0,08 à 0,12 %, Mo 0,1 à 0,2 %, Ti 0,08 à 0,11 %, Nb 0,05 à 0,06 %, contient les éléments suivants en % en poids :
    C:
    0,05 - 0,12 %
    Si:
    0,2 - 0,5 %
    Mn:
    1,5 - 2,2 %
    Al:
    0,02 - 0,05 %
    P:
    ≤ 0,025 %
    S:
    ≤ 0,01 %,
    ainsi que sélectivement, un ou plusieurs des éléments n, Cu, Ni, Sn, B et As, le reste étant le fer et des impuretés inévitables, la somme des éléments facultativement présents étant ≤ 0,1 % en poids, pour obtenir un pré-matériau qui présente par exemple la forme de brames, de pré-blocs ou de brames minces,
    dans lequel le pré-matériau est chauffé à une température de 1 300 à 1 150°C,
    dans lequel le pré-matériau réchauffé est prélaminé à un taux de déformation de 36 % à 43 %,
    dans lequel le matériau prélaminé est laminé à chaud par voie thermomécanique en un feuillard à chaud, la température finale de laminage étant située au-dessus de la température Ac3,
    dans lequel le feuillard à chaud est refroidi à une vitesse de refroidissement d'au moins 15°C/s jusqu'à une température de bobinage qui vaut au moins 590°C et au plus 630°C et
    le feuillard à chaud refroidi est enfin bobiné.
  2. Procédé selon la revendication 1, caractérisé en ce que le feuillard ou la tôle à chaud possèdent une limite d'allongement minimale de 700 N/mm2 pour une épaisseur à 8 mm.
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que l'acier contient (en % en poids) :
    C:
    0,06 - 008 %
    Si:
    0,2 - 0,3 %
    Mn:
    1,95 - 2,1 %
    Al:
    0,02 - 0,05 %
    P:
    ≤ 0,02 %
    S:
    ≤ 0,005 %.
  4. Procédé selon la revendication 3, caractérisé en ce que la teneur en Ti est d'au plus 0,1 % en poids.
  5. Procédé selon les revendications 1 ou 2, caractérisé en ce que l'acier contient (en % en poids) :
    C:
    0,10 - 0,12 %
    Si:
    0,4 - 0,5 %
    Mn:
    1,95 - 2,1 %
    Al:
    0,02 - 0,05 %
    P:
    ≤ 0,02 %
    S:
    ≤ 0,005 %,
  6. Procédé selon la revendication 5, caractérisé en ce que l'acier contient l'un au moins des éléments de micro-alliage V, Mo, T, Nb aux teneurs suivantes (en % en poids):
    V:
    0,08 - 0,10 %
    Mo:
    0,1 - 0,2 %
    Ti:
    0,09 - 0,11 %
    Nb:
    0,05 - 0,06 %
  7. Procédé selon les revendications 5 ou 6, caractérisé en ce que le feuillard ou la tôle à chaud possèdent une limite d'allongement minimum de 760 N/mm2 pour une épaisseur de 13 mm.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme pré-matériau, on traite des brames, et la durée de maintien des brames en préchauffage est au moins 135 minutes.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température finale de laminage est d'au moins 840°C.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température de bobinage est d'au moins 600°C et d'au plus 620°C.
EP01270630A 2000-12-16 2001-12-15 Procede de production de feuillards ou de toles a chaud en acier microallie Expired - Lifetime EP1453984B8 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10062919A DE10062919A1 (de) 2000-12-16 2000-12-16 Verfahren zum Herstellen von Warmband oder -blech aus einem mikrolegierten Stahl
DE10062919 2001-12-15
PCT/EP2001/014829 WO2002048410A1 (fr) 2000-12-16 2001-12-15 Procede de production de feuillards ou de toles a chaud en acier microallie

Publications (3)

Publication Number Publication Date
EP1453984A1 EP1453984A1 (fr) 2004-09-08
EP1453984B1 true EP1453984B1 (fr) 2005-04-13
EP1453984B8 EP1453984B8 (fr) 2005-07-27

Family

ID=7667534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01270630A Expired - Lifetime EP1453984B8 (fr) 2000-12-16 2001-12-15 Procede de production de feuillards ou de toles a chaud en acier microallie

Country Status (6)

Country Link
US (1) US20040040633A1 (fr)
EP (1) EP1453984B8 (fr)
AT (1) ATE293175T1 (fr)
DE (2) DE10062919A1 (fr)
ES (1) ES2240337T3 (fr)
WO (1) WO2002048410A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1396550A1 (fr) * 2002-08-28 2004-03-10 ThyssenKrupp Stahl AG Procédé pour la fabrication d' une bande à chaud
ATE432372T1 (de) * 2006-10-30 2009-06-15 Thyssenkrupp Steel Ag Verfahren zum herstellen von stahl-flachprodukten aus einem ein komplexphasen-gefüge bildenden stahl
PL1918406T3 (pl) * 2006-10-30 2009-10-30 Thyssenkrupp Steel Ag Sposób wytwarzania płaskich produktów stalowych z wielofazowej stali mikrostopowej z borem
FI20095528A (fi) * 2009-05-11 2010-11-12 Rautaruukki Oyj Menetelmä kuumavalssatun nauhaterästuotteen valmistamiseksi sekä kuumavalssattu nauhaterästuote
FI122143B (fi) * 2009-10-23 2011-09-15 Rautaruukki Oyj Menetelmä korkealujuuksisen sinkityn muotovalmisteen valmistamiseksi sekä muotovalmiste
JP5365673B2 (ja) 2011-09-29 2013-12-11 Ｊｆｅスチール株式会社 材質均一性に優れた熱延鋼板およびその製造方法
US10301698B2 (en) 2012-01-31 2019-05-28 Jfe Steel Corporation Hot-rolled steel sheet for generator rim and method for manufacturing the same
JP6778943B2 (ja) 2014-12-19 2020-11-04 ニューコア・コーポレーション 熱間圧延軽量マルテンサイト鋼板及びその製造方法
CN111519105B (zh) * 2020-05-12 2021-06-15 首钢集团有限公司 一种汽车构件钢及其制备方法、汽车构件

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2133744B2 (de) * 1971-07-07 1973-07-12 August Thyssen-Hütte AG, 4100 Duisburg Die verwendung eines vollberuhigten stahles fuer gegenstaende aus warmgewalztem band
US3925111A (en) * 1972-12-31 1975-12-09 Nippon Steel Corp High tensile strength and steel and method for manufacturing same
JPS58136719A (ja) * 1982-02-05 1983-08-13 Nippon Kokan Kk <Nkk> 高強度熱延鋼板の製造方法
JPS61281814A (ja) * 1985-06-06 1986-12-12 Kobe Steel Ltd バウシンガ−効果感受性の低い高強度熱延鋼板の製造方法
JPS63223130A (ja) * 1987-03-13 1988-09-16 Kawasaki Steel Corp 加工性に優れた高張力熱延鋼板の製造方法
JPH059572A (ja) * 1991-07-08 1993-01-19 Sumitomo Metal Ind Ltd 加工性に優れた熱延鋼板の製造法
FR2688009B1 (fr) * 1992-02-28 1994-05-27 Lorraine Laminage Procede d'elaboration d'une tole d'acier et tole d'acier obtenue par ce procede.
JP3767132B2 (ja) * 1997-11-11 2006-04-19 Ｊｆｅスチール株式会社 高延性を有し、かつ材質均一性に優れた高強度熱延鋼板の製造方法

Also Published As

Publication number Publication date
WO2002048410A1 (fr) 2002-06-20
EP1453984B8 (fr) 2005-07-27
US20040040633A1 (en) 2004-03-04
DE10062919A1 (de) 2002-06-27
ES2240337T3 (es) 2005-10-16
EP1453984A1 (fr) 2004-09-08
ATE293175T1 (de) 2005-04-15
DE50105924D1 (de) 2005-05-19

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