EP2094876B1 - Procédé de fabrication d'un feuillard d'acier à partir d'un acier biphasique à haute résistance mécanique - Google Patents

Procédé de fabrication d'un feuillard d'acier à partir d'un acier biphasique à haute résistance mécanique Download PDF

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Publication number
EP2094876B1
EP2094876B1 EP07817796.1A EP07817796A EP2094876B1 EP 2094876 B1 EP2094876 B1 EP 2094876B1 EP 07817796 A EP07817796 A EP 07817796A EP 2094876 B1 EP2094876 B1 EP 2094876B1
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EP
European Patent Office
Prior art keywords
steel
process according
steel strip
content
hot
Prior art date
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Application number
EP07817796.1A
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German (de)
English (en)
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EP2094876A1 (fr
Inventor
Jürgen SPEHR
Thorsten Maiwald
Thomas Evertz
Manuel Otto
Sven Schulz
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.)
Salzgitter Flachstahl GmbH
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Salzgitter Flachstahl GmbH
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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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

Definitions

  • the invention relates to a method for producing a cold-rolled or hot-rolled steel strip from a high-strength dual-phase steel with excellent forming properties, in particular for lightweight vehicle construction according to the preamble of claim 1.
  • Dual phase steels which are characterized by very good formability and simultaneously high strength values, are being used more and more frequently in this area. Dual phase steels have a predominantly ferritic-martensitic structure.
  • cold-rolled steel strips are annealed by recrystallization in a continuous annealing process to form a thin sheet which is easy to form.
  • the furnace parameters (throughput speed, annealing temperature, cooling rate) are set according to the required microstructure and the mechanical-technological properties.
  • the cold strip is heated in the continuous annealing furnace to a temperature such that the required ferritic-martensitic microstructure formation is established during cooling.
  • the annealing treatment is usually carried out in a continuous annealing furnace upstream of the galvanizing bath.
  • the required dual-phase microstructure is also only occasionally set in the hot-rolled strip during the annealing treatment in the continuous furnace, in order to be able to realize the required mechanical properties starting from a homogenous austenite microstructure.
  • the known steels have corresponding contents z. B. on Cr, Mo, Nb or B.
  • the costly elements Cr and Mo have a strong effect on the production costs of the dual-phase steel.
  • a narrow process window in this context means that, depending on the thickness of the strip to be annealed, the throughput speed has to be adjusted in order to achieve a homogeneous temperature distribution in the strip and during cooling the required dual-phase structure and the mechanical-technological properties.
  • the required strip properties can be achieved with the same furnace parameters even with different thicknesses of strips to be annealed.
  • a method for producing a steel strip with different thickness over the strip length is z. B. in the DE 100 37 867 A1 described.
  • the invention is therefore based on the object of specifying another cost-effective alloy concept for a high-strength steel with dual-phase structure, with which the process window for the continuous annealing of hot or cold strips can be extended so that in addition to different thickness bands and steel bands with over tape length and possibly Bandwidth varying thickness can be produced with the most homogeneous mechanical and technological properties.
  • this object is achieved by a steel with the following contents in mass%: C 0.1 to ⁇ 0.16 al 0.02 to ⁇ 0.05 Si 0.40 to ⁇ 0.60 Mn 1.5 to ⁇ 2.0 P ⁇ 0.020 S ⁇ 0.003 N ⁇ 0.01 Nb ⁇ 0.01 to 0.05 V ⁇ 0.02 to 0.10 with optional addition of Ti of ⁇ 0.01 Remainder of iron including conventional steel-supporting elements, wherein the required dual-phase microstructure is produced during a continuous annealing, and wherein the cold- or hot-rolled steel strip is heated in the continuous annealing furnace in a one-step process to a temperature in the range of 820 to 1000 ° C, preferably 840 to 1000 ° C and the annealed steel strip is then cooled from the annealing temperature at a cooling rate between 15 and 30 ° C / sec.
  • the inventive high-strength dual-phase steel for lightweight vehicle construction is characterized by the fact that with a targeted addition of V and Nb waiving the costly alloying elements Mo or Cr, such a high conversion inertia is achieved, which leads to the fact that during the continuous annealing also in bands with over Band length or width of varying thickness of a fully austenitic matrix with very high process reliability the required dual-phase microstructure with homogeneous mechanical-technological properties can be adjusted.
  • the steel according to the invention offers the advantage of a significantly enlarged process window in comparison to the known steels. This results in increased process reliability during continuous annealing or hot-dip galvanizing of cold and hot strip with dual-phase structure. Thus, both for hot-dip galvanized, as well as only pass-annealed hot or cold strips homogeneous mechanical-technological properties can be ensured in the band. This applies to the continuous annealing of successive bands with different strip thickness and also in particular for strips with varying sheet thickness over strip length or width.
  • it is a dual-phase steel with about 20% martensite embedded in the strength class of about 800 MPa, in particular for continuous hot-dip galvanizing and for use in a continuous annealing plant.
  • the fine granularity of the structure is adjusted according to the invention via the formation of nitrides or carbonitrides as a function of the N content of the steel, and the mechanical-technological properties are influenced.
  • the field of application of the steel for rolling with flexible sheet thicknesses in the longitudinal and transverse direction to the rolling direction is opened by its insensitivity to process fluctuations during the heat treatment.
  • This insensitivity is caused by the use of Nb and especially V, which require a conversion-free or conversion-free zone during cooling.
  • the steel according to the invention has a V content of at least 0.02% and an Nb content of at least 0.01%.
  • Nb also acts as a grain refining element, with the amount of Nb addition being adjusted to the actual C and N content of the steel.
  • the addition of V is also adjusted to the contents of C and N, but the amount of addition is adjusted so that enough V is kept in solution to achieve a sufficiently high conversion inertia. If the aim is to achieve as conversion-stable a behavior as possible and thus the widest possible process window in continuous annealing, the V content is at least 0.06 to 0.10% and the Nb content is more than 0.02 to 0.05%. A further increase in the contents of V or Nb then brings no further improvement with regard to a further delayed transformation of the steel and thus to the width of the process window in the continuous annealing.
  • the band to be annealed is first heated to a temperature such that a fully austenitic structure is present.
  • the annealing temperatures are for the steel according to the invention between about 820 and about 1000 ° C, depending on the specific alloy composition.
  • the content of ferrite and (residual) austenite which occurs during cooling remains until after the "galvanizing" process step.
  • the remaining Austenitanteil then converts completely to martensite on further cooling.
  • the galvanizing parameters can vary over a wide range. Depending on the sheet thickness, the galvanizing speeds are between 60 and 120m / min.
  • the cooling rates before and after the zinc bath are at relatively low 10 to 30 ° C / sec.
  • the material produced can be processed both as a cold strip and as a hot strip, in the dressed and undressed and also in the heat-treated state (intermediate annealing) via a hot-dip galvanizing line or pure continuous annealing system.

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

Claims (8)

  1. Procédé de fabrication d'une bande d'acier laminée à froid ou laminée à chaud à partir d'un acier dual-phase de grande résistance ayant d'excellentes caractéristiques de formage, en particulier pour la construction légère en automobile, composé des éléments suivants (teneur en %-masse) : C de 0,1 1 à ≤ 0,16 Al de 0,02 à ≤ 0,05 Si de 0,40 à ≤ 0,60 Mn de 1,5 à ≤ 2,0 P ≤ 0,020 S ≤ 0,003 N ≤ 0,01 Nb de ≥ 0,01 à 0,05 V de ≥ 0,02 à 0,10
    avec addition optionnelle de Ti de ≤ 0,01
    le reste étant du fer, y compris les habituelles impuretés accompagnant l'acier, la structure dual-phase demandée étant produite pendant un recuit en continu, caractérisé en ce que
    la bande d'acier laminée à froid ou laminée à chaud est chauffée dans le four de recuit en continu dans un processus à étape unique à une température dans la plage de 820 à 1 000 °C, de préférence de 840 à 1 000 °C, et en ce que la bande d'acier recuite est ensuite refroidie à partir de la température de recuit à une vitesse de refroidissement entre 15 et 30 °C/s.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la teneur en V est ≥ 0,06 %.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    la teneur en V est ≥ 0,08 %.
  4. Procédé selon les revendications 1-3,
    caractérisé en ce que
    la teneur en Nb est ≥ 0,02 %.
  5. Procédé selon les revendications 1-3,
    caractérisé en ce que
    la teneur en Nb est ≥ 0,04 %.
  6. Procédé selon l'une des revendications 1-5,
    caractérisé en ce que
    la teneur en Ti est ≥ 0,01 %.
  7. Procédé selon l'une des revendications 1-6,
    caractérisé en ce que
    la bande d'acier est soumise à un affinage dans un bain de fusion.
  8. Procédé selon l'une des revendications 1-7,
    caractérisé en ce que
    la bande d'acier est ensuite dressée.
EP07817796.1A 2006-11-14 2007-11-13 Procédé de fabrication d'un feuillard d'acier à partir d'un acier biphasique à haute résistance mécanique Active EP2094876B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006054300A DE102006054300A1 (de) 2006-11-14 2006-11-14 Höherfester Dualphasenstahl mit ausgezeichneten Umformeigenschaften
PCT/DE2007/002074 WO2008058530A1 (fr) 2006-11-14 2007-11-13 Procédé de fabrication d'un feuillard d'acier à partir d'un acier biphasé à haute résistance mécanique

Publications (2)

Publication Number Publication Date
EP2094876A1 EP2094876A1 (fr) 2009-09-02
EP2094876B1 true EP2094876B1 (fr) 2014-04-16

Family

ID=39128645

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Application Number Title Priority Date Filing Date
EP07817796.1A Active EP2094876B1 (fr) 2006-11-14 2007-11-13 Procédé de fabrication d'un feuillard d'acier à partir d'un acier biphasique à haute résistance mécanique

Country Status (6)

Country Link
US (1) US20100000634A1 (fr)
EP (1) EP2094876B1 (fr)
KR (1) KR20090089311A (fr)
DE (1) DE102006054300A1 (fr)
RU (1) RU2443787C2 (fr)
WO (1) WO2008058530A1 (fr)

Families Citing this family (13)

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Publication number Priority date Publication date Assignee Title
DE102010034161B4 (de) 2010-03-16 2014-01-02 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung von Werkstücken aus Leichtbaustahl mit über die Wanddicke einstellbaren Werkstoffeigenschaften
DE102011010040B3 (de) 2011-02-02 2012-08-02 Salzgitter Flachstahl Gmbh Verfahren und Einrichtung zum Erzeugen eines gegossenen Bandes aus Stahl mit über den Bandquerschnitt und die Bandlänge einstellbaren Werkstoffeigenschaften
DE102011056847B4 (de) 2011-12-22 2014-04-10 Thyssenkrupp Rasselstein Gmbh Stahlblech zur Verwendung als Verpackungsstahl sowie Verfahren zur Herstellung eines Verpackungsstahls
DE102012002079B4 (de) 2012-01-30 2015-05-13 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines kalt- oder warmgewalzten Stahlbandes aus einem höchstfesten Mehrphasenstahl
DE102012006017A1 (de) * 2012-03-20 2013-09-26 Salzgitter Flachstahl Gmbh Hochfester Mehrphasenstahl und Verfahren zur Herstellung eines Bandes aus diesem Stahl
DE102012006941B4 (de) 2012-03-30 2013-10-17 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines Bauteils aus Stahl durch Warmumformen
RU2491357C1 (ru) * 2012-05-10 2013-08-27 Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский технологический университет "МИСиС" Способ производства листовой стали
US9593399B2 (en) 2012-12-13 2017-03-14 Thyssenkrupp Steel Usa, Llc Process for making cold-rolled dual phase steel sheet
DE102013101847B3 (de) 2013-02-25 2014-03-27 Thyssenkrupp Rasselstein Gmbh Verfahren zur Herstellung eines korrosionsbeständigen Stahlblechs
EP2994548B1 (fr) 2013-05-06 2022-10-26 Salzgitter Flachstahl GmbH Procédé de fabrication de pièces en acier léger
DE102013013067A1 (de) * 2013-07-30 2015-02-05 Salzgitter Flachstahl Gmbh Siliziumhaltiger, mikrolegierter hochfester Mehrphasenstahl mit einer Mindestzugfestigkeit von 750 MPa und verbesserten Eigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
CN105420605A (zh) * 2015-11-30 2016-03-23 钢铁研究总院 一种超低屈强比冷轧双相钢及其制造方法
DE102017123236A1 (de) * 2017-10-06 2019-04-11 Salzgitter Flachstahl Gmbh Höchstfester Mehrphasenstahl und Verfahren zur Herstellung eines Stahlbandes aus diesem Mehrphasenstahl

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Also Published As

Publication number Publication date
DE102006054300A1 (de) 2008-05-15
RU2443787C2 (ru) 2012-02-27
US20100000634A1 (en) 2010-01-07
KR20090089311A (ko) 2009-08-21
EP2094876A1 (fr) 2009-09-02
RU2009122381A (ru) 2010-12-20
WO2008058530A1 (fr) 2008-05-22

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