EP1699582B1 - Procede pour produire des feuillards a chaud a partir d'un acier leger - Google Patents

Procede pour produire des feuillards a chaud a partir d'un acier leger Download PDF

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Publication number
EP1699582B1
EP1699582B1 EP04802997.9A EP04802997A EP1699582B1 EP 1699582 B1 EP1699582 B1 EP 1699582B1 EP 04802997 A EP04802997 A EP 04802997A EP 1699582 B1 EP1699582 B1 EP 1699582B1
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EP
European Patent Office
Prior art keywords
content
conveyor belt
strip
melt
further treatment
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.)
Active
Application number
EP04802997.9A
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German (de)
English (en)
Other versions
EP1699582A1 (fr
Inventor
Joachim Kroos
Karl-Heinz Spitzer
Georg Frommeyer
Volker Flaxa
Udo BRÜX
Klaus Brokmeier
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.)
Max Planck Institut fuer Eisenforschung
Salzgitter Flachstahl GmbH
Original Assignee
Max Planck Institut fuer Eisenforschung
Salzgitter Flachstahl GmbH
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
Priority claimed from DE102004061284A external-priority patent/DE102004061284A1/de
Application filed by Max Planck Institut fuer Eisenforschung, Salzgitter Flachstahl GmbH filed Critical Max Planck Institut fuer Eisenforschung
Publication of EP1699582A1 publication Critical patent/EP1699582A1/fr
Application granted granted Critical
Publication of EP1699582B1 publication Critical patent/EP1699582B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0605—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two belts, e.g. Hazelett-process
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing of ferrous alloys
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/041—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular fabrication or treatment of ingot or slab
    • C21D8/0415—Rapid solidification; Thin strip casting
    • 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
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling

Definitions

  • the invention relates to a method for producing hot strips of a deformable, especially good cold deep drawable lightweight structural steel according to the preamble of claim 1.
  • TRIP Transformation Induced Plasticity
  • TWIP winning Induced Plasticity
  • the resulting macrosegregation which can also lead to intermetallic phases, leads to serious belt defects during hot rolling.
  • High-alloyed steels basically also tend to form internal cracks, which ultimately represent marrow defect defects. These result z. B. from bending stresses during the manufacturing process.
  • the invention has for its object to provide a method for producing hot strips of a formable, especially good cold thermoformable Textilbaustah, I consisting of the main elements Si, Al and Mn, which has a high tensile strength and TRIP and / or TWIP properties, which avoids the disadvantages described above.
  • the steel of the invention is geglagemig pronounced either as a stabilized ⁇ -crystal or as a partially stabilized ⁇ -mixed crystal with a defined stacking fault energy, the z. T. multiple TRIP effect shows.
  • the advantage of the proposed lightweight steel number is the fact that a wide range of strength and ductility requirements can be met by targeted alloy composition and choice of process parameters such as degree of deformation and heat treatment, with tensile strengths up to 1400 MPa are possible.
  • the carbon addition plays a key role.
  • the hydrogen content in the steel plays an important role.
  • the phenomenon manifests itself in that z. B. on deep-drawn cups after some time in the edge area cracks occur.
  • the cracking process can last for several days.
  • the lightweight steel mainly with TRIP or with TWIP properties it may be necessary to equip the lightweight steel mainly with TRIP or with TWIP properties. This can be achieved most easily by controlling the Mn content. If the lower range of about 9 - 18% is selected, then an end product with predominantly TRIP properties is to be expected, whereas if the upper range is preferred with about 22-30%, the TWIP properties predominate. As already mentioned, this control is also possible by targeted addition of other elements, in particular carbon. In this connection, it should be mentioned that, from the viewpoint of sufficient corrosion resistance, a higher Cr content is advantageous for the lower Mn range specified and a lower Cr content is advantageous for the upper Mn range.
  • the considered disadvantageous bending during solidification is avoided in that the underside of the casting tape receiving the melt is supported on a plurality of juxtaposed rollers.
  • the support is reinforced in such a way that in the region of the casting belt, a negative pressure is generated, so that the casting belt is pressed firmly on the rollers.
  • the length of the conveyor belt is selected so that at the end of the conveyor belt before its deflection, the Vorband is largely solidified.
  • a homogenization zone which is used for temperature compensation and possible stress relief.
  • a further treatment which may be a direct Aufcoilen the Vorbandes or consists of an upstream rolling process to apply the required deformation of at least 50%, preferably of> 70%.
  • the direct Aufcoilen the Vorbandes has the advantage that you can choose the casting speed in terms of optimal solidification conditions, regardless of the cycle of the subsequent rolling process.
  • the strand shell In the formation of the strand shell at the beginning of solidification, it may locally come to lifting the strand shell from the circulating belt of the strip casting. Under certain circumstances, this leads to unacceptable unevenness of the underside of the produced pre-strip. To avoid this, it is necessary for all surface elements of the forming strand shell of a strip extending over the width of the conveyor belt to ensure the same cooling conditions as possible. This can be achieved by conditioning the top of the rotating belt, z. B. by a targeted structuring or by applying a thermally insulating release layer.
  • One of the aforementioned structuring measures is z. B. sandblasting or brushing the top of the rotating belt.
  • An example of the thermally insulating release layer is the coating by plasma spraying with, for example, aluminum oxide or zirconium oxide.
  • Another embodiment of a structuring is the imprinting of a nub structure, for. B. with upward pimples of some 100 microns in height and a few millimeters in diameter and a distance of the pimples of a few millimeters.
  • the rolled tensile specimen gave a tensile strength of 1046 MPa and an elongation (A80) of 35%. Depending on the degree of deformation and heat treatment, the tensile strength can be increased to over 1100 MPa and the elongation (A80) over 40%.
  • a second example shows the possibility of increasing the strength and ductility properties by increasing the carbon content at nearly the same Mn content.
  • the three examples show the range of variation in strength and elongation, with the Mn and C content playing a key role.
  • the influence of the analysis is superimposed by treatments of the hot strip in the form of annealing and / or by combined cold forming (eg rolling, drawing, deep drawing) and intermediate annealing or final annealing.

Landscapes

  • 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)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (15)

  1. Procédé de production de feuillards à chaud à partir d'un acier léger façonnable, présentant en particulier une bonne aptitude à l'emboutissage profond à froid, composé des éléments principaux Si, Al et Mn, qui présente une haute résistance à la traction et des propriétés TRIP et/ou TWIP,
    caractérisé en ce que
    les teneurs en pourcentage massique sont de
    0,04 à ≤ 1,0 pour C
    0,05 à < 4,0 pour Al
    0,05 à ≤ 6,0 pour Si
    9,0 à ≤ 30,0 pour Mn
    en ce que, optionnellement, les teneurs en pourcentage massique sont de
    jusqu'à ≤ 6,5 pour Cr
    jusqu'à ≤ 4,0 pour Cu
    et en ce que Ti, Zr, cumulés, représentent jusqu'à ≤ 0,7 et Nb, V, cumulés, jusqu'à ≤ 0,06 et, pour H2, on a ≤ 5 à 20 ppm, le reste étant constitué de fer et d'impuretés inévitables, et dans lequel une matière fondue est coulée dans une installation horizontale de coulée de feuillards à une dimension proche de la dimension finale, à débit tranquillisé et sans flexion, pour donner une ébauche de feuillard dans la plage entre 6 et 15 mm,
    des conditions de refroidissement identiques étant obtenues par le conditionnement du côté supérieur de la bande de transport rotative par sablage, brossage ou impression d'une structure à picots ou par l'application d'une couche de séparation thermiquement isolante, pour tous les éléments de surface de la croûte solidifiée, qui se forme au début de la solidification, d'un ruban s'étendant sur la largeur de la bande de transport, un traitement ultérieur étant ensuite réalisé.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la teneur en carbone est de 0,06 à ≤ 0,7 %.
  3. Procédé selon les revendications 1 et 2,
    caractérisé en ce que
    la teneur en Mn est de 9 à 18 %.
  4. Procédé selon les revendications 1 et 2,
    caractérisé en ce que
    la teneur en Mn est de 18 - 22 %.
  5. Procédé selon les revendications 1 à 4,
    caractérisé en ce que
    la teneur en Cr est de 0,3 - 1,0 %.
  6. Procédé selon les revendications 1 et 2,
    caractérisé en ce que
    la teneur en Mn est de 22 - 30 %.
  7. Procédé selon les revendications 1 et 6,
    caractérisé en ce que
    la teneur en Cr est de 0,05 - 0,2 %.
  8. Procédé selon les revendications 1 à 7,
    caractérisé en ce que
    la teneur en Si est de 2,0 - 4,0 %.
  9. Procédé selon les revendications 1 à 8,
    caractérisé en ce que
    la teneur en Al est de 2,0 - 3,0 %.
  10. Procédé selon les revendications 1 à 9,
    caractérisé en ce que
    la vitesse d'arrivée de la matière fondue est égale à la vitesse de la bande de transport rotative.
  11. Procédé selon une des revendications 1 à 10,
    caractérisé en ce que,
    à l'extrémité de la bande de transport, la matière fondue placée sur la bande de transport est solidifiée dans une très large mesure.
  12. Procédé selon les revendications 1 et 11,
    caractérisé en ce que,
    après la solidification complète et avant le début de la suite du traitement, l'ébauche de feuillard traverse une zone d'homogénéisation.
  13. Procédé selon les revendications 1 et 12,
    caractérisé en ce que
    la suite du traitement consiste en un bobinage de l'ébauche de feuillard.
  14. Procédé selon les revendications 1 et 12,
    caractérisé en ce que
    l'ébauche de feuillard est soumise en ligne à un processus de laminage, puis est bobinée.
  15. Procédé selon la revendication 14,
    caractérisé en ce que
    le taux de déformation est d'au moins 50 %, de préférence > 70 %.
EP04802997.9A 2003-12-23 2004-12-22 Procede pour produire des feuillards a chaud a partir d'un acier leger Active EP1699582B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10361952 2003-12-23
DE102004061284A DE102004061284A1 (de) 2003-12-23 2004-12-14 Verfahren zum Erzeugen von Warmbändern aus Leichtbaustahl
PCT/DE2004/002817 WO2005061152A1 (fr) 2003-12-23 2004-12-22 Procede pour produire des feuillards a chaud a partir d'un acier leger

Publications (2)

Publication Number Publication Date
EP1699582A1 EP1699582A1 (fr) 2006-09-13
EP1699582B1 true EP1699582B1 (fr) 2013-12-11

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EP04802997.9A Active EP1699582B1 (fr) 2003-12-23 2004-12-22 Procede pour produire des feuillards a chaud a partir d'un acier leger

Country Status (4)

Country Link
US (1) US7806165B2 (fr)
EP (1) EP1699582B1 (fr)
KR (1) KR101178775B1 (fr)
WO (1) WO2005061152A1 (fr)

Cited By (1)

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WO2015197412A1 (fr) 2014-06-25 2015-12-30 Salzgitter Flachstahl Gmbh Produit en acier servant à protéger des composants électriques d'une détérioration mécanique

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DE102005024029B3 (de) * 2005-05-23 2007-01-04 Technische Universität Bergakademie Freiberg Austenitischer Leichtbaustahl und seine Verwendung
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EP2406404B1 (fr) * 2009-03-11 2017-08-23 Salzgitter Flachstahl GmbH Procédé de production d'un feuillard à chaud par coulée horizontale à partir d'acier ferritique
RU2492022C2 (ru) * 2009-03-11 2013-09-10 Зальцгиттер Флахшталь Гмбх Способ изготовления горячекатаной полосы
JP5437482B2 (ja) * 2009-04-28 2014-03-12 ヒュンダイ スチール カンパニー 高強度及び高軟性を有する高マンガン窒素含有鋼板及びその製造方法
DE102009030324A1 (de) * 2009-06-24 2011-01-05 Voestalpine Stahl Gmbh Manganstahl und Verfahren zur Herstellung desselben
EP2383353B1 (fr) 2010-04-30 2019-11-06 ThyssenKrupp Steel Europe AG Acier à résistance élevée comprenant du Mn, produit plat en acier composé d'un tel acier et son procédé de fabrication
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EP2721334B1 (fr) * 2011-06-17 2020-03-18 National Oilwell Varco Denmark I/S Tuyau flexible non collé
CN102925790B (zh) * 2012-10-31 2014-03-26 钢铁研究总院 一种连续退火工艺生产高强塑积汽车用钢板的方法
EP2994548B1 (fr) * 2013-05-06 2022-10-26 Salzgitter Flachstahl GmbH Procédé de fabrication de pièces en acier léger
EP3095889A1 (fr) * 2015-05-22 2016-11-23 Outokumpu Oyj Procédé de fabrication d'un composant en acier austénitique
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RU2615738C1 (ru) * 2016-02-08 2017-04-10 Федеральное государственное автономное образовательное учреждение высшего образования "Белгородский государственный национальный исследовательский университет" (НИУ "БелГУ") Высокопрочная сталь системы Fe-Mn-Al-C, обладающая эффектом TWIP и TRIP
RU2643119C2 (ru) * 2016-05-04 2018-01-30 Федеральное государственное автономное образовательное учреждение высшего образования "Белгородский государственный национальный исследовательский университет" (НИУ "БелГУ") Способ деформационно-термической обработки высокомарганцевой стали
DE102016110661A1 (de) * 2016-06-09 2017-12-14 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines kaltgewalzten Stahlbandes aus einem hochfesten, manganhaltigen Stahl
DE102016117494A1 (de) 2016-09-16 2018-03-22 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines umgeformten Bauteils aus einem mittelmanganhaltigen Stahlflachprodukt und ein derartiges Bauteil
CN109923233A (zh) 2016-11-02 2019-06-21 德国沙士基达板材有限公司 用于低温应用的中锰钢产品及其制造方法
DE102018102974A1 (de) 2018-02-09 2019-08-14 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines Bauteils durch Warmumformen eines Vorproduktes aus manganhaltigem Stahl und ein warmumgeformtes Stahlbauteil

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WO2015197412A1 (fr) 2014-06-25 2015-12-30 Salzgitter Flachstahl Gmbh Produit en acier servant à protéger des composants électriques d'une détérioration mécanique
DE102014009534A1 (de) 2014-06-25 2015-12-31 Salzgitter Flachstahl Gmbh Stahlprodukt zum Schutz elektrischer Bauteile vor mechanischer Beschädigung

Also Published As

Publication number Publication date
KR20070007034A (ko) 2007-01-12
US20070289717A1 (en) 2007-12-20
EP1699582A1 (fr) 2006-09-13
US7806165B2 (en) 2010-10-05
WO2005061152A1 (fr) 2005-07-07
KR101178775B1 (ko) 2012-09-07

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