EP2406404B1 - Procédé de production d'un feuillard à chaud par coulée horizontale à partir d'acier ferritique - Google Patents

Procédé de production d'un feuillard à chaud par coulée horizontale à partir d'acier ferritique Download PDF

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Publication number
EP2406404B1
EP2406404B1 EP09775845.2A EP09775845A EP2406404B1 EP 2406404 B1 EP2406404 B1 EP 2406404B1 EP 09775845 A EP09775845 A EP 09775845A EP 2406404 B1 EP2406404 B1 EP 2406404B1
Authority
EP
European Patent Office
Prior art keywords
strip
hot
rolling
rolled
rough
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.)
Not-in-force
Application number
EP09775845.2A
Other languages
German (de)
English (en)
Other versions
EP2406404A1 (fr
Inventor
Karl-Heinz Spitzer
Bianca Springub
Joachim Konrad
Hellfried Eichholz
Markus SCHÄPERKÖTTER
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
SMS Group GmbH
Original Assignee
Salzgitter Flachstahl GmbH
SMS Group 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
Application filed by Salzgitter Flachstahl GmbH, SMS Group GmbH filed Critical Salzgitter Flachstahl GmbH
Publication of EP2406404A1 publication Critical patent/EP2406404A1/fr
Application granted granted Critical
Publication of EP2406404B1 publication Critical patent/EP2406404B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • C21D8/0215—Rapid solidification; Thin strip casting
    • 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
    • C21D2211/005—Ferrite
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn

Definitions

  • the invention relates to a method for producing a hot strip of a conversion-free ferritic steel, in which a melt is cast into a precursor and this is then rolled into a hot strip.
  • Conversion-free ferritic steels are via the usual continuous casting route, i. H. Continuous casting of the melt into a slab or thin slab, which is rolled either in-line or separately to a hot strip, or not produced with the required properties.
  • the slab or thin slab produced by continuous casting has macrosegregations and forms voids.
  • the precursor has a very coarse grain and the casting powder is problematic due to the high aluminum content of the ferritic steel.
  • the specified upper limit for the thickness of 6 mm can not be achieved with the existing systems, the actual maximum thickness to be set is usually 4 mm, in special cases at max. 5 mm.
  • the disadvantage is that the low initial thickness of the hot strip only a low degree of hot working during rolling is possible when a hot strip thickness of 2-3 mm is sought.
  • this thickness range is interesting, for example, for the use of the hot strip as a lightweight component in the exhaust system of vehicles.
  • the hot strip can be produced from 2 - 3 mm thick hot strip at a degree of deformation of 40 - 50% cold strip with a thickness of, for example, 1.0 - 1.8 mm, which in turn z. B can be used in the exhaust system of vehicles.
  • a low degree of hot forming means coarse grain, which has a negative effect on the ductility and thus on the formability of the hot strip.
  • hot strips are known whose composition is in the ranges of ⁇ 1.5, ⁇ 30 r,> 2 Al, ⁇ 30 Mn and ⁇ 5 Si ( EP0826787A2 . EP1995336A1 ).
  • the object of the invention is therefore to provide a method for producing hot strip from a conversion-free ferritic steel, with the fine while maintaining the advantages of the two-roll casting machine in the hot strip of 2 - 3 mm thickness can be set.
  • This object is achieved by a method in which the melt flow-smoothed in a horizontal strip casting and bending free to a pre-strip in the range between 6 and 20 mm and then rolled to hot strip with a degree of deformation of at least 50%.
  • the advantage of the proposed method is the fact that when using a horizontal strip casting machine as a casting machine, the advantages of the known two-roller casting machine, such as reduction of macrosegregations, suppression of voids and avoiding G confusepulverproblematik, even at high Al contents in ferritic steel also come into play and beyond the thickness of the hot strip is considerably greater than the thickness of a hot strip produced by means of a two-roller casting machine.
  • 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.
  • Rolling from pre-strip to hot strip can be done either in-line or separately off-line. Before off-line rolling, the pre-strip can be either directly hot-rolled or sliced into sheets prior to cooling after production. The strip or sheet material is then reheated after eventual cooling and unwound for off-line rolling or reheated and rolled as a sheet.
  • a preferred grade for the ferritic steel is one having high Mn contents up to 30 wt%, with high Al contents of> 2 preferably> 5 wt% and Cr contents up to 30 wt%, and Si. Contents of ⁇ 5 wt .-% and C contents of ⁇ 1.5 wt .-%.
  • Another preferred grade is characterized by containing no Mn and no Si at comparable C, Cr and Al contents.
  • Both mentioned grades may optionally contain one or more precipitation-forming elements of the type B, Ta, Zr, Nb, V, Ti, Mo and W, totaling at most 2% by weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (16)

  1. Procédé de production d'un feuillard à chaud à partir d'un acier ferritique non transformé, dans lequel une matière fondue est coulée en un préfeuillard et celui-ci est ensuite laminé en un feuillard à chaud
    caractérisé en ce que
    la matière fondue est coulée à écoulement calmé et sans flexion dans une installation de coulée en bande horizontale en un préfeuillard d'une épaisseur entre 6 et 20 mm et ensuite laminée en un feuillard à chaud avec un taux de déformation d'au moins 50 %.
  2. Procédé selon la revendication 1
    caractérisé en ce que
    la vitesse d'avance de la matière fondue est égale à la vitesse de la bande transporteuse circulante.
  3. Procédé selon les revendications 1 et 2
    caractérisé en ce
    qu'à peu près les mêmes conditions de refroidissement sont réunies pour tous les éléments de surface de l'enveloppe de barre se formant au début de la solidification d'une bande s'étendant sur la largeur de la bande transporteuse.
  4. Procédé selon l'une quelconque des revendications 1 - 3
    caractérisé en ce
    que la matière fondue déposée sur la bande transporteuse est en grande partie complètement solidifiée à la fin de la bande transporteuse.
  5. Procédé selon les revendications 1 et 4
    caractérisé en ce
    qu'après la solidification complète et avant le laminage, le préfeuillard traverse une zone d'homogénéisation.
  6. Procédé selon les revendications 1 et 5
    caractérisé en ce
    qu'avant le laminage, un pliage du préfeuillard a lieu.
  7. Procédé selon la revendication 6
    caractérisé en ce
    qu'après le pliage, les panneaux sont chauffés à la température de laminage et sont ensuite soumis au processus de laminage.
  8. Procédé selon les revendications 1 et 5
    caractérisé en ce
    qu'avant le laminage, un bobinage du préfeuillard a lieu.
  9. Procédé selon la revendication 8
    caractérisé en ce
    qu'après le débobinage, le préfeuillard est chauffé à la température de laminage et est ensuite soumis au processus de laminage.
  10. Procédé selon la revendication 9
    caractérisé en ce
    que le préfeuillard est réchauffé avant le débobinage.
  11. Procédé selon les revendications 1 et 5
    caractérisé en ce
    que le préfeuillard est soumis en ligne au processus de laminage et est ensuite bobiné.
  12. Procédé selon les revendications 1, 7, 9 et 11
    caractérisé en ce
    que le taux de déformation lors du laminage à chaud est > 70 %.
  13. Procédé de production d'un feuillard à chaud à partir d'un acier ferritique non transformé selon l'une quelconque des revendications 1 à 12,
    caractérisé en ce
    qu'il présente une composition chimique en % massique
    < 1,5 C ; < 30 Cr ; >2 Al ; < 30 Mn ; < 5Si, des résidus de fer y compris des impuretés inévitables de l'acier.
  14. Procédé selon la revendication 13,
    caractérisé en ce
    qu'il présente une granulométrie moyenne > 6 ASTM.
  15. Procédé selon les revendications 13 et 14,
    caractérisé en ce
    que l'acier ferritique non transformé présente une composition chimique en % massique
    < 1,5 C ; < 30 Cr ; >5 Al, des résidus de fer y compris des impuretés inévitables de l'acier.
  16. Procédé selon les revendications 13 ou 15,
    caractérisé en ce
    que l'acier ferritique non transformé contient en option un ou plusieurs éléments de précipitation de type B, Ta, Zr, Nb, V, Ti, Mo et W représentant un total maximum de 2 % massique.
EP09775845.2A 2009-03-11 2009-03-11 Procédé de production d'un feuillard à chaud par coulée horizontale à partir d'acier ferritique Not-in-force EP2406404B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2009/000328 WO2010102595A1 (fr) 2009-03-11 2009-03-11 Procédé de production d'un feuillard à chaud et feuillard à chaud produit à partir d'acier ferritique

Publications (2)

Publication Number Publication Date
EP2406404A1 EP2406404A1 (fr) 2012-01-18
EP2406404B1 true EP2406404B1 (fr) 2017-08-23

Family

ID=41271848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09775845.2A Not-in-force EP2406404B1 (fr) 2009-03-11 2009-03-11 Procédé de production d'un feuillard à chaud par coulée horizontale à partir d'acier ferritique

Country Status (5)

Country Link
US (1) US8852356B2 (fr)
EP (1) EP2406404B1 (fr)
KR (1) KR101563606B1 (fr)
RU (1) RU2493266C2 (fr)
WO (1) WO2010102595A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011000089A1 (de) * 2011-01-11 2012-07-12 Thyssenkrupp Steel Europe Ag Verfahren zum Herstellen eines warmgewalzten Stahlflachprodukts
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
DE102012013425A1 (de) 2012-07-03 2014-01-09 Salzgitter Flachstahl Gmbh Kontinuierlich arbeitende Bandgieß- und Walzanlage
EP2994548B1 (fr) 2013-05-06 2022-10-26 Salzgitter Flachstahl GmbH Procédé de fabrication de pièces en acier léger
DE102013013407B4 (de) * 2013-08-07 2015-05-28 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung von Schneid- und Zerspanwerkzeugen aus Stahl mit verbesserter Standzeit
DE102015112215A1 (de) * 2015-07-27 2017-02-02 Salzgitter Flachstahl Gmbh Hochlegierter Stahl insbesondere zur Herstellung von mit Innenhochdruck umgeformten Rohren und Verfahren zur Herstellung derartiger Rohre aus diesem Stahl
DE102015112886A1 (de) * 2015-08-05 2017-02-09 Salzgitter Flachstahl Gmbh Hochfester aluminiumhaltiger Manganstahl, ein Verfahren zur Herstellung eines Stahlflachprodukts aus diesem Stahl und hiernach hergestelltes Stahlflachprodukt

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0826787A2 (fr) * 1996-08-27 1998-03-04 Fried. Krupp AG Hoesch-Krupp Acier pour des éléments de construction et son utilisation dans les voitures et pour les revetements de facade
EP1995336A1 (fr) * 2007-05-16 2008-11-26 ArcelorMittal France Acier à faible densité présentant une bonne aptitude à l'emboutissage

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JP3263359B2 (ja) * 1997-04-04 2002-03-04 川崎製鉄株式会社 シートバーの大単重熱間圧延方法
FR2763960B1 (fr) * 1997-05-29 1999-07-16 Usinor Procede de fabrication de bandes minces d'acier inoxydable ferritique, et bandes minces ainsi obtenues
TW496903B (en) * 1997-12-19 2002-08-01 Armco Inc Non-ridging ferritic chromium alloyed steel
AUPR047900A0 (en) * 2000-09-29 2000-10-26 Bhp Steel (Jla) Pty Limited A method of producing steel
DE10060948C2 (de) 2000-12-06 2003-07-31 Thyssenkrupp Stahl Ag Verfahren zum Erzeugen eines Warmbandes aus einem einen hohen Mangan-Gehalt aufweisenden Stahl
DE102004061284A1 (de) * 2003-12-23 2005-07-28 Salzgitter Flachstahl Gmbh Verfahren zum Erzeugen von Warmbändern aus Leichtbaustahl
WO2005061152A1 (fr) * 2003-12-23 2005-07-07 Salzgitter Flachstahl Gmbh Procede pour produire des feuillards a chaud a partir d'un acier leger
JP5062985B2 (ja) * 2004-10-21 2012-10-31 新日鉄マテリアルズ株式会社 加工性に優れた高Ａｌ含有鋼板及びその製造方法
DE102005052774A1 (de) 2004-12-21 2006-06-29 Salzgitter Flachstahl Gmbh Verfahren zum Erzeugen von Warmbändern aus Leichtbaustahl
DE102004062636B4 (de) 2004-12-21 2007-05-24 Salzgitter Flachstahl Gmbh Einrichtung zum horizontalen Bandgießen von Stahl
DE202005021771U1 (de) 2005-12-20 2010-02-18 Salzgitter Flachstahl Gmbh Umformbarer Leichtbaustahl
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DE102005063058B3 (de) * 2005-12-29 2007-05-24 Thyssenkrupp Nirosta Gmbh Verfahren zum Herstellen eines Kaltbands mit ferritischem Gefüge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0826787A2 (fr) * 1996-08-27 1998-03-04 Fried. Krupp AG Hoesch-Krupp Acier pour des éléments de construction et son utilisation dans les voitures et pour les revetements de facade
EP1995336A1 (fr) * 2007-05-16 2008-11-26 ArcelorMittal France Acier à faible densité présentant une bonne aptitude à l'emboutissage

Also Published As

Publication number Publication date
US8852356B2 (en) 2014-10-07
US20120093677A1 (en) 2012-04-19
WO2010102595A1 (fr) 2010-09-16
KR20110126134A (ko) 2011-11-22
KR101563606B1 (ko) 2015-10-27
RU2493266C2 (ru) 2013-09-20
EP2406404A1 (fr) 2012-01-18
RU2011141085A (ru) 2013-04-20

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