EP1969151B1 - Procede de fabrication d´un acier de construction leger deformable - Google Patents

Procede de fabrication d´un acier de construction leger deformable Download PDF

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Publication number
EP1969151B1
EP1969151B1 EP06818103.1A EP06818103A EP1969151B1 EP 1969151 B1 EP1969151 B1 EP 1969151B1 EP 06818103 A EP06818103 A EP 06818103A EP 1969151 B1 EP1969151 B1 EP 1969151B1
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EP
European Patent Office
Prior art keywords
content
connecting line
value pairs
manufacturing
alloy
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.)
Revoked
Application number
EP06818103.1A
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German (de)
English (en)
Other versions
EP1969151A1 (fr
Inventor
Karl-Heinz Spitzer
Hellfried Eichholz
Bianca Springub
Rune SCHMIDT-JÜRGENSEN
Markus SCHÄPERKÖTTER
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Salzgitter Flachstahl GmbH
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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
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Application filed by Salzgitter Flachstahl GmbH filed Critical Salzgitter Flachstahl GmbH
Publication of EP1969151A1 publication Critical patent/EP1969151A1/fr
Application granted granted 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
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • 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
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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 method for producing a deformable lightweight structural steel with TRIP (Transformation Induced Plasticity) and TWIP (Twinning Induced Plasticity) properties according to the preamble of Claim 1.
  • Formable lightweight steels of this type are known ( DE 10 2004 061 284 A1 . DE 197 27 759 A1 . DE 101 285 44 A1 ). In the case of these and comparable steels, in the presence of residual stresses in the material, depending on the microstructure and the strength, a hydrogen-induced delayed embrittlement and as a result cracking may occur.
  • the object of the invention is to provide a method for producing a lightweight steel of the generic type, which does not have the effect of a delayed hydrogen embrittlement while maintaining very good mechanical properties (ductility, strength).
  • the problem mentioned in the problem is solved by a new alloy concept.
  • This is characterized in that a lower C content is assigned to a lower Mn content and a lower C content to a higher Mn content, the C-Mn value pairs in a C-Mn coordinate system being approximately at a straight connecting line which has a distance to the connecting line of equilibrium between ⁇ - (austenite-kfz) and ⁇ '-phases (martensite-krz) located C-Mn value pairs.
  • This new alloy concept makes use of the knowledge that the ⁇ -austenite (kfz) and the ⁇ -martensite (hdp) phase have a high hydrogen solubility while the ⁇ '-martensite (krz) phase has a much lower hydrogen solubility having.
  • TRIP effect occurs, depending on the alloy composition, formation of the ⁇ '-martensite phase, e.g. via the metastable ⁇ -martensite phase.
  • the densely packed ⁇ -Martensit phase can be present on the principle of least constraint even after the deformation and fold down on discharge in the ⁇ '-martensite phase.
  • the carbon content is a crucial element in the proposed alloy concept because it stabilizes the austenite phase and displaces the hydrogen from the free lattice sites.
  • alloys with 0.7% C, 15% Mn, 2.5% Al, 2.5% Si such as 0.4% C, 18% Mn, 2.5% Al, 2.5% Si in addition to excellent mechanical properties, as indicated below, no delayed fracture on.
  • the first alloy example After annealing at 850 ° C, the first alloy example has a yield strength R p0.2 of 480 MPa and a strength of 850 MPa with an elongation A of 58%. These values for the second alloy example also after annealing at 850 ° C are Rp 0.2 450 MPa; R m 790 MPa and A 53%.
  • a second parameter is the product of strength x elongation, which is a measure of the material's performance. This value is 49,300 for alloy example 1 and 41,870 (% x MPa) for example 2.
  • the C content is plotted against the Mn content in a coordinate system.
  • the solid straight connecting line shows the C-Mn value pairs which are in balance with respect to the ⁇ -austenite and the ⁇ '-martensite phase taking into account Al and / or Si addition.
  • the dashed connecting line which is at a distance from the equilibrium line, identifies value pairs of the optimal alloy concept, with regard to material properties while avoiding delayed fracture.
  • the shading applied over the dashed connecting line is intended to indicate the qualitative scattering band within which optimum results are still to be expected.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (3)

  1. Procédé de fabrication d'un acier de construction léger déformable ayant des caractéristiques TRIP et TWIP qui, en conservant les caractéristiques mécaniques de ductilité et de résistance, ne présente pas d'effet de fragilisation retardée due à l'hydrogène, l'alliage présentant les éléments en %-poids C de 0,05 à ≤ 1,0 Al de 0,0 à ≤ 11,0 Si de 0,0 à ≤ 6,0 Al + Si > 0,05 Mn de 9,0 à ≤ 25,0 H < 20 ppm, le reste étant du fer, y compris des éléments accompagnant habituellement l'acier, différentes phases étant présentes en fonction de la composition de l'alliage,
    caractérisé en ce
    qu'une teneur en C plus élevée est affectée à une teneur Mn plus faible, et une teneur en C plus faible est affectée à une teneur en Mn plus élevée, les paires de valeurs C-Mn
    0,7C/15Mn, 2,5% Al, 2,5% Si et 0,4C/18Mn, 2,5% Al, 2,5% Si étant, dans un système de coordonnées C-Mn, situées de façon approchée sur une ligne de jonction droite qui présente un écart à la ligne de jonction de paires de valeurs C-Mn situées en équilibre entre des phases γ-(austénite) et α'-(martensite), et en ce que la bande de dispersion autour de la ligne de jonction des paires de valeurs C-Mn optimales est ± 0,15% pour la teneur en C et ± 2,5% pour la teneur en Mn.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    l'addition dé Al et de Si est approximativement d'importance égale.
  3. Procédé selon les revendications 1 - 2,
    caractérisé en ce que
    la bande de dispersion est ± 0,1% pour la teneur en C et ± 1,5% pour la teneur en Mn.
EP06818103.1A 2005-12-20 2006-11-22 Procede de fabrication d´un acier de construction leger deformable Revoked EP1969151B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005062221A DE102005062221B3 (de) 2005-12-20 2005-12-20 Umformbarer Leichtbaustahl
PCT/DE2006/002081 WO2007076748A1 (fr) 2005-12-20 2006-11-22 Acier de construction leger deformable

Publications (2)

Publication Number Publication Date
EP1969151A1 EP1969151A1 (fr) 2008-09-17
EP1969151B1 true EP1969151B1 (fr) 2014-02-26

Family

ID=37814445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06818103.1A Revoked EP1969151B1 (fr) 2005-12-20 2006-11-22 Procede de fabrication d´un acier de construction leger deformable

Country Status (10)

Country Link
US (1) US20090196785A1 (fr)
EP (1) EP1969151B1 (fr)
KR (1) KR20080081969A (fr)
CN (1) CN101405420A (fr)
AU (1) AU2006332301B2 (fr)
DE (2) DE202005021771U1 (fr)
RU (1) RU2430184C2 (fr)
UA (1) UA88994C2 (fr)
WO (1) WO2007076748A1 (fr)
ZA (1) ZA200805306B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108707817A (zh) * 2018-05-02 2018-10-26 北京科技大学 一种挖掘机斗齿及具有该斗齿的挖掘机

Families Citing this family (17)

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DE102008056844A1 (de) 2008-11-12 2010-06-02 Voestalpine Stahl Gmbh Manganstahlband und Verfahren zur Herstellung desselben
EP2208803A1 (fr) * 2009-01-06 2010-07-21 ThyssenKrupp Steel Europe AG Acier à résistance élevée, formable à froid, produit plat en acier, procédé de fabrication d'un produit plat en acier et utilisation du produit plat en acier
RU2493266C2 (ru) 2009-03-11 2013-09-20 Зальцгиттер Флахшталь Гмбх Способ изготовления горячекатаной полосы и изготовленная из ферритной стали горячекатаная полоса
DE102010034161B4 (de) 2010-03-16 2014-01-02 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung von Werkstücken aus Leichtbaustahl mit über die Wanddicke einstellbaren Werkstoffeigenschaften
DE102011117135A1 (de) * 2010-11-26 2012-05-31 Salzgitter Flachstahl Gmbh Energie speicherndes Behältnis aus Leichtbaustahl
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
US10001228B2 (en) 2011-06-17 2018-06-19 National Oilwell Varco Denmark I/S Unbonded flexible pipe
DE112013001144A5 (de) * 2012-02-25 2014-10-30 Technische Universität Bergakademie Freiberg Verfahren zur Herstellung hochfester Formteile aus hochkohlenstoff- und hochmanganhaltigem austenitischem Stahlguss mit TRIP/TWIP-Eigenschaften
DE102012013425A1 (de) 2012-07-03 2014-01-09 Salzgitter Flachstahl Gmbh Kontinuierlich arbeitende Bandgieß- und Walzanlage
KR101749201B1 (ko) 2013-05-06 2017-06-20 잘쯔기터 플래시슈탈 게엠베하 경량 강으로 부품을 제조하기 위한 방법
CN103667883B (zh) * 2013-12-26 2017-01-11 北京科技大学 一种低密度、高强韧汽车用钢板及制备工艺
CN103667885B (zh) * 2013-12-31 2015-11-25 深圳市晶莱新材料科技有限公司 一种用于医学领域含Pt纳米孪晶钢及其制备方法
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
CN107475618B (zh) * 2017-07-11 2019-02-26 西南交通大学 一种高强韧低碳含铝中锰形变诱发塑性钢及制备方法
CN113549840A (zh) * 2021-06-29 2021-10-26 鞍钢股份有限公司 一种780MPa级的高强塑积Fe-Mn-Al-C系轻质钢及其制备方法
CN115216703B (zh) * 2022-06-24 2023-02-28 燕山大学 一种超高强度低密度钢及其制备方法
CN116356233A (zh) * 2023-04-11 2023-06-30 重庆大学 一种利用形变孪晶提高锆合金抗氢脆性能的方法

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JPH05255813A (ja) * 1991-12-24 1993-10-05 Nippon Steel Corp 加工性と制振性能に優れた高強度合金
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108707817A (zh) * 2018-05-02 2018-10-26 北京科技大学 一种挖掘机斗齿及具有该斗齿的挖掘机
CN108707817B (zh) * 2018-05-02 2020-10-09 北京科技大学 一种挖掘机斗齿及具有该斗齿的挖掘机

Also Published As

Publication number Publication date
ZA200805306B (en) 2009-04-29
CN101405420A (zh) 2009-04-08
AU2006332301A1 (en) 2007-07-12
RU2430184C2 (ru) 2011-09-27
AU2006332301B2 (en) 2011-07-28
UA88994C2 (ru) 2009-12-10
WO2007076748A1 (fr) 2007-07-12
KR20080081969A (ko) 2008-09-10
DE202005021771U1 (de) 2010-02-18
EP1969151A1 (fr) 2008-09-17
US20090196785A1 (en) 2009-08-06
RU2008129694A (ru) 2010-01-27
DE102005062221B3 (de) 2007-05-03

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