EP1430161B1 - Acier duplex/triplex a resistance elevee pour construction legere et son utilisation - Google Patents

Acier duplex/triplex a resistance elevee pour construction legere et son utilisation Download PDF

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Publication number
EP1430161B1
EP1430161B1 EP02800111A EP02800111A EP1430161B1 EP 1430161 B1 EP1430161 B1 EP 1430161B1 EP 02800111 A EP02800111 A EP 02800111A EP 02800111 A EP02800111 A EP 02800111A EP 1430161 B1 EP1430161 B1 EP 1430161B1
Authority
EP
European Patent Office
Prior art keywords
structural steel
strength
lightweight structural
steel according
steel
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
EP02800111A
Other languages
German (de)
English (en)
Other versions
EP1430161A2 (fr
Inventor
Konrad Eipper
Georg Frommeyer
Wolfgang Fussnegger
Arndt Gerick
Wolfgang KLEINEKATHÖFER
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler 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
Priority claimed from DE10231125A external-priority patent/DE10231125A1/de
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1430161A2 publication Critical patent/EP1430161A2/fr
Application granted granted Critical
Publication of EP1430161B1 publication Critical patent/EP1430161B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C21D2211/005—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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, 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 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys

Definitions

  • the invention relates to a high-strength and very deep-drawable Duplex or Triplex lightweight steel and its Use.
  • High strength steel is used for the automotive industry, construction industry as well as in aerospace applications with different Properties developed and already in production used. This is especially in use in the Automobile industry increasingly the desire in the foreground, through new materials a weight reduction of the vehicle make.
  • the aim is to produce lighter ones Steel alloys, which otherwise the previous favorable Maintain or improve properties.
  • the austenitic or austenitic / ferritic Lightweight steel a composition on with 7-27 Wt% Mn, 1-10 wt% Al, less than 10 wt% Cr, less than 10% by weight of Ni, more than 0.7-4% by weight of Si, less than 3 Wt .-% Cu, less than 0.5 wt .-% C and a remainder Composition of iron and melting Impurities.
  • the other alloy components can from small amounts of nitrogen, niobium, titanium, vanadium and Phosphorus exist.
  • the known lightweight structural steels listed above have Although important advantageous properties for use in the these technology areas, but they are with significant disadvantages. Further weight savings, For example, in the auto industry, can be with the known steels only by further reducing the Sheet thickness or by additional design measures to reach. Good formability, d. H. deep and stretchable, cold-rolled and recrystallizing annealed deep drawing steels higher aluminum content, as they are especially for the application are needed in the automotive industry, are due to a still to high specific gravity from the state of the Technique not known in this form.
  • EP-A-414 949 describes an ⁇ - ⁇ duplex lightweight steel having a composition similar that of the invention, but with lower Si content and without Mg and / or Ga and / or Be contents.
  • the invention is based on the object, a good kaltumformbaren, especially good deep drawing and stretchable high strength Lightweight steel to create its density under the specific density of previously known steels.
  • the lightweight structural steel according to the invention is formed from a multi-phase structure in the case of duplex steel made of ⁇ -ferrite and ⁇ -austenite mixed crystals.
  • a martensitic ⁇ -phase and / or ⁇ -phase is added to the first two phases.
  • the specific weight of the steel according to the invention is lowered to low values by the high proportions of the light alloying elements Al, Si, C and Mn and at least one of the elements Mg, Ga, Be and optionally Ti. With both alloys, a density of less than 7 g / cm 3 is achieved, which is significantly reduced by up to 15% compared to conventional steels with values of between 7.3 and 7.5 g / cm 3 .
  • the solution according to the invention has a further reduction in density.
  • the lightweight steel according to the invention achieved by the Element Mg, as far as it is present in the alloy, a further lowering its density, due to the very low specific gravity of Mg.
  • Be as far as it is present in the alloy, here additionally still an increase in the strength is achieved, which under Maintaining the Dukltiltician is achievable.
  • the element Ti is, if it is present in the alloy, another Increase in strength through grain refining and mixed critical hardening reached.
  • the element Ga serves, provided it is in the alloy exists, increasing strength and hardness. In addition, it increases the castability of the alloy, since these by the proportion of Ga at comparable Temperature conditions becomes more fluid.
  • the inventive duplex or triplex lightweight steel is characterized in the cold-rolled and recrystallized state by a fine-grained two- or three-phase structure with equiaxial i. isotropic morphology of ⁇ -ferrite, ⁇ -austenite or ⁇ -martensite grains.
  • This lightweight steel behaves with respect to a planar change in shape during Deep and ironing quasi-isotropic ( ⁇ r ⁇ 0).
  • the respective fine-grained two- or three-phase structure increases the energy absorption - the dissipative energy - of this steel when subjected to high strain rate, as they are for example, by impact load or in the event of a crash occurs.
  • the lightweight steel is characterized by yield stresses of over 400 MPa. Due to a high solidification due to strong Interaction of the displacements of the coexisting ⁇ / ⁇ or ⁇ / ⁇ / ⁇ ( ⁇ ) phases become tensile strengths on the hot strip of up to Achieved 1000 MPa and uniform expansions up to 40% as well maximum strains up to 50% achieved.
  • the recrystallizing annealed cold-rolled strip has strengths in the range of 900 MPa maximum strains of 70%.
  • the lightweight construction steel according to the invention also indicates that known from the prior art Lightweight steels with aluminum components one not yet Known density reduction on.
  • Another advantage of the solution according to the invention is that, despite its high strength, the material is a very has good formability. These properties have been so far only achieved with high-alloyed stainless steels. Especially also worth mentioning is its pourability during processing, which, as already mentioned, in the presence of Ga is improved again.
  • the ⁇ / ⁇ -duplex or ⁇ / ⁇ / ⁇ ( ⁇ ) -triplex Lightweight steel is another improvement in the Combination of previously unknown advantageous properties result.
  • the lightweight steel Due to the high proportion of alloy components with one specific gravity below the specific weight of Iron and previously known lightweight steels will be one for the Auto industry advantageous weight reduction while maintaining achieved the previous design construction.
  • the lightweight steel has an excellent Ductility, high strength and extremely high Solidification rate on. To emphasize is the property of a high load speed in crash behavior at a Accident, making this steel alloy especially for the Motor vehicle construction is suitable. Furthermore, there is an increased Corrosion and in particular stress cracking corrosion resistance, so that this steel alloy is also suitable for use in other technological fields such as construction suitable.
  • d. H. especially as prestressed concrete steels and Monierisen (- steels) or crash barriers and Sheet piling can be the lightweight steels of the invention excellent use.
  • the corrosion resistance can in others by chemical, electrochemical, organic, non-metallic or metallic coatings are improved.
  • a protective cover layer can thereby be achieved be that the surface enriched with aluminum and / or is coated.
  • the deep and stretchable aluminum-containing steel is used in the Production process melted, in the continuous casting process potted, rolled in the temperature range above the Recrystallization temperature or by casting, thin strip casting preferably, poured off as near-net-near band.
  • the steel can either be processed directly as a hot strip or cold-rolled after hot rolling.
  • the lightweight structural steel according to the invention is suitable in particular for the production of components for body shell components / body, Integral beams, suspension structures and space Frames.
  • Other lightweight components in motor vehicles are steering, Axles and axle components, attachments, seat rails, Fasteners and systems for passive safety, Wheel suspensions, driveline and fuel tank.
  • the scope extends to rail and Watercraft and aerospace, there preferably in thin-walled stiffness-relevant components.
  • the material is also suitable for Conveying systems, conveyor belts and metallurgy.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Body Structure For Vehicles (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (8)

  1. Acier léger de construction duplex α/γ ou triplex α/γ/ε à haute résistance avec la composition suivante (teneurs en pour-cent en poids) :
    18 à 35 % de Mn,
    8 à 12 % de Al,
    3 à 6 % de Si, Al + Si étant > 12 %,
    0,5 à 2 % de C,
    au maximum 0,05 % de B,
    au maximum 3 % de Ti,
    au moins l'un des éléments Mg, Ga, Be avec une teneur de 0,3 jusqu'à 3 % à chaque fois,
    le reste étant essentiellement constitué de fer, y compris les éléments usuels accompagnateurs de l'acier.
  2. Acier léger de construction à haute résistance selon la revendication 1, caractérisé par une teneur en Ti de 0,03 à 2 %.
  3. Acier léger de construction à haute résistance selon l'une quelconque des revendications 1 ou 2, caractérisé par les teneurs suivantes en autres éléments d'alliage
    jusqu'à 0,3 % de N
    jusqu'à 0,5 % de Nb
    jusqu'à 0,5 % de V
  4. Acier léger de construction à haute résistance selon l'une quelconque des revendications 1 ou 3, caractérisé par une structure duplex biphasique α/γ à grain fin ou par une structure triplex triphasique α/γ/ε à grain fin comportant une morphologie équiaxiale à l'état laminé à froid ou à l'état recristallisé.
  5. Acier léger de construction à haute résistance selon l'une quelconque des revendications 1 ou 4, caractérisé par une isotropie planaire avec r ≈ 1, c'est-à-dire un acier qui présente dans le plan de la tôle des propriétés mécaniques à peu près isotropes en ce qui concerne la résistance et l'allongement.
  6. Fabrication d'un composant en acier léger de construction à haute résistance selon l'une quelconque des revendications 1 à 5 au moyen d'un procédé de coulage.
  7. Utilisation d'un acier léger de construction selon l'une quelconque des revendications 1 à 5, comme matière pour des composants de coque ou de carrosserie, pour des poutres intégrales, structures de châssis ou châssis multitubulaire dans le cas de véhicules.
  8. Utilisation d'un acier léger de construction selon l'une quelconque des revendications 1 à 5, comme matière pour des bâtiments, installations de transport, la métallurgie, ainsi que pour des glissières de sécurité et des palplanches.
EP02800111A 2001-09-28 2002-09-25 Acier duplex/triplex a resistance elevee pour construction legere et son utilisation Expired - Lifetime EP1430161B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10148101 2001-09-28
DE10148101 2001-09-28
DE10231125A DE10231125A1 (de) 2001-09-28 2002-07-10 Hochfester Duplex-/Triplex-Leichtbaustahl und seine Verwendung
DE10231125 2002-07-10
PCT/EP2002/010679 WO2003029504A2 (fr) 2001-09-28 2002-09-25 Acier duplex/triplex a resistance elevee pour construction legere et son utilisation

Publications (2)

Publication Number Publication Date
EP1430161A2 EP1430161A2 (fr) 2004-06-23
EP1430161B1 true EP1430161B1 (fr) 2005-06-15

Family

ID=26010254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02800111A Expired - Lifetime EP1430161B1 (fr) 2001-09-28 2002-09-25 Acier duplex/triplex a resistance elevee pour construction legere et son utilisation

Country Status (6)

Country Link
US (1) US20070125454A1 (fr)
EP (1) EP1430161B1 (fr)
JP (1) JP2005504175A (fr)
AT (1) ATE298009T1 (fr)
ES (1) ES2242899T3 (fr)
WO (1) WO2003029504A2 (fr)

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DE102005017929A1 (de) * 2005-04-18 2006-10-19 Friedr. Fingscheidt Gmbh Verwendung eines Leichtbaustahls
DE102005057599A1 (de) * 2005-12-02 2007-06-06 Volkswagen Ag Leichtbaustahl
DE202005021771U1 (de) * 2005-12-20 2010-02-18 Salzgitter Flachstahl Gmbh Umformbarer Leichtbaustahl
DE102006030699B4 (de) * 2006-06-30 2014-10-02 Daimler Ag Gegossener Stahlkolben für Verbrennungsmotoren
BRPI0716582A2 (pt) * 2006-08-23 2013-10-08 Neurogen Corp Análogos de 2-fenóxi pirimidinona
DE102008020757A1 (de) 2007-04-30 2008-11-06 Volkswagen Ag Verfahren zur Umformung von Blechwerkstücken aus Eisen-Mangan-Stahl
WO2010052751A1 (fr) 2008-11-05 2010-05-14 Honda Motor Co., Ltd. Tôle d'acier a haute resistance et procede de production associe
WO2010052052A1 (fr) * 2008-11-07 2010-05-14 Siemens Aktiengesellschaft Rotor pour une turbomachine
US20120121452A1 (en) * 2009-03-11 2012-05-17 Salzgitter Flachstahl Gmbh Method for producing a hot rolled strip and hot rolled strip produced from triplex lightweight steel
US20120067492A1 (en) * 2010-09-22 2012-03-22 Yann Bernard Duval Tires with high strength reinforcement
DE102011117135A1 (de) 2010-11-26 2012-05-31 Salzgitter Flachstahl Gmbh Energie speicherndes Behältnis aus Leichtbaustahl
RU2625512C2 (ru) * 2015-12-03 2017-07-14 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский технологический университет "МИСиС" Конструкционная литейная аустенитная стареющая сталь с высокой удельной прочностью и способ ее обработки
RU2652935C1 (ru) * 2016-11-28 2018-05-03 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский технологический университет "МИСиС" Конструкционная литейная и деформируемая микролегированная азотом аустенитная теплостойкая криогенная сталь с высокой удельной прочностью и способ ее обработки
RU2652934C1 (ru) * 2016-11-28 2018-05-03 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский технологический университет "МИСиС" Конструкционная деформируемая аустенитная немагнитная теплостойкая криогенная сталь с высокой удельной прочностью и способ ее обработки
US11530468B2 (en) 2018-06-12 2022-12-20 The Trustees Of Dartmouth College High-entropy alloys with high strength

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DE102005027258B4 (de) * 2005-06-13 2013-01-31 Daimler Ag Hochkohlenstoffhaltiger Stahl mit Superplastizität

Also Published As

Publication number Publication date
ES2242899T3 (es) 2005-11-16
ATE298009T1 (de) 2005-07-15
WO2003029504A2 (fr) 2003-04-10
JP2005504175A (ja) 2005-02-10
US20070125454A1 (en) 2007-06-07
WO2003029504A3 (fr) 2003-11-27
EP1430161A2 (fr) 2004-06-23

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