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EP1963542A1 - Acier de construction leger - Google Patents

Acier de construction leger

Info

Publication number
EP1963542A1
EP1963542A1 EP06777081A EP06777081A EP1963542A1 EP 1963542 A1 EP1963542 A1 EP 1963542A1 EP 06777081 A EP06777081 A EP 06777081A EP 06777081 A EP06777081 A EP 06777081A EP 1963542 A1 EP1963542 A1 EP 1963542A1
Authority
EP
European Patent Office
Prior art keywords
weight
triplex
strength
lightweight steel
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.)
Ceased
Application number
EP06777081A
Other languages
German (de)
English (en)
Inventor
Jürgen Kiese
Martin Glatzer
Udo BRÜX
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.)
Volkswagen AG
Original Assignee
Volkswagen 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
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP1963542A1 publication Critical patent/EP1963542A1/fr
Ceased legal-status Critical Current

Links

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
    • C22C38/04—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

Definitions

  • the present invention relates to a high-strength ⁇ / ⁇ / ⁇ triplex lightweight steel and its use.
  • the present invention relates to a method for producing a high-strength ⁇ / ⁇ / ⁇ -triplex-l-lightweight steel.
  • DE 1 262 613 B1 discloses the use of a lightweight steel with high strength, wear resistance and relatively low weight as a material for aircraft components.
  • the lightweight steel known from this publication has high proportions of light alloy components with 4 to 20 wt.% Al, 18 to 40 wt.% Mn and 0.15 to 2 wt.
  • this lightweight steel can also have 0 to 4% by weight of Nb and 0 to 3% by weight of Si.
  • the lightweight steel can also contain up to 2% by weight of boron, up to 2% by weight of cerium and up to 10% by weight of cobalt, nickel, molybdenum, tungsten, vanadium, copper, tantalum, titanium, zirconium and bis contain 5 wt .-% chromium.
  • a disadvantage of this lightweight steel is that the proportion is relatively heavier, so that this steel has a comparatively high specific density.
  • the lightweight steel also has relatively high proportions of very expensive microalloying elements (in particular Nb). Furthermore, relatively high proportions of microalloying elements can possibly have a negative impact on the theological properties of lightweight steel.
  • ⁇ / ⁇ / ⁇ triplex lightweight steel is known.
  • This lightweight steel is a three-phase structure, which is formed from ⁇ -ferrite, y-austenite and a martensitic ⁇ phase. Because of these three phases, this lightweight steel is also called ⁇ / ⁇ / ⁇ triplex lightweight steel.
  • the ⁇ / ⁇ / ⁇ triplex lightweight structural steel known from this publication has the following composition (in% by weight):
  • Further alloying elements can be Ti (0.03-2% by weight), N ( ⁇ 0.3% by weight), Nb ( ⁇ 0.5% by weight) and V ( ⁇ 0.5% by weight) ) be.
  • a disadvantage of this ⁇ / ⁇ / ⁇ lightweight steel consists in the comparatively high proportions of Si and / or Mg and / or Ga and / or Be, which can have a disadvantageous effect on its rheological properties.
  • a disadvantage of the lightweight steels known from the prior art is that their rheological properties are not balanced for numerous areas of application.
  • the known steels often have too little elongation for a given tensile strength or an insufficient tensile strength for a given elongation.
  • the present invention is based on the object of providing a high-strength ⁇ / ⁇ / ⁇ triplex lightweight structural steel which has more balanced rheological properties, in particular a higher strength with a higher elongation at a low specific weight.
  • Ti, Nb, Cr, V, N, B with a content of less than 1% by weight in total and individually less than 0.5% by weight
  • the ⁇ / ⁇ / ⁇ -triplex lightweight steel which comprises an ⁇ -ferrite phase, a ⁇ -austenite phase and a ⁇ -carbide phase, is characterized in particular by the fact that the microalloying elements Ti, Nb, Cr, V, N, B are only present with a content of less than 1% by weight in total.
  • a further characteristic of the ⁇ / ⁇ / ⁇ triplex lightweight structural steel is that the microalloying elements Ti, Nb, Cr, V 1 N, B are individually present with a content of less than 0.5% by weight.
  • the low content of the microalloying elements Ti, Nb 1 Cr, V, N, B has a positive effect on the theological properties of the ⁇ / ⁇ / ⁇ triplex lightweight structural steel.
  • the ⁇ / ⁇ / ⁇ triplex lightweight structural steel has a greater elongation for a given tensile strength or a greater tensile strength for a given elongation than the lightweight steels known from the prior art.
  • the ⁇ / y / ⁇ triplex lightweight structural steel has a specific density of 6.5-7.2 g / cm 3 .
  • the ⁇ / ⁇ / ⁇ triplex lightweight structural steel has a lower density than the steels used for motor vehicle components, which usually have a specific density of approximately 7.3-7.8 g / cm 3 .
  • the high-strength ⁇ / ⁇ / ⁇ triplex lightweight steel has 25-35% by weight Mn.
  • the ⁇ / ⁇ / ⁇ triplex lightweight structural steel has 8 to 12% by weight, in particular approximately 10% by weight, of aluminum.
  • the ⁇ / ⁇ / ⁇ triplex lightweight steel has 1 to 1.3% by weight of C.
  • the ⁇ / ⁇ / ⁇ triplex lightweight steel has an Nb content of less than 0.5% by weight, in particular less than 0.3% by weight. -%, preferably less than 0.1 wt .-%.
  • the 0.2% proof stress R p0 , 2 is the stress at which the material sample has a permanent elongation of 0.2% after the relief.
  • a 80 denotes the elongation at break standardized to a sample length of 80 mm.
  • the inventive method for producing a high strength ⁇ / ⁇ / ⁇ -triplex lightweight structural steel is characterized according to claim 8 characterized in that the ⁇ / ⁇ / ⁇ -triplex lightweight structural steel at a temperature of about 300 0 C to about 700 0 C, preferably is stored at a temperature of about 550 0 C.
  • Investigations have shown that the rheological properties of the ⁇ / ⁇ / ⁇ triplex lightweight steel can be adapted to the respective requirements by aging in the temperature range between approximately 300 ° C. to 700 ° C. It has also been shown that the rheological properties of the ⁇ / v / K triplex lightweight steel can be adjusted by different aging times.
  • a use of a high-strength ⁇ / ⁇ / ⁇ triplex lightweight steel, which is produced according to claim 8, is proposed for a motor vehicle component.
  • the rheological properties of the motor vehicle component can be specifically varied and adapted by aging before or after its manufacture.
  • another parameter to influence the rheological properties of the motor vehicle component is the aging time.
  • the ⁇ / ⁇ / ⁇ -triplex lightweight steel is characterized, among other things, by the fact that the microalloying elements Ti, Nb, Cr, V, N, B are present in total with a content of less than 1% by weight.
  • the ⁇ / ⁇ / ⁇ triplex preferably has Lightweight steel has a specific density of 6.5 - 7.2 g / cm 3 and therefore has a relatively low specific density compared to conventional steels.
  • a stress-strain diagram of the three-phase high-strength ⁇ / ⁇ / ⁇ lightweight structural steel Fe-26Mn-11AI-1, 1 C is shown.
  • the stress ⁇ (in MPa) is plotted against the relative strain ⁇ (in%) with different aging times. It can be seen that the theological properties of the ⁇ / ⁇ / ⁇ triplex lightweight steel, in particular the 0.2% proof stress R p o, 2 or the tensile strength R m and the elongation at break A 80 can be modified in a targeted manner by the different aging times.
  • the reference value for the elongation at break A 80 is an initial measuring length of 80 mm (tensile test DIN 50125 - H20x80).
  • the elongation at break A 80 is approx. 63%. It can be seen that the elongation at break A 80 with an aging time of 2.1 minutes is in the range of about 66% and is therefore slightly increased compared to the sample that has not been aged.
  • the tensile strength R m that is the maximum tensile stress that occurs in the sample, is essentially identical in both cases at about 900 MPa. A relatively short aging time therefore hardly affects the tensile strength R m and increases the elongation at break A 80 slightly.
  • the elongation at break is already on the order of about 32%. It can be seen that, after a relatively short aging time, the elongation at break A 80 is almost halved compared to the sample that has not been aged.
  • the tensile strength R m is on the order of approximately 990 MPa. It can be seen that the maximum stress (tensile strength R m ) with a lower relative elongation ⁇ ⁇ 2% occurs than in the sample that was not outsourced or only outsourced for a short time. This tendency can also be seen in samples that have been stored for even longer.
  • the elongation at break A 8O is only about 10%.
  • the mechanical stress in the plastic region of the stress-strain curve increases as the aging takes longer.
  • the ⁇ / ⁇ / ⁇ triplex lightweight steel thus becomes harder with increasing aging time.
  • the tensile strength is over 1100 MPa.
  • the elongation at break A 80 is then below 3%.
  • this stress is approximately 800 MPa with an aging time of 4.6 minutes, whereas it exceeds 1000 MPa with aging times of 210 minutes and longer.
  • theological properties of the ⁇ / y / ⁇ triplex lightweight steel can be adjusted both before and after the component is generated by the targeted heating.
  • the swapping may be performed at the production of the ⁇ / ⁇ / ⁇ triplex lightweight structural steel preferably in a temperature range between about 300 ° C to about 700 0 C, with a paging at a temperature in the order of between 500 0 C and 600 0 C particularly is preferred.
  • MN 15-40% by weight
  • AI 5-15% by weight
  • Si 0-3% by weight
  • C 0.5-2% by weight
  • Fe rest.
  • the ⁇ / ⁇ / ⁇ triplex lightweight structural steel comprises the microalloying elements Ti, Nb 1 Cr, V, N, B with proportions, the sum of which is less than 1% by weight, and each individually a proportion of less than 0 , 5% by weight.
  • the lightweight steel preferably has a manganese content of between approximately 25-35% by weight. It is preferred that the aluminum content is about 10% by weight and the carbon content is between 1 and about 1.3% by weight.
  • the ⁇ / ⁇ / ⁇ triplex lightweight structural steel therefore preferably has an Nb content of less than 0.5% by weight, in particular less than 0.3% by weight, preferably less than 0.1% by weight. on.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

La présente invention concerne un acier de construction léger triplexe a/?/? ayant la composition suivante: 15 - 40 % en poids de Mn, 5 - 15 % en poids de AI, 0,5 - 2 % en poids de C, 0 - 3 % en poids de Si et enfin Ti, Nb, Cr, V, N, B avec en totalité une teneur inférieure à 1 % en poids et séparément respectivement inférieure à 0,5 % en poids, le reste étant essentiellement du fer.
EP06777081A 2005-12-02 2006-08-26 Acier de construction leger Ceased EP1963542A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510057599 DE102005057599A1 (de) 2005-12-02 2005-12-02 Leichtbaustahl
PCT/EP2006/008384 WO2007062702A1 (fr) 2005-12-02 2006-08-26 Acier de construction leger

Publications (1)

Publication Number Publication Date
EP1963542A1 true EP1963542A1 (fr) 2008-09-03

Family

ID=37199145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06777081A Ceased EP1963542A1 (fr) 2005-12-02 2006-08-26 Acier de construction leger

Country Status (3)

Country Link
EP (1) EP1963542A1 (fr)
DE (1) DE102005057599A1 (fr)
WO (1) WO2007062702A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007059007A1 (de) 2007-12-06 2009-06-18 Salzgitter Flachstahl Gmbh Verfahren zum Erzeugen eines Warmbandes und aus einem Triplex-Leichtbaustahl hergestelltes Warmband
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
US20110076176A1 (en) * 2009-09-28 2011-03-31 General Electric Company Cast compressor articles and methods of forming same
DE102011117135A1 (de) * 2010-11-26 2012-05-31 Salzgitter Flachstahl Gmbh Energie speicherndes Behältnis aus Leichtbaustahl
KR20160064345A (ko) * 2014-11-27 2016-06-08 한국기계연구원 용접부 물성이 우수한 오스테나이트계 경량 고강도 강재 제조 방법
RU2650952C1 (ru) * 2017-12-05 2018-04-18 Юлия Алексеевна Щепочкина Сталь
US11420296B2 (en) * 2020-09-17 2022-08-23 Te-Fu FANG Welding filler wire for fusion welding precipitation-hardened austenitic Fe—Mn—Al—C alloys

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB841366A (en) * 1957-07-02 1960-07-13 Langley Alloys Ltd Improvements in iron aluminium alloys
US3111405A (en) * 1958-06-16 1963-11-19 Langley Alloys Ltd Aluminum-manganese-iron alloys
DE1182844B (de) * 1959-06-23 1964-12-03 Ford Werke Ag Austenitische Stahllegierung
BE600063R (fr) * 1960-02-25 1961-05-29 Langley Alloys Ltd Perfectionnements apportés aux alliages de fer et d'aluminium
GB2220674A (en) * 1988-06-29 1990-01-17 Nat Science Council Alloys useful at elevated temperatures
US4968357A (en) * 1989-01-27 1990-11-06 National Science Council Hot-rolled alloy steel plate and the method of making
DE19610675C1 (de) * 1996-03-19 1997-02-13 Thyssen Stahl Ag Mehrphasenstahl und Verfahren zu seiner Herstellung
DE19727759C2 (de) * 1997-07-01 2000-05-18 Max Planck Inst Eisenforschung Verwendung eines Leichtbaustahls
DE10128544C2 (de) * 2001-06-13 2003-06-05 Thyssenkrupp Stahl Ag Höherfestes, kaltumformbares Stahlblech, Verfahren zu seiner Herstellung und Verwendung eines solchen Blechs
ES2242899T3 (es) * 2001-09-28 2005-11-16 Daimlerchrysler Ag Acero de construccion ligera doble/triple de alta resistencia y su utilizacion.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007062702A1 *

Also Published As

Publication number Publication date
DE102005057599A1 (de) 2007-06-06
WO2007062702A1 (fr) 2007-06-07

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