EP2183396B1 - Steel for producing machine components formed from solid stock - Google Patents

Steel for producing machine components formed from solid stock Download PDF

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Publication number
EP2183396B1
EP2183396B1 EP08801149A EP08801149A EP2183396B1 EP 2183396 B1 EP2183396 B1 EP 2183396B1 EP 08801149 A EP08801149 A EP 08801149A EP 08801149 A EP08801149 A EP 08801149A EP 2183396 B1 EP2183396 B1 EP 2183396B1
Authority
EP
European Patent Office
Prior art keywords
accordance
component
steel
controlled cooling
cooling down
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
EP08801149A
Other languages
German (de)
French (fr)
Other versions
EP2183396A1 (en
Inventor
Roman Diederichs
Axel STÜBER
Robert Lange
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.)
Georgsmarienhuette GmbH
Original Assignee
Georgsmarienhuette 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 Georgsmarienhuette GmbH filed Critical Georgsmarienhuette GmbH
Publication of EP2183396A1 publication Critical patent/EP2183396A1/en
Application granted granted Critical
Publication of EP2183396B1 publication Critical patent/EP2183396B1/en
Revoked 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
    • C22C38/02—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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Definitions

  • the invention relates to a steel for producing massively formed machine components, in particular for vehicle construction, with a predominantly bainitic structure.
  • the chemical composition has the following contents by weight: 0.10% ⁇ C ⁇ 0.25% 0.15% ⁇ Si ⁇ 0.40% 1.00% ⁇ Mn ⁇ 1.50% 1.00% ⁇ Cr ⁇ 2.00% 0.20% ⁇ Ni ⁇ 0.40% 0.05% ⁇ Mo ⁇ 0.20% 0.010% ⁇ Nb ⁇ 0.040% 0.05% ⁇ V ⁇ 0.25% 0.01% ⁇ Al ⁇ 0.05% 0.005% ⁇ N ⁇ 0.025% 0% ⁇ B ⁇ 0.0050% the remainder being iron and the meltdown-related contaminants.
  • a particularly advantageous composition of the steel is given by claim 2, wherein: 0.10% ⁇ C ⁇ 0.20% 0.20% ⁇ Si ⁇ 0.30% 1.00% ⁇ Mn ⁇ 1.50% 1.50% ⁇ Cr ⁇ 2.00% 0.20% ⁇ Ni ⁇ 0.40% 0.05% ⁇ Mo ⁇ 0.20% 0.020% ⁇ Nb ⁇ 0.040% 0.05% ⁇ V ⁇ 0.20% 0.01% ⁇ Al ⁇ 0.05% 0.005% ⁇ N ⁇ 0.025% the remainder being iron and the contaminants due to melting.
  • the yield strength after accelerated controlled cooling from the forming heat is above 620 N / mm 2 .
  • the tensile strength should be according to claim 5 after an accelerated, controlled cooling from the forming heat between 800 N / mm 2 and 1100 N / mm 2 .
  • the yield ratio after accelerated, controlled cooling from the forming heat over 70%.
  • the elongation at break after an accelerated, controlled cooling from the forming heat is over 10%.
  • the Brucheinschnürung after an accelerated, controlled cooling from the forming heat is over 40%.
  • the notched-bar bending work (DVM notch, room temperature) after an accelerated, controlled cooling from the Umformmaschine over 25 J.
  • the toughness characteristics can be adjusted by a stepped cooling with first high cooling rate and a holding stage in the bainite range or a subsequent aging treatment.
  • the component should be suitable for case hardening and carbonitriding according to claim 11.
  • thermo-mechanical treatment the mechanical properties in both the rolled forging stock and in the forged component by a thermo-mechanical treatment can be adjusted.

Landscapes

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

Abstract

The invention relates to a steel and a processing method for producing machine components formed from solid stock, particularly for vehicle construction, having a primarily bainitic structure, characterized in that the chemical composition thereof has the following contents in weight percent: 0.10% ≤ C ≤ 0.25%, 0.15% ≤ Si ≤ 0.40%, 1.00% ≤ Mn ≤ 1.50%, 1.00% ≤ Cr ≤ 2.00%, 0.20% ≤ Ni ≤ 0.40%, 0.05% ≤ Mo ≤ 0.20%, 0.010% ≤ Nb ≤ 0.040%, 0.05% ≤ V ≤ 0.25%, 0.01 % ≤ Al ≤ 0.05%, 0.005% ≤ N ≤ 0.025%, 0% ≤ B ≤ 0.0050%, with the remainder being iron and the steel making-related accompanying elements and residual materials.

Description

Die Erfindung betrifft einen Stahl zur Herstellung von massiv umgeformten Maschinenbauteilen, insbesondere für den Fahrzeugbau, mit vorwiegend bainitischer Struktur.The invention relates to a steel for producing massively formed machine components, in particular for vehicle construction, with a predominantly bainitic structure.

Dabei ist erfindungsgemäß vorgesehen, dass die chemische Zusammensetzung folgende Gehalte an Gewichtsprozent aufweist: 0,10% ≤ C ≤ 0,25% 0,15% ≤ Si ≤ 0,40% 1,00% ≤ Mn ≤ 1,50% 1,00% ≤ Cr ≤ 2,00% 0,20% ≤ Ni ≤ 0,40% 0,05% ≤ Mo ≤ 0,20% 0,010% ≤ Nb ≤ 0,040% 0,05% ≤ V ≤ 0,25% 0,01% ≤ Al ≤ 0,05% 0,005% ≤ N ≤ 0,025% 0% ≤ B ≤ 0,0050% wobei der Rest aus Eisen und den erschmelzungsbedingten Verunnreinigungen besteht.It is provided according to the invention that the chemical composition has the following contents by weight: 0.10% ≤ C ≤ 0.25% 0.15% ≤ Si ≤ 0.40% 1.00% ≤ Mn ≤ 1.50% 1.00% ≤ Cr ≤ 2.00% 0.20% ≤ Ni ≤ 0.40% 0.05% ≤ Mo ≤ 0.20% 0.010% ≤ Nb ≤ 0.040% 0.05% ≤ V ≤ 0.25% 0.01% ≤ Al ≤ 0.05% 0.005% ≤ N ≤ 0.025% 0% ≤ B ≤ 0.0050% the remainder being iron and the meltdown-related contaminants.

Eine besonders vorteilhafte Zusammensetzung des Stahls ist durch den Anspruch 2 gegeben, wobei: 0,10% ≤ C ≤ 0,20% 0,20% ≤ Si ≤ 0,30% 1,00% ≤ Mn ≤ 1,50% 1,50% ≤ Cr ≤ 2,00% 0,20% ≤ Ni ≤ 0,40% 0,05% ≤ Mo ≤ 0,20% 0,020% ≤ Nb ≤ 0,040% 0,05% ≤ V ≤ 0,20% 0,01% ≤ Al ≤ 0,05% 0,005% ≤ N ≤ 0,025% wobei der Rest aus Eisen und den erschmelzungsbedingten Verunreinigungen besteht.A particularly advantageous composition of the steel is given by claim 2, wherein: 0.10% ≤ C ≤ 0.20% 0.20% ≤ Si ≤ 0.30% 1.00% ≤ Mn ≤ 1.50% 1.50% ≤ Cr ≤ 2.00% 0.20% ≤ Ni ≤ 0.40% 0.05% ≤ Mo ≤ 0.20% 0.020% ≤ Nb ≤ 0.040% 0.05% ≤ V ≤ 0.20% 0.01% ≤ Al ≤ 0.05% 0.005% ≤ N ≤ 0.025% the remainder being iron and the contaminants due to melting.

Es is zwar aus der EP-A-1 780 293 bereits ein Stahl mit ähnlichen Eigenschaften bekannt, bei dem jedoch zusätzlich die Elemente Schwefel, Phosphor und Titan als notwendig erachtet werden. Darüber hinaus unterscheidet sich die vorbekannte Stahllegierung von dem Stahl der Erfindung durch die Gehalte an Si, Mn, Cr, Mo, V und N, die ausserhalb der Bereiche der Legierungselemente gemäß der Erfindung liegen.It is indeed from the EP-A-1 780 293 Already a steel with similar properties known, but in addition, the elements sulfur, phosphorus and titanium are considered necessary. Moreover, the prior art steel alloy differs from the steel of the invention by the contents of Si, Mn, Cr, Mo, V and N, which are outside the ranges of the alloying elements according to the invention.

Eine erfindungsgemäße Verwendung dieses Stahls ist bei der Herstellung von Maschinenbauteilen, insbesondere für den Fahrzeugbau gegeben, wobei derartige Bauteile nach dem Schmieden im Gesenk und einer beschleunigten, kontrollierten Abkühlung eine weitgehend bainitische Struktur mit Ausscheidungen von Sondercarbiden bzw. Nitriden aufweisen.An inventive use of this steel is given in the production of machine components, in particular for vehicle construction, such components after forging in the die and an accelerated, controlled cooling have a largely bainitic structure with precipitates of special carbides or nitrides.

Bei den so erzeugten Bauteilen ist gemäß Anspruch 4 vorgesehen, dass die Streckgrenze nach einer beschleunigten, kontrollierten Abkühlung aus der Umformwärme über 620 N/mm2 beträgt.In the components thus produced, it is provided according to claim 4 that the yield strength after accelerated controlled cooling from the forming heat is above 620 N / mm 2 .

Dabei soll die Zugfestigkeit gemäß Anspruch 5 nach einer beschleunigten, kontrollierten Abkühlung aus der Umformwärme zwischen 800 N/mm2 und 1100 N/mm2 betragen.The tensile strength should be according to claim 5 after an accelerated, controlled cooling from the forming heat between 800 N / mm 2 and 1100 N / mm 2 .

Vorzugsweise beträgt das Streckgrenzenverhältnis nach einer beschleunigten, kontrollierten Abkühlung aus der Umformwärme über 70%.Preferably, the yield ratio after accelerated, controlled cooling from the forming heat over 70%.

Gemäß Anspruch 7 ist vorgesehen, dass die Bruchdehnung nach einer beschleunigten, kontrollierten Abkühlung aus der Umformwärme über 10% beträgt.According to claim 7 it is provided that the elongation at break after an accelerated, controlled cooling from the forming heat is over 10%.

Gemäß Anspruch 8 ist vorgesehen, dass die Brucheinschnürung nach einer beschleunigten, kontrollierten Abkühlung aus der Umformwärme über 40% beträgt.According to claim 8 it is provided that the Brucheinschnürung after an accelerated, controlled cooling from the forming heat is over 40%.

Nach Anspruch 9 soll die Kerbschlagbiegearbeit (DVM-Kerbe, Raumtemperatur) nach einer beschleunigten, kontrollierten Abkühlung aus der Umformwärme über 25 J beträgt.According to claim 9, the notched-bar bending work (DVM notch, room temperature) after an accelerated, controlled cooling from the Umformwärme over 25 J.

Gemäß Anspruch 10 ist vorgeschlagen, dass die Zähigkeitskennwerte durch eine gestufte Abkühlung mit zunächst hoher Abkühlgeschwindigkeit und einer Haltestufe im Bainitbereich oder eine nachfolgende Alterungsbehandlung eingestellt werden können.According to claim 10 it is proposed that the toughness characteristics can be adjusted by a stepped cooling with first high cooling rate and a holding stage in the bainite range or a subsequent aging treatment.

Das Bauteil soll gemäß Anspruch 11 zum Einsatzhärten und Carbonitrieren geeignet sein.The component should be suitable for case hardening and carbonitriding according to claim 11.

Schließlich sollen die mechanischen Eigenschaften sowohl im gewalzten Schmiedevormaterial als auch im geschmiedeten Bauteil durch eine thermomechanische Behandlung eingestellt werden können.Finally, the mechanical properties in both the rolled forging stock and in the forged component by a thermo-mechanical treatment can be adjusted.

Claims (12)

  1. Steel to produce severely deformed machine components, used in particular for the construction of vehicles with a predominantly bainitic structure, which is characterised in that its chemical composition comprises the following content in percentages by weight: 0.10% ≤ C ≤ 0.25% 0.15% ≤ Si ≤ 0.40% 1.00% ≤ Mn ≤ 1.50% 1.00% ≤ Cr ≤ 2.00% 0.20% ≤ Ni ≤ 0.40% 0.05% ≤ Mo ≤ 0.20% 0.010% ≤ Nb ≤ 0.040% 0.05% ≤ V ≤ 0.25% 0.01% ≤ Al ≤ 0.05% 0.005% ≤ N ≤ 0.025% 0% ≤ B ≤ 0.0050%
    whereby the remainder consists of iron and impurities from the smelting process.
  2. Steel in accordance with claim 1, characterised in that its chemical composition is such that the following applies: 0.10% ≤ C ≤ 0.20% 0.20% ≤ Si ≤ 0.30% 1.00% ≤ Mn ≤ 1.50% 1.50% ≤ Cr ≤ 2.00% 0.20% ≤ Ni ≤ 0.40% 0.05% ≤ Mo ≤ 0.20% 0.020% ≤ Nb ≤ 0.040% 0.05% ≤ V ≤ 0.20% 0.01% ≤ Al ≤ 0.05% 0.005% ≤ N ≤ 0.025%
    whereby the remainder consists of iron and impurities from the smelting process.
  3. Use of a steel in accordance with claim 2 to produce machine components, used in particular for the manufacture of vehicles, whereby, after forging in the die followed by rapid controlled cooling, said steel has a predominantly bainitic structure with precipitates of special carbides or nitrides.
  4. Component in accordance with claim 3, characterised in that the elastic limit exceeds 620 N/mm2 after rapid controlled cooling down from the deformation heat.
  5. Component in accordance with claim 4, characterised in that the tensile strength lies between 800 N/mm2 and 1100 N/mm2 after rapid controlled cooling down from the deformation heat.
  6. Component in accordance with claim 5, characterised in that the yield strength ratio exceeds 70% after rapid controlled cooling down from the deformation heat.
  7. Component in accordance with claim 6, characterised in that the elongation to fracture exceeds 10% after rapid controlled cooling down from the deformation heat.
  8. Component in accordance with claim 7, characterised in that the reduction of area after fracture exceeds 40% after rapid controlled cooling down from the deformation heat.
  9. Component in accordance with claim 8, characterised in that the notched bar impact work (DVM notches, room temperature) exceeds 25 J after rapid controlled cooling down from the deformation heat.
  10. Component in accordance with claim 9, characterised in that the brittleness characteristic values can be adjusted by staged cooling with an initially high cooling rate and a holding stage in the bainitic region, or a subsequent ageing treatment.
  11. Component in accordance with claim 10, characterised in that it is suitable for case hardening and carbonitriding.
  12. Component in accordance with claim 11, characterised in that the mechanical properties can be adjusted both in the rolled base material as well as in the forged component by means of a thermo-mechanical treatment.
EP08801149A 2007-08-27 2008-08-12 Steel for producing machine components formed from solid stock Revoked EP2183396B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007040616 2007-08-27
PCT/DE2008/001319 WO2009026881A1 (en) 2007-08-27 2008-08-12 Steel for producing machine components formed from solid stock

Publications (2)

Publication Number Publication Date
EP2183396A1 EP2183396A1 (en) 2010-05-12
EP2183396B1 true EP2183396B1 (en) 2011-12-14

Family

ID=40149548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08801149A Revoked EP2183396B1 (en) 2007-08-27 2008-08-12 Steel for producing machine components formed from solid stock

Country Status (16)

Country Link
US (1) US20100189591A1 (en)
EP (1) EP2183396B1 (en)
JP (1) JP2010537054A (en)
KR (1) KR20100057823A (en)
CN (1) CN101821413A (en)
AR (1) AR067684A1 (en)
AT (1) ATE537274T1 (en)
AU (1) AU2008291431A1 (en)
CA (1) CA2697794A1 (en)
DE (1) DE102007057421A1 (en)
EA (1) EA017741B1 (en)
ES (1) ES2378353T3 (en)
MX (1) MX2010002282A (en)
TW (1) TW200927954A (en)
WO (1) WO2009026881A1 (en)
ZA (1) ZA201001002B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5620336B2 (en) * 2011-05-26 2014-11-05 新日鐵住金株式会社 Steel parts for high fatigue strength and high toughness machine structure and manufacturing method thereof
CN106661691B (en) * 2014-07-29 2018-07-24 新日铁住金株式会社 Carbo-nitriding bearing steel
JP2016145380A (en) * 2015-02-06 2016-08-12 株式会社神戸製鋼所 Steel for large sized forging and large sized forging component
CN113025777A (en) * 2021-03-02 2021-06-25 攀钢集团江油长城特殊钢有限公司 30CrNi2MoVA large-size forged material and preparation method thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3328211A (en) * 1963-12-05 1967-06-27 Ishikawajima Harima Heavy Ind Method of manufacturing weldable, tough and high strength steel for structure members usable in the ashot-state and steel so made
JPS61279656A (en) * 1985-06-05 1986-12-10 Daido Steel Co Ltd Non-heattreated steel for hot forging
JPH05148535A (en) * 1991-06-07 1993-06-15 Kobe Steel Ltd Production of surface hardened parts having decreased heat treating strain and excellent bending fatigue strength
JPH09170047A (en) * 1995-12-16 1997-06-30 Daido Steel Co Ltd Bainitic non-heat treated steel with high strength and high toughness and its production
CZ293084B6 (en) * 1999-05-17 2004-02-18 Jinpo Plus A. S. Steel for creep-resisting and high-strength wrought parts, particularly pipes, plates and forgings
JP2000345281A (en) * 1999-06-02 2000-12-12 Nippon Steel Corp Low alloy heat resistant steel excellent in weldability and low temperature toughness, and its production
US7081174B2 (en) * 2002-04-30 2006-07-25 Sanyo Special Steel Co., Ltd. Process for producing steel products having improved grain size properties and machinability
DE102005052069B4 (en) * 2005-10-28 2015-07-09 Saarstahl Ag Process for the production of semi-finished steel by hot working

Also Published As

Publication number Publication date
CN101821413A (en) 2010-09-01
ZA201001002B (en) 2010-10-27
CA2697794A1 (en) 2009-03-05
US20100189591A1 (en) 2010-07-29
EA201070313A1 (en) 2010-08-30
AU2008291431A1 (en) 2009-03-05
EP2183396A1 (en) 2010-05-12
EA017741B1 (en) 2013-02-28
ATE537274T1 (en) 2011-12-15
AR067684A1 (en) 2009-10-21
MX2010002282A (en) 2010-03-29
ES2378353T3 (en) 2012-04-11
TW200927954A (en) 2009-07-01
DE102007057421A1 (en) 2009-03-05
WO2009026881A1 (en) 2009-03-05
JP2010537054A (en) 2010-12-02
KR20100057823A (en) 2010-06-01

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