US20150027597A1 - High strength bake-hardenable low density steel and method for producing said steel - Google Patents

High strength bake-hardenable low density steel and method for producing said steel Download PDF

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Publication number
US20150027597A1
US20150027597A1 US14/378,461 US201314378461A US2015027597A1 US 20150027597 A1 US20150027597 A1 US 20150027597A1 US 201314378461 A US201314378461 A US 201314378461A US 2015027597 A1 US2015027597 A1 US 2015027597A1
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United States
Prior art keywords
steel
strip
hot
ppm
solute
Prior art date
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Abandoned
Application number
US14/378,461
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English (en)
Inventor
Cheng Liu
Radhakanta Rana
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.)
Tata Steel Nederland Technology BV
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Tata Steel Nederland Technology BV
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Application filed by Tata Steel Nederland Technology BV filed Critical Tata Steel Nederland Technology BV
Assigned to TATA STEEL NEDERLAND TECHNOLOGY BV reassignment TATA STEEL NEDERLAND TECHNOLOGY BV ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RANA, Radhakanta, LIU, CHENG
Publication of US20150027597A1 publication Critical patent/US20150027597A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • C21D8/0284—Application of a separating or insulating coating
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • the invention relates to a high strength bake-hardenable low density steel and to a method for producing said steel.
  • ferritic steel strip or sheet comprising, in weight percent
  • the steel according to the invention has a tailored chemical composition to allow the steel to contain carbon in solid solution (C_solute) after the annealing and optional galvanising step.
  • This carbon in solid solution allows the steel to be bake-hardenable e.g. in a paint-baking cycle.
  • the car component is formed from the steel coming of the mill, and the component is painted and baked after it has been formed into its final shape.
  • the steel according to the invention combines the good formability prior to forming a car component, i.e. before the paint-baking operation, with a higher strength after the paint-baking operation.
  • solute carbon solute carbon
  • the level of solute carbon may also not exceed a critical upper value because the steel is preferably free from natural ageing.
  • Natural ageing is the spontaneous ageing of a supersaturated solid solution at room temperature and involves a spontaneous change in the physical properties of the steel, which occurs on being held at atmospheric temperatures after hot- or cold rolling or after a final heat treatment, e.g. during transport to or storage at a customers prior to processing the strip. This natural ageing involves changes of the mechanical properties which are considered undesirable as they lead to unpredictable variations in processability during the forming of the car components. Also, the surface quality may be adversely affected due to the formation of so-called Luder-lines. Also, too high a carbon level in solid solution may result in a deterioration of the formability prior to bake-hardening.
  • solute carbon For that reason a maximum value of 50 ppm of solute carbon is preferable. A more suitable maximum is 40 ppm of solute carbon (i.e. 0.004%).
  • C_solute is at least 0.0010 (10 ppm) and/or at most 0.0030 (30 ppm). This achieves a stable process and reproducible properties.
  • Nitrogen in particularly free nitrogen (i.e. nitrogen in solid solution), is not desirable but unavoidable in steel making. Titanium can be optionally added to bound nitrogen into TiN. The large amount of aluminium in the steel can also ensure that all nitrogen is bound. This means that the matrix is substantially free of nitrogen in solid solution.
  • Boron is optionally added to the steel. Its presence is not mandatory, but it may help to suppress any tendency for secondary work embrittlement. If added, a minimum amount of 5 ppm boron is required.
  • the manganese content is at least 0.1%. In another embodiment the aluminium content is at least 6% and/or at most 9%, preferably at most 8%.
  • the steel is preferably calcium treated.
  • the chemical composition may therefore also contain calcium in an amount consistent with a calcium treatment.
  • the amount of carbon in solid solution is controlled by the addition of microalloying elements (Ti, Nb, V, Zr) in combination with excellent control of the total carbon content in the steel.
  • Ti or Nb should be strictly controlled. Too much titanium or niobium will combine with carbon to form carbides or, in the presence of sulphur, carbosulphides. As a consequence of this, no solute carbon is available and no bake-hardenability.
  • the amount of carbon in solid solution according to this invention is calculated by subtracting from the total carbon content C_total the precipitates comprising carbon as follows:
  • Ti is beneficial for binding nitrogen, but not strictly necessary. Up to 0.019% Ti can be added into the steel, mainly to bind nitrogen into TiN and secondarily to control the amount of solute carbon. The titanium content must 0.019% or lower, e.g. at most 0.018% or 0.015% or even at most 0.012%.
  • titanium is added as an alloying element, a suitable minimum value for the titanium content is 0.005%. If added, then a suitable minimum value for Nb is 0.008%. If added, then for V and Zr suitable minimum values are 0.002 and 0.004 respectively.
  • the composition of the ferritic steel according to the invention has a base composition of (in weight percent),
  • Titanium as an alloying element or as an inevitable impurity, will first form TiN. If there is excess nitrogen, then the remaining nitrogen will be bound to aluminium. If there is excess titanium, then the remaining titanium will form Ti 4 C 2 S 2 until all titanium is consumed.
  • the factor Minimum[X,Y] calculates how much carbon is consumed by the formation of Ti 4 C 2 S 2 after all free nitrogen was bound to TiN. If the calculation results in a negative value for Y, then the factor is to be set to zero.
  • solute carbon available for bake hardening.
  • level of solute carbon below 50 ppm, and preferably below 40 ppm, the steel according to the invention is bake hardenable and nature-aging resistant.
  • a method for producing a ferritic steel strip comprising the steps of:
  • the coiling temperature is at least 600° C. and/or the hot rolling finishing temperature is at least 900° C.
  • This hot-rolled strip can be subsequently further processed in a process comprising the steps of:
  • the hot-rolled strip is usually pickled and cleaned prior to the cold-rolling step.
  • the peak metal temperature in the continuous annealing process is at least 750° C., preferably at least 800° C.
  • the cold rolling reduction is at least 50%.
  • the thickness of the hot-rolled strip is between 1 and 5 mm and/or the thickness of the cold-rolled strip is between 0.4 and 2 mm.
  • the hot-rolled strip is annealed in a continuous annealing step and optionally galvanised in a hot-dip galvanising step.
  • the annealing may also take place in a so called heat-to-coat cycle.
  • a heat-to-coat cycle the hot-rolled steel is reheated to a temperature sufficient for performing the hot-dip galvanising, but not to a temperature as high as the conventional continuous annealing step.
  • the carbon which may have precipitated during the slow cooling of the hot rolled coil after hot rolling is brought into solid solution again.
  • After annealing and/or galvanising the steel has to be fast cooled to avoid precipitation of the carbon in solid solution.
  • this galvanised steel sheet for producing a car component or other product by forming, followed by painting and baking, then the paint-baking also ensures the strength increase associated with the paint-baking cycle.
  • the steels were produced by casting a slab and reheating the slab at a temperature of at most 1250° C. This temperature is the maximum temperature, because at higher reheating temperatures excessive grain growth may occur.
  • the finishing temperature during hot rolling was 900° C., coiling temperature 650° C. followed by pickling and cold rolling (67%) and continuous annealing at a peak metal temperature of 800° C. and hot-dip-galvanising.
  • Steel 3a also contained 16 ppm B.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
US14/378,461 2012-02-20 2013-02-19 High strength bake-hardenable low density steel and method for producing said steel Abandoned US20150027597A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP12156180 2012-02-20
EP12156180.7 2012-02-20
EP12160499 2012-03-21
EP12160499.5 2012-03-21
PCT/EP2013/053257 WO2013124264A1 (fr) 2012-02-20 2013-02-19 Acier pouvant être durci par cuisson, à faible densité et à haute résistance et son procédé de production

Publications (1)

Publication Number Publication Date
US20150027597A1 true US20150027597A1 (en) 2015-01-29

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ID=47720526

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US14/378,461 Abandoned US20150027597A1 (en) 2012-02-20 2013-02-19 High strength bake-hardenable low density steel and method for producing said steel

Country Status (6)

Country Link
US (1) US20150027597A1 (fr)
EP (1) EP2817428B2 (fr)
JP (1) JP6342336B2 (fr)
KR (1) KR20140129150A (fr)
CN (1) CN104126023B (fr)
WO (1) WO2013124264A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9777350B2 (en) 2012-04-11 2017-10-03 Tata Steel Nederland Technology B.V. High strength interstitial free low density steel and method for producing said steel
US10626485B2 (en) 2015-02-17 2020-04-21 Jfe Steel Corporation Thin high-strength cold-rolled steel sheet and method of producing the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023148087A1 (fr) * 2022-02-03 2023-08-10 Tata Steel Ijmuiden B.V. Procédé de fabrication d'une bande d'acier à faible teneur en carbone ayant une aptitude au formage améliorée

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2536255B2 (ja) * 1990-08-04 1996-09-18 日本鋼管株式会社 制振合金
JPH04232229A (ja) * 1990-12-28 1992-08-20 Nkk Corp 給排水管等の配管用制振鋼管
JPH04252229A (ja) 1991-01-29 1992-09-08 Asahi Chem Ind Co Ltd シリコーン化合物及びその製法
KR0121737B1 (ko) 1992-08-31 1997-12-04 다나까 미노루 소부 경화성, 상온 비시효성 및 가공성이 우수한 냉연강판 및 용융아연 도금 냉연강판 및 그의 제조방법
US5595706A (en) 1994-12-29 1997-01-21 Philip Morris Incorporated Aluminum containing iron-base alloys useful as electrical resistance heating elements
DE19634524A1 (de) 1996-08-27 1998-04-09 Krupp Ag Hoesch Krupp Leichtbaustahl und seine Verwendung für Fahrzeugteile und Fassadenverkleidungen
JP2001271148A (ja) 2000-03-27 2001-10-02 Nisshin Steel Co Ltd 耐高温酸化性に優れた高Ａｌ鋼板
JP4471688B2 (ja) 2003-06-18 2010-06-02 新日本製鐵株式会社 延性に優れた高強度低比重鋼板およびその製造方法
CN1238548C (zh) * 2003-09-23 2006-01-25 东北大学 一种屈服强度460MPa级低合金高强度结构钢板材的制造方法
JP4084733B2 (ja) * 2003-10-14 2008-04-30 新日本製鐵株式会社 延性に優れた高強度低比重鋼板およびその製造方法
JP2005120599A (ja) 2003-10-14 2005-05-12 Shirokuma Co Ltd 手摺用自在継手
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
JP4299774B2 (ja) 2004-12-22 2009-07-22 新日本製鐵株式会社 延性および疲労特性に優れた高強度低比重鋼板とその製造方法
JP4797807B2 (ja) * 2006-05-30 2011-10-19 Ｊｆｅスチール株式会社 高剛性低密度鋼板およびその製造方法
EP1995336A1 (fr) * 2007-05-16 2008-11-26 ArcelorMittal France Acier à faible densité présentant une bonne aptitude à l'emboutissage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9777350B2 (en) 2012-04-11 2017-10-03 Tata Steel Nederland Technology B.V. High strength interstitial free low density steel and method for producing said steel
US10626485B2 (en) 2015-02-17 2020-04-21 Jfe Steel Corporation Thin high-strength cold-rolled steel sheet and method of producing the same

Also Published As

Publication number Publication date
EP2817428A1 (fr) 2014-12-31
JP6342336B2 (ja) 2018-06-13
JP2015513608A (ja) 2015-05-14
EP2817428B1 (fr) 2016-04-20
WO2013124264A1 (fr) 2013-08-29
KR20140129150A (ko) 2014-11-06
EP2817428B2 (fr) 2019-06-19
CN104126023A (zh) 2014-10-29
CN104126023B (zh) 2017-02-22

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