EP1138796B1 - Acier laminé à chaud à très haute limite d'élasticité et résistance mécanique utilisable notamment pour la réalisation de pièce de véhicules automobiles - Google Patents

Acier laminé à chaud à très haute limite d'élasticité et résistance mécanique utilisable notamment pour la réalisation de pièce de véhicules automobiles Download PDF

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Publication number
EP1138796B1
EP1138796B1 EP01400777A EP01400777A EP1138796B1 EP 1138796 B1 EP1138796 B1 EP 1138796B1 EP 01400777 A EP01400777 A EP 01400777A EP 01400777 A EP01400777 A EP 01400777A EP 1138796 B1 EP1138796 B1 EP 1138796B1
Authority
EP
European Patent Office
Prior art keywords
vanadium
steel
strength
hot
yield strength
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
EP01400777A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1138796A1 (fr
Inventor
Xavier Bano
Jacques Devroc
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.)
ArcelorMittal France SA
Original Assignee
Arcelor France SA
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 Arcelor France SA filed Critical Arcelor France SA
Publication of EP1138796A1 publication Critical patent/EP1138796A1/fr
Application granted granted Critical
Publication of EP1138796B1 publication Critical patent/EP1138796B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • 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
    • C21D2211/002—Bainite

Definitions

  • the invention relates to a hot-rolled steel with a very high yield strength and a mechanical strength that can be used in particular for producing automotive parts.
  • the service life of the parts obtained by shaping from these sheets is an important criterion since it defines the service life of shaped parts, as for example by stamping, profiling or hydroforming.
  • the service life associated with the fatigue behavior defines the service life for specific loads.
  • one solution consists of the use of very high strength steels which have significant fatigue properties because, as a first approximation, there is a proportional relationship between the limit of endurance and mechanical resistance. Nevertheless, the steel must be suitable for stamping. However, in general, the shaping properties decrease with the increase of the mechanical strength thus limiting the possibilities of shaping workable parts with high strength steels.
  • Shock resistance is also an important property for safety reasons, particularly in automotive applications, since the impact strength defines the abrupt breaking strength of the parts.
  • the impact strength defines the abrupt breaking strength of the parts.
  • one solution consists of the use of steels with a very high yield strength because there is, as a first approximation, a linear relationship between the impact resistance and the yield strength. .
  • the shaping properties decrease with increasing yield strength.
  • HLE steels high yield strength steels, are micro alloyed steels with a yield strength of 315 MPa to 700 MPa, but which have a limited formability due, in particular, to a ratio of Re / Rm higher than 0.85. These steels have a ferrite-carbide phase structure of the cementite type.
  • the level of yield strength is obtained by controlled rolling and a precipitation of the micro-alloy elements such as niobium, vanadium, titanium during the ferritic transformation.
  • Dual-Phase steels are steels of ferrite-martensite structure with remarkable shaping properties.
  • the mechanical strength levels are generally between 550 MPa and 800 MPa.
  • the highest level is achieved by precipitation of micro-alloy elements during ferritic transformation that complements the hardening effect of martensite.
  • HR steels are so-called high-strength steels, carbon and manganese, undergoing after rolling, a relatively fast cooling associated with a low temperature winding to give them a ferritic-bainitic structure. They have an intermediate formability characteristic between HLE steels and Dual-Phase steels. The resistance level varies between 450 MPa and 800 MPa.
  • Martensitic steels with the highest resistance levels. These steels have a martensitic structure obtained by heat treatment after rolling. The realization of this type of structure on a broadband train is difficult because of the fragility of martensite which leads to breaks in the strip after rolling. Martensitic steels allow to reach resistance levels higher than 1000 MPa but with a very low level of ductility and elongations of less than 8%. It is also necessary to carry out a heat treatment after rolling.
  • DE 197 10 125 discloses a hot rolled steel having a bainitic structure and its method of manufacture.
  • the object of the invention is to present a hot rolled steel with a very high yield strength and mechanical strength having good forming properties for the production of parts by stamping, profiling, hydroforming especially for the automotive industry.
  • the cooling cycle from a temperature between 400 ° C and 600 ° C, and preferably to a temperature between 450 ° C and 500 ° C is performed in coil.
  • Table 1 shows the results obtained for an application example B according to the invention, framed by two comparison examples A and C, the analyzes of the two comparison examples comprising, one, a low vanadium content, the other a high vanadium content.
  • Table 1 Steel VS mn Cr MB Yes NOT V P AT 0.11 1.58 0.51 0.33 0.2 0.0035 0 0.02 B 0.11 1.58 0.51 0.32 0.2 0.0040 0.2 0.02 VS 0.11 1.58 0.51 0.34 0.2 0.0050 0.45 0.02
  • Table 2 gives the conditions of the heat treatment after hot rolling. Steel Tem rolling ° C Cooling speed. ° C / s Winding time.
  • Table 3 presents the mechanical characteristics in mechanical strength Rm, yield strength Re, and elongation A, of the three exemplary embodiments.
  • vanadium increases mechanical strength and reduces elongation. Vanadium is the necessary element in bainitic steel for the realization of a hardening effect, which is unexpected because the micro-alloy elements have a precipitation-hardening effect but this precipitation is completely finished to higher. temperature and must be in the ferritic field to be hardening.
  • the final structure of the steel according to the invention is a bainitic structure. This structure makes it possible to obtain a yield strength greater than 700 MPa, a resistance mechanical greater than 1000 MPa and an elongation greater than 10%. These values show the good shaping properties of the steel according to the invention.
  • the invention allows the rolling of a steel having a thickness of between 1.4 and 5 mm which has both a high mechanical strength, that is to say greater than 1000 MPa and shaping properties remarkable, thanks to an elongation greater than 10%.
  • the surface state, without defects, after stripping of the hot-rolled sheet is ensured in the composition of the steel by a silicon content of less than 0.5%.
  • the strip of hot-rolled steel sheet of the invention has an advantage in its use in sectors of activity such as for example the automobile and mechanical engineering in general, for stamped, folded, profiled or hydroformed parts, parts that can be lightened while ensuring fatigue performance, improved impact performance and a combination of these benefits.

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  • 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 Sheet Steel (AREA)
  • Laminated Bodies (AREA)
  • Heat Treatment Of Steel (AREA)
  • Body Structure For Vehicles (AREA)
EP01400777A 2000-03-29 2001-03-27 Acier laminé à chaud à très haute limite d'élasticité et résistance mécanique utilisable notamment pour la réalisation de pièce de véhicules automobiles Expired - Lifetime EP1138796B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0003958A FR2807068B1 (fr) 2000-03-29 2000-03-29 Acier lamine a chaud a tres haute limite d'elasticite et resistance mecanique utilisable notamment pour la realisation de piece de vehicules automobiles
FR0003958 2000-03-29

Publications (2)

Publication Number Publication Date
EP1138796A1 EP1138796A1 (fr) 2001-10-04
EP1138796B1 true EP1138796B1 (fr) 2006-06-28

Family

ID=8848604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01400777A Expired - Lifetime EP1138796B1 (fr) 2000-03-29 2001-03-27 Acier laminé à chaud à très haute limite d'élasticité et résistance mécanique utilisable notamment pour la réalisation de pièce de véhicules automobiles

Country Status (10)

Country Link
US (1) US6554919B2 (ja)
EP (1) EP1138796B1 (ja)
JP (1) JP4846916B2 (ja)
AR (1) AR027746A1 (ja)
AT (1) ATE331821T1 (ja)
BR (1) BR0101222B1 (ja)
CA (1) CA2342256C (ja)
DE (1) DE60121084T2 (ja)
ES (1) ES2267692T3 (ja)
FR (1) FR2807068B1 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030172512A1 (en) * 2002-03-12 2003-09-18 Suarez Carlos Infanzon Process for manufacturing fuel tanks by blast shaping of steel
FI114484B (fi) † 2002-06-19 2004-10-29 Rautaruukki Oyj Kuumavalssattu nauhateräs ja sen valmistusmenetelmä
CN101471216B (zh) * 2003-02-18 2010-10-13 松下电器产业株式会社 等离子体显示屏的制造方法以及基板保持件
EP2020451A1 (fr) * 2007-07-19 2009-02-04 ArcelorMittal France Procédé de fabrication de tôles d'acier à hautes caractéristiques de résistance et de ductilité, et tôles ainsi produites
FI20095528A (fi) * 2009-05-11 2010-11-12 Rautaruukki Oyj Menetelmä kuumavalssatun nauhaterästuotteen valmistamiseksi sekä kuumavalssattu nauhaterästuote
FI122313B (fi) * 2010-06-07 2011-11-30 Rautaruukki Oyj Menetelmä kuumavalssatun terästuotteen valmistamiseksi sekä kuumavalssattu teräs
CN110643894B (zh) * 2018-06-27 2021-05-14 宝山钢铁股份有限公司 具有良好的疲劳及扩孔性能的超高强热轧钢板和钢带及其制造方法
US20220056543A1 (en) 2018-09-20 2022-02-24 Arcelormittal Hot rolled steel sheet with high hole expansion ratio and manufacturing process thereof
WO2020065381A1 (en) 2018-09-28 2020-04-02 Arcelormittal Hot rolled steel sheet and a method of manufacturing thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5900075A (en) * 1994-12-06 1999-05-04 Exxon Research And Engineering Co. Ultra high strength, secondary hardening steels with superior toughness and weldability
US5743972A (en) * 1995-08-29 1998-04-28 Kawasaki Steel Corporation Heavy-wall structural steel and method
DE19719546C2 (de) * 1996-07-12 1998-12-03 Thyssen Stahl Ag Warmband aus Stahl und Verfahren zu seiner Herstellung
JP3635803B2 (ja) * 1996-09-10 2005-04-06 Ｊｆｅスチール株式会社 靱性に優れた高張力鋼材の製造方法
FR2756298B1 (fr) * 1996-11-26 1998-12-24 Ascometal Sa Acier et procede pour la fabrication d'une piece de mecanique ayant une structure bainitique
FR2757877B1 (fr) * 1996-12-31 1999-02-05 Ascometal Sa Acier et procede pour la fabrication d'une piece en acier mise en forme par deformation plastique a froid
DE19710125A1 (de) * 1997-03-13 1998-09-17 Krupp Ag Hoesch Krupp Verfahren zur Herstellung eines Bandstahles mit hoher Festigkeit und guter Umformbarkeit
KR100386767B1 (ko) * 1997-07-28 2003-06-09 닛폰 스틸 가부시키가이샤 인성이 우수한 초고강도 용접성 강의 제조방법

Also Published As

Publication number Publication date
CA2342256A1 (fr) 2001-09-29
ES2267692T3 (es) 2007-03-16
FR2807068B1 (fr) 2002-10-11
FR2807068A1 (fr) 2001-10-05
AR027746A1 (es) 2003-04-09
BR0101222B1 (pt) 2009-01-13
DE60121084D1 (de) 2006-08-10
DE60121084T2 (de) 2007-06-14
BR0101222A (pt) 2001-10-30
EP1138796A1 (fr) 2001-10-04
US20010049956A1 (en) 2001-12-13
ATE331821T1 (de) 2006-07-15
CA2342256C (fr) 2009-10-06
JP2001316767A (ja) 2001-11-16
JP4846916B2 (ja) 2011-12-28
US6554919B2 (en) 2003-04-29

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