MX2013013218A - Metodo para la fabricacion de acero martensitico con limite de elasticidad muy alto y placa o pieza obtenida por tal metodo. - Google Patents

Metodo para la fabricacion de acero martensitico con limite de elasticidad muy alto y placa o pieza obtenida por tal metodo.

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Publication number
MX2013013218A
MX2013013218A MX2013013218A MX2013013218A MX2013013218A MX 2013013218 A MX2013013218 A MX 2013013218A MX 2013013218 A MX2013013218 A MX 2013013218A MX 2013013218 A MX2013013218 A MX 2013013218A MX 2013013218 A MX2013013218 A MX 2013013218A
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MX
Mexico
Prior art keywords
sheet
temperature
rate
production
semi
Prior art date
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MX2013013218A
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English (en)
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MX356324B (es
Inventor
Kangying Zhu
Olivier Bouaziz
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Arcelormittal Investigacion Y Desarrollo Sl
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Publication date
Application filed by Arcelormittal Investigacion Y Desarrollo Sl filed Critical Arcelormittal Investigacion Y Desarrollo Sl
Publication of MX2013013218A publication Critical patent/MX2013013218A/es
Publication of MX356324B publication Critical patent/MX356324B/es

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263Modifying 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
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32Ferrous alloys, e.g. steel alloys containing chromium with boron
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite

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)
  • Heat Treatment Of Sheet Steel (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)

Abstract

La invención se refiere a un método para la producción de una placa de acero martensítico que tiene un límite de elasticidad superior a 1300 MPa. El método comprende las siguientes etapas que consisten en: proporcionar un producto semiterminado de acero cuya composición comprende, los contenidos expresados en peso, 0.15 = C = 0.40%, 1.5% = Mn = 3%, 0.005% = Si = 2%, 0.005% = Al = 0.1%, S = 0.05%, P 0.1%, 0.025% = Nb = 0.1% y opcionalmente: 0.01% = Ti = 0.1%, 0% = Cr = 4%, 0% = Mo = 2%, 0.0005% = B = 0.005%, 0.0005% = Ca = 0.005%, el resto de la composición es constituida de hierro e impurezas inevitables que resultan de la elaboración, calentar el producto semiterminado a una temperatura T1 comprendida entre 1050°C y 1250°C, y posteriormente someter el producto semiterminado calentado a una laminación de desbaste a una temperatura T2 comprendida entre 1050 y 1150°C, con un índice de reducción acumulada más alta superior a 100% para obtener una placa con una estructura austenítica recristalizada parcialmente, con un tamaño promedio de grano inferior a 40 micrómetros y preferiblemente menos de 5 micrómetros y enfriar la placa para prevenir la transformación de la austenita, a una velocidad VR1 superior a 2°C/s hasta una temperatura T3 comprendida entre 970°C y Ar3+30°C y posteriormente someter la placa enfriada a una laminación de acabado en caliente a temperatura T3, con un índice de reducción acumulada eb superior a 50% para obtener una placa que se enfría a una velocidad VR2 superior a la velocidad crítica de enfriamiento.
MX2013013218A 2011-05-12 2012-04-20 Método para la fabricación de acero martensítico con límite de elasticidad muy alto y placa o pieza obtenida por tal método. MX356324B (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/FR2011/000295 WO2012153009A1 (fr) 2011-05-12 2011-05-12 Procede de fabrication d'acier martensitique a tres haute resistance et tole ainsi obtenue
PCT/FR2012/000156 WO2012153013A1 (fr) 2011-05-12 2012-04-20 Procede de fabrication d'acier martensitique a tres haute limite elastique tole ou piece ainsi obtenue.

Publications (2)

Publication Number Publication Date
MX2013013218A true MX2013013218A (es) 2013-12-12
MX356324B MX356324B (es) 2018-05-23

Family

ID=46197584

Family Applications (1)

Application Number Title Priority Date Filing Date
MX2013013218A MX356324B (es) 2011-05-12 2012-04-20 Método para la fabricación de acero martensítico con límite de elasticidad muy alto y placa o pieza obtenida por tal método.

Country Status (16)

Country Link
US (1) US9963756B2 (es)
EP (1) EP2707515B1 (es)
JP (1) JP6161597B2 (es)
KR (2) KR20160066007A (es)
CN (1) CN103517996B (es)
BR (1) BR112013029012B1 (es)
CA (1) CA2834967C (es)
ES (1) ES2551005T3 (es)
HU (1) HUE027986T2 (es)
MA (1) MA35059B1 (es)
MX (1) MX356324B (es)
PL (1) PL2707515T3 (es)
RU (1) RU2550682C1 (es)
UA (1) UA111200C2 (es)
WO (2) WO2012153009A1 (es)
ZA (1) ZA201307845B (es)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2818564B1 (en) * 2012-02-23 2017-01-18 JFE Steel Corporation Method for producing electrical steel sheet
CN103146997B (zh) 2013-03-28 2015-08-26 宝山钢铁股份有限公司 一种低合金高韧性耐磨钢板及其制造方法
KR101909356B1 (ko) * 2013-12-11 2018-10-17 아르셀러미탈 지연 파괴 저항을 갖는 마텐자이트 강 및 제조 방법
JP6652966B2 (ja) 2014-09-22 2020-02-26 アルセロールミタル 車両底部構造および車両ボディ
KR20190134842A (ko) 2015-02-25 2019-12-04 아르셀러미탈 항복 강도 및 구멍 확장성이 개선된 포스트 어닐링된 고인장 강도의 코팅된 강 시트
WO2019226197A1 (en) * 2018-05-25 2019-11-28 Kingston William R Impact resistant high strength steel
CN111448328B (zh) * 2018-03-29 2022-05-24 日本制铁株式会社 热冲压成形体
WO2019216269A1 (ja) 2018-05-07 2019-11-14 日本製鉄株式会社 熱延鋼板及びその製造方法
KR102109271B1 (ko) * 2018-10-01 2020-05-11 주식회사 포스코 표면 품질이 우수하고, 재질편차가 적은 초고강도 열연강판 및 그 제조방법
CN110129670B (zh) * 2019-04-25 2020-12-15 首钢集团有限公司 一种1300MPa级高强高塑性热冲压用钢及其制备方法
CN113528944B (zh) * 2021-06-17 2022-12-16 首钢集团有限公司 一种1000MPa易成形耐磨钢板及其制备方法
CN113755758B (zh) * 2021-09-03 2023-02-03 本钢板材股份有限公司 一种添加铈微合金制备的8mm厚热冲压钢以及其热冲压工艺

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4619714A (en) * 1984-08-06 1986-10-28 The Regents Of The University Of California Controlled rolling process for dual phase steels and application to rod, wire, sheet and other shapes
JPS63134628A (ja) 1986-11-25 1988-06-07 Sumitomo Metal Ind Ltd 高強度高靭性を有する熱延厚鋼板の製造法
JPH01275719A (ja) 1988-04-26 1989-11-06 Sumitomo Metal Ind Ltd 高強度高靭性を有する厚鋼板の製造法
CN1106070A (zh) 1994-01-31 1995-08-02 沈阳重型机器厂 耐低温可焊接细晶粒厚度方向钢板
AU736035B2 (en) * 1997-07-28 2001-07-26 Exxonmobil Upstream Research Company Ultra-high strength, weldable steels with excellent ultra-low temperature toughness
TW459052B (en) 1997-12-19 2001-10-11 Exxon Production Research Co Ultra-high strength steels with excellent cryogenic temperature toughness
EP1288322A1 (en) * 2001-08-29 2003-03-05 Sidmar N.V. An ultra high strength steel composition, the process of production of an ultra high strength steel product and the product obtained
JP2004010971A (ja) 2002-06-07 2004-01-15 Nippon Steel Corp 強度・靭性に優れ、かつ平坦度の良好な鋼板の高効率製造方法
US6811624B2 (en) * 2002-11-26 2004-11-02 United States Steel Corporation Method for production of dual phase sheet steel
FR2849864B1 (fr) * 2003-01-15 2005-02-18 Usinor Acier lamine a chaud a tres haute resistance et procede de fabrication de bandes
FR2885142B1 (fr) * 2005-04-27 2007-07-27 Aubert & Duval Soc Par Actions Acier martensitique durci, procede de fabrication d'une piece a partir de cet acier, et piece ainsi obtenue
JP2007154305A (ja) * 2005-07-05 2007-06-21 Jfe Steel Kk 強度、延性及び靱性に優れた機械構造用鋼およびその製造方法
EP1832667A1 (fr) * 2006-03-07 2007-09-12 ARCELOR France Procédé de fabrication de tôles d'acier à très hautes caractéristiques de résistance, de ductilité et de tenacité, et tôles ainsi produites
JP5277648B2 (ja) * 2007-01-31 2013-08-28 Jfeスチール株式会社 耐遅れ破壊特性に優れた高張力鋼板並びにその製造方法
JP5266804B2 (ja) 2008-03-07 2013-08-21 Jfeスチール株式会社 圧延非調質鋼材の製造方法
EP2267177B1 (en) * 2008-09-17 2013-01-23 Nippon Steel & Sumitomo Metal Corporation High-strength steel plate and producing method therefor
CN101676425B (zh) 2008-09-18 2011-07-20 宝山钢铁股份有限公司 高强度马氏体耐磨钢
JP2010106287A (ja) 2008-10-28 2010-05-13 Jfe Steel Corp 疲労特性に優れた高張力鋼材およびその製造方法
JP4542624B2 (ja) * 2008-11-11 2010-09-15 新日本製鐵株式会社 高強度厚鋼板およびその製造方法
JP5182642B2 (ja) * 2008-12-03 2013-04-17 新日鐵住金株式会社 耐遅れ破壊特性および溶接性に優れる高強度厚鋼板およびその製造方法
KR101091306B1 (ko) * 2008-12-26 2011-12-07 주식회사 포스코 원자로 격납 용기용 고강도 강판 및 그 제조방법
JP5439819B2 (ja) * 2009-01-09 2014-03-12 Jfeスチール株式会社 疲労特性に優れた高張力鋼材およびその製造方法
JP5412915B2 (ja) 2009-03-27 2014-02-12 Jfeスチール株式会社 フェライト・パーライト型圧延非調質鋼材の製造方法
CN101586217B (zh) 2009-06-25 2011-03-16 莱芜钢铁集团有限公司 一种低成本超高强韧马氏体钢及其制造方法
JP5609383B2 (ja) * 2009-08-06 2014-10-22 Jfeスチール株式会社 低温靭性に優れた高強度熱延鋼板およびその製造方法
PL2581465T3 (pl) * 2010-06-14 2019-09-30 Nippon Steel & Sumitomo Metal Corporation Wyrób formowany przez wytłaczanie na gorąco, sposób wytwarzania blachy stalowej cienkiej do wytłaczania na gorąco i sposób wytwarzania wyrobu formowanego przez wytłaczanie na gorąco

Also Published As

Publication number Publication date
US20140144559A1 (en) 2014-05-29
MX356324B (es) 2018-05-23
CA2834967C (fr) 2017-02-21
KR20140018382A (ko) 2014-02-12
RU2550682C1 (ru) 2015-05-10
MA35059B1 (fr) 2014-04-03
EP2707515A1 (fr) 2014-03-19
WO2012153013A1 (fr) 2012-11-15
PL2707515T3 (pl) 2016-01-29
BR112013029012B1 (pt) 2018-10-09
EP2707515B1 (fr) 2015-08-19
CN103517996B (zh) 2016-05-11
UA111200C2 (uk) 2016-04-11
JP2014517873A (ja) 2014-07-24
HUE027986T2 (en) 2016-11-28
CA2834967A1 (fr) 2012-11-15
KR20160066007A (ko) 2016-06-09
ES2551005T3 (es) 2015-11-13
ZA201307845B (en) 2015-06-24
JP6161597B2 (ja) 2017-07-12
CN103517996A (zh) 2014-01-15
KR101903823B1 (ko) 2018-10-02
WO2012153009A1 (fr) 2012-11-15
US9963756B2 (en) 2018-05-08
BR112013029012A2 (pt) 2017-01-17

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