EP1520912A3 - Steel excellent in toughness of weld heat-affected zone - Google Patents

Steel excellent in toughness of weld heat-affected zone Download PDF

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Publication number
EP1520912A3
EP1520912A3 EP04026201A EP04026201A EP1520912A3 EP 1520912 A3 EP1520912 A3 EP 1520912A3 EP 04026201 A EP04026201 A EP 04026201A EP 04026201 A EP04026201 A EP 04026201A EP 1520912 A3 EP1520912 A3 EP 1520912A3
Authority
EP
European Patent Office
Prior art keywords
toughness
oxide particles
less
affected zone
weld heat
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.)
Granted
Application number
EP04026201A
Other languages
German (de)
French (fr)
Other versions
EP1520912B1 (en
EP1520912A2 (en
Inventor
Masanori Nippon Steel Corp. Minagawa
Toshihiko Nippon Steel Corp. Koseki
Yuji Nippon Steel Corp. Funatsu
Jun Nippon Steel Corp. Ohtani
Tomohiko Nippon Steel Corp. Hada
Tadashi Nippon Steel Corp. Ishikawa
Masaaki Nippon Steel Corp. Nagahara
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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
Priority claimed from JP2000033242A external-priority patent/JP2001226739A/en
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP1520912A2 publication Critical patent/EP1520912A2/en
Publication of EP1520912A3 publication Critical patent/EP1520912A3/en
Application granted granted Critical
Publication of EP1520912B1 publication Critical patent/EP1520912B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • C22C38/02—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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The present invention realizes excellent HAZ toughness by further suppressing the coarsening of austenite grains when they are heated for a long time at a high temperature in order to remarkably improve HAZ properties.
The present invention is a steel excellent in the toughness of a weld heat-affected zone: having a specific chemical composition in mass, of
  • C: 0.03 to 0.18%,
  • Si: 0.5% or less,
  • Mn: 0.4 to 2.0%,
  • P: 0.02% or less,
  • S: 0.02% or less,
  • Al: 0.005 to 0.04%,
  • Ti: 0.005 to 0.03%,
  • Ca: 0.0005 to 0.003%, and
  • N: 0.0005 to 0.007%,
    • with the balance consisting of Fe and unavoidable impurities; satisfying the expression 0 ≦ EN ≦ 0.002 regarding the EN value expressed by an equivalent equation comprising (%N), (%Ti) and (%B); and containing oxide particles 0.005 to 2.0 µm, preferably 0.1 to 2.0 µm, in circle-equivalent diameter, which oxide particles contain at least Ca, Al and O in their composition and, in the mass percentage of the elements excluding O, contain Ca at 5% or more and Al at 5% or more with the balance consisting of other deoxidizing elements and/or unavoidable impurities, with the density of the oxide particles being 100 to 3,000 pieces/mm2.
    Figure 00000001
    EP04026201A 2000-02-10 2000-11-13 Steel excellent in toughness of weld heat-affected zone Expired - Lifetime EP1520912B1 (en)

    Applications Claiming Priority (7)

    Application Number Priority Date Filing Date Title
    JP2000033241 2000-02-10
    JP2000033242 2000-02-10
    JP2000033241 2000-02-10
    JP2000033242A JP2001226739A (en) 2000-02-10 2000-02-10 Steel excellent in heat-affected zone toughness
    JP2000068210 2000-03-13
    JP2000068210 2000-03-13
    EP00974966A EP1262571B1 (en) 2000-02-10 2000-11-13 Steel having weld heat-affected zone excellent in toughness

    Related Parent Applications (1)

    Application Number Title Priority Date Filing Date
    EP00974966A Division EP1262571B1 (en) 2000-02-10 2000-11-13 Steel having weld heat-affected zone excellent in toughness

    Publications (3)

    Publication Number Publication Date
    EP1520912A2 EP1520912A2 (en) 2005-04-06
    EP1520912A3 true EP1520912A3 (en) 2005-04-27
    EP1520912B1 EP1520912B1 (en) 2007-01-17

    Family

    ID=27342318

    Family Applications (2)

    Application Number Title Priority Date Filing Date
    EP04026201A Expired - Lifetime EP1520912B1 (en) 2000-02-10 2000-11-13 Steel excellent in toughness of weld heat-affected zone
    EP00974966A Expired - Lifetime EP1262571B1 (en) 2000-02-10 2000-11-13 Steel having weld heat-affected zone excellent in toughness

    Family Applications After (1)

    Application Number Title Priority Date Filing Date
    EP00974966A Expired - Lifetime EP1262571B1 (en) 2000-02-10 2000-11-13 Steel having weld heat-affected zone excellent in toughness

    Country Status (4)

    Country Link
    EP (2) EP1520912B1 (en)
    KR (1) KR100514667B1 (en)
    DE (2) DE60021919T2 (en)
    WO (1) WO2001059167A1 (en)

    Families Citing this family (9)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JP3699077B2 (en) * 2002-10-29 2005-09-28 株式会社日本製鋼所 Base material for clad steel plate excellent in low temperature toughness of weld heat affected zone and method for producing the clad steel plate
    JP4972451B2 (en) * 2007-04-20 2012-07-11 株式会社神戸製鋼所 Low yield ratio high strength steel sheet with excellent low temperature toughness of weld heat affected zone and base metal and method for producing the same
    JP4399018B1 (en) 2008-07-15 2010-01-13 新日本製鐵株式会社 Steel sheet with excellent toughness of weld heat affected zone
    US9403242B2 (en) 2011-03-24 2016-08-02 Nippon Steel & Sumitomo Metal Corporation Steel for welding
    WO2013007729A1 (en) * 2011-07-10 2013-01-17 Tata Steel Ijmuiden Bv Hot-rolled high-strength steel strip with improved haz-softening resistance and method of producing said steel
    EP2784168B1 (en) * 2011-11-25 2016-11-23 Nippon Steel & Sumitomo Metal Corporation Steel material for welding
    KR101719943B1 (en) * 2013-03-12 2017-03-24 제이에프이 스틸 가부시키가이샤 Thick steel sheet having excellent ctod properties in multilayer welded joints, and manufacturing method for thick steel sheet
    CN103320692B (en) 2013-06-19 2016-07-06 宝山钢铁股份有限公司 Superhigh tenacity, superior weldability HT550 steel plate and manufacture method thereof
    CN103320693B (en) 2013-06-19 2015-11-18 宝山钢铁股份有限公司 Anti-zinc fracturing line steel plate and manufacture method thereof

    Citations (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JPH08158006A (en) * 1994-12-06 1996-06-18 Kobe Steel Ltd High strength steel excellent in toughness in weld heat-affected zone
    JPH10183295A (en) * 1996-12-19 1998-07-14 Nippon Steel Corp Steel material excellent in toughness at heat-affected zone in large heat input weld, and its production
    JPH11229078A (en) * 1998-02-16 1999-08-24 Kobe Steel Ltd High tensile strength steel plate excellent in toughness of parent metal and large heat-input weld heat affected zone and its production
    JP2000001738A (en) * 1998-04-15 2000-01-07 Nippon Steel Corp Steel plate excellent in toughness of heat-affected zone by welding

    Patent Citations (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JPH08158006A (en) * 1994-12-06 1996-06-18 Kobe Steel Ltd High strength steel excellent in toughness in weld heat-affected zone
    JPH10183295A (en) * 1996-12-19 1998-07-14 Nippon Steel Corp Steel material excellent in toughness at heat-affected zone in large heat input weld, and its production
    JPH11229078A (en) * 1998-02-16 1999-08-24 Kobe Steel Ltd High tensile strength steel plate excellent in toughness of parent metal and large heat-input weld heat affected zone and its production
    JP2000001738A (en) * 1998-04-15 2000-01-07 Nippon Steel Corp Steel plate excellent in toughness of heat-affected zone by welding

    Non-Patent Citations (4)

    * Cited by examiner, † Cited by third party
    Title
    PATENT ABSTRACTS OF JAPAN vol. 1996, no. 10 31 October 1996 (1996-10-31) *
    PATENT ABSTRACTS OF JAPAN vol. 1998, no. 12 31 October 1998 (1998-10-31) *
    PATENT ABSTRACTS OF JAPAN vol. 1999, no. 13 30 November 1999 (1999-11-30) *
    PATENT ABSTRACTS OF JAPAN vol. 2000, no. 04 31 August 2000 (2000-08-31) *

    Also Published As

    Publication number Publication date
    DE60021919T2 (en) 2006-06-08
    KR20020073579A (en) 2002-09-27
    DE60033070T2 (en) 2007-05-31
    WO2001059167A1 (en) 2001-08-16
    EP1262571A1 (en) 2002-12-04
    EP1520912B1 (en) 2007-01-17
    KR100514667B1 (en) 2005-09-14
    EP1520912A2 (en) 2005-04-06
    EP1262571A4 (en) 2003-03-26
    EP1262571B1 (en) 2005-08-10
    DE60033070D1 (en) 2007-03-08
    DE60021919D1 (en) 2005-09-15

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