WO2009082156A1 - Acier pour une structure de soudage comprenant un joint soudé ayant d'excellentes propriétés doef dans une zone affectée par la chaleur de soudage - Google Patents

Acier pour une structure de soudage comprenant un joint soudé ayant d'excellentes propriétés doef dans une zone affectée par la chaleur de soudage Download PDF

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Publication number
WO2009082156A1
WO2009082156A1 PCT/KR2008/007604 KR2008007604W WO2009082156A1 WO 2009082156 A1 WO2009082156 A1 WO 2009082156A1 KR 2008007604 W KR2008007604 W KR 2008007604W WO 2009082156 A1 WO2009082156 A1 WO 2009082156A1
Authority
WO
WIPO (PCT)
Prior art keywords
welded joint
structural steel
less
oxides
welded
Prior art date
Application number
PCT/KR2008/007604
Other languages
English (en)
Inventor
Young-Hwan Park
Hong-Chul Jeong
Original Assignee
Posco
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 Posco filed Critical Posco
Priority to CN200880122473.1A priority Critical patent/CN101910437B/zh
Priority to JP2010540569A priority patent/JP5303571B2/ja
Publication of WO2009082156A1 publication Critical patent/WO2009082156A1/fr

Links

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
    • C22C38/001—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
    • C22C38/002—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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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

Definitions

  • Titanium (Ti) content is in the range of 0.01 to 0.1%.
  • Mo is an element that enhances hardenability and strength. Mo may be added at
  • W content is in the range of 0.05 to 0.5%.
  • W may be added at 0.05% or more. However, W content exceeding 0.5% adversely affects the toughness of the welded metal zone. Therefore, W content is limited to the range of 0.05 to 0.5%.
  • Zr content is limited to the range of 0.005 to 0.5%.
  • Zr may be added at 0.005% or more because it is effective for enhancing strength.
  • Ca and/or REM act as elements that can stabilize a welding arc during welding and form oxides at the welded metal zone. Also, Ca and/or REM suppress growth of austenite grains during the cooling process and accelerate intragranular ferrite transformation, thus enhancing the toughness of the welded metal zone. To this end, Ca may be added at 0.0005% or more, and REM may be added at 0.005% or more. However, Ca content exceeding 0.05% and REM content exceeding 0.05% cause the formation of large oxides, which may degrade toughness. Cerium (Ce), lanthanum (La), yttrium (Y) and/or hafnium (Hf) may be used for REM.
  • Cerium (Ce), lanthanum (La), yttrium (Y) and/or hafnium (Hf) may be used for REM.
  • the fine structures of the welded metal zone formed after the SAW process include acicular ferrite having a fraction of 85% or more.
  • the acicular ferrite structure can obtain both high strength and low-temperature CTOD properties, unlike a combined structure of ferrite and bainite which is advantageous to the CTOD properties but ensures less strength of the welded metal zone, and a combined structure of an M-A structure and bainite which provides high strength at a welded metal zone but ensures less mechanical properties such as CTOD properties of the welded metal zone and high low-temperature cracking susceptibility.
  • the balance structure of the welded metal zone may include polygonal ferrite and a small amount of grain boundary ferrite.
  • the kinds, sizes and numbers of oxides existing in the welded metal zone considerably affect the transformation of the fine structure of the welded metal zone.
  • a SAW welded metal zone undergoes solidification by which grains may be rendered coarse and coarse grain-boundary ferrite, Widmanstatten ferrite and the like may be formed from grain boundaries, which may significantly degrade the properties of the welded metal zone.
  • TiO oxides are uniformly distributed in the weld metal at a spacing of 0.5 ⁇ m or less, and the grain size and threshold number of TiO oxides are limited to 0.01 to 0.1 ⁇ m and 1.0x10 /mm or more, respectively.
  • the welding structural steel according to the present invention may be adequately applied to various welding methods other than SAW. Particularly, a high heat input welding process with a high cooling rate is preferable because a high cooling rate of the welded metal zone is contributive to finely distributing the oxides and rendering the structures fine. For the same reason, cooling and Cu-backing of a steel material may be used to improve the cooling rate of the welded joint.
  • the application of known techniques to the present invention is merely a simple modification of the present invention and may be construed as included within the scope of the present invention.

Landscapes

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

Abstract

La présente invention concerne un acier de construction pour le soudage qui comprend, en poids, de 0,01 à 0,2% de C, de 0,1 à 0,5% de Si, de 1,0 à 3,0% de Mn, de 0,01 à 0,1% de Ti, de 0,5 à 3,0% de Ni, de 0,0010 à 0,01% de B, de 0,003 à 0,006% de N, de 0,030% ou moins de P, de 0,005 à 0,05% de Al, de 0,030% ou moins de S, de 0,05% ou moins de O, les impuretés inévitables et pour le reste, du fer. Les éléments Ti, O, N et B satisfont les relations: 0,2≤Ti/O≤0,5, 2≤Ti/N≤5, 5≤O/B≤10 et 0,7≤(Ti+4B)/O≤1,5. Une structure fine d'un joint soudé de l'acier de construction pour le soudage comprend de la ferrite aciculaire ayant une fraction de structure d'au moins 85%. Dans le joint soudé, les oxydes TiO sont distribués de manière uniforme dans une structure à un intervalle maximal de 0,5μm et présentent une granulométrie comprise entre 0,01 et 0,1 μm. Le nombre d'oxydes TiO est au moins égal à 1,0x107/mm3. L'acier de construction pour le soudage présente de hautes caractéristiques de résistance pour le soudage à forte chaleur et utilise des oxydes TiO oxydes et du bore (B) soluble, de sorte que la transformation en ferrite aciculaire est accélérée dans une zone de métal soudé, ce qui assure d'excellentes propriétés DOEF au niveau du joint soudé.
PCT/KR2008/007604 2007-12-24 2008-12-23 Acier pour une structure de soudage comprenant un joint soudé ayant d'excellentes propriétés doef dans une zone affectée par la chaleur de soudage WO2009082156A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200880122473.1A CN101910437B (zh) 2007-12-24 2008-12-23 具有在焊接热影响区裂纹尖端张开位移性能优异的焊接接头的焊接结构用钢
JP2010540569A JP5303571B2 (ja) 2007-12-24 2008-12-23 Ｃｔｏｄ特性に優れた溶接継ぎ部を含む溶接構造用鋼

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020070136659A KR100957982B1 (ko) 2007-12-24 2007-12-24 Ｃｔｏｄ 특성이 우수한 용접이음부를 포함하는용접구조용강
KR10-2007-0136659 2007-12-24

Publications (1)

Publication Number Publication Date
WO2009082156A1 true WO2009082156A1 (fr) 2009-07-02

Family

ID=40801371

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2008/007604 WO2009082156A1 (fr) 2007-12-24 2008-12-23 Acier pour une structure de soudage comprenant un joint soudé ayant d'excellentes propriétés doef dans une zone affectée par la chaleur de soudage

Country Status (4)

Country Link
JP (1) JP5303571B2 (fr)
KR (1) KR100957982B1 (fr)
CN (1) CN101910437B (fr)
WO (1) WO2009082156A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3395988A4 (fr) * 2015-12-23 2019-02-27 Posco Tôle d'acier structural haute résistance présentant une excellente résistance à chaud et son procédé de fabrication

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101695982B1 (ko) * 2009-12-23 2017-01-12 주식회사 포스코 저온 충격인성이 우수한 고강도 서브머지드 아크 용접 금속부
KR101225339B1 (ko) * 2010-09-29 2013-01-23 한국생산기술연구원 용접열 영향부 인성이 우수한 대입열 용접용 강재
KR101351266B1 (ko) * 2011-10-21 2014-01-15 한양대학교 산학협력단 저온인성이 우수한 900ＭＰａ급 고강도 용접부
CN103147000B (zh) * 2013-03-20 2014-12-03 钢铁研究总院 多边形铁素体+针状铁素体双相钢板/带及生产方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60245768A (ja) * 1984-05-22 1985-12-05 Nippon Steel Corp 溶接用高靭性鋼
KR20020014133A (ko) * 2000-08-16 2002-02-25 이구택 용접열영향부 인성이 우수한 용접구조용 강재 및 그제조방법, 이를 이용한 용접구조물
JP2004124218A (ja) * 2002-10-07 2004-04-22 Jfe Steel Kk 靭性に優れた溶接金属を有するエレクトロスラグ溶接継手
KR20040058582A (ko) * 2002-12-27 2004-07-05 주식회사 포스코 대입열 용접열영향부 인성이 우수한 고강도 강재 및 그제조방법
JP2006124759A (ja) * 2004-10-27 2006-05-18 Kobe Steel Ltd 大入熱溶接継手靭性に優れた厚鋼板
KR20070068211A (ko) * 2005-12-26 2007-06-29 주식회사 포스코 대입열 용접에 적용되는 용접용 강재의 제조 방법 및대입열 용접에 의해 제조된 용접 구조물

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6240996A (ja) * 1985-08-20 1987-02-21 Nippon Steel Corp 低温用鋼用潜弧ワイヤ
JP3582461B2 (ja) * 1999-07-01 2004-10-27 住友金属工業株式会社 高強度溶接鋼管
JP3735001B2 (ja) * 2000-03-09 2006-01-11 株式会社神戸製鋼所 靱性に優れた溶接金属
JP2002018595A (ja) * 2000-07-03 2002-01-22 Nippon Steel Corp 低温用鋼の片面サブマージアーク溶接方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60245768A (ja) * 1984-05-22 1985-12-05 Nippon Steel Corp 溶接用高靭性鋼
KR20020014133A (ko) * 2000-08-16 2002-02-25 이구택 용접열영향부 인성이 우수한 용접구조용 강재 및 그제조방법, 이를 이용한 용접구조물
JP2004124218A (ja) * 2002-10-07 2004-04-22 Jfe Steel Kk 靭性に優れた溶接金属を有するエレクトロスラグ溶接継手
KR20040058582A (ko) * 2002-12-27 2004-07-05 주식회사 포스코 대입열 용접열영향부 인성이 우수한 고강도 강재 및 그제조방법
JP2006124759A (ja) * 2004-10-27 2006-05-18 Kobe Steel Ltd 大入熱溶接継手靭性に優れた厚鋼板
KR20070068211A (ko) * 2005-12-26 2007-06-29 주식회사 포스코 대입열 용접에 적용되는 용접용 강재의 제조 방법 및대입열 용접에 의해 제조된 용접 구조물

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3395988A4 (fr) * 2015-12-23 2019-02-27 Posco Tôle d'acier structural haute résistance présentant une excellente résistance à chaud et son procédé de fabrication

Also Published As

Publication number Publication date
KR20090068868A (ko) 2009-06-29
JP2011508087A (ja) 2011-03-10
CN101910437B (zh) 2012-12-12
CN101910437A (zh) 2010-12-08
KR100957982B1 (ko) 2010-05-17
JP5303571B2 (ja) 2013-10-02

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