EP3239331A1 - Hochfester stahl mit hervorragender sprödbruchstablität und herstellungsverfahren dafür - Google Patents

Hochfester stahl mit hervorragender sprödbruchstablität und herstellungsverfahren dafür Download PDF

Info

Publication number
EP3239331A1
EP3239331A1 EP15873589.4A EP15873589A EP3239331A1 EP 3239331 A1 EP3239331 A1 EP 3239331A1 EP 15873589 A EP15873589 A EP 15873589A EP 3239331 A1 EP3239331 A1 EP 3239331A1
Authority
EP
European Patent Office
Prior art keywords
steel
strength steel
brittle crack
central portion
crack arrestability
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
EP15873589.4A
Other languages
English (en)
French (fr)
Other versions
EP3239331B1 (de
EP3239331A4 (de
Inventor
Hak-Cheol Lee
Sung-Ho Jang
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.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
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 Co Ltd filed Critical Posco Co Ltd
Publication of EP3239331A1 publication Critical patent/EP3239331A1/de
Publication of EP3239331A4 publication Critical patent/EP3239331A4/de
Application granted granted Critical
Publication of EP3239331B1 publication Critical patent/EP3239331B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • 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
    • 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
    • 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
    • C22C38/08—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
    • C22C38/12—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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • C21D2201/00—Treatment for obtaining particular effects
    • C21D2201/05—Grain orientation
    • 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
    • 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
    • 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
    • C21D2211/009—Pearlite
    • 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

Definitions

  • the present disclosure relates to a high-strength steel having excellent brittle crack arrestability and a method of manufacturing the same.
  • brittle crack arrestability referring to stability of a structure
  • a high-strength steel is applied to a major structure such as a ship, or the like
  • cases in which guaranteed levels of brittle crack arrestability are required have increased.
  • a low temperature transformation phase is generated in a central portion, a phenomenon in which brittle crack arrestability is significantly reduced occurs. Therefore, it may be difficult to improve brittle crack arrestability of an extremely thick high-strength steel.
  • An aspect of the present disclosure is to provide a high-strength steel having excellent brittle crack arrestability.
  • a high-strength steel having excellent brittle crack arrestability includes 0.05 wt% to 0.1 wt% of carbon (C), 0.9 wt% to 1.5 wt% of manganese (Mn), 0.8 wt% to 1.5 wt% of nickel (Ni), 0.005 wt% to 0.1 wt% of niobium (Nb), 0.005 wt% to 0.1 wt% of titanium (Ti), 0.1 wt% to 0.6 wt% of copper (Cu), 0.1 wt% to 0.4 wt% of silicon (Si), 100 ppm or less of phosphorous (P), 40 ppm or less of sulfur (S), and the remainder being iron (Fe) and other inevitably contained impurities, the high-strength steel having a microstructure including one structure selected from the group consisting of a single-phase structure of ferrite, a single-phase structure of bainite, a complex-
  • the contents of Cu and Ni may be set such that a Cu/Ni weight ratio may be 0.6 or less, in detail, 0.5 or less.
  • yield strength may be 390 MPa or more.
  • a method of manufacturing a high-strength steel having excellent brittle crack arrestability includes: reheating a slab at 950°C to 1100°C, the slab including 0.05 wt% to 0.1 wt % of carbon (C), 0.9 wt% to 1.5 wt% of manganese (Mn), 0.8 wt% to 1.
  • a crystal grain size of a central portion of the bar in a thickness direction before the finish rolling after the rough rolling may be 200 ⁇ m or less, preferably 150 ⁇ m or less, and more preferably 100 ⁇ m or less.
  • a reduction ratio during the finish rolling may be set such that a ratio of a slab thickness (mm)/a steel sheet thickness (mm) after finish rolling may be 3.5 or above, preferably 3.8 or above.
  • the cooling of the steel sheet may be performed at a cooling rate of a central portion of the steel sheet in a thickness direction of 2°C/s or more.
  • the cooling of the steel sheet may be performed at an average cooling rate from 3°C/s to 300°C/s.
  • a high-strength steel having high yield strength and excellent brittle crack arrestability may be obtained.
  • FIG. 1 is an image of a central portion of Inventive steel 1 in a thickness direction, captured with an optical microscope.
  • the inventors conducted research and experiments into improving yield strength and brittle crack arrestability of a thick steel having a thickness of 50 mm or more, and the present disclosure has been proposed based on the results thereof.
  • a steel composition, a structure, a texture, and manufacturing conditions of a steel are controlled, so yield strength and brittle crack arrestability of a steel having a thick thickness are further improved.
  • a main concept in the present disclosure is as follows.
  • a high-strength steel having excellent brittle crack arrestability includes 0.05 wt% to 0.1 wt% of C, 0.9 wt% to 1.5 wt% of Mn, 0.8 wt% to 1.5 wt% of Ni, 0.005 wt% to 0.1 wt% of Nb, 0.005 wt% to 0.1 wt% of Ti, 0.1 wt% to 0.6 wt% of Cu, 0.1 wt% to 0.4 wt% of Si, 100 ppm or less of P, 40 ppm or less of S, and the remainder being iron (Fe) and other inevitably contained impurities, and has a microstructure including one structure selected from the group consisting of a single-phase structure of ferrite, a single-phase structure of bainite, a complex-phase structure of ferrite and bainite, a complex-phase structure of ferrite and pearlite, and a complex-phase structure of ferrite
  • the content of C exceeds 0.10%, due to the generation of a large amount of martensite-austenite constituent (MA), high strength of ferrite itself, and generation of a large amount of a low temperature transformation phase, or the like, low temperature toughness may be reduced.
  • the content of C is preferably limited to 0.05% to 0.10%, more preferably limited to 0.061% to 0.091%, and most preferably limited to 0.065% to 0.085%.
  • Mn is a useful element for improving strength due to solid solution strengthening and for improving hardenability to allow a low temperature transformation phase to be generated.
  • Mn is preferably added in an amount of 0.9% or more.
  • Ni is an important element, allowing dislocation cross-slip to be easily performed at a low temperature to improve impact toughness, and improving hardenability to improve strength.
  • Ni is preferably added in an amount of 0.8% or more.
  • an upper limit of the content of Ni is preferably limited to 1.5%.
  • Nb is precipitated in the form of NbC or NbCN, thereby improving strength of a base material.
  • Cu is a main element in improving strength of a steel by improving hardenability and causing solid solution strengthening, and is a main element in increasing a yield strength due to generation of ⁇ (epsilon) Cu precipitate when tempering is applied.
  • Cu is preferably added in an amount of 0.1% or more.
  • an upper limit of the content of Cu is preferably limited to 0.6%.
  • iron (Fe) may be provided as a remainder thereof.
  • fraction of pearlite is preferably limited to 20% or less.
  • the grain size of a structure of a central portion of the steel is refined to be 30 ⁇ m or less, so strength is improved due to strengthening by grain refinement, while brittle crack arrestability is improved by significantly reducing the generation and propagation of cracks.
  • an area ratio of a (100) plane forming an angle within 15 degrees with respect to a plane perpendicular to a rolling direction is significantly reduced.
  • the steel has a thickness of 50 mm or more, preferably has a thickness of 50 mm to 100 mm, and more preferably has a thickness of 80 mm to 100 mm.
  • the slab, having been reheated, is rough rolled.
  • a total cumulative reduction ratio during rough rolling is preferably set to be 40% or more.
  • a microstructure, yield strength, an average grain size of a central portion measured in EBSD, an area ratio of a (100) plane forming an angle within 15 degrees with respect to a plane perpendicular to a rolling direction in a region of the high-strength steel in a range of 20% of an overall steel thickness based on a position equal to 1/2 of the steel thickness, a Kca value (a brittle crack arrestability coefficient) were investigated, and a result thereof is illustrated in Table 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
EP15873589.4A 2014-12-24 2015-12-21 Hochfester stahl mit hervorragender sprödbruchstablität und herstellungsverfahren dafür Active EP3239331B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20140189132 2014-12-24
PCT/KR2015/014054 WO2016105062A1 (ko) 2014-12-24 2015-12-21 취성균열전파 저항성이 우수한 고강도 강재 및 그 제조방법

Publications (3)

Publication Number Publication Date
EP3239331A1 true EP3239331A1 (de) 2017-11-01
EP3239331A4 EP3239331A4 (de) 2017-11-08
EP3239331B1 EP3239331B1 (de) 2020-10-28

Family

ID=56151008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15873589.4A Active EP3239331B1 (de) 2014-12-24 2015-12-21 Hochfester stahl mit hervorragender sprödbruchstablität und herstellungsverfahren dafür

Country Status (6)

Country Link
US (1) US20170327922A1 (de)
EP (1) EP3239331B1 (de)
JP (1) JP6788589B2 (de)
KR (1) KR101746999B1 (de)
CN (1) CN107109597B (de)
WO (1) WO2016105062A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018024910A (ja) * 2016-08-09 2018-02-15 Ｊｆｅスチール株式会社 高強度厚鋼板およびその製造方法
EP3561112A4 (de) * 2016-12-22 2019-10-30 Posco Ultradickes stahlmaterial mit hervorragenden nrl-dwt-eigenschaften des oberflächenteils und verfahren zur herstellung davon

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10822671B2 (en) 2014-12-24 2020-11-03 Posco High-strength steel having superior brittle crack arrestability, and production method therefor
CN107109592A (zh) 2014-12-24 2017-08-29 Posco公司 耐脆性裂纹扩展性优异的高强度钢材及其制造方法
KR102209561B1 (ko) * 2018-11-30 2021-01-28 주식회사 포스코 취성균열전파 저항성이 우수한 극후물 강재 및 그 제조방법
KR102209547B1 (ko) * 2018-12-19 2021-01-28 주식회사 포스코 취성균열개시 저항성이 우수한 구조용 극후물 강재 및 그 제조방법

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04180521A (ja) * 1990-11-14 1992-06-26 Kobe Steel Ltd 高降伏強度高靭性厚肉高張力鋼板の製造方法
JP3211046B2 (ja) * 1994-09-07 2001-09-25 新日本製鐵株式会社 溶接継手部の脆性破壊伝播停止性能の優れた溶接構造用厚鋼板の製造方法
JP3749616B2 (ja) * 1998-03-26 2006-03-01 新日本製鐵株式会社 超大入熱溶接熱影響部の靱性に優れた溶接用高張力鋼
JP4830330B2 (ja) * 2005-03-25 2011-12-07 Ｊｆｅスチール株式会社 厚肉低降伏比高張力鋼板の製造方法
KR100723201B1 (ko) * 2005-12-16 2007-05-29 주식회사 포스코 다층용접부 인성이 우수한 고강도 고인성 강 및 그제조방법
KR100660230B1 (ko) * 2005-12-26 2006-12-21 주식회사 포스코 두께 중심부의 강도와 인성이 우수한 용접구조용 극후물강판 및 그 제조방법
JP4058097B2 (ja) * 2006-04-13 2008-03-05 新日本製鐵株式会社 アレスト性に優れた高強度厚鋼板
JP5064150B2 (ja) * 2006-12-14 2012-10-31 新日本製鐵株式会社 脆性き裂伝播停止性能に優れた高強度厚鋼板
JP4309946B2 (ja) * 2007-03-05 2009-08-05 新日本製鐵株式会社 脆性き裂伝播停止特性に優れた厚手高強度鋼板およびその製造方法
KR100957964B1 (ko) * 2007-12-26 2010-05-17 주식회사 포스코 용접열영향부의 저온인성과 인장강도가 우수한 고강도저항복비 구조용 강재 및 그 제조방법
TW201036746A (en) * 2009-01-14 2010-10-16 Nippon Steel Corp Weld dtructure having brittle fracture arresting characterstics
KR101360737B1 (ko) * 2009-12-28 2014-02-07 주식회사 포스코 취성 균열 발생 저항성이 우수한 고강도 강판 및 그 제조방법
KR20120075274A (ko) * 2010-12-28 2012-07-06 주식회사 포스코 극저온 인성이 우수한 고강도 강판 및 그 제조방법
JP5598485B2 (ja) * 2011-02-08 2014-10-01 Ｊｆｅスチール株式会社 長大脆性き裂伝播停止特性に優れる板厚５０ｍｍ以上の厚鋼板およびその製造方法
JP5304925B2 (ja) * 2011-12-27 2013-10-02 Ｊｆｅスチール株式会社 脆性亀裂伝播停止特性に優れた構造用高強度厚鋼板およびその製造方法
JP5733425B2 (ja) * 2011-12-27 2015-06-10 Ｊｆｅスチール株式会社 脆性き裂伝播停止特性に優れた高強度厚鋼板およびその製造方法
TWI463018B (zh) * 2012-04-06 2014-12-01 Nippon Steel & Sumitomo Metal Corp 具優異裂縫阻滯性之高強度厚鋼板
JP2013221189A (ja) * 2012-04-17 2013-10-28 Nippon Steel & Sumitomo Metal Corp 脆性亀裂伝播停止性能に優れた高強度厚鋼板
JP2013221190A (ja) * 2012-04-17 2013-10-28 Nippon Steel & Sumitomo Metal Corp 脆性亀裂伝播停止性能に優れた高強度厚鋼板
KR20130134333A (ko) * 2012-05-30 2013-12-10 현대제철 주식회사 고강도 강판 및 그 제조 방법
KR20140098900A (ko) * 2013-01-31 2014-08-11 현대제철 주식회사 고강도 극후물 강판 및 그 제조 방법
US10822671B2 (en) * 2014-12-24 2020-11-03 Posco High-strength steel having superior brittle crack arrestability, and production method therefor
CN107109592A (zh) * 2014-12-24 2017-08-29 Posco公司 耐脆性裂纹扩展性优异的高强度钢材及其制造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018024910A (ja) * 2016-08-09 2018-02-15 Ｊｆｅスチール株式会社 高強度厚鋼板およびその製造方法
EP3561112A4 (de) * 2016-12-22 2019-10-30 Posco Ultradickes stahlmaterial mit hervorragenden nrl-dwt-eigenschaften des oberflächenteils und verfahren zur herstellung davon

Also Published As

Publication number Publication date
EP3239331B1 (de) 2020-10-28
WO2016105062A1 (ko) 2016-06-30
CN107109597A (zh) 2017-08-29
CN107109597B (zh) 2020-01-31
WO2016105062A8 (ko) 2016-11-24
EP3239331A4 (de) 2017-11-08
KR101746999B1 (ko) 2017-06-15
JP2018503744A (ja) 2018-02-08
US20170327922A1 (en) 2017-11-16
JP6788589B2 (ja) 2020-11-25
KR20160078926A (ko) 2016-07-05

Similar Documents

Publication Publication Date Title
EP3239332B1 (de) Hochfester stahl mit hervorragender sprödbruchstablität und herstellungsverfahren dafür
US10822671B2 (en) High-strength steel having superior brittle crack arrestability, and production method therefor
EP3239331B1 (de) Hochfester stahl mit hervorragender sprödbruchstablität und herstellungsverfahren dafür
EP3385401B1 (de) Hochfester stahl mit ausgezeichneter sprödbruchstabilität und schweissteilsprödbruchbeständigkeit und herstellungsverfahren dafür
KR101159824B1 (ko) 제관용 고강도 박강판 및 그 제조 방법
EP3561111B1 (de) Dickes stahlblech mit hervorragender kryogener schlagfestigkeit und herstellungsverfahren dafür
EP3385402B1 (de) Hochfester stahl mit ausgezeichneter sprödbruchstabilität und schweissteile mit sprödbruchstabilität und herstellungsverfahren dafür
EP3561113B1 (de) Ultradickes stahlmaterial mit hervorragenden nrl-dwt-eigenschaften des oberflächenteils und verfahren zur herstellung davon
EP3480332B1 (de) Hochfeste stahlplatte mit hervorragendem niedrigem streckgrenzenverhältnis und kältezähigkeit und verfahren zur herstellung davon
CN109563599B (zh) 耐脆性裂纹扩展性优异的超厚钢材及其制造方法
KR101585724B1 (ko) 중심부 저온 파괴전파 저항성 및 항복비 특성이 동시에 우수한 후물 라인파이프 강재 및 그 제조방법
EP3561107A1 (de) Stahlblech mit niedriger streckgrenze, hervorragender tieftemperaturzähigkeit und verfahren zur herstellung davon
KR101657840B1 (ko) 취성균열전파 저항성이 우수한 고강도 강재 및 그 제조방법
KR20150075292A (ko) 중심부에서의 파괴전파 정지특성이 우수한 라인파이프용 고강도 후물 강재 및 그 제조방법
EP3901305B1 (de) Hochfester baustahl mit ausgezeichneter kaltbiegefähigkeit und verfahren zu seiner herstellung
JP2020509168A (ja) 表面部ｎｒｌ−落重試験物性に優れた極厚鋼材及びその製造方法
EP3239329B1 (de) Ultradicker baustahl mit ausgezeichneter beständigkeit gegen sprödrissausbreitung und herstellungsverfahren dafür
EP3395988A1 (de) Hochfestes baustahlblech mit hervorragender hitzebeständigkeit und herstellungsverfahren dafür

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170712

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

A4 Supplementary search report drawn up and despatched

Effective date: 20171010

RIC1 Information provided on ipc code assigned before grant

Ipc: C21D 8/00 20060101ALI20171002BHEP

Ipc: C22C 38/02 20060101ALI20171002BHEP

Ipc: C21D 8/02 20060101ALI20171002BHEP

Ipc: C22C 38/04 20060101AFI20171002BHEP

Ipc: C22C 38/16 20060101ALI20171002BHEP

Ipc: C22C 38/08 20060101ALI20171002BHEP

Ipc: C22C 38/12 20060101ALI20171002BHEP

Ipc: C21D 6/00 20060101ALI20171002BHEP

Ipc: C22C 38/14 20060101ALI20171002BHEP

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20181001

RIC1 Information provided on ipc code assigned before grant

Ipc: C22C 38/08 20060101ALI20200212BHEP

Ipc: C22C 38/12 20060101ALI20200212BHEP

Ipc: C22C 38/16 20060101ALI20200212BHEP

Ipc: C21D 6/00 20060101ALI20200212BHEP

Ipc: C22C 38/14 20060101ALI20200212BHEP

Ipc: C22C 38/00 20060101ALI20200212BHEP

Ipc: C22C 38/02 20060101ALI20200212BHEP

Ipc: C22C 38/04 20060101AFI20200212BHEP

Ipc: C21D 9/46 20060101ALI20200212BHEP

Ipc: C21D 8/02 20060101ALI20200212BHEP

Ipc: C21D 8/00 20060101ALI20200212BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20200325

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAJ Information related to disapproval of communication of intention to grant by the applicant or resumption of examination proceedings by the epo deleted

Free format text: ORIGINAL CODE: EPIDOSDIGR1

GRAL Information related to payment of fee for publishing/printing deleted

Free format text: ORIGINAL CODE: EPIDOSDIGR3

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

INTC Intention to grant announced (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: POSCO

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LEE, HAK-CHEOL

Inventor name: JANG, SUNG-HO

GRAR Information related to intention to grant a patent recorded

Free format text: ORIGINAL CODE: EPIDOSNIGR71

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

INTG Intention to grant announced

Effective date: 20200917

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602015061310

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1328301

Country of ref document: AT

Kind code of ref document: T

Effective date: 20201115

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: NL

Ref legal event code: FP

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1328301

Country of ref document: AT

Kind code of ref document: T

Effective date: 20201028

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210129

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210128

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210301

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210128

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210228

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602015061310

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20201231

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20210128

26N No opposition filed

Effective date: 20210729

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201221

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201231

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201231

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210128

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210228

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201028

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201231

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 602015061310

Country of ref document: DE

Owner name: POSCO CO., LTD, POHANG-SI, KR

Free format text: FORMER OWNER: POSCO, POHANG-SI, GYEONGSANGBUK-DO, KR

Ref country code: DE

Ref legal event code: R081

Ref document number: 602015061310

Country of ref document: DE

Owner name: POSCO CO., LTD, POHANG- SI, KR

Free format text: FORMER OWNER: POSCO, POHANG-SI, GYEONGSANGBUK-DO, KR

Ref country code: DE

Ref legal event code: R081

Ref document number: 602015061310

Country of ref document: DE

Owner name: POSCO HOLDINGS INC., KR

Free format text: FORMER OWNER: POSCO, POHANG-SI, GYEONGSANGBUK-DO, KR

REG Reference to a national code

Ref country code: NL

Ref legal event code: PD

Owner name: POSCO HOLDINGS INC.; KR

Free format text: DETAILS ASSIGNMENT: CHANGE OF OWNER(S), CHANGE OF LEGAL ENTITY; FORMER OWNER NAME: POSCO

Effective date: 20221026

REG Reference to a national code

Ref country code: NL

Ref legal event code: PD

Owner name: POSCO CO., LTD; KO

Free format text: DETAILS ASSIGNMENT: CHANGE OF OWNER(S), ASSIGNMENT; FORMER OWNER NAME: POSCO

Effective date: 20221109

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 602015061310

Country of ref document: DE

Owner name: POSCO CO., LTD, POHANG-SI, KR

Free format text: FORMER OWNER: POSCO HOLDINGS INC., SEOUL, KR

Ref country code: DE

Ref legal event code: R081

Ref document number: 602015061310

Country of ref document: DE

Owner name: POSCO CO., LTD, POHANG- SI, KR

Free format text: FORMER OWNER: POSCO HOLDINGS INC., SEOUL, KR

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20231024

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20231024

Year of fee payment: 9

Ref country code: DE

Payment date: 20231023

Year of fee payment: 9