EP3719162A4 - High strength steel material having excellent hydrogen-induced cracking resistance and low-temperature impact toughness and manufacturing method therefor - Google Patents

High strength steel material having excellent hydrogen-induced cracking resistance and low-temperature impact toughness and manufacturing method therefor Download PDF

Info

Publication number
EP3719162A4
EP3719162A4 EP18883591.2A EP18883591A EP3719162A4 EP 3719162 A4 EP3719162 A4 EP 3719162A4 EP 18883591 A EP18883591 A EP 18883591A EP 3719162 A4 EP3719162 A4 EP 3719162A4
Authority
EP
European Patent Office
Prior art keywords
manufacturing
low
high strength
steel material
strength steel
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.)
Pending
Application number
EP18883591.2A
Other languages
German (de)
French (fr)
Other versions
EP3719162A1 (en
Inventor
Kyung-Keun Um
Dae-Woo Kim
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 EP3719162A1 publication Critical patent/EP3719162A1/en
Publication of EP3719162A4 publication Critical patent/EP3719162A4/en
Pending legal-status Critical Current

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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • 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
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and 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
    • 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
    • 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
    • C21D8/0221—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
    • 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
    • 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
    • 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
    • C22C38/001—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
    • C22C38/02—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations
    • 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

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)
EP18883591.2A 2017-12-01 2018-07-27 High strength steel material having excellent hydrogen-induced cracking resistance and low-temperature impact toughness and manufacturing method therefor Pending EP3719162A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020170164465A KR102020434B1 (en) 2017-12-01 2017-12-01 Steel material having exellent hydrogen induced crack resistance and low temperature impact toughness and method of manufacturing the same
PCT/KR2018/008579 WO2019107700A1 (en) 2017-12-01 2018-07-27 High strength steel material having excellent hydrogen-induced cracking resistance and low-temperature impact toughness and manufacturing method therefor

Publications (2)

Publication Number Publication Date
EP3719162A1 EP3719162A1 (en) 2020-10-07
EP3719162A4 true EP3719162A4 (en) 2020-11-18

Family

ID=66664151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18883591.2A Pending EP3719162A4 (en) 2017-12-01 2018-07-27 High strength steel material having excellent hydrogen-induced cracking resistance and low-temperature impact toughness and manufacturing method therefor

Country Status (5)

Country Link
EP (1) EP3719162A4 (en)
JP (1) JP7197582B2 (en)
KR (1) KR102020434B1 (en)
CN (1) CN111492083B (en)
WO (1) WO2019107700A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2720284C1 (en) * 2019-08-16 2020-04-28 Публичное акционерное общество "Северсталь" (ПАО "Северсталь") Hot-rolled strip of high corrosion resistance from low-alloy steel and method of its production
JP7350705B2 (en) * 2020-10-05 2023-09-26 株式会社神戸製鋼所 Low-strength thick steel plate with excellent elongation properties and corrosion resistance
KR102487758B1 (en) 2020-12-18 2023-01-12 주식회사 포스코 Steel plate having excellent low temperature impact toughness and method for manufacturing the same
CN113025885A (en) * 2021-02-08 2021-06-25 江阴兴澄特种钢铁有限公司 Low-yield-ratio high-strength pipeline steel plate with good HIC (hydrogen induced cracking) resistance and manufacturing method thereof
CN113652608A (en) * 2021-07-28 2021-11-16 江苏省沙钢钢铁研究院有限公司 360 MPa-grade hydrogen-induced crack resistant steel plate and preparation method thereof
KR20230026794A (en) 2021-08-18 2023-02-27 주식회사 포스코 Steel material having high-strength and high-toughness, and method for manufacturing thereof
CN114574665B (en) * 2022-04-02 2023-09-26 鞍钢股份有限公司 Marine high-strength and high-toughness low-temperature steel with excellent fatigue performance and manufacturing method
CN115807188B (en) * 2022-11-23 2024-04-30 徐工集团工程机械股份有限公司 Low-carbon steel and preparation method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100815717B1 (en) * 2006-11-02 2008-03-20 주식회사 포스코 High strength linepipe steel plate for large diameter pipe with high low-temperature ductility and hic resistance at the h2s containing environment and manufacturing method thereof
KR20110060449A (en) * 2009-11-30 2011-06-08 주식회사 포스코 Pressure vessel steel plate with excellent low temperature toughness and hydrogen induced cracking resistance and manufacturing method thereof
KR20160075925A (en) * 2014-12-19 2016-06-30 주식회사 포스코 Pressure vessel steel plate with excellent hydrogen induced cracking resistance and low temperature toughness and manufacturing method thereof
KR20160078844A (en) * 2014-12-24 2016-07-05 주식회사 포스코 Steel sheet having excellent resistance to hydrogen induced cracking, and method of manufacturing the same
WO2017105107A1 (en) * 2015-12-15 2017-06-22 주식회사 포스코 High-strength steel material having excellent low-temperature strain aging impact properties and welding heat-affected zone impact properties and method for manufacturing same
WO2017105109A1 (en) * 2015-12-15 2017-06-22 주식회사 포스코 High-strength steel material having excellent low-temperature strain aging impact properties and method for manufacturing same

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4341396B2 (en) 2003-03-27 2009-10-07 Ｊｆｅスチール株式会社 High strength hot rolled steel strip for ERW pipes with excellent low temperature toughness and weldability
JP5423324B2 (en) * 2009-02-12 2014-02-19 新日鐵住金株式会社 Steel plate for high-strength line pipe and steel pipe for high-strength line pipe with excellent resistance to hydrogen-induced cracking
JP5347738B2 (en) 2009-06-11 2013-11-20 新日鐵住金株式会社 Method for producing precipitation strengthened cold rolled steel sheet
KR101271974B1 (en) * 2010-11-19 2013-06-07 주식회사 포스코 High-strength steel having excellent cryogenic toughness and method for production thereof
KR101403098B1 (en) * 2012-05-23 2014-06-03 주식회사 포스코 High strength thick hot rolled steel plate having exellent hydrogen induced crack resistance and method for manufacturing the same
KR20140118313A (en) * 2013-03-28 2014-10-08 현대제철 주식회사 Hot-rolled steel and method of manufacturing the same
JP6131872B2 (en) 2014-02-05 2017-05-24 Ｊｆｅスチール株式会社 High strength thin steel sheet and method for producing the same
WO2015151468A1 (en) * 2014-03-31 2015-10-08 Ｊｆｅスチール株式会社 Steel material for highly-deformable line pipes having superior strain aging characteristics and anti-hic characteristics, method for manufacturing same, and welded steel pipe
KR20150124810A (en) * 2014-04-29 2015-11-06 현대제철 주식회사 High strength steel sheet and method of manufacturing the same
JP6070642B2 (en) * 2014-06-20 2017-02-01 Ｊｆｅスチール株式会社 Hot-rolled steel sheet having high strength and excellent low-temperature toughness and method for producing the same
KR101736638B1 (en) 2015-12-23 2017-05-30 주식회사 포스코 Pressure vessel steel plate with excellent hydrogen induced cracking resistance and manufacturing method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100815717B1 (en) * 2006-11-02 2008-03-20 주식회사 포스코 High strength linepipe steel plate for large diameter pipe with high low-temperature ductility and hic resistance at the h2s containing environment and manufacturing method thereof
KR20110060449A (en) * 2009-11-30 2011-06-08 주식회사 포스코 Pressure vessel steel plate with excellent low temperature toughness and hydrogen induced cracking resistance and manufacturing method thereof
KR20160075925A (en) * 2014-12-19 2016-06-30 주식회사 포스코 Pressure vessel steel plate with excellent hydrogen induced cracking resistance and low temperature toughness and manufacturing method thereof
KR20160078844A (en) * 2014-12-24 2016-07-05 주식회사 포스코 Steel sheet having excellent resistance to hydrogen induced cracking, and method of manufacturing the same
WO2017105107A1 (en) * 2015-12-15 2017-06-22 주식회사 포스코 High-strength steel material having excellent low-temperature strain aging impact properties and welding heat-affected zone impact properties and method for manufacturing same
WO2017105109A1 (en) * 2015-12-15 2017-06-22 주식회사 포스코 High-strength steel material having excellent low-temperature strain aging impact properties and method for manufacturing same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2019107700A1 *

Also Published As

Publication number Publication date
CN111492083A (en) 2020-08-04
KR102020434B1 (en) 2019-09-10
WO2019107700A1 (en) 2019-06-06
JP2021504582A (en) 2021-02-15
CN111492083B (en) 2021-12-10
JP7197582B2 (en) 2022-12-27
KR20190065040A (en) 2019-06-11
EP3719162A1 (en) 2020-10-07

Similar Documents

Publication Publication Date Title
EP3719162A4 (en) High strength steel material having excellent hydrogen-induced cracking resistance and low-temperature impact toughness and manufacturing method therefor
EP3272899A4 (en) Low-yield-ratio high-strength-toughness thick steel plate with excellent low-temperature impact toughness and manufacturing method therefor
ZA202003349B (en) Steel sheet having excellent toughness, ductility and strength, and manufacturing method thereof
EP3561119A4 (en) Tempered martensitic steel having low yield ratio and excellent uniform elongation, and manufacturing method therefor
EP3733904A4 (en) Steel material showing excellent hydrogen-induced cracking resistance and method for preparing same
EP3730635A4 (en) High-strength steel sheet having excellent impact properties and formability and method for manufacturing same
EP3561110A4 (en) High manganese steel having superior low-temperature toughness and yield strength and manufacturing method
EP3730636A4 (en) High-strength steel sheet having excellent processability and method for manufacturing same
EP3896184A4 (en) High-strength steel sheet having excellent moldability and impact resistance, and method for manufacturing high-strength steel sheet having excellent moldability and impact resistance
EP3483297A4 (en) Hot forming member having excellent crack propagation resistance and ductility, and method for producing same
EP3712291A4 (en) Low-temperature steel plate having excellent impact toughness, and method for manufacturing same
EP3733909A4 (en) Hot-rolled steel sheet having excellent impact resistance, steel pipe, member, and manufacturing methods therefor
EP3733892A4 (en) Steel material, for pressure vessel, showing excellent hydrogen-induced cracking resistance and method for preparing same
EP3561120A4 (en) Austenite steel material having superb abrasion resistance and toughness, and method for producing same
EP3385401A4 (en) High-strength steel having excellent brittle crack arrestability and welding part brittle crack initiation resistance, and production method therefor
EP4056725A4 (en) Steel plate having high strength and excellent low-temperature impact toughness and method for manufacturing thereof
EP3561111A4 (en) Thick steel sheet having excellent cryogenic impact toughness and manufacturing method therefor
EP3889298A4 (en) High-strength steel with excellent durability and method for manufacturing same
EP3415654A4 (en) High-strength flat steel wire exhibiting superior hydrogen-induced crack resistance
EP3385402A4 (en) High-strength steel having excellent brittle crack arrestability and welding part brittle crack initiation resistance, and production method therefor
EP3889296A4 (en) High-strength steel sheet having excellent ductility and low-temperature toughness and method for manufacturing thereof
EP3561129A4 (en) Sour-resistant heavy-walled steel plate having excellent low-temperature toughness and post-heat treatment characteristics and method for manufacturing same
EP3392367A4 (en) High-strength steel material having excellent low-temperature strain aging impact properties and method for manufacturing same
EP3730640A4 (en) Thick steel plate having excellent low-temperature toughness and manufacturing method therefor
EP3674435A4 (en) Low-alloy steel sheet having excellent strength and ductility and manufacturing method therefor

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: 20200603

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: 20201019

RIC1 Information provided on ipc code assigned before grant

Ipc: C21D 8/02 20060101ALI20201013BHEP

Ipc: C22C 38/48 20060101ALI20201013BHEP

Ipc: C22C 38/44 20060101ALI20201013BHEP

Ipc: C22C 38/00 20060101ALI20201013BHEP

Ipc: C22C 38/02 20060101ALI20201013BHEP

Ipc: C22C 38/46 20060101ALI20201013BHEP

Ipc: C21D 9/46 20060101ALI20201013BHEP

Ipc: C22C 38/50 20060101ALI20201013BHEP

Ipc: C21D 1/28 20060101ALI20201013BHEP

Ipc: C22C 38/42 20060101AFI20201013BHEP

Ipc: C22C 38/06 20060101ALI20201013BHEP

Ipc: C21D 6/00 20060101ALI20201013BHEP

Ipc: C22C 38/04 20060101ALI20201013BHEP

Ipc: C22C 38/58 20060101ALI20201013BHEP

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: POSCO HOLDINGS INC.

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: POSCO CO., LTD