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1. WO2020111860 - ULTRA-THICK STEEL EXCELLENT IN BRITTLE CRACK ARRESTABILITY AND MANUFACTURING METHOD THEREFOR

Publication Number WO/2020/111860
Publication Date 04.06.2020
International Application No. PCT/KR2019/016702
International Filing Date 29.11.2019
IPC
C22C 38/04 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
04containing manganese
C22C 38/08 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
08containing nickel
C22C 38/12 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
12containing tungsten, tantalum, molybdenum, vanadium or niobium
C22C 38/14 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
14containing titanium or zirconium
C22C 38/16 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
16containing copper
C21D 8/02 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
CPC
C21D 8/02
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
C22C 38/04
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
04containing manganese
C22C 38/08
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
08containing nickel
C22C 38/12
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
12containing tungsten, tantalum, molybdenum, vanadium, or niobium
C22C 38/14
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
14containing titanium or zirconium
C22C 38/16
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
16containing copper
Applicants
  • 주식회사 포스코 POSCO [KR]/[KR]
Inventors
  • 이학철 LEE, Hak-Cheol
Agents
  • 특허법인 씨엔에스 C&S PATENT AND LAW OFFICE
Priority Data
10-2018-015187130.11.2018KR
Publication Language Korean (KO)
Filing Language Korean (KO)
Designated States
Title
(EN) ULTRA-THICK STEEL EXCELLENT IN BRITTLE CRACK ARRESTABILITY AND MANUFACTURING METHOD THEREFOR
(FR) ACIER ULTRA-ÉPAIS PRÉSENTANT UNE EXCELLENTE RÉSISTANCE AUX FISSURES FRAGILES ET SON PROCÉDÉ DE FABRICATION
(KO) 취성균열전파 저항성이 우수한 극후물 강재 및 그 제조방법
Abstract
(EN)
An ultra-thick steel excellent in brittle crack arrestability according to an aspect of the present invention comprises, by weight, C: 0.02-0.07%, Mn: 1.8-2.2%, Ni: 0.7-1.2%, Nb: 0.005-0.02%, Ti: 0.005-0.02%, Cu: 0.1-0.4%, P: 0.01% or less, S: 0.004% or less, and the balance of Fe and inevitable impurities, wherein crystal grains that have a high angle grain boundary of 15 degrees or more, as measured by EBSD, may have an average grain size of 15㎛ or less in the t/4-(3*t)/8 region (wherein t represents a thickness of the steel, the same below).
(FR)
Selon un aspect de la présente invention, un acier ultra-épais présentant une excellente résistance aux fissures fragiles comprend, en poids, C: de 0,02 à 0,07% ; Mn: de 1,8 à 2,2%, Ni: de 0,7 à 1,2%, Nb: de 0,005 à 0,02%, Ti: de 0,005 à 0,02% ; Cu: de 0,1 À 0,4% de P: 0,01% ou moins, S: 0,004 % ou moins, et le reste étant du Fe et les impuretés inévitables, les grains cristallins qui ont une limite de grain à angle élevé de 15 degrés ou plus, telle que mesurée par EBSD, peuvent avoir une taille de grain moyenne de 15 µm ou moins dans la région t/4-(3*t)/8 (où t représente une épaisseur de l'acier, comme présenté ci-dessous).
(KO)
본 발명의 일 측면에 따른 취성균열전파 저항성이 우수한 극후물 강재는, 중량%로, C: 0.02~0.07%, Mn: 1.8~2.2%, Ni: 0.7~1.2%, Nb: 0.005~0.02%, Ti: 0.005~0.02%, Cu: 0.1~0.4%, P: 0.01% 이하, S: 0.004% 이하, 나머지 Fe 및 불가피한 불순물을 포함하고, t/4~(3*t)/8 영역(여기서, t는 강재 두께를 의미함, 이하 동일)에서 EBSD로 측정한 15도 이상의 고경계각을 가지는 결정립의 평균 입도가 15㎛ 이하일 수 있다.
Also published as
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