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1. (WO2018004297) HIGH STRENGTH STEEL PLATE HAVING EXCELLENT LOW YIELD RATIO CHARACTERISTICS AND LOW TEMPERATURE TOUGHNESS AND METHOD FOR MANUFACTURING SAME
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Pub. No.: WO/2018/004297 International Application No.: PCT/KR2017/006956
Publication Date: 04.01.2018 International Filing Date: 30.06.2017
IPC:
C22C 38/00 (2006.01) ,C22C 38/02 (2006.01) ,C22C 38/04 (2006.01) ,C22C 38/06 (2006.01) ,C22C 38/08 (2006.01) ,C22C 38/12 (2006.01) ,C22C 38/14 (2006.01) ,C22C 38/16 (2006.01) ,C21D 1/28 (2006.01)
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
02
containing silicon
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
04
containing manganese
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
06
containing aluminium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
08
containing nickel
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
12
containing tungsten, tantalum, molybdenum, vanadium or niobium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
14
containing titanium or zirconium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
16
containing copper
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
26
Methods of annealing
28
Normalising
Applicants:
주식회사 포스코 POSCO [KR/KR]; 경상북도 포항시 남구 동해안로 6261 (괴동동) (Goedong-dong) 6261, Donghaean-ro, Nam-gu Pohang-si Gyeongsangbuk-do 37859, KR
Inventors:
김우겸 KIM, Woo-Gyeom; KR
방기현 BANG, Ki-Hyun; KR
엄경근 UM, Kyung-Keun; KR
유승호 YU, Seng-Ho; KR
Agent:
특허법인 씨엔에스 C&S PATENT AND LAW OFFICE; 서울시 강남구 언주로 30길 13, 대림아크로텔 7층 7th Floor, Daelim Acrotel 13, Eonju-ro 30-gil Gangnam-gu Seoul 06292, KR
Priority Data:
10-2016-008358801.07.2016KR
Title (EN) HIGH STRENGTH STEEL PLATE HAVING EXCELLENT LOW YIELD RATIO CHARACTERISTICS AND LOW TEMPERATURE TOUGHNESS AND METHOD FOR MANUFACTURING SAME
(FR) PLAQUE D'ACIER À HAUTE RÉSISTANCE PRÉSENTANT D'EXCELLENTES CARACTÉRISTIQUES DE FAIBLE COEFFICIENT D'ÉLASTICITÉ ET UNE TÉNACITÉ À BASSE TEMPÉRATURE ET SON PROCÉDÉ DE FABRICATION
(KO) 저항복비 특성 및 저온인성이 우수한 고강도 강판 및 그 제조방법
Abstract:
(EN) One aspect of the present invention relates to a high strength steel plate having excellent low yield ratio characteristics and low temperature toughness, comprising, by weight %: C: 0.03 to 0.08%; Si: 0.05 to 0.3%; Mn: 1.0 to 2.0%; Al: 0.005 to 0.04%; Nb: 0.005 to 0.04%; Ti: 0.001 to 0.02%; Cu: 0.05 to 0.4%; Ni: 0.6 to 2.0%; Mo: 0.08 to 0.3%; N: 0.002 to 0.006%; P: 0.01% or less; S: 0.003% or less; and the remainder being Fe and unavoidable impurities, in which a microstructure contains, by area fraction, 80 to 92% of ferrite, 8 to 20% of a martensite/austenite mixed structure (MA), wherein the MA has an average size measured as a circle-equivalent diameter of 3 ㎛ or less.
(FR) Un aspect de la présente invention concerne une plaque d'acier à haute résistance présentant d'excellentes caractéristiques de faible coefficient d'élasticité et une ténacité à basse température comprenant, en % en poids : C : 0,03 à 0,08 % ; Si : 0,05 à 0,3 % ; Mn : 1,0 à 2,0 % ; Al : 0,005 à 0,04 % ; Nb : 0,005 à 0,04 % ; Ti : 0,001 à 0,02 % ; Cu : 0,05 à 0,4 % ; Ni : 0,6 à 2,0 % ; Mo : 0,08 à 0,3 % ; N : 0,002 à 0,006 % ; P : 0,01 % ou moins ; S : 0,003 % ou moins ; et le reste étant du Fe et des impuretés inévitables, dans laquelle une microstructure contient, par fraction de surface, 80 à 92 % de ferrite, 8 à 20 % d'une structure mixte martensite/austénite (MA), la MA présentant une dimension moyenne mesurée en tant que diamètre équivalent en cercle de 3 µm ou moins.
(KO) 본 발명의 일 측면은 중량%로, C: 0.03~0.08%, Si: 0.05~0.3%, Mn: 1.0~2.0%, Al: 0.005~0.04%, Nb: 0.005~0.04%, Ti: 0.001~0.02%, Cu: 0.05~0.4%, Ni: 0.6~2.0%, Mo: 0.08~0.3%, N: 0.002~0.006%, P: 0.01% 이하, S: 0.003% 이하, 나머지 Fe 및 불가피한 불순물을 포함하며, 미세조직은 면적분율로 페라이트를 80~92%, MA(마르텐사이트/오스테나이트 혼합조직)를 8~20% 포함하고, 상기 MA는 원상당 직경으로 측정한 평균크기가 3㎛이하인 저항복비 특성 및 저온인성이 우수한 고강도 강판에 관한 것이다.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Korean (KO)
Filing Language: Korean (KO)