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1. (WO2017111407) HIGH YIELD RATIO TYPE HIGH-STRENGTH COLD-ROLLED STEEL SHEET AND MANUFACTURING METHOD THEREOF
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2017/111407 International Application No.: PCT/KR2016/014856
Publication Date: 29.06.2017 International Filing Date: 19.12.2016
IPC:
C22C 38/38 (2006.01) ,C22C 38/32 (2006.01) ,C22C 38/28 (2006.01) ,C22C 38/26 (2006.01) ,C22C 38/06 (2006.01) ,C22C 38/02 (2006.01) ,C22C 38/00 (2006.01) ,C21D 8/02 (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
18
containing chromium
38
with more than 1.5% by weight of 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
18
containing chromium
32
with boron
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
18
containing chromium
28
with 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
18
containing chromium
26
with niobium or tantalum
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
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
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
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
02
during manufacturing of plates or strips
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:
구민서 KOO, Min-Seo; KR
한성호 HAN, Seong-Ho; KR
Agent:
특허법인 씨엔에스 C&S PATENT AND LAW OFFICE; 서울시 강남구 언주로30길 13 대림아크로텔 7층 7th Floor, Daelim Acrotel 13, Eonju-ro 30-gil Gangnam-gu, Seoul 06292, KR
Priority Data:
10-2015-018550223.12.2015KR
Title (EN) HIGH YIELD RATIO TYPE HIGH-STRENGTH COLD-ROLLED STEEL SHEET AND MANUFACTURING METHOD THEREOF
(FR) TÔLE D'ACIER HAUTE RÉSISTANCE LAMINÉE À FROID DE TYPE À HAUTE LIMITE D'ÉLASTICITÉ ET SON PROCÉDÉ DE FABRICATION
(KO) 고항복비형 고강도 냉연강판 및 그 제조방법
Abstract:
(EN) A preferred aspect of the present invention is a cold-rolled steel sheet manufactured by a cold-rolled steel sheet manufacturing method comprising a continuous annealing step, which has a composition comprising, in percentage by weight: C: 0.1-0.15%; Si: 0.2% or less (including 0%); Mn: 2.3-3.0%; P: 0.001-0.10%; S: 0.010% or less (including 0%); Sol.Al: 0.01-0.10%; N: 0.010% or less (excluding 0%); Cr: 0.3-0.9%; B: 0.0010-0.0030%; Ti: 0.01-0.03%; Nb:0.01-0.03%; the balance being Fe and other impurities, and satisfies following relational expression (1). [Relational expression 1] 1650 ≤ 5541.4C + 239Mn + 169.1Cr + 0.74SS - 1.36RCS ≤ 1688 [wherein C, Mn and Cr are values representing the contents of the respective elements in weight%, SS represents a continuous annealing temperature (℃), and RCS represents a cooling end temperature (℃) in continuous annealing]. The present invention provides a high yield ratio type high strength cold-rolled steel sheet and the manufacturing method thereof, in which microstructure comprises, in area percentage, at least 90% of martensite and tempered martensite; and 10% or less of ferrite and bainite, in which the fraction of the tempered martensite in the martensite and the tempered martensite is 90% or more, in area percentage, and the ratio (b/a) of the C + Mn concentration (a) in the martensite to the C + Mn concentration (b) in the ferrite and the bainite is 0.65 or more.
(FR) Un aspect préféré de la présente invention concerne une tôle d'acier laminée à froid fabriquée par un procédé de fabrication de tôle d'acier laminée à froid comprenant une étape de recuit continu, qui présente une composition comprenant, en pourcentage en poids : C : 0,1 à 0,15 %; Si : 0,2 % ou moins (y compris 0 %); Mn : 2,3 à 3,0 %; P : 0,001 à 0,10 %; S : 0,010 % ou moins (y compris 0 %), Al sol. : 0,01 à 0,10 %; N : 0,010 % ou moins (0 % exclus); Cr : 0,3 à 0,9 %; B : 0,0010 à 0,0030 %; Ti : 0,01 à 0,03 %; Nb : 0,01 à 0,03 %; le reste étant du Fe et les inévitables impuretés, et satisfaisant l'expression de relation suivante : [Expression de relation 1] 1650 ≤ 5541,4C + 239Mn + 169,1Cr + 0,74SS - 1,36RCS ≤ 1688 [où C, Mn et Cr sont des valeurs représentant la teneur des éléments respectifs en % en poids, SS représente une température de recuit continu (℃) et RCS représente une température finale de refroidissement (℃) dans le recuit continu]. L'invention permet d'obtenir une tôle d'acier haute résistance laminée à froid de type à haute limite d'élasticité et son procédé de fabrication, la microstructure de ladite tôle comprenant, en pourcentage de surface, au moins 90 % de martensite et de martensite revenue; et 10 % ou moins de ferrite et de bainite, la fraction de la martensite revenue dans la martensite et la martensite revenue étant supérieure ou égale à 90 %, en pourcentage de surface, et le rapport (b/a) de la concentration de C + Mn (a) dans la martensite à la concentration de C + Mn (b) dans la ferrite et la bainite étant supérieur ou égal à 0,65.
(KO) 본 발명의 바람직한 일측면은 연속소둔공정을 포함하는 냉연강판의 제조방법에 의해 제조되는 냉연강판으로서, 중량%로, C: 0.1~0.15%, Si: 0.2%이하(0% 포함), Mn: 2.3~3.0%, P: 0.001~0.10%, S:0.010%이하(0% 포함), Sol.Al: 0.01~0.10%, N: 0.010%이하(0%는 제외), Cr: 0.3~0.9%, B:0.0010-0.0030%, Ti: 0.01-0.03%, Nb:0.01-0.03%, 나머지 Fe 및 기타의 불순물을 포함하고, 하기 관계식(1)을 만족하고, [관계식 1] 1650 ≤ 5541.4C + 239Mn + 169.1Cr + 0.74SS - 1.36RCS ≤1688 [여기서, C, Mn 및 Cr은 각 원소들의 함유량을 중량%로 나타낸 값이고, SS는 연속소둔온도(℃)를 나타내고, RCS는 연속소둔 시 냉각종료온도(℃)를 나타냄] 미세조직은 면적 %로, 90%이상의 마르텐사이트 및 템퍼드 마르텐사이트; 및 10%이하의 페라이트 및 베이나이트를 포함하고, 마르텐사이트와 템퍼드 마르텐사이트 중 템퍼드 마르텐사이트의 분율은 면적 %로, 90%이상이고, 그리고 상기 마르텐사이트내 C+Mn 농도(a)와 페라이트 및 베이나이트내 C+Mn 농도(b)의 비율(b/a)이 0.65이상인 고항복비형 고강도 냉연강판 및 그 제조방법을 제공한다.
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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 Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (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)
Also published as:
CN108431280EP3395993US20180363090