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1. (WO2019031681) HOT ROLLED STEEL SHEET HAVING EXCELLENT STRENGTH AND ELONGATION, AND MANUFACTURING METHOD
Latest bibliographic data on file with the International BureauSubmit observation

Pub. No.: WO/2019/031681 International Application No.: PCT/KR2018/004271
Publication Date: 14.02.2019 International Filing Date: 12.04.2018
IPC:
C22C 38/04 (2006.01) ,C22C 38/02 (2006.01) ,C22C 38/06 (2006.01) ,C22C 38/12 (2006.01) ,C21D 8/02 (2006.01) ,C21D 9/46 (2006.01) ,C21D 1/18 (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
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
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
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
12
containing tungsten, tantalum, molybdenum, vanadium or niobium
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
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
9
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor
46
for sheet metals
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
18
Hardening; Quenching with or without subsequent tempering
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
포항공과대학교 산학협력단 POSTECH ACADEMY-INDUSTRY FOUNDATION [KR/KR]; 경상북도 포항시 남구 청암로 77 77 Cheongam-ro, Nam-gu Pohang-si, Gyeongsangbuk-do 37673, KR
Inventors:
이성학 LEE, Sung-Hak; KR
이규영 LEE, Kyoo-young; KR
류주현 RYU, Joo-Hyun; KR
이세웅 LEE, Sea-Woong; KR
손석수 SOHN, Seok-Su; KR
이형수 LEE, Hyung-Soo; KR
조민철 JO, Min-Chul; 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:
10-2017-010039008.08.2017KR
Title (EN) HOT ROLLED STEEL SHEET HAVING EXCELLENT STRENGTH AND ELONGATION, AND MANUFACTURING METHOD
(FR) TÔLE D'ACIER LAMINÉE À CHAUD DOTÉE D'EXCELLENTES PROPRIÉTÉS DE RÉSISTANCE ET D'ALLONGEMENT ET PROCÉDÉ DE FABRICATION
(KO) 우수한 강도와 연신율을 갖는 열연강판 및 제조방법
Abstract:
(EN) The purpose of one aspect of the present invention is to provide a hot rolled steel sheet having excellent strength and elongation by using manganese segregation, and a manufacturing method. One embodiment of the present invention provides: a hot rolled steel sheet having excellent strength and elongation, comprising, by wt%, C in an amount greater than or equal to 0.05% and less than 0.4%, 10-15% of Mn, 2% or less of Al, 0.1-2% of Si, 0.5% or less of Mo (excluding 0), 0.5% or less of V (excluding 0), 0.01% or less of P, 0.01% or less of S and the balance of Fe and other inevitable impurities, and having a microstructure comprising, by area%, 50-75% of tempered martensite, 20% or less of secondary martensite (excluding 0), 2% or less of ε-martensite (excluding 0) and 8-30% of retained austenite; and a manufacturing method therefor. According to one aspect of the present invention, provided are a hot rolled steel sheet having a tensile strength of 1,500 MPa or more, a yield strength of 900 MPa or more and an elongation of 20% or more, and a manufacturing method therefor.
(FR) L'objectif d'un aspect de la présente invention est de fournir une tôle d'acier laminée à chaud présentant d'excellentes propriété de résistance et d'allongement, par utilisation d'une ségrégation du manganèse et un procédé de fabrication. Un mode de réalisation de la présente invention concerne : une tôle d'acier laminée à chaud ayant une excellente résistance et un excellent allongement, comprenant, en % en poids, C en une quantité supérieure ou égale à 0,05 % et inférieure à 0,4 %, de 10 à 15 % de Mn, 2 % ou moins d'Al, de 0,1 à 2 % de Si, 0,5 % ou moins de Mo (à l'exclusion de 0), 0,5 % ou moins de V (à l'exclusion de 0), 0,01 % ou moins de P, 0,01 % ou moins de S et le reste de Fe et d'autres impuretés inévitables et dont la microstructure comprend, en % en surface, 50 à 75 % de martensite revenue, 20 % ou moins de martensite secondaire (à l'exclusion de 0), 2 % ou moins d'ε-martensite (à l'exclusion de 0) et de 8 à 30 % d'austénite résiduelle ; et un procédé de fabrication associé. Selon un aspect de la présente invention, l'invention concerne une tôle d'acier laminée à chaud dont la résistance à la traction est supérieure ou égale à 1 500 MPa, dont la limite d'élasticité est supérieure ou égale à 900 MPa et dont l'allongement est supérieur ou égal à 20 % et un procédé de fabrication associé.
(KO) 본 발명의 일측면은 망간 편석을 활용함으로써 우수한 강도와 연신율을 갖는 열연강판 및 제조방법을 제공하고자 하는 것이다. 본 발명의 일 실시형태는 중량%로, C: 0.05%이상~0.4%미만, Mn: 10~15%, Al: 2%이하, Si: 0.1~2%, Mo: 0.5%이하(0은 제외), V: 0.5%이하(0은 제외), P: 0.01%이하, S: 0.01%이하 및 잔부 Fe 및 기타 불가피한 불순물을 포함하고, 미세조직이 면적%로, 템퍼드 마르텐사이트: 50~75%, 세컨더리(Secondary) 마르텐사이트: 20%이하(0은 제외), 입실론 마르텐사이트: 2%이하(0은 제외) 및 잔류 오스테나이트: 8~30%를 포함하는 우수한 강도와 연신율을 갖는 열연강판 및 그 제조방법을 제공한다. 본 발명의 일측면에 따르면, 1500MPa 이상의 인장강도, 900MPa 이상의 항복강도 및 20%이상의 연신율을 갖는 열연강판 및 제조방법을 제공할 수 있다.
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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 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)