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1. (WO2016105094) SUPER DUPLEX STAINLESS STEEL HAVING EXCELLENT YIELD STRENGTH AND IMPACT TOUGHNESS AND MANUFACTURING METHOD THEREFOR
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2016/105094    International Application No.:    PCT/KR2015/014114
Publication Date: 30.06.2016 International Filing Date: 22.12.2015
IPC:
C22C 38/44 (2006.01), C22C 38/18 (2006.01), C21D 8/02 (2006.01), C21D 1/26 (2006.01)
Applicants: POSCO [KR/KR]; (Geodong-dong) 6261 Donghaean-ro, Nam-gu Pohang-si Gyeongsangbuk-do 37859 (KR)
Inventors: JEON, Jong Jin; (KR).
SHIN, Dong Ik; (KR)
Agent: SHINSEGI PATENT LAW FIRM; 25, Seolleung-ro 119-gil Gangnam-gu Seoul 06100 (KR)
Priority Data:
10-2014-0191169 26.12.2014 KR
Title (EN) SUPER DUPLEX STAINLESS STEEL HAVING EXCELLENT YIELD STRENGTH AND IMPACT TOUGHNESS AND MANUFACTURING METHOD THEREFOR
(FR) ACIER INOXYDABLE SUPER DUPLEX PRÉSENTANT UNE EXCELLENTE LIMITE D'ÉLASTICITÉ ET RÉSISTANCE AUX CHOCS ET SON PROCÉDÉ DE FABRICATION
(KO) 항복강도 및 충격인성이 우수한 슈퍼 듀플렉스 스테인리스강 및 그 제조방법
Abstract: front page image
(EN)The present invention relates to a super duplex stainless steel having excellent yield strength and impact toughness, wherein the reduction ratio and the heat treatment temperature are controlled so as to improve mechanical properties. The super duplex stainless steel having excellent yield strength and impact toughness, according to one embodiment of the present invention, is a thick super duplex stainless steel having a thickness of 300 mm or more, the steel comprising 24-26 wt% of Cr, 6.0-8.0 wt% of Ni, 3.5-5.0 wt% of Mo, and 0.24-0.32 wt% of N, and containing the remainder being Fe and inevitable impurities, and a microstructure comprises a ferrite phase, an austenite phase and a secondary austenite phase, wherein the grain size thereof is 25 µm or less.
(FR)La présente invention concerne un acier inoxydable super duplex présentant une excellente limite d'élasticité et résistance aux chocs, où le rapport de réduction et la température du traitement thermique sont contrôlés de façon à améliorer les propriétés mécaniques. Selon un mode de réalisation de l'invention, ledit acier inoxydable super duplex présentant une excellente limite d'élasticité et résistance aux chocs est un acier inoxydable super duplex épais présentant une épaisseur supérieure ou égale à 300 mm, l'acier comprenant de 24 à 26 % en poids de Cr, de 6,0 à 8,0 % en poids de Ni, de 3,5 à 5,0 % en poids de Mo, et de 0,24 à 0,32 % en poids de N, le reste étant du Fe et les inévitables impuretés, et une microstructure comprend une phase ferritique, une phase austénitique et une phase austénitique secondaire, et dont la taille de grain est inférieure ou égale à 25 µm.
(KO)본 발명은 압하율 및 열처리 온도를 조절하여 기계적 특성을 향상시킨 항복강도 및 충격인성이 우수한 슈퍼 듀플렉스 스테인리스강에 관한 것으로서, 본 발명의 일 실시예에 따른, 항복강도 및 충격인성이 우수한 슈퍼 듀플렉스 스테인리스강은 30㎜ 이상의 두께를 갖는 후물 슈퍼 듀플렉스 스테인리스강에 관한 것으로서, 중량%로, Cr: 24 ~ 26%, Ni: 6.0 ~ 8.0%, Mo: 3.5 ~ 5.0%, N: 0.24 ~ 0.32% 를 포함하고, 나머지 Fe 및 불가피한 불순물을 포함하며, 미세조직이 페라이트상, 오스테나이트상 및 2차 오스테나이트상으로 구성되되, 결정립 크기가 25㎛ 이하인 것을 특징으로 한다.
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, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, 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 (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)