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1. (WO2016104837) HOT-ROLLED STEEL SHEET FOR HIGH STRENGTH GALVANIZED STEEL SHEET, HAVING EXCELLENT SURFACE QUALITY, AND METHOD FOR PRODUCING SAME
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2016/104837    International Application No.:    PCT/KR2014/012848
Publication Date: 30.06.2016 International Filing Date: 24.12.2014
IPC:
C22C 38/02 (2006.01), C22C 38/04 (2006.01), C21D 8/02 (2006.01), C23C 2/06 (2006.01)
Applicants: POSCO [KR/KR]; (Goedong-dong) 6261, Donghaean-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do 790-300 (KR)
Inventors: KIM, Young-Ha; (KR).
KWAK, Hyo Jung; (KR).
SEO, Seok Jong; (KR)
Agent: DANA PATENT LAW FIRM; 5th Floor, New Wing, Gwangsung Bldg., 11, Yeoksam-ro 3-gil, Gangnam-gu, Seoul 135-936 (KR)
Priority Data:
10-2014-0185995 22.12.2014 KR
Title (EN) HOT-ROLLED STEEL SHEET FOR HIGH STRENGTH GALVANIZED STEEL SHEET, HAVING EXCELLENT SURFACE QUALITY, AND METHOD FOR PRODUCING SAME
(FR) TÔLE D'ACIER LAMINÉE À CHAUD POUR TÔLE D'ACIER GALVANISÉE À HAUTE RÉSISTANCE, AYANT UNE EXCELLENTE QUALITÉ DE SURFACE, ET SON PROCÉDÉ DE PRODUCTION
(KO) 표면품질이 우수한 고강도 아연도금강판용 열연강판 및 이의 제조방법
Abstract: front page image
(EN)The present invention relates to a hot-rolled steel sheet for a high strength galvanized steel sheet, having excellent surface quality, and a method for producing the same, the hot-rolled steel sheet comprising, by weight%: C: 0.08 to 0.2%, Si: 0.03 to 0.15%, Mn: 1.4 to 2%, P: 0.001 to 0.05%, S: 0.001 to 0.03%, Al: 0.002 to 0.05%, and the remainder being Fe and unavoidable impurities. The weight ratio of Mn/Si is 20 to 30, the weight ratio of C/Si is 1 to 5, and the weight ratio of Si/P is 3 to 10. The hot-rolled steel sheet has a microstructure consisting of, in area fraction, 10 to 40% of bainite, 20 to 30% of pearlite and 40 to 60% of ferrite, and includes a ternary eutectic compound of FeO, Fe2SiO4 and Fe3(PO)4 formed within 50 µm from the surface.
(FR)La présente invention se rapporte à une tôle d'acier laminée à chaud pour une tôle d'acier galvanisée à haute résistance, ayant une excellente qualité de surface, et à son procédé de production, la tôle d'acier laminée à chaud comprenant, en % en poids : 0,08 à 0,2 % de C, 0,03 à 0,15 % de Si, 1,4 à 2 % de Mn, 0,001 à 0,05 % de P, 0,001 à 0,03 % de S et 0,002 à 0,05 % d'Al, le reste étant du Fe et des impuretés inévitables. Le rapport pondéral Mn/Si est de 20 à 30, le rapport pondéral C/Si est de 1 à 5 et le rapport pondéral Si/P est de 3 à 10. La tôle d'acier laminée à chaud a une microstructure constituée, en termes de fraction surfacique, de 10 à 40 % de bainite, 20 à 30 % de perlite et 40 à 60 % de ferrite et comprend un composé eutectique ternaire de FeO, Fe2SiO4 et Fe3(PO)4 formé à moins de 50 µm de la surface.
(KO)본 발명은 표면품질이 우수한 고강도 아연도금강판용 열연강판 및 이의 제조방법에 관한 것으로, 중량%로, C: 0.08~0.2%, Si: 0.03~0.15%, Mn: 1.4~2%, P: 0.001~0.05%, S: 0.001~0.03%, Al: 0.002~0.05%, 잔부 Fe 및 기타 불가피한 불순물을 포함하고, Mn/Si의 중량비가 20~30이고, C/Si의 중량비가 1~5이고, Si/P의 중량비가 3~10이며, 미세조직이 면적분율로 10~40%의 베이나이트, 20~30%의 펄라이트 및 40~60%의 페라이트로 이루어지며, 표면으로부터 50 ㎛ 이내에 FeO, Fe2SiO4, Fe3(PO)4의 삼원 공정(ternary eutectic) 화합물이 형성되어 있는 것을 특징으로 하는 표면품질이 우수한 고강도 열연강판 및 그 제조방법을 제공한다.
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)