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1. (WO2010074463) HIGH CARBON STEEL SHEET WITH SUPERIOR HEAT TREATMENT CHARACTERISTICS, AND MANUFACTURING METHOD THEREOF
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2010/074463 International Application No.: PCT/KR2009/007625
Publication Date: 01.07.2010 International Filing Date: 21.12.2009
IPC:
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
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 괴동동 1번지 1, Goedong-dong, Nam-ku Pohang-shi, Kyungsangbuk-do 790-300, KR (AllExceptUS)
이창훈 LEE, Chang-Hoon [KR/KR]; KR (UsOnly)
전재춘 JEON, Jea-Chun [KR/KR]; KR (UsOnly)
이종섭 LEE, Jong-Sub [KR/KR]; KR (UsOnly)
김기수 KIM, Ki-Soo [KR/KR]; KR (UsOnly)
Inventors:
이창훈 LEE, Chang-Hoon; KR
전재춘 JEON, Jea-Chun; KR
이종섭 LEE, Jong-Sub; KR
김기수 KIM, Ki-Soo; KR
Agent:
유미특허법인 YOU ME PATENT AND LAW FIRM; 서울특별시 강남구 역삼동 649-10 서림빌딩 Seolim Bldg. 649-10, Yoksam-dong Kangnam-ku Seoul 135-080, KR
Priority Data:
10-2008-013335724.12.2008KR
Title (EN) HIGH CARBON STEEL SHEET WITH SUPERIOR HEAT TREATMENT CHARACTERISTICS, AND MANUFACTURING METHOD THEREOF
(FR) FEUILLE EN ACIER À TENEUR ÉLEVÉE EN CARBONE PRÉSENTANT DES CARACTÉRISTIQUES DE TRAITEMENT THERMIQUE SUPÉRIEURES, ET SON PROCÉDÉ DE FABRICATION
(KO) 열처리 특성이 우수한 고탄소 강판 및 그 제조방법
Abstract:
(EN) The present invention provides a method for manufacturing a high carbon steel sheet, comprising the steps of i) producing a high carbon slab having a chemical composition comprising, by wt%, C 0.3-1.0%, Mn:0.1-1.2%, Si: more than 0 but less than 0.4%, Al: 0.01-0.1%, S: more than 0 but not more than 0.01%, the remainder being Fe and inevitable impurities ii) reheating the slab to the temperature higher than the Ar3 transformation point, iii) rough-milling the slab, and milling the slab again in an austenite region having a temperature higher than the Ar3 transformation point to produce a steel sheet, iv) cooling the steel sheet on a run-out table by the cooling speed of 50°C/second to 300°C/second, v) finishing the steel sheet cooling process at a temperature of 400-650°C, and maintaining the temperature, vi) winding the steel sheet at a temperature of 450-700°C, vii) omitting a pre-annealing process, and cold-rolling the wound steel sheet by a reduction ratio of 30% or higher; and viii) spheroidizing the cold-rolled steel sheet.
(FR) La présente invention concerne un procédé de fabrication d'une feuille en acier à teneur élevée en carbone, comprenant les étapes consistant à i) produire une brame à teneur élevée en carbone, dont la composition chimique en % en poids est la suivante : C : 0,3 % à 1,0 %, Mn : 0,1 % à 1,2 %, Si : supérieur à 0 % et inférieur à 0,4 %, Al : 0,01 % à 0,1 %, S : supérieur à 0 % et inférieur à 0,01 %, le reste étant Fe et les impuretés inévitables, ii) chauffer à nouveau la brame jusqu'à une température supérieure au point de transformation Ar3, iii) dégrossir la brame à la fraiseuse et fraiser encore la brame dans une région austénitique ayant une température supérieure au point de transformation Ar3 pour produire une feuille en acier, iv) refroidir la feuille en acier sur une table de sortie à une vitesse de refroidissement située entre 50 °C/seconde et 300 °C/seconde, v) finir le processus de refroidissement de la feuille en acier à une température située entre 400 °C et 650 °C, et maintenir la température, vi) enrouler la feuille en acier à une température située entre 450 °C et 700 °C, vii) omettre un procédé de pré-recuit, et laminer à froid la feuille en acier enroulée à un rapport de réduction supérieur ou égal à 30 %; et viii) soumettre la feuille en acier laminée à froid à un traitement de sphéroïdisation.
(KO) 본 발명은 ⅰ) 중량%로 C:0.3~1.0%, Mn: 0.1~1.2%, Si:0보다 크고 0.4%이하, Al: 0.01~0.1%, S:0보다 크고 0.01%이하, 나머지 Fe 및 기타 불가피하게 첨가되는 불순물로 이루어진 고탄소 슬라브를 제조하는 단계, ⅱ) 상기 슬라브를 온도는 Ar3 변태점 이상으로 재가열하는 단계, ⅲ) 상기 슬라브를 조압연을 한 다음 온도는 Ar3 변태점 이상의 오스테나이트 영역에서 마무리 압연을 하여 박판을 제조하는 단계, ⅳ) 상기 박판을 수냉각대에서 냉각속도 50℃/초 이상 300℃/초 이하의 냉각속도로 냉각하는 단계, ⅴ) 상기 박판을 400~650℃의 온도구간에서 냉각을 종료하고 온도를 유지하는 단계, ⅵ) 상기 박판을 450~700℃의 온도구간에서 권취하는 단계, ⅶ) 상기 권취된 박판을 선 소둔을 생략하고 압하율 30% 이상으로 냉간압연하는 단계, 및 ⅷ) 상기 냉간압연한 박판을 구상화 소둔하는 단계; 를 포함하는 고탄소 강판의 제조방법을 제공한다.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, 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, IS, JP, KE, KG, KM, KN, KP, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, 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, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (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, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: Korean (KO)
Filing Language: Korean (KO)
Also published as:
US20110259483CN102264933IN5360/CHENP/2011