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1. (WO2017022025) HIGH-STRENGTH HOT-ROLLED STEEL SHEET
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2017/022025 International Application No.: PCT/JP2015/071845
Publication Date: 09.02.2017 International Filing Date: 31.07.2015
IPC:
C22C 38/00 (2006.01) ,C21D 9/46 (2006.01) ,C22C 38/54 (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
9
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor
46
for sheet metals
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
40
with nickel
54
with boron
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION[JP/JP]; 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071, JP
Inventors: SUGIURA Natsuko; JP
TANAKA Yasuaki; JP
YOKOYAMA Takafumi; JP
Agent: SHIGA Masatake; JP
Priority Data:
Title (EN) HIGH-STRENGTH HOT-ROLLED STEEL SHEET
(FR) TÔLE D'ACIER LAMINÉE À CHAUD À RÉSISTANCE ÉLEVÉE
(JA) 高強度熱延鋼板
Abstract:
(EN) This high-strength hot-rolled steel sheet has a prescribed chemical composition, said composition containing 80% or more of polygonal ferrite, no more than 5% of martensite and austenite in total, and no more than 5% of pearlite and cementite in total (percentages being expressed in terms of area), the remainder being one or more selected from bainitic ferrite and bainite. σHV, which is the standard deviation in microhardness of 50 arbitrary polygonal ferrite grains present in a range of ±100 μm from the center plane in the direction of sheet thickness, is no greater than 30. At least 5×107 Ti-containing carbides/mm2 are present in the polygonal ferrite grains. At least 50% of the Ti-containing carbides have an aspect ratio of less than 3, the aspect ratio being the ratio of the long-side length to the short-side length. The tensile strength is at least 540 MPa.
(FR) L'invention concerne une tôle d'acier laminée à chaud, à résistance élevée, qui possède une composition chimique prescrite, cette composition contenant au moins 80% de ferrite polygonale, pas plus de 5% de martensite et d'austénite au total, et pas plus de 5 % de perlite et de cémentite au total (ces pourcentages étant exprimés en termes de surface), le reste étant constitué d'au moins un élément choisi parmi la ferrite bainitique et la bainite. σHV, qui est l'écart type de microdureté de 50 grains de ferrite polygonaux arbitraires présents dans une plage de ± 100 µm, à partir du plan central dans la direction d'épaisseur de la tôle, n'est pas supérieur à 30. Au moins 5 × 10 7 carbures/mm2 contenant Ti sont présents dans les grains de ferrite polygonale. Au moins 50 % des carbures contenant Ti possèdent un rapport d'aspect inférieur à 3, le rapport d'aspect étant le rapport entre la longueur du côté long et la longueur du côté court. La résistance à la traction est d'au moins 540 MPa.
(JA) この高強度熱延鋼板は、所定の化学組成を有し、組織が、面積率で、80%以上のポリゴナルフェライトと、合計で5%以下のマルテンサイトおよびオーステナイトと、合計で5%以下のパーライトおよびセメンタイトとを含有し、残部がベイニティックフェライトおよびベイナイトから選択される一種以上であり、板厚方向において中心面から±100μmの範囲内に存在する任意の50個の前記ポリゴナルフェライトのマイクロ硬さの標準偏差をσHVとしたとき、前記σHVが30以下であり、前記ポリゴナルフェライトの粒内にTi含有炭化物が5×10個/mm以上存在し、前記Ti含有炭化物のうち50%以上が、短辺の長さに対する長辺の長さの比であるアスペクト比が3未満であり、引張強度が540MPa以上である。
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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, 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, KR, 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 Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (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: Japanese (JA)
Filing Language: Japanese (JA)