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1. (WO2019009410) HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Latest bibliographic data on file with the International Bureau    Submit observation

Pub. No.: WO/2019/009410 International Application No.: PCT/JP2018/025687
Publication Date: 10.01.2019 International Filing Date: 06.07.2018
IPC:
C22C 38/00 (2006.01) ,C21D 8/02 (2006.01) ,C21D 9/46 (2006.01) ,C22C 38/14 (2006.01) ,C22C 38/58 (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
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
14
containing titanium or zirconium
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
58
with more than 1.5% by weight of manganese
Applicants:
新日鐵住金株式会社 NIPPON STEEL & SUMITOMO METAL CORPORATION [JP/JP]; 東京都千代田区丸の内二丁目6番1号 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071, JP
Inventors:
吉田 充 YOSHIDA Mitsuru; JP
小嶋 啓達 KOJIMA Nobusato; JP
神澤 佑樹 KANZAWA Yuuki; JP
神谷 公平 KAMIYA Kohhei; JP
Agent:
棚井 澄雄 TANAI Sumio; JP
寺本 光生 TERAMOTO Mitsuo; JP
勝俣 智夫 KATSUMATA Tomoo; JP
山口 洋 YAMAGUCHI Yoh; JP
Priority Data:
2017-13388907.07.2017JP
Title (EN) HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
(FR) TÔLE D'ACIER LAMINÉE À CHAUD ET SON PROCÉDÉ DE FABRICATION
(JA) 熱延鋼板及びその製造方法
Abstract:
(EN) The hot-rolled steel sheet according to one embodiment of the present invention is configured such that: the steel sheet has a prescribed chemical composition; at a depth position 1/4 of the sheet thickness from the surface, the area ratio of ferrite is 10–55%; the total area ratio of bainite and martensite is 45–90%; the total area ratio of the ferrite, the bainite and the martensite is at least 90%; and the average crystal grain diameter is 12.0 µm or less. In the texture measured at a section that is central in the sheet thickness direction, the maximum pole density in the {100} <011>, {211} <011>, {311} <011>, {110} <011>, and {332} <113> orientation groups is 8.0 or less and the total pole density of {211} <011> and {332} <113> is 10.0 or less, and the tensile strength is at least 950 MPa.
(FR) La tôle d'acier laminée à chaud selon un mode de réalisation de la présente invention est configurée de telle sorte que : la tôle d'acier a une composition chimique prescrite ; à une position de profondeur de 1/4 de l'épaisseur de tôle à partir de la surface, le rapport surfacique de ferrite est de 10 à 55 % ; le rapport surfacique total de bainite et de martensite est de 45 à 90 % ; le rapport surfacique total de la ferrite, de la bainite et de la martensite est d'au moins 90 % ; et le diamètre moyen des grains cristallins est inférieur ou égal à 12,0 µm. Dans la texture mesurée au niveau d'une section qui est centrale dans le sens de l'épaisseur de tôle, la densité de pôle maximale dans les groupes d'orientation {100} <011>, {211} <011>, {311} <011>, {110} <011> et {332} <113> est inférieure ou égale à 8,0 et la densité de pôle totale de {211} <011> et {332} <113> est inférieure ou égale à 10,0, et la résistance à la traction est d'au moins 950 MPa.
(JA) 本発明の一態様に係る熱延鋼板は、所定の化学組成を有し、表面から板厚1/4深さ位置において、フェライトの面積率が10~55%であり、ベイナイト及びマルテンサイトの合計面積率が45~90%であり、前記フェライト、前記ベイナイト及び前記マルテンサイトの合計面積率が90%以上であり、平均結晶粒径が12.0μm以下であり、板厚中心部にて測定した集合組織において、{100}<011>、{211}<011>、{311}<011>、{110}<011>及び{332}<113>方位群の最大極密度が8.0以下、かつ、{211}<011>と{332}<113>の極密度の合計が10.0以下であり、引張強度が950MPa以上である。
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, KR, 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 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)