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1. (WO2019031583) HOT ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Latest bibliographic data on file with the International BureauSubmit observation

Pub. No.: WO/2019/031583 International Application No.: PCT/JP2018/029920
Publication Date: 14.02.2019 International Filing Date: 09.08.2018
IPC:
C22C 38/00 (2006.01) ,C21D 9/46 (2006.01) ,C22C 38/14 (2006.01) ,C22C 38/16 (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
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
16
containing copper
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:
日本製鉄株式会社 NIPPON STEEL 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:
平島 哲矢 HIRASHIMA Tetsuya; JP
豊田 武 TOYODA Takeshi; 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:
2017-15429409.08.2017JP
Title (EN) HOT ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
(FR) TÔLE D'ACIER LAMINÉE À CHAUD ET SON PROCÉDÉ DE FABRICATION
(JA) 熱延鋼板およびその製造方法
Abstract:
(EN) A hot rolled steel sheet according to an embodiment of the present invention is configured such that: the hot rolled steel sheet has prescribed chemical components; the metal structure in a center position in the sheet width at 1/4 the depth of sheet thickness is formed of 90% by volume or greater martensite with the remaining structure being 0 – 10% by volume; the remaining structure is either one or both of bainite or ferrite; the average length of crystal grains in direction L is 0.2 – 5.0 µm, the average length of crystal grains in direction C is 0.1 – 5.0 µm, and the ratio of C direction grain lengths, which are the average lengths for the crystal grains in the direction C, to the L direction grain lengths, which are the average length for crystal grains in the direction L, is 0.2 ≤ C direction grain lengths/L direction grain lengths ≤ 5.0; and tensile strength is 1180 MPa or greater.
(FR) La présente invention concerne, selon un mode de réalisation, une tôle d'acier laminée à chaud configurée de telle sorte que : la tôle d'acier laminée à chaud a des composants chimiques prescrits ; la structure métallique à une position centrale dans la largeur de tôle à 1/4 la profondeur d'épaisseur de tôle est formée de 90 % en volume ou plus à partir de martensite, la structure restante étant de 0 à 10 % en volume ; la structure restante est l'une quelconque d'une bainite ou d'une ferrite ; la longueur moyenne des grains cristallins dans la direction L est de 0,2 à 5,0 µm, la longueur moyenne des grains cristallins dans la direction C est de 0,1 à 5,0 µm, et le rapport des longueurs de grain dans la direction C, qui sont les longueurs moyennes pour les grains cristallins dans la direction C par rapport aux longueurs de grain dans la direction L, qui sont la longueur moyenne des grains cristallins dans la direction L, est de 0,2 ≤ longueur de grain de direction C/ longueur de grain de direction L ≤ 5,0 ; et la résistance à la traction est de 1180 MPa ou plus.
(JA) 本発明の一態様に係る熱延鋼板は、所定の化学成分を有し、板厚1/4深さの位置かつ板幅中央位置における金属組織が、90体積%以上のマルテンサイトと、0体積%以上10体積%以下の残部組織とからなり、前記残部組織がベイナイトまたはフェライトの一方または両方であり、L方向の結晶粒の平均長さが0.2μm以上5.0μm以下であり、C方向の結晶粒の平均長さが0.1μm以上5.0μm以下であり、且つ、前記L方向の結晶粒の平均長さであるL方向粒長と前記C方向の結晶粒の平均長さであるC方向粒長との比が0.2≦C方向粒長/L方向粒長≦5.0であり、引張強度が1180MPa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 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: Japanese (JA)
Filing Language: Japanese (JA)