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1. (WO2018179387) HOT-ROLLED STEEL SHEET
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2018/179387 International Application No.: PCT/JP2017/013743
Publication Date: 04.10.2018 International Filing Date: 31.03.2017
IPC:
C22C 38/00 (2006.01) ,C22C 38/58 (2006.01) ,C21D 9/46 (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
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
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
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:
横井 龍雄 YOKOI, Tatsuo; JP
吉川 伸麻 YOSHIKAWA, Nobuo; JP
米村 繁 YONEMURA, Shigeru; JP
大塚 和也 OOTSUKA, Kazuya; JP
Agent:
特許業務法人ブライタス BRIGHTAS IP ATTORNEYS; 大阪府大阪市北区曽根崎2丁目5番10号 2-5-10, Sonezaki, Kita-ku, Osaka-shi, Osaka 5300057, JP
Priority Data:
Title (EN) HOT-ROLLED STEEL SHEET
(FR) TÔLE D'ACIER LAMINÉE À CHAUD
(JA) 熱間圧延鋼板
Abstract:
(EN) A hot-rolled steel sheet, wherein: the chemical composition, in mass%, is C: 0.07-0.22%, Si: 1.00-3.20%, Mn:0.80-2.20%, Al: 0.010-1.000%, N≤0.0060%, P≤0.050%, S≤0.005%, Ti: 0-0.150%, Nb: 0-0.100%, V: 0-0.300%, Cu: 0-2.00%, Ni: 0-2.00%, Cr: 0-2.00%, Mo: 0-1.00%, B: 0-0.0100%, Mg: 0-0.0100%, Ca: 0-0.0100%, REM: 0-0.1000%, Zr: 0-1.000%, Co: 0-1.000%, Zn: 0-1.000%, W: 0-1.000%, Sn: 0-0.050%, balance: Fe and impurities; the metal structure located at 1/4W or 3/4W from the edge face of the steel sheet and 1/4t or 3/4t from the surface is, in area%, retained austenite: greater than 2% to 10%, martensite≤2%, bainite: 10-70%, pearlite≤2%, balance: ferrite; the mean equivalent circular diameter of the metal phases made of retained austenite/martensite is 1.0-5.0 µm; the mean value for the shortest distance between adjacent metal phases is at least 3 µm; and the standard deviation for nano-hardness is 2.5 GPa or less.
(FR) La présente invention concerne une tôle d'acier laminée à chaud, dans laquelle : la composition chimique, en % en masse, est C : 0,07-0,22 %, Si : 1,00-3,20 %, Mn : 0,80-2,20 %, Al : 0,010-1,000 %, N ≤ 0,0060 %, P ≤ 0,050 %, S ≤ 0,005 %, Ti : 0-0,150 %, Nb : 0-0,100 %, V: 0-0,300 %, Cu : 0-2,00 %, Ni : 0-2,00 %, Cr : 0-2,00 %, Mo : 0-1,00 %, B : 0-0,0100 %, Mg : 0-0,0100 %, Ca : 0-0,0100 %, REM : 0-0,1000 %, Zr : 0-1,000 %, Co : 0-1,000 %, Zn : 0-1,000 %, W : 0-1,000 %, Sn : 0-0,050 %, le reste étant : Fe et des impuretés; la structure métallique située à 1/4W ou 3/4W de la face de bord de la tôle d'acier et 1/4t ou 3/4t de la surface est, en % en surface, austénite résiduelle : plus de 2 % à 10 %, martensite ≤ 2 %, bainite : de 10 à 70 %, perlite ≤ 2 %, le complément étant : de la ferrite; le diamètre circulaire équivalent moyen des phases métalliques constituées d'austénite/martensite retenue est de 1,0 à 5,0 µm; la valeur moyenne pour la distance la plus courte entre des phases métalliques adjacentes est d'au moins 3 µm; et l'écart type pour la nanodureté est de 2,5 GPa ou moins.
(JA) 化学組成が、質量%で、C:0.07-0.22%、Si:1.00-3.20%、Mn:0.80-2.20%、Al:0.010-1.000%、N≦0.0060%、P≦0.050%、S≦0.005%、Ti:0-0.150%、Nb:0-0.100%、V:0-0.300%、Cu:0-2.00%、Ni:0-2.00%、Cr:0-2.00%、Mo:0-1.00%、B:0-0.0100%、Mg:0-0.0100%、Ca:0-0.0100%、REM:0-0.1000%、Zr:0-1.000%、Co:0-1.000%、Zn:0-1.000%、W:0-1.000%、Sn:0-0.050%、残部:Feおよび不純物であり、鋼板の端面から1/4Wまたは3/4Wで、表面から1/4tまたは3/4tの位置における金属組織が、面積%で、残留オーステナイト:2%超-10%、マルテンサイト≦2%、ベイナイト:10-70%、パーライト≦2%、残部:フェライトであり、残留オーステナイト/マルテンサイトからなる金属相の平均円相当径が1.0-5.0μmであり、隣接する前記金属相の最短距離の平均値が3μm以上であり、ナノ硬度の標準偏差が2.5GPa以下である、熱間圧延鋼板。
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, 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)