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1. (WO2015118863) HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREFOR
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2015/118863 International Application No.: PCT/JP2015/000498
Publication Date: 13.08.2015 International Filing Date: 04.02.2015
IPC:
C22C 38/00 (2006.01) ,C21D 9/46 (2006.01) ,C22C 38/14 (2006.01) ,C22C 38/60 (2006.01) ,C23C 2/06 (2006.01) ,C23C 2/12 (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
60
containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
C CHEMISTRY; METALLURGY
23
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
C
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
2
Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
04
characterised by the coating material
06
Zinc or cadmium or alloys based thereon
C CHEMISTRY; METALLURGY
23
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
C
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
2
Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
04
characterised by the coating material
12
Aluminium or alloys based thereon
Applicants: JFE STEEL CORPORATION[JP/JP]; 2-3, Uchisaiwai-cho 2-chome, Chiyoda-ku, Tokyo 1000011, JP
Inventors: TANAKA, Takaaki; JP
KIZU, Taro; JP
KAMI, Chikara; JP
Agent: KUMASAKA, Akira; JP
Priority Data:
2014-02053505.02.2014JP
Title (EN) HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREFOR
(FR) FEUILLE D'ACIER LAMINÉE À CHAUD HAUTE RÉSISTANCE ET SON PROCÉDÉ DE PRODUCTION
(JA) 高強度熱延鋼板およびその製造方法
Abstract:
(EN) The present invention provides: a high-strength hot-rolled steel sheet having excellent stretch-flangeability and fatigue properties; and a production method therefor. The high-strength hot-rolled steel sheet has a tensile strength of at least 590 MPa and excellent stretch-flangeability and fatigue properties, as a result of having: a composition containing, in percent by mass, more than 0.020% but no more than 0.060% C, no more than 0.40% Si, more than 0.50% but no more than 1.20% Mn, no more than 0.030% P, no more than 0.030% S, no more than 0.10% Al, no more than 0.0100% N, and 0.050%-0.110% Ti, with the remainder being Fe and unavoidable impurities; a structure whereby the ferrite phase area ratio thereof is at least 95%, the solid solution C amount in the steel is at least 0.010%, a carbide that includes Ti is finely precipitated inside the crystal particles of the ferrite phase, and the average particle diameter of the carbide is less than 8 nm; and an internal oxidation in the steel sheet surface layer of no more than 0.15 g/m2.
(FR) L'invention concerne : une feuille d'acier laminée à chaud haute résistance ayant d'excellentes capacité à former des bords par étirage et propriété de fatigue ; et un procédé de production associé. La feuille d'acier laminée à chaud haute résistance a une résistance à la traction d'au moins 590 MPa et d'excellentes capacité à former des bords par étirage et propriétés de fatigue, qui résultent du fait qu'elle possède : une composition contenant, en pour cent en masse, plus de 0,020 % mais pas plus de 0,060 % de C, pas plus de 0,40 % de Si, plus de 0,50 % mais pas plus de 1,20 % de Mn, pas plus de 0,030 % de P, pas plus de 0,030 % de S, pas plus de 0,10 % d'Al, pas plus de 0,0100% de N et 0,050 % à 0,110 % de Ti, le reste étant du Fe et des impuretés inévitables ; une structure moyennant laquelle son rapport de surface de phase de ferrite est d'au moins 95 %, la quantité de C en solution solide dans l'acier est d'au moins 0,010 %, un carbure qui comprend Ti est finement précipité à l'intérieur des particules cristallines de la phase de ferrite et le diamètre de particule moyen du carbure est inférieur à 8 nm ; et une oxydation interne dans la couche de surface de tôle d'acier de pas plus de 0,15 g/m2.
(JA) 本発明は、伸びフランジ性および疲労特性に優れた高強度熱延鋼板およびその製造方法を提供するものであり、質量%で、C:0.020%超0.060%以下、Si:0.40%以下、Mn:0.50%超1.20%以下、P:0.030%以下、S:0.030%以下、Al:0.10%以下、N:0.0100%以下、Ti:0.050%以上0.110%以下を含有し、残部がFe および不可避的不純物からなる組成とし、フェライト相の面積率が95%以上であり、鋼中の固溶C 量が0.010%以上であり、前記フェライト相の結晶粒内にTi を含む炭化物が微細析出し、該炭化物の平均粒子径が8nm 未満である組織とし、更に、鋼板表層部の内部酸化量を0.15g/m2 以下とすることで、引張強さが590MPa 以上であり、伸びフランジ性且つ疲労特性に優れた高強度熱延鋼板とする。
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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)