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1. (WO2018179386) COLD-ROLLED STEEL SHEET AND HOT-DIP GALVANIZED COLD-ROLLED STEEL SHEET
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Pub. No.: WO/2018/179386 International Application No.: PCT/JP2017/013736
Publication Date: 04.10.2018 International Filing Date: 31.03.2017
IPC:
C22C 38/00 (2006.01) ,C23C 2/06 (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
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
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:
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:
横山 卓史 YOKOYAMA, Takafumi; JP
岡本 力 OKAMOTO, Riki; JP
山口 裕司 YAMAGUCHI, Yuji; JP
塩川 一生 SHIOKAWA, Kazuki; JP
中平 優一 NAKAHIRA, Yuichi; JP
川田 裕之 KAWATA, Hiroyuki; 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) COLD-ROLLED STEEL SHEET AND HOT-DIP GALVANIZED COLD-ROLLED STEEL SHEET
(FR) TÔLE D'ACIER LAMINÉE À FROID ET TÔLE D'ACIER LAMINÉE À FROID GALVANISÉE PAR IMMERSION À CHAUD
(JA) 冷間圧延鋼板および溶融亜鉛めっき冷間圧延鋼板
Abstract:
(EN) A cold-rolled steel sheet with a tensile strength of at least 980 MPa has a prescribed chemical composition. The microstructure, in area%, is ferrite: 1-29%, retained austenite: 5-20%, martensite: less than 10%, pearlite: less than 5%, and balance: bainite and/or tempered martensite. The total length of interfaces, where ferrite is in contact with martensite or with retained austenite having an equivalent circular radius of at least 1 µm, is 100 µm or less per 1000 µm2. Said cold-rolled steel sheet has excellent workability and low-temperature toughness, especially low-temperature toughness after introducing plastic deformation.
(FR) L'invention concerne une tôle d'acier laminée à froid présentant une résistance à la traction au moins égale à 980 MPa et une composition chimique prédéterminée. La microstructure est composée, en % en surface, de ferrite : 1 à 29 %, d'austénite résiduelle : 5 à 20 %, de martensite : moins de 10 %, de perlite : moins de 5 %, le reste étant constitué : de bainite et/ou de martensite revenue. La longueur totale des interfaces, à l'endroit où la ferrite est en contact avec la martensite ou l'austénite résiduelle présentant un rayon circulaire équivalent égal à au moins 1 µm, est égale ou inférieure à 100 µm par 1 000 µm2. Ladite tôle d'acier laminée à froid présente une excellente aptitude au façonnage et une excellente ténacité à basse température, en particulier une excellente ténacité à basse température après l'introduction d'une déformation plastique.
(JA) 引張強さが980MPa以上である冷間圧延鋼板であって、所定の化学組成を有し、ミクロ組織が、面積%で、フェライト:1~29%、残留オーステナイト:5~20%、マルテンサイト:10%未満、パーライト:5%未満、残部:ベイナイトおよび/または焼戻しマルテンサイトであり、フェライトと、円相当半径1μm以上のマルテンサイトまたは残留オーステナイトとが接する界面の長さの総和が、1000μm2当たり100μm以下である、冷間圧延鋼板。この冷間圧延鋼板は、加工性と低温靭性に優れ、とりわけ塑性ひずみ導入後の低温靭性に優れている。
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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, 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 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)