Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO2012002520) ULTRAHIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH EXCELLENT DUCTILITY AND DELAYED-FRACTURE RESISTANCE, AND PROCESS FOR PRODUCING SAME
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2012/002520 International Application No.: PCT/JP2011/065135
Publication Date: 05.01.2012 International Filing Date: 24.06.2011
IPC:
C22C 38/00 (2006.01) ,B21B 3/00 (2006.01) ,C21D 9/46 (2006.01) ,C22C 38/06 (2006.01) ,C22C 38/14 (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
B PERFORMING OPERATIONS; TRANSPORTING
21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B
ROLLING OF METAL
3
Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences
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
06
containing aluminium
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
Applicants:
JFEスチール株式会社 JFE STEEL CORPORATION [JP/JP]; 東京都千代田区内幸町二丁目2番3号 2-3, Uchisaiwai-cho 2-chome, Chiyoda-ku, Tokyo 1000011, JP (AllExceptUS)
吉野 正崇 YOSHINO, Masataka [JP/JP]; JP (UsOnly)
長谷川 浩平 HASEGAWA, Kohei [JP/JP]; JP (UsOnly)
Inventors:
吉野 正崇 YOSHINO, Masataka; JP
長谷川 浩平 HASEGAWA, Kohei; JP
Agent:
落合 憲一郎 OCHIAI, Kenichiro; 東京都中央区日本橋 二丁目1番10号 柳屋ビルディング7階JFEテクノリサーチ株式会社特許出願部内 c/o Patent Application Department, JFE TECHNO-RESEARCH CORPORATION, 7th Floor, Yanagiya Building, 1-10, Nihonbashi 2-chome, Chuo-ku, Tokyo 1030027, JP
Priority Data:
2010-14853130.06.2010JP
Title (EN) ULTRAHIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH EXCELLENT DUCTILITY AND DELAYED-FRACTURE RESISTANCE, AND PROCESS FOR PRODUCING SAME
(FR) TÔLE D'ACIER LAMINÉE À FROID À ULTRAHAUTE RÉSISTANCE PRÉSENTANT UNE EXCELLENTE DUCTILITÉ ET RÉSISTANCE À LA RUPTURE DIFFÉRÉE, ET SON PROCÉDÉ DE PRODUCTION
(JA) 延性及び耐遅れ破壊特性に優れる超高強度冷延鋼板およびその製造方法
Abstract:
(EN) Provided is an ultrahigh-strength cold-rolled steel sheet that has a steel composition in which neither transition metal elements which considerably raise the alloy cost, such as V and Mo, nor Al, which may induce casting defects, is contained in excess and that, despite the composition, has excellent delayed-fracture resistance and a tensile strength of 1,320 MPa or higher. Also provided is a process for producing the steel sheet. The steel sheet having excellent ductility and delayed-fracture resistance is characterized by containing, in terms of mass%, 0.15-0.25% C, 1.0-3.0% Si, 1.5-2.5% Mn, up to 0.05% P, up to 0.02% S, 0.01-0.05% Al, and below 0.005% N, with the remainder comprising Fe and incidental impurities. The steel sheet is further characterized by having a metallographic structure which comprises 40-85 vol.% tempered martensite phase and 15-60 vol.% ferrite phase and by having a tensile strength of 1,320 MPa or higher.
(FR) L'invention concerne une tôle d'acier laminée à froid à ultrahaute résistance dont la composition ne contient aucun excès de métal de transition qui augmenterait considérablement le coût de l'alliage comme V et Mo, ni d'aluminium qui peut induire des défauts de coulée, et qui, malgré cette composition, présente une excellente résistance à la rupture différée et une résistance à la traction d'au moins 1320 MPa. L'invention concerne également un procédé de production de ladite tôle d'acier. Ladite tôle d'acier, qui présente une excellente ductilité et résistance à la rupture différée contient, en pourcentage massique, 0,15-0,25 % de C, 1,0-3,0 % de Si, 1,5-2,5 % de Mn, jusqu'à 0,05 % de P, jusqu'à 0,02 % de S, 0,01-0,05 % d'Al et moins de 0,005 % de N, le solde étant du fer et les inévitables impuretés. La tôle d'acier présente une structure métallographique qui comprend 40-85 % en volume de phase martensitique revenue et 15-60 % en volume de phase ferritique, et possède une résistance à la traction d'au moins 1320 MPa.
(JA) VやMo等の合金コストを著しく上昇させる遷移金属元素ならびに鋳造欠陥を誘引する可能性があるAlを過剰に含まない鋼成分でありながら、耐遅れ破壊特性に優れ、1320MPa以上の引張強度を有する超高強度冷延鋼板とその製造方法を提供する。質量比で、C:0.15~0.25%、Si:1.0~3.0%、Mn:1.5~2.5%、P:0.05%以下、S:0.02%以下、Al:0.01~0.05%、N:0.005%未満を含み、残部がFeおよび不可避的不純物からなり、金属組織が体積率で40~85%の焼戻しマルテンサイト相、および体積率で15~60%のフェライト相を含み、引張強度が1320MPa以上であることを特徴とする延性及び耐遅れ破壊特性に優れる超高強度冷延鋼板。
front page image
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, 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, IS, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, 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, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, 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, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
US20130087257CN102971442EP2589674KR1020130037208TH131561IN3623/KOLNP/2012