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1. (WO2009061006) STEEL PLATE FOR LINE PIPES AND STEEL PIPES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2009/061006    International Application No.:    PCT/JP2008/070726
Publication Date: 14.05.2009 International Filing Date: 07.11.2008
IPC:
C22C 38/00 (2006.01), C22C 38/14 (2006.01), C22C 38/58 (2006.01), C21D 8/02 (2006.01)
Applicants: JFE STEEL CORPORATION [JP/JP]; 2-3, Uchisaiwai-cho 2-chome, Chiyoda-ku, Tokyo 1000011 (JP) (For All Designated States Except US).
ISHIKAWA, Nobuyuki [JP/JP]; (JP) (For US Only).
SUZUKI, Makoto [JP/JP]; (JP) (For US Only).
MATSUSHIMA, Tomohiro [JP/JP]; (JP) (For US Only).
TSUJI, Akiyoshi [JP/JP]; (JP) (For US Only).
KAKIHARA, Shinichi [JP/JP]; (JP) (For US Only).
SHIKANAI, Nobuo [JP/JP]; (JP) (For US Only).
AWAJIYA, Hiroshi [JP/JP]; (JP) (For US Only)
Inventors: ISHIKAWA, Nobuyuki; (JP).
SUZUKI, Makoto; (JP).
MATSUSHIMA, Tomohiro; (JP).
TSUJI, Akiyoshi; (JP).
KAKIHARA, Shinichi; (JP).
SHIKANAI, Nobuo; (JP).
AWAJIYA, Hiroshi; (JP)
Agent: OCHIAI, Kenichiro; c/o Patent Application Dept. JFE TECHNO-RESEARCH CORPORATION, 7th floor Yanagiya building., 1-10 Nihonbashi 2-chome, Chuo-ku Tokyo 1030027 (JP)
Priority Data:
2007-290220 07.11.2007 JP
Title (EN) STEEL PLATE FOR LINE PIPES AND STEEL PIPES
(FR) PLAQUES D'ACIER POUR PIPELINES ET TUBES D'ACIER
(JA) ラインパイプ用鋼板及び鋼管
Abstract: front page image
(EN)The invention provides a steel for high-strength sour-resistant line pipes which has such excellent HIC resistance as to match with severe HIC resistance performance requisite to sour -resistant line pipes having wall thicknesses of 20 mm or above and steel pipes. A steel which contains by weight C: 0.02 to 0.06%, Si: 0.5% or below, Mn: 0.8 to 1.6%, P: 0.008% or below, S: 0.0008% or below, Al: 0.08% or below, Nb: 0.005 to 0.035%, Ti: 0.005 to 0.025%, Ca: 0.0005 to 0.0035% and further contains at need one or more of Cu: 0.5% or below, Ni: 1% or below, Cr: 0.5% or below, Mo: 0.5% or below and V: 0.1% or below and which has a CP value of 0.95 or below as defined by the formula: CP=4.46C(%)+2.37Mn(%)/6+{1.18Cr(%)+1.95Mo(%)+1.74V(%)}/5+{1.74Cu(%)+1.7Ni(%)}/15+22.36P(%) and a Ceq value of 0.30 or above as defined by the formula: Ceq=C(%)+Mn(%)/6+ {Cr(%)+Mo(%)+V(%)}/5+{Cu(%)+Ni(%)}/15
(FR)L'invention porte sur un acier pour tubes de pipelines à haute résistance mécanique résistant à l'acide et présentant une excellente résistance aux criques dues à l'hydrogène (HIC) pour satisfaire aux exigences des pipelines résistant à l'acide d'une épaisseur de paroi de 20 mm ou plus et des tubes d'acier. L'acier comporte en poids: C: 0,02 à 0,06%, Si: 0,5% ou moins, Mn: 0,8 à 1,6%, P: 0,008% ou moins, S: 0,0008% ou moins, Al: 0,08% ou moins, Nb: 0,005 à 0,035%, Ti: 0,005 à 0,025%, Ca: 0,0005 à 0,0035% et contient en outre si nécessaire un ou plusieurs de Cu: 0,5% ou moins, Ni: 1% ou moins, Cr: 0,5% ou moins, Mo: 0,5% ou moins et V: 0,1% ou moins; et présente une valeur d'indice CP de 0,95 ou moins définie par la formule:CP=4,46C(%)+2,37Mn(%)/6+{1,18Cr(%)+1,95Mo(%)+1,74V(%)}/5+{1,74Cu(%)+1,7Ni(%)}/15+22,36P(%) et une valeur de Ceq de 0,30 ou plus définie par la formule: Ceq=C(%)+Mn(%)/6+ {Cr(%)+Mo(%)+V(%)}/5+{Cu(%)+Ni(%)}/15.
(JA)本発明は、管厚20mm以上の耐サワーラインパイプで要求される厳しい耐HIC性能にも対応できる,優れた耐HIC性を有する高強度耐サワーラインパイプ用鋼及び鋼管を提供する。具体的には、重量%にて、C:0.02~0.06%、Si:0.5%以下、Mn:0.8~1.6%、P:0.008%以下,S:0.0008%以下,Al:0.08%以下,Nb:0.005~0.035%、Ti:0.005~0.025%,Ca:0.0005~0.0035%を含有し、さらに必要に応じてCu:0.5%以下、Ni:1%以下、Cr:0.5%以下、Mo:0.5%以下、V:0.1%以下,のうち1種または2種以上を含有し、CP=4.46C(%)+2.37Mn(%)/6+{1.18Cr(%)+1.95Mo(%)+1.74V(%)}/5+{1.74Cu(%)+1.7Ni(%)}/15+22.36P(%)で表されるCP値が0.95以下、Ceq=C(%)+Mn(%)/6+{Cr(%)+Mo(%)+V(%)}/5+{Cu(%)+Ni(%)}/15で表されるCeq値が0.30以上である。
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, 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, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, 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 (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MT, NL, NO, PL, PT, RO, SE, SI, SK, 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)