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1. (WO2018025778) SEAMLESS STEEL PIPE AND METHOD FOR PRODUCING SAME
Latest bibliographic data on file with the International Bureau    Submit observation

Pub. No.:    WO/2018/025778    International Application No.:    PCT/JP2017/027529
Publication Date: 08.02.2018 International Filing Date: 28.07.2017
IPC:
C22C 38/00 (2006.01), C21D 8/10 (2006.01), C21D 9/08 (2006.01), C22C 38/54 (2006.01)
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION [JP/JP]; 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071 (JP)
Inventors: MIKI, Takeshi; (JP).
ARAI, Yuji; (JP).
MIHARA, Yusuke; (JP).
UCHIDA, Yohsuke; (JP).
YAMAZAKI, Masahiro; (JP).
YAMAMOTO, Masayuki; (JP)
Agent: BRIGHTAS IP ATTORNEYS; 2-5-10, Sonezaki, Kita-ku, Osaka-shi, Osaka 5300057 (JP)
Priority Data:
2016-150947 01.08.2016 JP
Title (EN) SEAMLESS STEEL PIPE AND METHOD FOR PRODUCING SAME
(FR) TUBE D'ACIER SANS SOUDURE ET SON PROCÉDÉ DE PRODUCTION
(JA) 継目無鋼管およびその製造方法
Abstract: front page image
(EN)A seamless steel pipe which has a chemical composition that contains, in mass%, 0.10-0.20% of C, 0.05-1.0% of Si, 0.05-1.2% of Mn, 0.025% or less of P, 0.005% or less of S, 0.20% or less of Cu, 0.007% or less of N, 0.20-0.50% of Ni, 0.30% or more but less than 0.50% of Cr, 0.30-0.50% of Mo, 0.01-0.05% of Nb, 0.001-0.10% of Al, 0.0005-0.0020% of B, 0.003-0.050% of Ti, 0.01-0.20% of V and 0-0.025% in total of one or more elements selected from among Ca, Mg and REM, with the balance made up of Fe and unavoidable impurities, and wherein: Pcm = (C + (Si/30) + (Mn/20) + (Cu/20) + (Ni/60) + (Cr/20) + (Mo/15) + (V/10) + 5B) ≤ 0.30; the tempered martensite in the metal structure is 90% by area or more; the tensile strength is 980 MPa or more; and the Charpy impact value at -40°C as determined using a 2 mm V-notch test piece is 75 J/cm2 or more.
(FR)L'invention concerne un tuyau d'acier sans soudure dont la composition chimique contient, en pourcentage en masse, 0,10 à 0,20% de C; 0,05 à 1,0% de Si; 0,05 à 1,2% de Mn; au plus 0,025% de P; au plus 0,005% de S; au plus 0,20% de Cu; au plus 0,007% de N; 0,20 à 0,50% de Ni, 0,30% ou plus mais moins de 0,50% de Cr; 0,30 à 0,50% de Mo; 0,01 à 0,05% de Nb; 0,001 à 0,10% d'Al; 0,0005 à 0,0020% de B; 0,003 à 0,050% de Ti; 0,01 à 0,20% de V et 0 à 0,025% au total d'un ou de plusieurs éléments choisis parmi Ca, Mg et REM, le reste étant constitué de Fe et d'impuretés inévitables. Dans ladite composition: Pcm = (C + (Si/30) + (Mn/20) + (Cu/20) + (Ni/60) + (Cr/20) + (Mo/15) + (V/10) + 5B) ≤ 0,30; la martensite revenue dans la structure métallique est supérieure ou égale à 90% par aire; la résistance à la traction est d'au moins 980 MPa; et la valeur de résilience Charpy à -40°C, déterminée par éprouvette entaillée en V de 2 mm, est d'au moins 75 J/cm2
(JA)化学組成が、質量%で、C:0.10~0.20%、Si:0.05~1.0%、Mn:0.05~1.2%、P≦0.025%、S≦0.005%、Cu≦0.20%、N≦0.007%、Ni:0.20~0.50%、Cr:0.30%以上0.50%未満、Mo:0.30~0.50%、Nb:0.01~0.05%、Al:0.001~0.10%、B:0.0005~0.0020%、Ti:0.003~0.050%、V:0.01~0.20%、Ca、MgおよびREMのいずれか1種以上の合計:0~0.025%、残部:Feおよび不純物であり、Pcm(=C+(Si/30)+(Mn/20)+(Cu/20)+(Ni/60)+(Cr/20)+(Mo/15)+(V/10)+5B)≦0.30であり、金属組織が、面積%で、焼戻しマルテンサイト≧90%であり、引張強度≧980MPa、2mmVノッチ試験片を用いた-40℃でのシャルピー衝撃値≧75J/cm2である、継目無鋼管。
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, JO, 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 (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)