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1. (WO2017149570) LOW-ALLOY, HIGH-STRENGTH SEAMLESS STEEL PIPE FOR OIL WELL
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Pub. No.: WO/2017/149570 International Application No.: PCT/JP2016/004914
Publication Date: 08.09.2017 International Filing Date: 18.11.2016
IPC:
C22C 38/00 (2006.01) ,C22C 38/32 (2006.01) ,C21D 8/10 (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
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
32
with boron
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
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
10
during manufacturing of tubular bodies
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
Inventors:
岡津 光浩 OKATSU, Mitsuhiro; JP
柚賀 正雄 YUGA, Masao; JP
太田 裕樹 OTA, Hiroki; JP
藤村 和樹 FUJIMURA, Kazuki; JP
Agent:
熊坂 晃 KUMASAKA, Akira; JP
井上 茂 INOUE, Shigeru; JP
今江 敏夫 IMAE, Toshio; JP
Priority Data:
2016-03657429.02.2016JP
Title (EN) LOW-ALLOY, HIGH-STRENGTH SEAMLESS STEEL PIPE FOR OIL WELL
(FR) TUBE EN ACIER FAIBLEMENT ALLIÉ SANS SOUDURE A HAUTE RÉSISTANCE POUR PUITS DE PÉTROLE
(JA) 油井用低合金高強度継目無鋼管
Abstract:
(EN) A low-alloy, high-strength seamless steel pipe for an oil well is provided which has excellent SSC resistance. This steel pipe has a composition which contains, in mass%, C: 0.23-0.27%, Si: 0.01-0.35%, Mn: 0.45-0.70%, P: 0.010% or less, S: 0.001% or less, O: 0.0015% or less, Al: 0.015-0.080%, Cu: 0.02-0.09%, Cr: 0.8-1.5%, Mo: 0.5-1.0%, Nb: 0.02-0.05%, B: 0.0015-0.0030%, Ti: 0.005-0.020%, and N: 0.005% or less, wherein the value of the ratio (Ti/N) of the Ti content to the N content is 3.0-4.0, and the remainder is Fe and unavoidable impurities, and the value of the ratio (σ0.70.4) of the stress at 0.7% strain to the stress at 0.4% strain on the stress-strain curve is 1.02 or less, and the yield strength is 655 MPa or greater.
(FR) La présente invention concerne un tube en acier faiblement allié sans soudure à haute résistance pour puits de pétrole, possédant une excellente résistance à la fissuration sous contrainte de sulfure (SSC). Le présent tube en acier présente une composition qui contient, en % en masse, C : 0,23 à 0,27 %, Si : 0,01 à 0,35 %; Mn : 0,45 à 0,70 %, P : 0,010 % ou moins, S : 0,001 % ou moins, O : 0,0015 % ou moins, Al : 0,015 à 0,080 %, Cu : 0,02 à 0,09 %, Cr : 0,8 à 1,5 %, Mo : 0,5 à 1,0 %, Nb : 0,02 à 0,05 %, B : 0,0015 à 0,0030 %, Ti : 0,005 à 0,020 % et N : 0,005 % ou moins, la valeur du rapport (Ti/N) entre la teneur en Ti et la teneur en N étant de 3,0 à 4,0, et le reste étant du Fe et des impuretés inévitables, la valeur du rapport (σ0,70,4) entre la contrainte à 0,7 % de déformation et la contrainte à 0,4 % de déformation sur la courbe contrainte-déformation étant de 1,02 ou moins, et la limite d'élasticité étant de 655 MPa ou plus.
(JA) 耐SSC性に優れた油井用低合金高強度継目無鋼管を提供する。 質量%で、C:0.23~0.27%、Si:0.01~0.35%、Mn:0.45~0.70%、P:0.010%以下、S:0.001%以下、O:0.0015%以下、Al:0.015~0.080%、Cu:0.02~0.09%、Cr:0.8~1.5%、Mo:0.5~1.0%、Nb:0.02~0.05%、B:0.0015~0.0030%、Ti:0.005~0.020%、N:0.005%以下、を含有し、N含有量に対するTi含有量の比の値(Ti/N)が3.0~4.0であり、残部Feおよび不可避的不純物からなる組成を有し、応力-歪曲線における0.4%歪時の応力に対する0.7%歪時の応力の比の値(σ0.7/σ0.4)が1.02以下であり、降伏強度が655MPa以上であるようにする。
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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, 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, 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)