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1. WO2020071348 - MARTENSITE-BASED STAINLESS STEEL SEAMLESS PIPE

Publication Number WO/2020/071348
Publication Date 09.04.2020
International Application No. PCT/JP2019/038696
International Filing Date 01.10.2019
IPC
C22C 38/00 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/52 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
52with cobalt
C21D 8/10 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING 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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
10during manufacturing of tubular bodies
CPC
C21D 8/10
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING 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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
10during manufacturing of tubular bodies
C22C 38/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/52
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
52with cobalt
Applicants
  • 日本製鉄株式会社 NIPPON STEEL CORPORATION [JP]/[JP]
Inventors
  • 神吉 恭平 KANKI, Kyohei
  • 相良 雅之 SAGARA, Masayuki
  • 富尾 悠索 TOMIO, Yusaku
Agents
  • アセンド特許業務法人 ASCEND IP LAW FIRM
Priority Data
2018-18777702.10.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) MARTENSITE-BASED STAINLESS STEEL SEAMLESS PIPE
(FR) TUYAU SANS SOUDURE EN ACIER INOXYDABLE À BASE DE MARTENSITE
(JA) マルテンサイト系ステンレス継目無鋼管
Abstract
(EN)
Provided is a martensite-based stainless steel seamless pipe having excellent general corrosion resistance in an enhanced mildly sour environment having an H2S partial pressure of over 0.03 bar and no more than 0.1 bar. This seamless steel pipe comprises a chemical composition fulfilling formula (1) and a microstructure comprising at least 80% by volume martensite and has a depassivation pH in the inner surface thereof of no more than 3.50. The chemical composition comprises, in % by mass: no more than 0.030% C, no more than 1.00% Si, no more than 1.00% Mn, no more than 0.030% P, no more than 0.0050% S, 0.001%–0.100% Al, no more than 0.0500% N, no more than 0.050% O, 3.00%–6.50% Ni, more than 10.0% and no more than 13.40% Cr, 0.50%–4.00% Mo, 0.01%–1.00% V, 0.010%–0.300% Ti, and 0.010%–0.300% Co, with the remainder being Fe and impurities. Cr + 2.0 Mo + 0.5 Ni + 0.5 Co ≥ 16.0 (1)
(FR)
L'invention concerne un tuyau sans soudure en acier inoxydable à base de martensite ayant une excellente résistance à la corrosion générale dans un environnement légèrement corrosif amélioré ayant une pression partielle de H2S supérieure à 0,03 bar et n'excédant pas 0,1 bar. Ce tuyau en acier sans soudure comprend une composition chimique répondant à la formule (1) et une microstructure comprenant au moins 80 % en volume de martensite et a un pH de dépassivation dans sa surface interne n'excédant pas 3,50. La composition chimique comprend, en % en masse : pas plus de 0,030 % de C, pas plus de 1,00 % de Si, pas plus de 1,00 % de Mn, pas plus de 0,030 % de P, pas plus de 0,0050 % de S, de 0,001 % à 0,100 % d'Al, pas plus de 0,0500 % de N, pas plus de 0 050 % de O, de 3,00 % à 6,50 % de Ni, plus de 10,0 % et pas plus de 13,40 % de Cr, de 0,50 % à 4,00 % de Mo, de 0,01 % à 1,00 % de V, de 0,010 % à 0,300 % de Ti, et de 0,010 % à 0,300 % de Co, le reste étant du Fe et des impuretés. Cr + 2,0 Mo + 0,5 Ni + 0,5 Co ≥ 16,0 (1)
(JA)
0.03超~0.1barのH2S分圧を含有するエンハンストマイルドサワー環境において優れた耐全面腐食性を有するマルテンサイト系ステンレス継目無鋼管を提供する。本開示による継目無鋼管は、質量%で、C:0.030%以下、Si:1.00%以下、Mn:1.00%以下、P:0.030%以下、S:0.0050%以下、Al:0.001~0.100%、N:0.0500%以下、O:0.050%以下、Ni:3.00~6.50%、Cr:10.00超~13.40%、Mo:0.50~4.00%、V:0.01~1.00%、Ti:0.010~0.300%、Co:0.010~0.300%、及び、残部:Fe及び不純物からなり、式(1)を満たす化学組成と、80.0体積%以上のマルテンサイトを含有するミクロ組織とを備え、内表面における脱不働態化pHが3.50以下である。 Cr+2.0Mo+0.5Ni+0.5Co≧16.0 (1)
Latest bibliographic data on file with the International Bureau