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公开(公告)号：EP4286542A1
公开(公告)日：2023-12-06
申请号：EP22775695.4
申请日：2022-03-23
发明人： KANKI, Kyohei , TAKABE, Hideki
摘要： A martensitic stainless steel material that achieves both a high yield strength and excellent SSC resistance is provided. The martensitic stainless steel material according to the present disclosure consists of, in mass%, C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0050% or less, Cu: 0.01 to 3.50%, Cr: 10.00 to 14.00%, Ni: 4.50 to 7.50%, Mo: 1.00 to 4.00%, Ti: 0.050 to 0.300%, V: 0.01 to 1.00%, Al: 0.001 to 0.100%, Co: 0.010 to 0.500%, Ca: 0.0005 to 0.0050%, Sn: 0.0005 to 0.0500%, N: 0.0010 to 0.0500%, O: 0.050% or less, and the balance: Fe and impurities, and has a yield strength of 758 MPa or more. Within this range, the contents of elements and the yield strength satisfy Formula (1) described in the description.
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公开(公告)号：EP4424850A1
公开(公告)日：2024-09-04
申请号：EP22886984.8
申请日：2022-10-25
摘要： A martensitic stainless steel round bar that has high strength, excellent SSC resistance, and excellent SCC resistance in an environment of 175°C is provided. A martensitic stainless steel round bar of the present disclosure contains, in mass%, C: 0.030% or less, Cr: 10.00 to 14.00%, Ni: 5.00 to 7.50%, Mo: 1.50 to 4.00%, Cu: 1.00 to 3.50%, W: 0.01 to 2.00%, and Co: 0.010 to 0.500%, and has a yield strength of 862 MPa or more. When, at the center position of a cross section perpendicular to the axial direction of the martensitic stainless steel round bar, a dissolved Mo concentration in percent by mass is defined as [Mo]c, a dissolved W concentration in percent by mass is defined as [W]c, an Mo concentration in percent by mass in a residue obtained by constant-current electrolysis is defined as [Mo]R, and a W concentration in percent by mass in the residue is defined as [W]R, Formula (1) and Formula (2) are satisfied. F1=MoC+0.5WC≥2.45 F2=F1/MoR+WR≥13.0
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公开(公告)号：EP4411001A1
公开(公告)日：2024-08-07
申请号：EP22876450.2
申请日：2022-09-29
摘要： A martensitic stainless steel pipe that has a yield strength of 110 ksi or more and has excellent machinability is provided. A martensitic stainless steel pipe according to the present disclosure consists of, in mass%, C: less than 0.030%, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0010 to 0.0050%, Cr: 10.00 to 14.00%, Ni: 5.00 to 7.50%, Mo: 1.10 to 3.50%, Cu: 1.00 to 3.50%, Al: 0.005 to 0.050%, N: 0.0030 to 0.0500%, V: 0.01 to 0.30%, Ti: 0.020 to 0.150%, Co: 0.01 to 0.50%, Ca: 0.0010 to 0.0050%, and the balance: Fe and impurities. The yield strength is 758 MPa or more. A number density of Ca sulfides having an equivalent circular diameter of 1.0 µm or more is 3 /mm2 or more.
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4.发明公开
公开(公告)号：EP4431621A1
公开(公告)日：2024-09-18
申请号：EP22892640.8
申请日：2022-10-31
摘要： A martensitic stainless steel seamless pipe in which both a high yield strength, and excellent pitting resistance at the inner surface of the martensitic stainless steel seamless pipe are achieved is provided. A martensitic stainless steel seamless pipe according to the present disclosure has a chemical composition described in the description, the microstructure described in the description, and a yield strength of 862 MPa or more. An observation field of view region (50) which is 1.0 µm long in each of a pipe axis direction (L direction) and a pipe radius direction (T direction) and which includes an inner surface (10) extending in the L direction is composed of an inner surface vicinity region (20), an interior region (30) that is below contact with the inner surface vicinity region (20), and a hollow region (40). When the observation field of view region (50) is divided into sections by being divided equally into 256 sections in the L direction and divided equally into 256 sections in the T direction, an inner surface Cu occupancy OScu which is defined as the numerical proportion of sections in which a Cu concentration is more than 2.0% in the inner surface vicinity region (20), and an interior Cu occupancy OICu which is defined as the numerical proportion of sections in which the Cu concentration is more than 2.0% in the interior region (30) satisfy Formula (2). OSCu/OICu≥1.20
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公开(公告)号：EP3862455A1
公开(公告)日：2021-08-11
申请号：EP19869343.4
申请日：2019-10-01
发明人： KANKI, Kyohei , SAGARA, Masayuki , TOMIO, Yusaku
摘要： A martensitic stainless seamless steel pipe having excellent general corrosion resistance in an enhanced mild sour environment having an H 2 S partial pressure of more than 0.03 to 0.1 bar is provided. The seamless steel pipe according to the present disclosure includes a chemical composition consisting of, in mass%, C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0050% or less, Al: 0.001 to 0.100%, N: 0.0500% or less, O: 0.050% or less, Ni: 3.00 to 6.50%, Cr: more than 10.00 to 13.40%, Mo: 0.50 to 4.00%, V: 0.01 to 1.00%, Ti: 0.010 to 0.300%, and Co: 0.010 to 0.300%, with the balance being Fe and impurities, and satisfying Formula (1), and a microstructure containing, in volume ratio, 80.0% or more of martensite, wherein a depassivation pH of an inner surface is 3.50 or less. Cr + 2.0 Mo + 0.5 Ni + 0.5 Co ≥ 16.0
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公开(公告)号：EP3862451A1
公开(公告)日：2021-08-11
申请号：EP19868461.5
申请日：2019-10-01
摘要： A martensitic stainless seamless steel pipe having excellent general corrosion resistance in an enhanced mild sour environment having an H 2 S partial pressure of more than 0.03 to 0.1 bar is provided. The seamless steel pipe according to the present disclosure includes a chemical composition consisting of, in mass%, C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0050% or less, Al: 0.001 to 0.100%, N: 0.0500% or less, O: 0.050% or less, Ni: 5.00 to 6.50%, Cr: more than 10.00 to 13.40%, Cu: more than 1.50 to 3.50%, Mo: 1.00 to 4.00%, V: 0.01 to 1.00%, Ti: 0.050 to 0.300%, and Co: 0.010 to 0.300%, with the balance being Fe and impurities, and satisfying Formula (1), wherein a depassivation pH of an inner surface is 3.00 or less.
Cr + 2.0Mo + 0.5Ni + 2.0Cu + 0.5Co ≥ 20.0 (1)
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