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公开(公告)号：EP4227424A1
公开(公告)日：2023-08-16
申请号：EP21877704.3
申请日：2021-10-07
发明人： MATSUO, Daisuke , TOMIO, Yusaku
摘要： A martensitic stainless steel material that has high strength and is excellent in SSC resistance is provided. A martensitic stainless steel material according to the present disclosure contains, in mass%, C: 0.030% or less, Ni: 5.05 to 7.50%, Cr: 10.00 to 14.00%, and Mo: 1.50 to 3.50%, and has a yield strength of 758 MPa or more, and on two line segments LS of 1000 µm extending in a wall thickness direction with arbitrary two points as a center located at positions at a depth of 2 mm from the inner surface, a degree of Cr segregation ΔCr defined by Formula (1) and a degree of Mo segregation ΔMo defined by Formula (2) satisfy Formula (3): Δ Cr = Cr * max − Cr * min / Cr * ave Δ Mo = Mo * max − Mo * min / Mo * ave Δ Cr + Δ Mo ≤ 0.59
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公开(公告)号：EP4130317A1
公开(公告)日：2023-02-08
申请号：EP20928920.6
申请日：2020-04-01
发明人： MATSUO, Daisuke , TOMIO, Yusaku
摘要： Provided is a steel material having excellent SSC resistance. The steel material of the present disclosure includes a chemical composition consisting of, in mass%, C: 0.035% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0050% or less, sol. Al: 0.005 to 0.100%, N: 0.001 to 0.020%, Ni: 5.00 to 7.00%, Cr: 10.00 to 14.00%, Cu: 1.50 to 3.50%, Mo: 1.00 to 4.00%, V: 0.01 to 1.00%, Ti: 0.02 to 0.30%, Co: 0.01 to 0.50%, Ca: 0.0003 to 0.0030%, O: 0.0050% or less, W: 0 to 1.50%, Nb: 0 to 0.50%, B: 0 to 0.0050%, Mg: 0 to 0.0050%, and rare earth metals (REM): 0 to 0.020%, with the balance being Fe and impurities, in which a total number density of Mn sulfide having an equivalent circular diameter of 1.0 µm or more and Ca sulfide having an equivalent circular diameter of 2.0 µm or more is 0.50 pieces/mm 2 or less.
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公开(公告)号：EP4286543A1
公开(公告)日：2023-12-06
申请号：EP21922842.6
申请日：2021-01-28
发明人： MATSUO, Daisuke , TOMIO, Yusaku
摘要： Provided is a steel material having excellent SSC resistance. The steel material of the present disclosure includes a chemical composition consisting of, in mass%, C: 0.035% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0050% or less, sol. Al: 0.005 to 0.100%, N: 0.001 to 0.020%, Ni: 5.00 to 7.50%, Cr: 10.00 to 14.00%, Cu: 0.01 to less than 1.50%, Mo: 1.50 to 3.50%, V: 0.01 to 1.00%, Ti: 0.02 to 0.30%, Co: 0.01 to 0.50%, Ca: 0.0003 to 0.0030%, O: 0.0050% or less, W: 0 to 1.50%, Nb: 0 to 0.50%, B: 0 to 0.0050%, Mg: 0 to 0.0050%, and rare earth metals (REM): 0 to 0.020%, with the balance being Fe and impurities, in which a total number density of Mn sulfide having an equivalent circular diameter of 1.0 µm or more and Ca sulfide having an equivalent circular diameter of 2.0 µm or more is 0.50 /mm 2 or less.
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公开(公告)号：EP4043590A1
公开(公告)日：2022-08-17
申请号：EP20874962.2
申请日：2020-10-01
发明人： TAKABE, Hideki , TOMIO, Yusaku , SAGARA, Masayuki
摘要： An alloy material is provided that has a chemical composition consisting of, in mass%, C: 0.030% or less, Si: 0.01 to 1.0%, Mn: 0.01 to 2.0%, P: 0.030% or less, S: 0.0050% or less, Cr: 28.0 to 40.0%, Ni: 32.0 to 55.0%, sol. Al: 0.010 to 0.30%, N: more than 0.30% and not more than 0.000214×Ni 2 -0.03012×Ni+0.00215×Cr 2 -0.08567×Cr+1.927, O: 0.010% or less, Mo: 0 to 6.0%, W: 0 to 12.0%, Ca: 0 to 0.010%, Mg: 0 to 0.010%, V: 0 to 0.50%, Ti: 0 to 0.50%, Nb: 0 to 0.50%, Co: 0 to 2.0%, Cu: 0 to 2.0%, REM: 0 to 0.10%, and the balance: Fe and impurities, and in which Fn1 = Mo+(1/2)W is 1.0 to 6.0, and a yield strength at a 0.2% proof stress is 1103 MPa or more.
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5.发明公开
公开(公告)号：EP3960885A1
公开(公告)日：2022-03-02
申请号：EP20795705.1
申请日：2020-04-23
发明人： KATO, Kosei , TOMIO, Yusaku
摘要： Provided is a duplex stainless seamless steel pipe having excellent low-temperature toughness. The duplex stainless seamless steel pipe according to the present disclosure has the chemical composition described in the description and a microstructure composed of 30.0 to 70.0% of ferrite, and austenite. In an observation field of view region of a square shape with a side of 1.0 mm, the region including a center portion of wall thickness and including an L direction and a T direction, four line segments extending in the T direction and dividing the observation field of view region into five equal parts in the L direction are defined as line segments T1 to T4. Four line segments extending in the L direction and dividing the observation field of view region into five equal parts in the T direction are defined as line segments L1 to L4. A number of intersections NT, which is the number of intersections between the line segments T1 to T4 and a ferrite interface, is 40.0 or more. A number of intersections NL, which is the number of intersections between the line segments L1 to L4 and the ferrite interface, and the number of intersections NT satisfy Formula (1). NT/NL ≥ 2.0
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公开(公告)号：EP4137591A1
公开(公告)日：2023-02-22
申请号：EP21788254.7
申请日：2021-04-13
发明人： TOMIO, Yusaku , MATSUO, Daisuke
摘要： A martensitic stainless steel material having a yield strength of 125 ksi or more, excellent low-temperature toughness in an extremely low-temperature environment, and excellent corrosion resistance, and a method for producing the martensitic stainless steel material are provided. The martensitic stainless steel material according to the present disclosure consists of C: less than 0.030%, Si: 1.00% or less, Mn: 0.05 to 2.00%, Cr: 11.50 to 14.00%, Ni: 5.00 to 7.50%, Mo: 1.10 to 3.50%, Cu: 0.50 to 3.50%, Co: 0.01 to 0.30%, Al: 0.001 to 0.100%, N: 0.001 to 0.100%, and the balance: Fe and impurities. The microstructure is composed of retained austenite in an amount of 0 to 15 vol%, and ferrite in an amount of 0 to 10 vol%, with the balance being martensite. The yield strength is 862 MPa or more, and a number density of Cu precipitates is 3.0 × 10 21 to 50.0 × 10 21 /m 3 .
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公开(公告)号：EP3943635A1
公开(公告)日：2022-01-26
申请号：EP20779299.5
申请日：2020-03-16
发明人： OKADA, Seiya , KAMITANI, Hiroki , KOMATSUBARA, Nobuaki , TOMIO, Yusaku , IKEDA, Shohei , SHIRASAWA, Naoya
摘要： Provided is a seamless steel pipe which has excellent SSC resistance in a sour environment and can achieve excellent accuracy of ultrasonic inspection. The seamless steel pipe according to the present disclosure includes a base material and a decarburized layer formed on the surface of the base material. The chemical composition of the base material consists of, in mass%, C: 0.20 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.01 to 1.00%, P: 0.0300% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.30 to 1.20%, Mo: 0.30 to 1.50%, Ti: 0.002 to 0.050%, V: 0.01 to 0.30%, Nb: 0.002 to 0.100%, B: 0.0001 to 0.0050%, N: 0.0100% or less, O: 0.0050% or less, and with the balance being Fe and impurities. The base material has a yield strength of 655 MPa or more, and a yield ratio of 85.0% or more. The decarburized layer has a depth of 150 µm or less.
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8.发明公开
公开(公告)号：EP4006177A1
公开(公告)日：2022-06-01
申请号：EP20843311.0
申请日：2020-07-17
摘要： A martensitic stainless steel pipe is provided that can reduce the increase in SCC susceptibility occurring at HAZs after welding. A martensitic stainless steel pipe has a chemical composition including, in mass %: 0.001 to 0.050 % C; 0.05 to 1.00 % Si; 0.05 to 1.00 % Mn; up to 0.030 % P; up to 0.0020 % S; below 0.50 % Cu; 11.50 to below 14.00 % Cr; above 5.00 to 7.00 % Ni; above 1.00 to 3.00 % Mo; 0.02 to 0.50 % Ti; 0.001 to 0.100 % Al; 0.0001 to 0.0040 % Ca; 0.0001 to below 0.0200 % N; and other elements, the number density of inclusions having an equivalent circle diameter exceeding 1.0 pm and containing Al in not less than 20 mass % and O in not less than 20 mass % being not higher than 50.0 inclusions/mm 2 , the atomic concentration ratio of Cr oxides to Fe oxides obtained by X-ray photoelectron spectroscopic analysis against the surface of the martensitic stainless steel pipe, Cr-O/Fe-O, being not lower than 0.30.
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公开(公告)号：EP3859031A1
公开(公告)日：2021-08-04
申请号：EP19867660.3
申请日：2019-09-26
发明人： MATSUO, Daisuke , TOMIO, Yusaku
摘要： A martensitic stainless steel material which can achieve excellent SSC resistance and hot workability at the same time is provided. The martensitic stainless steel material has a chemical composition, which contains: in mass%, C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.005% or less, Al: 0.010 to 0.100%, N: 0.0010 to 0.0100%, Ni: 5.00 to 6.50%, Cr: 10.00 to 13.40%, Cu: 1.80 to 3.50%, Mo: 1.00 to 4.00%, V: 0.01 to 1.00%, Ti: 0.050 to 0.300%, Co: 0.300% or less, Ca: 0.0006 to 0.0030%, and O: 0.0050% or less, and satisfies Formulae (1) and (2) in the description. An area of each intermetallic compound and each Cr oxide in the steel material is 5.0 µm 2 or less, a total area fraction of intermetallic compounds and Cr oxides is 3.0% or less, and a maximum circle-equivalent diameter of Ca oxide is 9.5 µm or less.
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公开(公告)号：EP3744865A1
公开(公告)日：2020-12-02
申请号：EP19744243.7
申请日：2019-01-17
发明人： TOMIO, Akiko , UEYAMA, Masaki , TOMIO, Yusaku
摘要： A Cr-Ni alloy having high yield strength and high resistance to sulfuric acid general corrosion at a high temperature of 250°C is provided. The Cr-Ni alloy has a chemical composition consisting of, in mass%, Si: 0.01 to 0.50%, Mn: 0.01 to 1.00%, Cr: 21.0 to 27.0%, Ni: 40.0 to less than 50.0%, Mo: 4.5 to less than 9.0%, W: 2.0 to 6.0%, Cu: more than 2.0% and not more than 6.0%, Co: 0.01 to 2.00%, one or two kinds selected from the group consisting of Ca and Mg: 0.001 to 0.010% in total, sol. Al: 0.005 to 0.200%, N: 0.01 to 0.20%, and the balance being Fe and impurities.
The dislocation density in the Cr-Ni alloy satisfies the following Formula (1): 8.00 × 10 14 ≤ ρ ≤ 2.50 × 10 15 + 1.40 × 10 14 × Cu + Co
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