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    • 21. 发明授权
    • Seamless steel pipe and manufacturing method thereof
    • 无缝钢管及其制造方法
    • US07815755B2
    • 2010-10-19
    • US12010459
    • 2008-01-25
    • Yuji AraiKunio KondoNobuyuki Hisamune
    • Yuji AraiKunio KondoNobuyuki Hisamune
    • C22C38/44C22C38/50
    • C21D8/10C21D9/08C22C38/001C22C38/002C22C38/44C22C38/50C22C38/52
    • The present invention relates to the following seamless steel pipes excellent in strength, toughness and weldability, particularly suitable for submarine flow lines, and a manufacturing method thereof. An as-quenched seamless steel pipe having a chemical composition consisting of, by mass%, C: 0.03 to 0.08%, Mn: 0.3 to 2.5%, Al: 0.001 to 0.10%, Cr: 0.02 to 1.0%, Ni: 0.02 to 1.0%, Mo: 0.02 to 0.8%, Ti: 0.004 to 0.010%, N: 0.002 to 0.008%, Ca: 0.0005 to 0.005%, and the balance Fe and impurities, with not more than 0.25% of Si, not more than 0.05% of P, not more than 0.005% of S, less than 0.005% Nb, and less than 0.0003% of B as the impurities, and having a microstructure consisting of not more than 20 volume% of polygonal ferrite, not more than 10 volume% of a mixed microstructure of martensite and retained austenite, and balance bainite. B can be 0.0003 to 0.001%. Mg and/or REM can be contained. The manufacturing method is characterized by the cooling rate during quenching.
    • 本发明涉及以下具有优异的强度,韧性和焊接性的无缝钢管,特别适用于海底流水线及其制造方法。 一种淬火后的无缝钢管,其组成为以质量%计含有C:0.03〜0.08%,Mn:0.3〜2.5%,Al:0.001〜0.10%,Cr:0.02〜1.0%,Ni:0.02〜 1.0%,Mo:0.02〜0.8%,Ti:0.004〜0.010%,N:0.002〜0.008%,Ca:0.0005〜0.005%,余量为Fe和杂质,不大于0.25% 0.05%的P,不大于0.005%的S,小于0.005%的Nb和小于0.0003%的作为杂质的B,并且具有由不大于20体积%的多边形铁素体组成的微结构,不大于10 马氏体和残留奥氏体的混合显微组织的体积%,以及平衡贝氏体。 B可以为0.0003〜0.001%。 可以含有Mg和/或REM。 制造方法的特征在于淬火时的冷却速度。
    • 22. 发明授权
    • Martensitic stainless steel
    • 马氏体不锈钢
    • US07767039B2
    • 2010-08-03
    • US11335676
    • 2006-01-20
    • Kunio KondoHisashi Amaya
    • Kunio KondoHisashi Amaya
    • C22C38/18
    • C22C38/42C22C38/02C22C38/04C22C38/44
    • A martensitic stainless steel having a resistance to sulfide stress corrosion cracking superior to Super 13 Cr steel and having a strength and corrosion resistance comparable to dual phase stainless steels has a chemical composition consisting essentially of, in mass %, C: 0.001-0.1%, Si: 0.05-1.0%, Mn: 0.05-2.0%, P: at most 0.025%, S: at most 0.010%, Cr: 11-18%, Ni: 1.5-10%, sol. Al: 0.001-0.1%, N: at most 0.1%, O: at most 0.01%, Cu: 0-5%, solid solution Mo: 3.5-7%, the composition satisfying the following Equation (1), optionally at least one element selected from at least one of the following Groups A-C, and a remainder of Fe and impurities and undissolved Mo, if undissolved Mo is present. Ni-bal.=30(C+N)+0.5(Mn+Cu)+Ni+8.2−1.1(Cr+Mo+1.5Si)≧−4.5  Equation (1) Group A—W: 0.2-5% Group B—V: 0.001-0.50%, Nb: 0.001-0.50%, Ti: 0.001-0.50%, and Zr: 0.001-0.50% Group C—Ca: 0.0005-0.05%, Mg: 0.0005-0.05%, REM: 0.0005-0.05%, and B: 0.0001-0.01%.
    • 具有优于超级13Cr钢的具有耐硫化应力腐蚀开裂性且具有与双相不锈钢相当的强度和耐腐蚀性的马氏体不锈钢的化学成分基本上以质量%计含有C:0.001-0.1% Si:0.05〜1.0%,Mn:0.05〜2.0%,P:0.025%以下,S:0.010%以下,Cr:11〜18%,Ni:1.5〜10% Al:0.001-0.1%,N:0.1%以下,O:0.01%以下,Cu:0-5%,固溶Mo:3.5〜7%,满足下述式(1)的组成, 选自以下组AC中的至少一个的元素,以及余量的Fe和杂质以及未溶解的Mo,如果不溶解的Mo存在。 Ni-bal = 30(C + N)+0.5(Mn + Cu)+ Ni + 8.2-1.1(Cr + Mo + 1.5Si)≥-4.5等式(1)组A-W:0.2-5% -V:0.001-0.50%,Nb:0.001-0.50%,Ti:0.001-0.50%,Zr:0.001-0.50%C-Ca:0.0005-0.05%,Mg:0.0005-0.05%,REM: 0.05%,B:0.0001-0.01%。
    • 25. 发明授权
    • Martensitic stainless steel
    • 马氏体不锈钢
    • US07361236B2
    • 2008-04-22
    • US10411186
    • 2003-04-11
    • Kunio KondoTakahiro KushidaYuichi KomizoMasaaki Igarashi
    • Kunio KondoTakahiro KushidaYuichi KomizoMasaaki Igarashi
    • C22C38/44C22C38/46C22C38/48C22C38/50
    • C22C38/44C21D8/005C21D8/0263C21D2211/008C22C38/42C22C38/46
    • A martensitic stainless steel having a C content of 0.01 to 0.1 mass %, a Cr content of 9 to 15 mass % and a N content of not more than 0.1 mass %, wherein the maximum length of the carbides in the steel is 10 to 200 nm in the direction of the minor axis, or wherein the ratio of the average Cr concentration [Cr] to the average Fe concentration [Fe] in carbides in the steel ([Cr]/[Fe]) is not more than 0.4, or wherein the content of M23C6 type carbides is not more than 1 volume %, the content of M3C type carbides is 0.01 to 1.5 volume % and the content of MN type or M2N type nitrides is not more than 0.3 volume % is provided. This stainless steel has a high toughness in spite of both a relatively more C content and a high strength, thereby providing a, wide applicability to pipe material for oil wells containing carbon dioxide and a small amount of hydrogen sulfide, in particular for oil wells having a much greater depth.
    • C含量为0.01〜0.1质量%,Cr含量为9〜15质量%,N含量为0.1质量%以下的马氏体系不锈钢,其中,碳的最大长度为10〜200 或其中钢中的碳化物中的平均Cr浓度[Cr]与平均Fe浓度[Fe]的比例([Cr] / [Fe]))不大于0.4,或者 其中M 23 C 6 C型碳化物的含量不超过1体积%,M 3 C型碳化物的含量为0.01〜 1.5体积%,并且MN型或M 2 N型氮化物的含量不大于0.3体积%。 该不锈钢虽然具有较高的C含量和较高的强度,但具有较高的韧性,从而为含有二氧化碳和少量硫化氢的油井的管道材料提供了广泛的应用,特别是对于具有 更深的深度
    • 26. 发明授权
    • Seamless steel tubes and method for producing the same
    • 无缝钢管及其制造方法
    • US07316143B2
    • 2008-01-08
    • US11592782
    • 2006-11-03
    • Kunio KondoYuji Arai
    • Kunio KondoYuji Arai
    • B21B19/04
    • C22C38/38C21D8/105C21D9/08Y10S72/70
    • A seamless steel tube comprising, in mass %, C: 0.30 to 0.50%, Si: 0.5% or less, Mn: 0.3 to 2.0%, P: 0.025% or less, S: 0.005% or less, Cr: 0.15 to 1.0%, Al: 0.001 to 0.05%, Ti: 0.005 to 0.05%, N: 0.02% or less, B: 0.0005 to 0.01% and O (oxygen): 0.0050% or less, wherein Beff defined in following equation (a) or (b) takes a value of 0.0001 or more, where Beff=B−10.8×(N−14×Ti/47.9)/14—(a) when Neff=N−14×Ti/47.9≧0, and Beff=B—(b) when Neff=N−14×Ti/47.9
    • 1.一种无缝钢管,以质量%计含有C:0.30〜0.50%,Si:0.5%以下,Mn:0.3〜2.0%,P:0.025%以下,S:0.005%以下,Cr:0.15〜1.0 %,Al:0.001〜0.05%,Ti:0.005〜0.05%,N:0.02%以下,B:0.0005〜0.01%,O(氧):0.0050%以下, (b)取值为0.0001以上,当Neff = N-14xTi / 47.9> = 0时,Beff = B-10.8x(N-14xTi / 47.9)/ 14-(a),Beff = B- )当Neff = N-14xTi / 47.9 <0时,能够提供具有优异的冷加工性,淬透性,韧性和扭转疲劳强度的无缝钢管,并且最适合用于制造一体式中空驱动轴 以及。