公开(公告)号：EP2028284B1

公开(公告)日：2012-05-16

申请号：EP07740796.3

申请日：2007-03-27

申请人： Nippon Steel Corporation

发明人： SHINOHARA, Yasuhiro ,  ISHITSUKA, Tetsuo ,  INOUE, Kazuhiro ,  KATO, Bunshi ,  TAKAMOTO, Teruhisa ,  OKAMOTO, Junichi

IPC分类号： C22C38/00 ,  C22C38/58 ,  B21B17/00 ,  B21B45/02 ,  B21C23/08 ,  C21D8/10 ,  C21D9/08

CPC分类号： B21B23/00 ,  C21D1/25 ,  C21D8/10 ,  C21D9/08 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14

摘要： Disclosed is a high-strength seamless steel pipe for use in a mechanical structure, which has the following chemical composition (by mass): C: not less than 0.03 and less than 0.1%; Mn: 0.8 to 2.5%; Ti: 0.005 to 0.035%; Nb: 0.003 to 0.04%; B: 0.0003 to 0.003%; Si: not more than 0.5%; Al: not more than 0.05%; P: not more than 0.015%; S: not more than 0.008%; and N: not more than 0.008%; and at least one component selected from the following components: Ni: 0.1 to 1.5%; Cr: 0.1 to 1.5%; Cu: 0.1 to 1.0%; and Mo: 0.05 to 0.5%; with the remainder being Fe and unavoidable impurities. In the steel pipe, the metallographic structure is a single structure comprising self-tempered martensite or a mixed structure comprising self-tempered martensite and lower bainite. The high-strength seamless steel pipe has excellent toughness and weldability.

公开(公告)号：EP2028284A1

公开(公告)日：2009-02-25

申请号：EP07740796.3

申请日：2007-03-27

申请人： Nippon Steel Corporation

发明人： SHINOHARA, Yasuhiro ,  ISHITSUKA, Tetsuo ,  INOUE, Kazuhiro ,  KATO, Bunshi ,  TAKAMOTO, Teruhisa ,  OKAMOTO, Junichi

IPC分类号： C22C38/00 ,  C22C38/58 ,  B21B17/00 ,  B21B45/02 ,  B21C23/08 ,  C21D8/10 ,  C21D9/08

CPC分类号： B21B23/00 ,  C21D1/25 ,  C21D8/10 ,  C21D9/08 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14

摘要： A high strength seamless steel pipe for machine structure use superior in toughness and weldability characterized by containing, by mass%, C: 0.03 to less than 0.1%, Mn: 0.8 to 2.5%, Ti: 0.005 to 0.035%, Nb: 0.003 to 0.04%, and B: 0.0003 to 0.003%, limiting Si: 0.5% or less, Al: 0.05% or less, P: 0.015% or less, S: 0.008% or less, and N: 0.008% or less, further containing one or more of Ni: 0.1 to 1.5%, Cr: 0.1 to 1.5%, Cu: 0.1 to 1.0%, and Mo: 0.05 to 0.5%, and having a balance of Fe and unavoidable impurities, the metallurgical structure being a single phase structure of self-tempered martensite or a mixed phase structure of self-tempered martensite and lower bainite.

摘要翻译： 一种高强度无缝钢管的机械结构用在韧性和焊接性，含有为特征的优良的，以质量％计，C：0.03〜小于0.1％以下，Mn：0.8〜2.5％以下，Ti：0.005〜0.035％以下，Nb：0.003〜 0.04％，以及B：0.0003〜0.003％，限制性的Si：0.5％或以下，Al：0.05％以下，P：0.015％以下，S：0.008％或以下，N：0.008％以下，还含有 一个或更多的Ni：0.1〜1.5％以下，Cr：0.1〜1.5％以下，Cu：0.1〜1.0％和Mo：0.05〜0.5％，且具有Fe和不可避免的杂质的平衡中，金属组织为单相 自回火马氏体或自回火马氏体与下贝氏体的混合相结构的结构。