公开(公告)号：EP1918397A4

公开(公告)日：2009-08-19

申请号：EP06782899

申请日：2006-08-22

申请人： SUMITOMO METAL IND

发明人： KONDO KUNIO ,  ARAI YUJI ,  HISAMUNE NOBUYUKI

IPC分类号： C22C38/00 ,  C21D8/10 ,  C21D9/08 ,  C22C38/12 ,  C22C38/58

CPC分类号： C22C38/005 ,  C21D8/105 ,  C21D9/08 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  Y10S148/909

摘要： Disclosed is a seamless steel pipe for line pipes which is suitable for flowlines or risers since it has high strength, excellent toughness and good corrosion resistance even when it is formed thick. This seamless steel pipe for line pipes has a chemical composition consisting of, in mass%, 0.02-0.08% of C, not more than 0.5% of Si, 1.5-3.0% of Mn, 0.001-0.10% of Al, more than 0.4% and not more than 1.2% of Mo, 0.002-0.015% of N, 0.0002-0.007% of Ca and one or two of REM in total, and the balance of Fe and impurities. In the impurities, P is not more than 0.05%, S is not more than 0.005%, and O is not more than 0.005%. The seamless steel pipe for line pipes satisfies the following formula: 0.8 = [Mn] × [Mo] = 2.6 (wherein [Mn] and [Mo] represent values equivalent to respective contents of Mn and Mo in mass%).

公开(公告)号：EP1876254A4

公开(公告)日：2012-08-01

申请号：EP06728830

申请日：2006-03-09

申请人： SUMITOMO METAL IND

发明人： KONDO KUNIO ,  ARAI YUJI ,  HISAMUNE NOBUYUKI

IPC分类号： C22C38/00 ,  B21B23/00 ,  C21D8/10 ,  C21D9/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/58

CPC分类号： C22C38/00 ,  B21B19/04 ,  B21B23/00 ,  C21D8/10 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/58

公开(公告)号：EP1918398A4

公开(公告)日：2009-08-19

申请号：EP06782902

申请日：2006-08-22

申请人： SUMITOMO METAL IND

发明人： KOBAYASHI KENJI ,  OMURA TOMOHIKO ,  KONDO KUNIO ,  ARAI YUJI ,  HISAMUNE NOBUYUKI

IPC分类号： C22C38/00 ,  C21D8/10 ,  C21D9/08 ,  C22C38/12 ,  C22C38/58

CPC分类号： C22C38/005 ,  C21D8/105 ,  C21D9/08 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  Y10S148/909

摘要： Disclosed is a seamless steel pipe for line pipes which has high strength and stable toughness while exhibiting good sulfide corrosion cracking resistance over a temperature range from low temperature to room temperature. The seamless steel pipe has a chemical composition consisting of, in mass%, 0.03-0.08% of C, 0.05-0.5% of Si, 1.0-3.0% of Mn, more than 0.4% and not more than 1.2% of Mo, 0.005-0.100% of Al, 0.001-0.005% of Ca and the balance of Fe and impurities including N, P, S, O and Cu. In the impurities, N is not more than 0.01%, P is not more than 0.05%, S is not more than 0.01%, O is not more than 0.01%, and Cu is not more than 0.1%. The seamless steel pipe has a microstructure composed of a bainite-martensite duplex structure.

摘要翻译： 公开了一种用于管线管的无缝钢管，其具有高强度和稳定的韧性，同时在从低温到室温的温度范围内表现出良好的抗硫化物腐蚀开裂性。 该无缝钢管具有以质量％计含有C：0.03〜0.08％，Si：0.05〜0.5％，Mn：1.0〜3.0％，Mo：0.4％以上且1.2％以下，Mo：0.005 -0.100％的Al，0.001-0.005％的Ca和余量的Fe以及包括N，P，S，O和Cu的杂质。 在杂质中，N不大于0.01％，P不大于0.05％，S不大于0.01％，O不大于0.01％，Cu不大于0.1％。 无缝钢管具有由贝氏体 - 马氏体双相组织构成的显微组织。

公开(公告)号：EP1918395A4

公开(公告)日：2011-09-14

申请号：EP06781670

申请日：2006-07-26

申请人： SUMITOMO METAL IND

发明人： ARAI YUJI ,  KONDO KUNIO ,  HISAMUNE NOBUYUKI

IPC分类号： C22C38/00 ,  C21D8/10 ,  C21D9/08 ,  C22C38/58

CPC分类号： C21D8/10 ,  C21D9/08 ,  C22C38/001 ,  C22C38/002 ,  C22C38/44 ,  C22C38/50 ,  C22C38/52

公开(公告)号：EP1918400A4

公开(公告)日：2009-08-19

申请号：EP06796613

申请日：2006-08-22

申请人： SUMITOMO METAL IND

发明人： ARAI YUJI ,  KONDO KUNIO ,  HISAMUNE NOBUYUKI

IPC分类号： C22C38/00 ,  C21D8/10 ,  C21D9/08 ,  C22C38/12 ,  C22C38/58

CPC分类号： C22C38/005 ,  C21D8/105 ,  C21D9/08 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  Y10S148/909

摘要： Disclosed is a seamless steel pipe for line pipes which has high strength, good toughness and good corrosion resistance even when it is formed thick. This seamless steel pipe for line pipes has a chemical composition consisting of, in mass%, 0.02-0.08% of C, not more than 0.5% of Si, 1.5-3.0% of Mn, 0.001-0.10% of Al, more than 0.4% and not more than 1.2% of Mo, 0.002-0.015% of N, 0.0002-0.007% of Ca, and the balance of Fe and impurities. In the impurities, P is not more than 0.03%, S is not more than 0.005%, O is not more than 0.005%, and B is less than 0.0005%. The seamless steel pipe for line pipes is also characterized in that the value of Pcm calculated by the formula (1) below is not less than 0.185 and not more than 0.250, and the seamless steel pipe has a metal structure mainly composed of bainite wherein the length of cementite is not more than 20 µm. Pcm = [C] + [Si]/30 + ([Mn] + [Cr] + [Cu])/20 + [Mo]/15 + [V]/10 + 5[B] (1) In the formula, [C], [Si], [Mn], [Cr], [Cu], [Mo], [V] and [B] represent numbers corresponding to respective contents of C, Si, Mn, Cr, Cu, Mo, V and B expressed in mass%.