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    SEAMLESS STEEL PIPE FOR LINE PIPE AND METHOD FOR PRODUCING SAME
    1.
    发明公开
    SEAMLESS STEEL PIPE FOR LINE PIPE AND METHOD FOR PRODUCING SAME 有权
    NAHTLOSES STAHLROHRFÜRLEITUNGSROHR UND HERSTELLUNGSVERFAHRENDAFÜR

    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。