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1. 发明公开

EP1500457A1 Method for producing an ultrahigh strength welded steel pipe excellent in cold cracking resistance of weld metal 有权
标题翻译：用氢脆和方法改进的耐高强度钢的焊接管的制造管
公开(公告)号：EP1500457A1
公开(公告)日：2005-01-26
申请号：EP04017463.3
申请日：2004-07-23
申请人： NIPPON STEEL CORPORATION
发明人： Takuya, Hara c/o NIPPON STEEL CORPORATION , Hitoshi, Asahi c/o NIPPON STEEL CORPORATION
IPC分类号： B23K9/18 , B23K9/025 , B23K9/23 , B23K35/30
CPC分类号： B23K35/0261 , B23K9/0253 , B23K9/186 , B23K9/23 , B23K35/3066 , B23K2201/06 , B23K2203/04 , Y10T428/12972
摘要： The present invention, in a welded joint of steel sheets and a steel pipe body having a tensile strength of 800 MPa or more (over X100 in API Standards), provides: the welded joint of the steel sheets and the steel pipe produced by forming a steel sheet into a cylindrical shape and welding both the ends thereof, both excellent in cold cracking resistance; and methods for producing them. The present invention includes an ultrahigh strength welded joint and an ultrahigh strength welded steel pipe excellent in the cold cracking resistance of a weld metal, characterized in that the amount of nondiffusible hydrogen in the inner side weld metal is 0.01 ppm or more. It is preferable that the ratio of the nondiffusible hydrogen amount to the total hydrogen amount in said inner side weld metal is 0.5% or more. Further, it is preferable that Mo carbide is contained by not less than 1 piece/µm 2 in said inner side weld metal. The present invention also includes a method for producing said welded joint and welded steel pipe, characterized by welding the butted portion from the inner side and thereafter welding it from the outer side so that the reheating temperature of the inner side weld metal may reach within the range from 500°C to 700°C.
摘要翻译：本发明中，在钢板的焊接接头和具有800MPa以上的（在API标准超过X100）的抗拉强度的钢管体，提供了：钢板的焊接接头和钢管通过形成生产钢板成圆筒形状，并且焊接它们两者，无论是在寒冷的耐龟裂性优良的端部; 和方法生产它们。本发明包括在超高强度焊接接头和超高强度的焊接钢管具有优异的冷裂纹的焊接金属的电阻，其特征在于的确在内侧焊接金属氢不可扩散的量为00:01 ppm以上。优选所做的量非扩散氢在焊缝金属中的总氢量的比率所述内侧是0.5％以上。此外，优选的是没有沫碳化物是通过不小于1片载/微米<2>中所述的内侧焊接金属。因此，本发明包括用于生产所述的方法焊接接头和焊接钢管，通过焊接从内侧的对接部，然后从外侧焊接它如此做了内侧焊接金属的加热温度可以内达到其特点范围从500℃至700℃

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