A pipeline and steel pipe having superior resistanceto carbon dioxide corrosion and suitable for transportingcrude oil, natural gas and the like containing carbondioxide. The pipeline includes in combination, pipesections including a base metal having a compositioncontaining not more than 0.25 wt% of C, from 0.01 to 0.50wt% of Si; from 0.1 to 2.0 wt% of Mn; not more than 0.03wt% of P; not more than 0.01 wt% of S; from 0.25 to 1.0wt% of Cr; from 0.01 to 0.10 wt% of A?, and the balancesubstantially Fe and inevitable impurities, and a weldmetal connecting the pipe sections together having a Crcontent ranging between a value which is 0.2 wt% smallerthan the Cr content of the base metal and a value which is1.0 wt% greater than the Cr content of the base metal.The method of the invention includes circumferentialwelding for connecting steel pipes together by gas-metalarc welding using a welding wire containing Cr and Ti insuch amounts as to meet the condition of:Cr wt% + 3 x Ti wt% 2.4 wt% wherein, Cr wt% and Ti wt%respectively represent the contents of Cr and Ti of thewelding wire in wt%.
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机译：具有优异阻力的管道和钢管抗二氧化碳腐蚀，适合运输含碳的原油，天然气等二氧化碳。管道包括管道型材，包括具有成分的贱金属含有不超过0.25 wt％的C，0.01至0.50硅的重量％; Mn的0.1至2.0重量％;不超过0.03P的重量％;不超过S的0.01 wt％;从0.25到1.0Cr的重量％; 0.01至0.10 wt％的A2，其余铁和不可避免的杂质，以及焊缝将具有Cr的管段连接在一起的金属含量介于小0.2 wt％之间比贱金属的Cr含量高比贱金属的Cr含量高1.0重量％。本发明的方法包括圆周气金属连接钢管焊接使用含有Cr和Ti的焊丝进行电弧焊满足以下条件的金额：Cr wt％+ 3 x Ti wt％2.4 wt％其中，Cr wt％和Ti wt％分别代表Cr和Ti的含量焊丝的重量百分比。
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