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　　With the development of carbon steel line pipe plate technology and the progress of welded pipe forming and welding technology, the application scope of welded pipe for pipeline is gradually expanding, especially the advantage of welded pipe in the range of large-diameter group distance is more obvious and wet, coupled with the cost factor, welded pipe has occupied the leading position in the field of pipeline pipe, limiting the development of carbon steel line pipe.

　　At present,the production of API 5L Carbon Steel Line Pipe Industry adopts microalloying heating treatment process. The production ost of carbon steel line pipe is significantly higher than that of welded pipe. Moreover, with the improvement of steel grade, such as the limitation of carbon equivalent of steel grade pipeline above X80, the conventional process of carbon steel line pipe is difficult to meet the user's requirements. At present, all carbon steel line pipe manufacturers are in the process of improving the corrosion resistance of their pipeline pipes at low temperature . scientific research work shall be carried out for stable performance in high temperature environment.

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