Development situation of line pipe

Line pipe With the development of the pipeline steel plate technology and the progress of welded pipe forming, welding technology, the application range of the pipe with welded pipe in gradually expanding, especially in the large diameter welded pipe class scope the advantage of more wet, and cost factors, welded pipe has been dominant in the field of line pipe, which limits the development of the seamless line pipe. About 2004 t 2004 seamless line pipe production, steel grade including X42-70, varieties have a land line pipe and seabed pipeline. The current production of high grade pipeline pipe is adopted micro alloying heat treatment process, the cost of production of seamless tube was obviously higher than that of welded pipe, and with the improvement of steel grade, such as the above X80 grade pipeline steel tube limits on carbon equivalent, seamless steel pipe of conventional technology is difficult to meet user requirements; Currently all seamless steel tube plant in order to improve the line pipe corrosion resistance, the use of stable performance and low temperature, high temperature environment to carry out the scientific research work.

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