Line steel 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 advantages more apparent, and cost factor, welded pipe has been dominant in the field of line pipe, which limits the development of the seamless line pipe. In 2007 domestic seamless line pipe, mainly including X42-70 in steel grade, varieties have a land line pipe and seabed pipeline. Production of high grade pipeline pipe currently USES 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 tube 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.