With the development of API 5L pipeline steel pipe technology and the progress of welded pipe forming and welding technology, the application range of pipeline welded pipe is gradually expanding, especially the advantages of welded pipe in the range of large-diameter group spacing are more clear and wet, and cost factors, API 5L pipeline steel pipe has occupied a leading position in the field of line pipe, restricting the development of stainless steel seamless line pipe.
The production of API 5L pipeline steel pipe adopts microalloying heating treatment process, and the production cost of stainless steel seamless pipe is significantly higher than that of welded pipe.
And with the improvement of API 5L pipeline steel pipe grade, such as the carbon equivalent limit of X80 and above steel grade line pipe, the conventional seamless steel pipe process is difficult to meet user requirements; each API 5L pipeline steel pipe production plant is trying to improve its pipeline The anti-corrosion performance of the tube, the stable use performance in low temperature and high temperature environment, carry out scientific research work.