API line pipe is a line pipe that belongs to the American petroleum standard. The line pipe transports the oil, steam, and water extracted from the ground through the line pipe to the oil and natural gas industrial enterprises. Line pipes include seamless pipes and welded steel pipes. The pipe ends have flat ends, threaded ends and socket ends; the connection methods are end welding, coupling connection, socket connection, etc.
With the development of pipeline steel plate technology and the advancement of welded pipe forming and welding technology, the application scope of pipeline welded pipe is gradually expanding, especially the advantages of welded pipe in the range of large-diameter group spacing are more obvious. In addition to the cost factor, welded pipe has been The line pipe field occupies a leading position, which limits the development of stainless steel seamless line pipe. In 2004, the output of seamless line pipes was about 400,000 tons, with steel grades including X42-70, and varieties of onshore line pipes and subsea line pipes.
The production of high-grade steel-grade line pipes adopts microalloying heating treatment technology. The production cost of stainless steel seamless pipes is significantly higher than that of welded pipes. With the improvement of steel grades, such as X80 and above steel-grade line pipes, there is no limitation on carbon equivalent. The conventional process of seam steel pipes is difficult to meet user requirements; all 12Cr1moV alloy pipe manufacturers are carrying out scientific research to improve the corrosion resistance of their line pipes and the stable performance in low temperature and high temperature environments.
Pipeline steel material: L245, L360, A53, J55, N80, X42, X46, X52, X56, X60, X65, X70
Specification of pipeline steel pipe: ∮60-630×1.53-40
