API 5L steel pipe is line pipe suited for the American Petroleum Institute standard API 5L line pipe. Line pipe is out of the ground the oil, gas, water, transported by pipeline to pipe oil and gas industry companies. Including seamless and welded line pipe steel, the pipe end with flat end, threaded end and socket end; its connection method for welding, coupling connection, socket connections. high grade line pipe heat treatment process. It is widely used in long distance transportation of liquid and gaseous substances, like water, oil and natural gas.
API 5L steel pipe according to the production process into seamless steel pipe, ERW steel pipe, submerged arc welding steel pipes, etc. 8. But the main use of a seamless steel pipe (Seamless), straight seam high frequency resistance welding steel (Electric-Resistance Arc Welding, abbreviated as ERW), LSAW steel pipe (Longigudinally Submerged Arc Welding, abbreviated as LSAW), spiral seam submerged arc welded pipe (Spirally Submerged Arc Welding, abbreviated as SSAW) four.
With the technology development and pipeline steel pipe forming, welding technology, the application of the pipeline with the pipe gradually expanding, especially in large-diameter steel pipe within the group benefits from the more pronounced wet, plus the cost factor , welded pipe in a dominant position, limiting the development of stainless steel seamless line pipe. Seamless pipe production line in 2004 about 40 million t, including steel grade X42-70, varieties of land and submarine line pipe.
API 5L steel pipe production is currently used micro-alloying heat treatment process, stainless steel seamless pipe production costs are significantly higher than the pipe, and with the improvement of steel grade, such as the X80 grade line pipe above the carbon equivalent of the restrictions, no pipe joints of conventional process is difficult to meet user requirements; present the 12Cr1moV alloy pipe production plant in order to improve its anti-corrosion pipeline tube, low temperature, high temperature stability and performance in carrying out research work.
