API SPEC 5L-2011 (line pipe specification), the American Petroleum Institute prepared and published, in the common parts of the world.
API 5L line pipe is including seamless steel pipe and welded steel pipe, among pipe end is with its flat end, threaded end and socket end; its connection to welding, coupling connections, socket connections.
Useage: used for oil and gas industry, gas, water, oil transportation.
according to the manufacture process and the tube bloom used different shapes, the line pipe can be divided into seamless steel pipe and welded steel pipe, among the usage quantity of welded steel pipe is more than seamless steel pipe.
Line pipe grade and chemical components
API 5L can be divided into API 5L PSL 1 and API 5L PSL 2, including API 5L PSL 1 level and the categories are: A, B, x42, x46, x52, x56, x60, x65, x70, API 5L PSL 2 level and the category is B, x42, x46, x52, x56, x60, x65, xx70, x80. the higher the level the stronger mechanical properties.