ASTM A53 / A53M - 10 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless.
       ASTM A106 / A106M - 11 Standard Specification for Seamless Carbon Steel Pipe for High Temperature Service.
       API 5L refers to API 5L line pipe,which is out of the ground the oil, gas, water, transported by pipeline to pipe oil and gas industry companies,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.