... good tolerance for Outside Diameter and Thickness. Seamless steel pipe made in cold-drawn and hot-rolling, size such as ... are sch40, sch80, schSTD, schXS, sch160, and so on.Standard we can do is API 5L ... A106, ASTM A53, ASTM A335 and all kinds of Chinese Standard. Steel grade B, X42, X46, ... X52, X60, X70, X80, P1, P5, P9 and so on. cold drawn and hot rolling seamless steel pipe ...