api 5l sch 120 p235 tr2 a53 500mm Seamless Steel Pipe And Tube & hs code seamless steel pipe is perforated by the whole round steel, no weld on the surface of the steel pipe, called seamless steel pipe. According to the production method, seamless steel pipe can be divided into hot rolled seamless steel pipe, cold rolled seamless steel pipe, cold drawn seamless steel pipe, extrusion seamless steel pipe, pipe jacking and so on.According to the sectional shape, seamless steel pipe is divided into round and special-shaped two kinds, special-shaped pipe has square, oval, triangle,
hexagonal, melon seed, star, with a variety of complex shape of the wing tube.There are thick-walled seamless steel tubes and
thin-walled seamless steel tubes according to their use.Seamless steel pipe is mainly used as drilling pipe for petroleum geology,
cracking pipe for petrochemical industry, boiler and furnace pipe, bearing pipe and high-precision structural steel pipe for
automobile, tractor and aviation.