Classification of seamless steel pipes

　　The steel pipe made of a piece of metal, without a joint on the surface, is called seamless steel pipe. According to the production method, the seamless steel pipe is divided into hot rolled pipe, cold rolling pipe, cold drawing pipe, extrusion pipe, pipe jacking and so on. According to the section shape, seamless steel pipe is divided into two kinds: round and irregular. The special-shaped pipes are square, oval, triangular, hexagonal, melon shaped, star shaped, and finned tubes. The maximum diameter is 650mm, and the minimum diameter is 0.3mm. According to different uses, there are thick wall pipe and thin wall pipe. Seamless steel pipe are mainly used for petroleum geological drilling pipes, cracking pipes, boiler pipe, bearing pipes for petrochemical industry, and high-precision structural steel pipe for automobiles, tractors and aviation.

　　Seamless steel pipes are mainly used for petroleum geological drilling pipes, cracking pipes, boiler pipe, bearing pipes for petrochemical industry, and high-precision structural steel pipe for automobiles, tractors and aviation.

　　The steel pipe that is not seams along the circumference of its cross section. According to the different methods of production, they are divided into hot rolling pipe, cold rolling pipe, cold drawing pipe, extrusion pipe, pipe jacking and so on.

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