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

　　Seamless steel pipe are widely used.  API 5L X70 Natural Gas Industry Seamless Pipe for general use is rolled by common carbon structural steel, low alloy structural steel or alloy structural steel, with the largest output. It is mainly used as pipeline or structural parts for conveying fluids. .

　　According to different uses, there are three types of supply: A. supply according to chemical composition and mechanical properties; B. supply according to mechanical properties; C. supply according to hydraulic test. For steel pipes supplied according to category A and b, if they are used to withstand liquid pressure, hydrostatic tests should also be carried out.

　　Seamless pipe for special purposes include seamless pipes for boilers, chemical and electric power, seamless pipes for geology and seamless pipe  for petroleum, etc.

　　Seamless steel pipe has hollow section, which is widely used as pipeline for conveying fluids, such as oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, steel pipe has lighter weight when its flexural and torsional strength is the same, and it is a kind of steel with economic section.

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