Steel pipe and tube is a kind of steel with hollow cross-section, and its length is much larger than the diameter or circumference. Steel pipes and tubes are divided into round, square, rectangular and shaped steel pipes and tubes according to their cross-sectional shape; steel pipes and tubes are divided into carbon structural steel pipes and tubes, low-alloy structural steel pipes and tubes, alloy steel pipes and tubes and composite steel pipes and tubes according to their materials; steel pipes and tubes are divided into pipeline pipes, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc. Steel pipes and tubes are divided into seamless steel pipes and tubes and welded steel pipes and tubes according to their production process. Among them, seamless steel pipe is divided into hot-rolled and cold-rolled two, welded steel pipe is divided into straight seam welded steel pipe and spiral spiral welded pipe.

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