What is steel pipe

Steel pipe is a kind of steel with hollow section, whose length is far greater than the diameter or circumference. It is divided into circular, square, rectangular and special-shaped steel pipes according to the section shape; It can be divided into carbon structural steel pipe, low alloy structural steel pipe, alloy steel pipe and composite steel pipe according to the material; It can be divided into steel pipes for transmission pipeline, engineering structure, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc; According to the production process, it can be divided into seamless steel pipe and welded steel pipe. Seamless steel pipe can be divided into hot rolling and cold rolling, and welded steel pipe can be divided into straight seam welded steel pipe and spiral seam welded steel pipe.

Steel pipe is not only used to transport fluid and powdery solid, exchange heat energy, manufacture mechanical parts and containers, but also an economic steel. Using steel pipes to manufacture building structure grids, pillars and mechanical supports can reduce weight, save 20~40% of metal, and realize factory mechanized construction. Using steel pipes to make highway bridges can not only save steel materials and simplify construction, but also greatly reduce the area of protective coating, save investment and maintenance costs.