The steel pipe is not only used to transport fluid and powdered solids, heat exchange, and manufacture of mechanical parts and containers, it is an economical steel. Steel pipe manufacturing building structure grid, pillars and mechanical bracket, you can reduce weight and save 20 to 40% of metal, and factory mechanized construction. (Tianjin Steel Tube Company processing plant to a steel grid structure, the actual savings steel of 42.9%), Steel Pipe Manufacturing roads and bridges will not only save steel, simplifying construction, and can greatly reduce the area of ??the coating protective layer, saving the investment and maintenance costs . Therefore, any other type of steel can not completely replace the pipe, but the steel pipe can replace part of the profiles and rods. The relationship between the steel pipe for national economic development and the improvement of the quality of human life is great, better than other steel products. Guns, bullets, missiles, rockets, and so can not be separated from the steel pipe from people's daily utensils, furniture, water supply and drainage, gas supply, ventilation and heating facilities to a variety of farm machinery and tool manufacturing, development of underground resources, defense and aerospace.