Steel Pipes are not only used for conveying fluid and powdery solids, exchanging heat energy, making mechanical parts and containers, but also a kind of economic steel. There are many kinds of steel pipes, which can be divided into seamless steel pipe and welded pipe. Steel pipes are widely used. Steel pipes are not only used for conveying fluid and powdery solids, exchanging heat energy, making mechanical parts and containers, but also a kind of economic steel. The use of steel pipe to make building structure net frame, pillar and mechanical support can reduce weight, save 20 ~ 40% of metal, and realize mechanized construction of factory. The use of steel pipe to make highway bridges can not only save steel and simplify construction, but also greatly reduce the area of coating protection layer, save investment and maintenance cost. The variety specifications of steel tube products are very various, and their performance requirements are also various. All of these should be distinguished with changes in user requirements or working conditions. Generally, the steel tube products are aslo classified according to the shape of the section, the method of production, the material of the pipe, the way of connection, the characteristics and the use of the coating. The steel pipe can be divided into round steel tube and special shape steel tube according to the cross section shape. The special-shaped steel pipe refers to a variety of non circular circular sections of the steel pipe. The main types are square tube, rectangular tube, elliptical tube, hexagonal tube, equilateral triangle tube and so on. The steel pipe is also the superior product of our company. In recent years, the export volume is high, the square tubes are exported 10 thousand tons every year, seamless steel pipe are 5000 tons of exports every year.