According to whether there is a weld seam on pipe wall, construction steel pipe is divided into seamless steel pipe and welded steel pipe. Seamed steel pipe is also divided into spiral welded pipe and LSAW steel pipe according to the different kinds of weld seam. Both of those are used very commonly in the construction piling, structure, steel structure, load bearing, drainage and other aspects of the application. The material of construction steel pipe mainly includes carbon steel, stainless steel, and alloy steel. Among those material, carbon steel material application is the most extensive. The length of the steel pipe can be carried out length according to the requirements of customer, and also can be scattered feet. Construction seamless steel pipe can be divided into: hot-rolled seamless pipe, cold drawn tube, precision steel pipe, thermal expansion pipe, cold spinning pipe and extrusion pipe according to the production method. Hot-rolled tubes are used more in the construction industry.