Steel pipe for roads and bridges, according to forming processing can be divided into seamless steel pipe and welding steel pipe. Welding steel pipe according to different welding procedures is divided into spiral steel pipe, ERW steel pipe. The applications of both welding pipes are very widely and common for pilling, structure, steel structure, weight bearing, drains etc. The main materials are carbon steel, stainless steel, and alloy steel. Carbon steel material using is the most widely, the main production a base of china is in Cangzhou, Hebei. In accordance with different requirements by the customers, the length of steel pipe can be supply fixed and random, the price of fixed length is more higher.

Seamless steel pipe according to the production method can be divided into: hot rolling seamless pipe, cold drawn seamless pipe, precision steel pipes, hot expanding pipe, cold rotary extruding pipe and extruding pipe. The rang of using of hot rolling pipe is the most widely in the construction industry.

Hot rolling, as the name suggests, the temperature is high, so the deforming resistance is small, can achieve big amount of deformation. Both ends of the pipe of the project should be plain, the burrs at pipe ends should be clean up. the main materials for roads and bridges construction are 10#, 20#, 35#, 45#, 16Mn, Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, X42, X52, etc.. Different materials and manufacturing processes are adopted as per different working conditions.