Pipe commonly used material for: Q235A, Q235C, Q235B, 16Mn, 20 #, Q345, L245, L290, X42, X46, X60, X80,0Cr13,1Cr17,00Cr19Ni11,1Cr18Ni9,0Cr18Ni11Nb so on.
Welded steel pipe is used in steel or steel billets, because different welding processes and into the furnace pipe, carbon steel erw pipe and automatic arc welded. Because of the different forms of welding pipe into two and spiral welded pipe. Because the shape of the ends of the pipe and is divided into circular shaped (square, flat, etc.) pipe.