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　　Hollow Sections can be divided into seamless and welded seams. Seamless hollow sections is formed by extrusion of seamless round pipe. hollow sections, thick wall square steel pipe, large diameter hollow sections, seamless hollow sections, low alloy hollow sections, 20X20 Galvanized Steel Hollow Section, hollow sections for tower crane, Q345B low alloy hollow sections, 20 # seamless hollow sections

　　Common specifications and implementation standards

　　500*500*8~25 Hollow Sections Steel Pipe  140*140*4~14 Hollow Sections  Steel Pipe

　　135*135*4~14 Hollow Sections  Steel Pipe 130*130*4~12 Hollow Sections  Steel Pipe

　　450*450*8~25 Hollow Sections  Steel Pipe 120*120*4~12 Hollow Sections  Steel Pipe

　　400*400*8~25 Hollow Sections  Steel Pipe 110*110*4~12 Hollow Sections  Steel Pipe

　　350*350*8~25 Hollow Sections  Steel Pipe 100*100*4~12 Hollow Sections  Steel Pipe

　　300*300*8~25 Hollow Sections  Steel Pipe 80*80*4~12 Hollow Sections  Steel Pipe

　　280*280*8~25 Hollow Sections  Steel Pipe 60*60*4~12 Hollow Sections Steel Pipe

　　250*250*8~25 Hollow Sections  Steel Pipe 50*50*4~12 Hollow Sections  Steel Pipe

　　220*220*8~25 Hollow Sections  Steel Pipe 40*40*4~10 Hollow Sections  Steel Pipe

　　200*200*8~25 Hollow Sections  Steel Pipe 30*30*2~6 Hollow Sections  Steel Pipe

　　180*180*7~20 Hollow Sections  Steel Pipe 20*20*2~4 Hollow Sections  Steel Pipe

　　160*160*5~16 Hollow Sections  Steel Tubes 150*150*5~14 Hollow Sections  Steel Pipe

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