hollow section for building structure Quick details of hollow section pipe Square Tube Dimension: 20mm*20mm-1000*1000mm Rectangular Tube Dimension: 20mm*30mm-600mm*1000mm Thickness:2mm-35mm Length:6m-12m , or as per customers requirements Standards:DIN EN10210,EN10219,GB/T3094-2000,ASTM A500,JIS G 3466,GB/T6728-2002 Steel Grades:Q195, Q235, Q345(16Mn), STKR400/490, A500, ST37/44/52, S235, S275, S355, etc. Surface Treatment: anti-rust oil, black painting, galvanizing Packing: in bundles with steel strips or in bulk as per customer request Applications: Construction framework,  trestle, motorcar cassis,flight terminal framework, shipbuilding, automobile axle pipe, MRT and so on There are two sorts of square steel pipe: welded and also seamless.And rate for smooth square Pipe is frequently higher than that of welded type. Bonded square Pipe is constructed from steel plates or steel coils. Smooth square Pipe is made of round Pipes, which always offers the completed items high mechanical prosperities. Contact us:If you have any questions about product details or need service, please feel free to contact me. Contact name:Jenna Yan Tel:8603175501333 E-mail:Sales2@brsteel.org Skype:Steel-Jenna Whatsapp:+8613292790570 Linkedin:https://www.linkedin.com/in/jenna-yan-steel-pipe-trading-10843b16a/ Wechat:brsteelsales2