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Square Steel Tube Commodity Square Steel Tube Grade Q215 Q235 Q345 A53B Surface treatment Galvanized Standards ASME ANSI ASTM Thickness 0.5-10.0mm Outer Diameter 20*20-500*500 Technique Cold Rolled Packing Seaworthy packing,small sizepipes can be packed by steel strips into bundles,and large size pipes can be packed in bulk (or according to the customers’ requirement) Square Steel PipeGB/T3094-2006,6728-2002or ASTM A500 OR en10219 Material Q235,Q345,20# 30*30*3mm-100*100*16m 150*150*(5-20mm) 250*250*(5-25mm) 180*180*(5-18mm) 280*280*(5-25mm) 320*320*(5-25mm) 200*200*(5-20mm) 300*300*(5-25mm) 350*350*(5-25mm) 220*220*(5-20mm) 400*400*(5-25mm) 450*450*(5-25mm) No matter which kind of products we provide,we can make sure the high quality,the most suitable price and the best services. Based on your requirement, we can provide various of products under the specified standard.