Carbon Square Steel Pipe Application: residence, gardens, villas, fence or protection. Grade:Q195 Q215 Q235/B Q345 SpecificationsDia: 30*30-700*900mm T: 3-40mm Material: Q235B, Q345B, 20#, STKR400,STKR490, ASTMA36,ASTM500 Standard: GB/T3094,JIS G3466,Normal SizeDiammT(mm)Dia (mm)T(mm)Dia (mm)T(mm)30*302-4120*1202-14250*2508-2540*402-4125*1252-14255*2558-2550*502-5130*1302-14258*2588-2560*602-5135 ...