mild steel tube weight 1.OD:20-530MM thickness:2.7-32mm 2.length:6m-12m 3.material:st37,st52,ss400,A36 Steel tube:1.round pipe: thickness:2.77-32mm, OD:21.3-530mm2.square pipe: thickness:4.0-20mm diameter:100-4003.rectangular pipe: thickness:4.0-20mm diameter:100*50-400*200mmmost them could galvanized.the zincoated:60g-270g/m2. steel tube