... 4,quick delivery constrution use hot dip galvanized square and rectangular steel pipe/SHS/RHS 1. Outer diameter:20*20 ... , automobile-making, railway construction, container support, furniture, decoration and steel structure construction.10. Capacity:8500 tons per month11. MOQ ... industries, for instance, steel construction project, machinery making and shipbuilding.structural square tube OD(mm)WT(mm)OD( ...