... GB/T6728 BS1387MaterialsQ195,Q215,Q235,Q345 #10 #20 #45 St37 St52 St42 St35 API155Product CategoryMetallurgy, Mineral & EnergyTechniqueWelded,ERW Cold Rolled,Hot RolledSurfaceBared ... system, Industrial water lines/plant piping, Vehicular chassis and frames, Idlers & belt conveyorsAgriculture and Irrigation,Scaffoldings, Electrical Cable conduits, Cooling towers, Antenna ...