... spanning abilities, is very strong and safe for the floor support and elevated walkway. It can be used for ... metallurgy industry,machinery industry,shipbuilding, harbor,oceanographic engineering,building,paper mills,cement plant,medicine,spinning and weaving,foodstuff factory, ... .The steel gratings may be applied to make platform,floor,walkway,stair treads,trestle,fending,drainage trench cover,pit ...