... attractive appearance.2) steel grating are widely used by various plants such as: electric power, petroleum, chemical industry, metallurgy industry, machinery industry, shipbuilding, harbor ... ,30,35,40,50mmCross bar pitch38,50,80,100mmmaterialLow carbon steel, stainless steel, aluminiumSurface treatmentUntreated, hot galvanized, paintedStandardsChina: YB/T 4001.1-2007USA ...