... treads galvanized and pvc coated factory steel gratingSteel grating is made by welding with flat steel and bars with certain ... the platform, corridor, bridge, well covers, stairs, fencing for petroleum, chemical, power plant, waste treatment plant, civil ... Supporting Flat SteelWidth X Thickness(mm) (mm)20×325×332×340×320×525×5130100G203/30/100G253/ ... /60/50G555/60/50G605/60/50 steel grating plate