... , GB1220-92 implementation.or as your requirements USES Galvanized steel grating used in alloys, building materials, power plants, ... industrial platform, ladder pedal, balustrade, channel floor, side road railway bridge, aerial platforms, drainage ditch cover, manhole covers, road ... A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc 5 Surface Treatment Black, self colour, hot dip ...