... c.reliable manufacturer d.competitive price ZRHH GALVANIZED STEEL GRATING Steel Grating Standardizations: CountriesNational Standards for GratingMaterialsGalvanizing StandardsChinaYB/T 4001 ... .3, 32.5, 34.3, 35, 38.1, 40, 41.25, 60, 80mm etcUS standard: 19-w-4 ... A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted ...