... capability c.reliable manufacturer d.competitive price ZRHH GALVANIZED STEEL GRATING Steel Grating Standardizations: CountriesNational Standards for GratingMaterialsGalvanizing StandardsChinaYB/T 4001.1-2007GB 700-88GB ... '' etc4Material GradeASTM A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray ...