... products enjoy the features of high strength ,light structure,high bearing,convenience for loading and other properties. ... for terminals, airport and other large-span and heavy loading condition. Surface Treatment:Steel grating untreated: Allowing quicker delivery ... A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, painted ...