... other large-span and heavy loading condition. Surface Treatment:Steel grating untreated: Allowing quicker delivery to customers whom ... a hygienic and clean maintenance free bright finish..Advantage :Steel grating has a save material, strong loading capable, ... A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, painted, ...