... shape,serrated-I shapeProcess: Steel grating mesh is made by Q235 low carbon steel welding load flat steel and bars with certain ... other large-span and heavy loading condition. Surface Treatment:Steel grating untreated: Allowing quicker delivery to customers whom ... A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, painted, ...