... pressing and welding,surface treatment should be untreated,painted or hot dipped3.Characteristic:steel grating (1)high strength, (2)light ... , Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, painted, spray coating6Grating StylePlain / Smooth, ... 1987, Australia: AS1657-1992, Japan:JIS Galvanized and Painted Steel Grating with standard size