... 85% of steel gratings are exported to the worldwide with perfect quality. There are many regular grating customers in ... black and hot dip Galvanizing and stainless grating flooring walkway, platform and steel structures, stair tread, well cover, trench cover, ... A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, ...