... Welded Steel Grating Material:Stainless steel,Hot-dipped Galvanzied,Alu Use:platform,ladders,floor drain,floor drain ISO9001 Serrated Steel Welded Grating Material:steel ... grating is made of low carbon steel plate,stainless steel plate,flat steel plate,etc Technique:steel ... Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, ...