... Material:steel grating is made of low carbon steel plate,stainless steel plate,flat steel plate,etc2.Technique:steel ... the balcony guardrail, highway, railway guardrail etc.Steel Grating Standardizations: CountriesNational Standards for GratingMaterialsGalvanizing Standards ... , A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, ...