... 4Material GradeASTM A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating ... : AS1657-1985, Japan:JIS steel grating standard picture steel grating standard workshop picture steel grating standard loading into container steel grating standard factory door ...