... 3. Easy installation & saving work time. Advantages of steel grid plank: light weight, strong intensity, big load ... 30, 38, 50, 76 and 100mm; of which 50 and 100mm arerecommended3) Advantages of steel grid planks: light weight, strong intensity, ... GradeASTM A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, ...