... 3) steel grating may be applied to platform, floor, walkway, stair treads, trestle, fencing, drainage, trench cover, pit ... steel flat grates, 3. serrated steel flat grating TypeWelded steel grating, pressure-locked, socket-welding Steel flat size20 ... 100mmmaterialLow carbon steel, stainless steel, aluminumSurface treatmentUntreated, hot galvanized, paintedStandardsChina: YB/T 4001.1-2007USA: ANSI/NAAMM ...