1.Compound steel grating is composed of checkered plate on sealed surface & steel grating with certain spanning capability.The checkered plates are normally in the thickness of 3mm, 4mm, 5mm or 6mm.
2. Compound steel grating is formed of any aype of steel grating and checkered plate in different thickness.The type of G253/30/100,G323/40/100 ,G323/60/100 are generally used as base and the checkered plate with 3mm is used as sealing plate.
3. As thermal stress may cause shape distortion after hot-dip galvanizing treatment especially choosing large spacing grating.so special attention should be paid whrn choosing grating type.