2. Compound steel grating is formed of any aype of ateel 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 special attention should be paid whrn choosing grating type