... platform,stair tread,well cover,trench cover,checkered gratings, grating ladder,fencesand handrail,etc for construction project, oil project, ... power plant, water plant, defense project, chemical factory and so on.The steel grating can be classified into Plain Style Steel ... ) Surface Treatment:Untreated, Painting or Hot dip Galvanizing6) Steel grating standards:A) China: YB/T4001-1998B) USA: ANSI/NAAMM ...