gratings walkway,galvanized gratings,tread step,platform, Gratings of fixed platform,walkway,stairways and ladders,It's ... used product throughout all section of industry. this type of gratings is used extensively in power stations, refineries, sewerage treatment ... 1998 Material: ASTM(A36), BS4360(43A), GB700-88/Q235. Hot Galvanizing Standard: ASTM(A123), BS729, GB/T13912 Pre-engineered Steel Grating ...