... and durable. Steel gratings can be classified into two styles by its bearing barstype,namely,plain style and serrated style,according ... plants,chemical plants,oil refinery,iron and steel works,machine factories,paper mills,cement mills,medicine plants and foodstuff ... GB/T7001988Hot Galvanizing StandardCHINA GB/T139122002Symbol of Steel Grating1. Bearing bar pitches may be 12.5 152030406080and 90mm,of ...