... ,high strength,great load-bearing capacity,being economical of materials,ventilation and light admission,modern fashion and ... chemical plants,oil refinery,iron and steel works,machine factories,paper mills,cement mills,medicine plants and foodstuff factories,for uses of ... Product StandardCHINA GB/T7001988Hot Galvanizing StandardCHINA GB/T139122002Symbol of Steel Grating1. Bearing bar pitches may be 12 ...