... weight,high strength,great load-bearing capacity,being economical of materials,ventilation and light admission,modern fashion and ... mills,cement mills,medicine plants and foodstuff factories,for uses of gangways,catwqys,and platforms for pump roons and ... AS16571985Steel Product StandardCHINA GB/T7001988Hot Galvanizing StandardCHINA GB/T139122002Symbol of Steel Grating1. Bearing bar pitches may be 12. ...