... ,refineries,Sewerage Treatmentplants,Grain Silos,Chemical Plants and as Trafficable Drain grates and stairtreads.Bearing bar pitches maybe 12.5,15,25 ... ,paintFields of ApplicationPlatforms ,sidwalks,filter grates,ventilation grates,driling stages, ladder steps,ditch grates,fences,framedgrates,trash rack grates ,paint backing chambers…… plain steel ...