... iron QT400/18,QT450/10,QT500/7,QT600/3,QT700/2 Grey iron:HT150,HT200,HT250,D400,E600,F9 Ductile iron ... iron QT400/18,QT450/10,QT500/7,QT600/3,QT700/2 Grey iron:HT150,HT200,HT250,D400,E600,F9002)Loading weight ... of ductile iron and grey iron manhole covers and grates 2) We also produce drain cover using steel, stainless steel by ...