Ductile Iron: HT250, HT300. Gray Iron: QT400, QT500, QT600, QT700 Test Machine: Spectrometer; Microscope; ... gap broaching machine. 3) OEM service offered. 4) Producing casting Equipment; Electric furnace; Shot blasting machine; Annealing furnace; Full ... -automatic resin molding equipment. 5) Material: Ductile Iron: HT250, HT300.Gray Iron: QT400, QT500, QT600, QT700. For further information, ...