... 250, HT300 Gray Iron: QT400, QT500, QT600,QT700 Test Machine: Spectrometer ; Microscope; Tensile tester , ... furnace; Full-automatic resin molding equipment5). Material : Ductile Iron: HT 250, HT300 Gray Iron: QT400, QT500, QT600,QT700 For further information, please ...