... Gray Iron: QT400, QT500, QT600,QT700 Test Machine: Spectrometer ; Microscope; Tensile tester,etc. 1). Our company established in 1972 which with 38 ... ; Annealing furnace; Full-automatic resin molding equipment5). Material:Ductile Iron: HT 250, HT300Gray Iron: QT400, QT500, QT600,QT700 For further information, please ...