... ) Moulding Process: green sand casting, resin sand casting 2) Materials: gray iron, ductile iron3) Melting facilities: Electric Induction furnace ensures chemical ... and engineering machinery parts, pipe fittings, valve body, fire hydrant, Manhole cover etc. We also supplygray castings as per the customer's ... grade number including: QT400, QT500, QT600, QT700; HT250, HT300, TH350 Manhole Cover