... . material is grey iron and ductile iron SpecificationsGrey iron casting connection part;1. it's pipe fitting castings 2. material is ... /E, Auto CAD, Slid Work, CAXA, UG, CAD/CAM/CAEAdvantageAdvanced equipment and excellent R&D Team, Highly skilled manufacturing process, Strict ... higher strength and stiffness, economic and durable. Grey iron casting connection part