Gu Chang in the production process of ductile iron foundry covers: 1. the stringent requirements of chemical composition, carbon and silicon content of the original liquid iron requirements than gray cast iron is high, lower ductile iron manganese, phosphorus Shanxi covers ordering, sulfur content. 2. Make the ball handling, which was added to the iron ball agent. 3. Add inoculant were inoculation. 4. The liquid iron baked higher temperatures than gray cast iron, to compensate for the ball, bred loss treatment temperature of molten iron. 5. ductile illiquid, shrink large, and therefore requires a higher temperature and larger casting gating system size, rational application of Shanxi riser covers wholesale, cold iron, using solidification principles. Gu Chang foundry year round with you to share the advantages of cast iron covers: Use a circular cast iron covers, mainly on account of circular covers through its center of each diameter are the same length, so that if the covers are passing when the vehicle rolled on, because no matter how rolled on, it will be slightly wider than the diameter below the wellhead, the covers will not fall into the wellhead to go. Therefore, the actual total is rounded covers accounted for a large proportion. Want good quality ductile iron manhole cover, then select Gu Chang foundry in it! Shanxi covers procurement, Shanxi covers, Chang-year foundry provided by Gu Chang in foundry. Gu Chang-year foundry (www.sxcnzz.com) strong, credible, in Jinzhong machining industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chang and you work in the foundry into the brilliant, for a better future!