Gu Chang annual production of ductile foundry covers are widely used in major streets. Ductile iron: By adding a certain amount to the molten iron before pouring the ball ball handling agent, and add a small amount of inoculant to promote graphitization double ductile iron manhole covers, directly after casting spheroidal graphite cast iron has crystallized. Features: the performance indicators are better than the malleable ductile iron, malleable iron is cheaper than the price. Gu Chang foundry located in Shanxi Province, Taigu County towns Hu Dong village crossing State Road 108. Gu Chang-year development process foundry for ductile iron manhole cover you briefly: ductile iron is the 1950s developed a high-strength cast iron manhole covers size, and its overall performance is close to steel, is based on its excellent properties, some have been successfully used for the casting of complex force, strength, toughness, wear resistance demanding parts. Ductile iron has been behind the rapid development of gray cast iron, cast iron material is widely used. Gu Chang-year foundry mainly produces ductile iron covers, welcome to order! Ductile iron manhole cover price | Jinzhong ductile iron manhole covers | Chang in 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!