Gu Chang-year foundry mainly produces ductile covers, rain grate and so on! Ductile iron manhole covers is a product of, ductile iron spheroidal graphite cast iron manhole covers get quotes through ball and bred deal effectively improve the mechanical properties of cast iron manhole covers standards, in particular to improve the ductility and toughness, resulting in more than carbon also high strength steel. Address: Taigu County, State Road 108 towns Hu Dong village crossing. Gu Chang today to introduce in ductile iron foundry castings Feeding Process design principles: (1) small pieces or thin castings should be considered part of the external feeding, solidification shrinkage process requires external pressure to provide support; (2) Heavy Heavy or large parts of the piece castings or simply do not need feeding limited feeding; (3) the casting is not limited to the external feeding feeding; (4) Cold Heavy iron solidification rate can be adjusted at the hot spot and casting temperature gradient, its role in feeding the casting is conditional. Cast iron covers companies, Chang-year foundry (certified), Gansu cast iron covers are provided by Gu Chang in foundry. Gu Chang-year foundry (www.sxcnzz.com) is Jinzhong, machining leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chang-year leadership in the foundry staff warmly welcome all inquiries negotiations to create Chang foundry in a better future.