Gu Chang-year foundry cast iron covers production process: cast iron covers the production process is essential for the heat treatment of ductile iron manhole covers offer to cast the solution in order to eliminate redundant load-bearing components of ductile iron manhole cover, so as to make use of the covers to reach Claim. Then the ball is, but adding nodulizer time is required, and we must see that the temperature of hot metal composition was also able to meet the process requirements, and then it poured. After casting we get just a cast-iron wood-type, there are some flaws, this is a time of need process full circle and polished. In addition, there are treated as well as the packaging process, the covers or other products coated with a layer of asphalt paint iron posts, and then packaging and storage. Gu Chang-year foundry mainly produces ductile covers, rain grate and so on! Ductile iron manhole covers is a ductile iron manhole covers product size, spherical graphite ductile get through ball and bred deal effectively improve the mechanical properties of cast iron, especially to improve the ductility and toughness, resulting in more than steel yet high strength. Address: Taigu County, State Road 108 towns Hu Dong village crossing. Sell ??ductile iron manhole covers, ductile iron manhole covers Shuozhou, 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!