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 after pouring directly with a spheroidal graphite cast iron crystals. Features: the performance indicators are better than ductile cast iron manhole covers size, cheaper than the price of malleable iron. Gu Chang foundry located in Shanxi Province, Taigu County towns Hu Dong village crossing State Road 108. Gu Chang outlined in ductile iron foundry with your anti-theft covers: 1, bolt hole blocking technique method. Bolts, nuts blocked the hook hole double manhole covers, but as long as both ends of the head and ductile iron manhole covers offer a bowed the wire, inserted into two grooves under the bolt head inside, you can open and take walk covers; 2, lock key method. 3, fork joint linkage method. Gu Chang foundry located in Inoue's hometown - Kim Gu treasure. Taigu Shanxi Jinzhong City, State Road 108, Hu village malleable ductile iron manhole covers industrial park, east of long high-speed, high-speed north Tongyu Qi convenient transportation and accessible. Size of manhole covers | Chang in foundry (certified) | Jincheng manhole 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.