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 supply 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. Ductile iron covers inspection: in strict accordance with test standards. 1. Appearance: No obvious casting defects, the pattern is clear, clear handwriting. 2. Roughness test: with special mold inspection covers flatness. Making a diameter of product size, depth 37mm tire with the size made by machining ductile iron manhole covers, manhole covers on the tire tool, you can not have a shake and sound, covers no more than the weight of the tire with ductile iron manhole covers, depth ( 37mm) with the gap at 3mm. 3. bearing loads using sampling methods. In the press do test pressure test, covers pressure 360KN 210KN confirm eligibility or batch. Gu Chang foundry specializing in the production of ductile iron manhole covers, are used in various places, welcome to buy! Supply of ductile iron manhole covers, Chang-year foundry, Liaoning ductile iron 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.