Ductile ductile iron manhole cover is a product of, ductile spherical graphite obtained through ball and bred deal effectively improve the mechanical properties of cast iron, especially to improve the ductility and toughness, resulting in higher strength than steel. Ductile iron is the 1950s developed a high-strength cast iron materials, its overall performance is close to steel, is based on its excellent performance, has been successfully used to cast some complicated force, strength, toughness, resistance grindability demanding parts. Shanxi Taigu County Chang foundry is located in the hometown Inoue - Kim Gu treasure. Taigu Shanxi Jinzhong City, State Road 108, Hu village malleable Industrial Park, east of long high-speed design manhole covers North Tongyu Qi picture manhole covers high-speed transport facilities, accessible. Gu Chang-year foundry heavy manhole covers Advantages: (1) environmental protection, in line with national sustainable development strategies. This product uses new chemical synthesis of high quality materials, and the use of advanced technology and manufacturing. (2) theft, stolen completely solve the problem. This product is used in the material can not be recycled, no recycling value. (3) long life, greatly enhance product value. This product is a large payload, both the strength of cast iron manhole covers manhole covers, but also the relative toughness. (4) high-intensity pressure. Gu Chang-year foundry with reliable quality and good service, so our reputation known inside and outside the industry to make our products in short supply, the majority of users praise, we will continue the company under the guidance of the spirit of dedication to our customers provide better products. Size of manhole covers, manhole covers Yangquan, 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!