Ductile iron manhole covers is a ductile cast iron covers sales of milling products, get spheroidal graphite ductile cast iron covers supply by ball milling and inoculation effectively improve the mechanical properties of cast iron, especially to improve the ductility and toughness, resulting higher strength than carbon 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 of the complex force, strength, toughness, wear require a higher parts. Ductile iron has been behind the rapid development of gray cast iron, cast iron material is widely used. The so-called "iron and steel", mainly referring to ductile iron. Ductile iron manhole cover as part of the urban road municipal facilities, living and working closely with the public ductile iron manhole covers chemical and physical characteristics of the use of cast ductile iron QT500-7, light weight, high strength, good toughness, corrosion resistance, fatigue resistance, cost appropriate, compared with the same size specifications gray cast iron covers, light 40% to 50% by weight milling of cast iron manhole covers manufacturers, high intensity compared to 40% to 50% higher than the old gray cast iron manhole covers. The old gray cast iron manhole covers brittle, easily broken. Now ductile iron and gray cast iron chemical composition of products to enhance corporate management is still an important task of the industry. Industry to actively guide companies to manage their own concerns, the industry should guide the quality of their importance to the development of industry production characteristics shown by the unbalanced nature of the decision on their own stalls should not be too large. Supply milling of cast iron manhole covers, Jinan milling cast iron manhole cover, provided by the Yangtze River Yangtze casting foundry. If you have any questions about this information or consultation, please contact us now! Our company name: Changyi City, Shandong Province, Changjiang foundry (www.changjiangzhuzao.com) Contact: Zhang, or click on "Commercial Union Service" direct dialogue with us!