Yangtze casting | [price] Shandong Ductile iron manhole covers | Weifang cast ductile iron manhole cover provided by the Yangtze River. We are Changyi City, Shandong Province, the Yangtze River Foundry (www.changjiangzhuzao.com) located at: Shandong Weifang professional: flexible ductile iron pipe ductile iron manhole covers are a product manufacturer of ductile iron manhole covers, ductile iron ball and get through inoculation spheroidal graphite effectively improve the mechanical properties of cast iron, especially to improve the ductility and toughness of ductile iron manhole covers, to obtain higher strength than the 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. Cast iron manhole cover milling ingredients that contain greater than 2% of the iron-carbon alloys, pig iron industry in general 2.5% carbon content - 4% ductile iron manhole covers and containing C, SI, Mn, S, P and other elements, is After blast furnace iron ore products. According to different forms of iron in the presence of carbon, can be divided into steelmaking pig iron, cast iron and ductile iron several. Precipitation of spherical graphite cast iron. Spheroidal graphite split effect on the metal substrate is smaller than the flake graphite cast iron, the strength of the matrix structure to achieve 70 to 90% strength ductile iron manhole price Shandong, tensile strength up to 120kgf/mm2, and has good toughness. Ductile iron is usually outside the chemical composition: carbon content of 3.6 to 3.8% silicon content of 2.0 to 3.0% manganese, phosphorus, sulfur and 1.5% of the total amount does not exceed the amount of rare earth magnesium nodulizer.