Gu Chang-year foundry cast iron covers with you to share characteristics: As spheroidal graphite microstructure of ductile iron, weakening vibration capabilities, superior ductile cast iron manhole cover price, and therefore more conducive to reducing stress. Select ductile iron ductile iron is an important reason is that the cost is lower than steel. Ductile low cost make this material more popular, cast iron manhole covers efficient standards, but also reduces the cost of machining ductile iron. The strength and intensity of ductile cast are comparable. Ductile iron has a higher yield strength, yield strength minimum of 40k, while the yield strength of steel is only 36k. In most municipal applications, such as: water, salt water, steam, etc., ductile iron corrosion and oxidation resistance of more than steel. 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 covers cast iron 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. Ductile iron manhole covers, Chang-year foundry (certified), Jinzhong cast iron 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.