Gu Chang-year foundry cast iron covers with you to share characteristics: As spheroidal graphite microstructure of ductile iron, in terms of reduced vibration capability, ductile than steel, 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 makes this material more popular Shanxi cast iron covers, cast iron manhole covers Shanxi higher efficiency 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 and other cast iron covers Shanxi quotes, ductile iron corrosion and oxidation resistance of more than steel. 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 product size diameter cast iron covers Shanxi diameter, depth 37mm tire with the size of the processing by machine, covers on the tire tool, you can not have a shake and sound, covers no more than mold, depth (37mm) with gap 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! Shanxi ductile iron manhole covers, Chang-year foundry (certified), cast iron covers are provided by Taigu Shanxi 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.