Taigu Chang in foundry with you to explain what is heat-treated cast iron covers: cast iron covers heat treatment is the use of heating and cooling methods, regularly changing the iron core tissue Shanxi security covers the price, so it has to obtain tissue and the Shanxi security covers the corresponding performance to meet certain conditions of work needed Shanxi security covers casting, such as high strength, hardness, wear resistance, never good ductility and toughness. My Address: Taigu County, Shanxi Province, Hu Dong village town 108 National Road crossing. Taigu Chang in foundry teach you how to distinguish cast iron manhole covers and steel fiber covers: cast iron covers are cast iron or ductile metal covers raw materials. Basically hundred percent cast iron or ductile materials security covers wholesale Shanxi, and steel fiber covers are not. Taigu Chang in foundry tells you not cast iron covers steel fiber covers, which is a composite material covers, and although it seems a bit like a cast iron covers, there are also many properties close to places, but in fact from the real difference between the metal material covers it far. Shanxi security covers wholesale, Chang-year foundry (certified), Shanxi Taigu security covers provided by Chang in foundry. Taigu Chang in foundry (www.sxcnzz.com) is Jinzhong, machining leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Chang in foundry leadership with the staff warmly welcome all inquiries negotiations to create Chang foundry in a better future.