Each cast iron covers are made of heat treatment in the Arts and heated in the solid state range, three-step process heat and cooling components. Because of different heating temperature, holding time and cooling rate, the matrix structure obtained is also different, therefore, cast iron production in addition to appropriate adjustments to the chemical composition in order to control common matrix structure, the heat treatment is to control and improve the tomb of body tissue to improve the performance of cast iron A change to way. Taigu County in Shanxi Province, Chang Inoue foundry is located in the hometown - gold Taigu treasure. 108 State Road, Taigu, Jinzhong City, Shanxi Province, Hu village Magang industrial park, east of long high-speed, high-speed north Tongyu Qi convenient transportation and accessible. Compare cast iron covers with similar resin covers: First, on the road with heavy traffic fall protection covers, generally will choose cast iron manhole covers, 40 tons load-bearing, but also to do some resin covers 25 tons of load fall protection covers manufacturers, but the price is relatively cast cheap. But the cast iron covers relatively safe. Secondly, the cast iron is stolen, big losses. There is a cast iron covers sometimes drove past will be a great voice, but relatively safe. Finally, if the resin is relatively much smaller. And like the green belt, sidewalk fall protection covers offer, it needs to withstand the pressure is not great, the cost of the big selection of cast iron. Taigu Chang in foundry was founded in 2006, is a new modern and dynamic enterprises. Since the construction and expansion of ongoing efforts fall protection covers Which is good, is to become a professional production of ductile iron covers enterprises with annual production capacity of 5,000 tons, is being expanded with an annual output of 10,000 tons. Which covers fall protection in foundry _ Chang (Certified) _ Yuncheng fall protection covers provided by Taigu 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.